java swing v2.1 workshop solutions

8/14/2019 Java Swing v2.1 Workshop Solutions

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Java Swing

Workshop Solutions


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Java Swing: Workshop Solutions

Table of Contents

Workshop 2: Using Basic Components ........................................................................................i

Workshop 3: Using Swing Containers .......................................................................................vii

Workshop 4: Using Menus & ToolBars .....................................................................................xiv

Workshop 5: Using Common Dialogs .....................................................................................xxiii Workshop 6: Using Borders ...................................................................................................xxxiv

Workshop 7: Using Internal Frames..........................................................................................xlv

Workshop 8: Using a List Model................................................................................................lvii

2003 SkillBuilders Inc. V 2.1


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Java SWing: Workshop Solutions Page i

Workshop 2: Using Basic Components

SwingApp.java

// SwingApp.java

// After Basic Components exercise.

import java.awt.*;import java.awt.event.*;import javax.swing.*;

public class SwingApp {public static void main( String[] args ) {

new MainWindow(args);}

}

class MainWindow extends Frame {private ToolBar toolBar;private StatusBar statusBar = new StatusBar();private JTextArea textArea = new JTextArea();

// Constructorpublic MainWindow(String[] args) {

super("Studentsoft Super System");initLayout();

// A simple anonymous adapter to handle// windowClosing event.

addWindowListener( new WindowAdapter() {windowClosing( WindowEvent we ) {public voidquit(0);

}} );

// Set font of entire frame just before showing.FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) );

show();



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Java SWing: Workshop Solutions Page ii

&& args[0].toUpperCase().equals("LOGIN") ))

quit(0);

// Pop login dialog if "login" passed as 1st argument.// If user cancels or closes, close the application.if( args.length > 0

if( ! login()

showStatus( "Hello!" );}

OK, false if user clicks Cancel

n() {

ew boolean[1];

bOK);return bOK[0];

}

showStatus("Text cut to clipboard");}

// login() pops the LoginDialog, returns true if// user clicks// or closes.private boolean logi

// return true;boolean bOK[] = nbOK[0] = false;new LoginDialog(

// Private methodsprivate void cut() {

textArea.cut();

showStatus("Text copied to clipboard");}

showStatus("Text pasted from clipboard");}

private void copy() {textArea.copy();

private void paste() {

textArea.paste();

quit(int r etCode) {tCode);

return true;

private booleanSystem.exit(re

}

private void initLayout() {

ext("Enter / edit text here");

add( BorderLayout.SOUTH , statusBar );

toolBar = new ToolBar();

// Configure text areatextArea.setLineWrap( true );textArea.setWrapStyleWord( true );textArea.setToolTipT

// Configure framesetBounds( 100, 100, 500, 300 );add( BorderLayout.NORTH , toolBar );add( BorderLayout.CENTER, textArea );

}

private void showStatus( String te xt ) {



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Java SWing: Workshop Solutions Page iii

statusBar.showStatus( text );}

new JLabel( " ", JLabel.LEFT );

add( label, BorderLayout.SOUTH );}

// INNER CLASSES// Inner class for status bar

private class StatusBar extends Panel {private JLabel label =public StatusBar() {

setLayout( new BorderLayout() );setBackground( Color.lightGray );label.setForeground( Color.black );

xt ) {( " " + text );

doLayout();

} // end of StatusBar class

anelimplements ActionListener {

ut");ut");

oard");

public void showStatus( String telabel.setText

}

// Inner class for toolbarprivate class ToolBar extends P

public ToolBar() {JButton btnCut = new JButton("CbtnCut.setActionCommand("cbtnCut.setMnemonic('c');btnCut.setToolTipText("Cut to clipbbtnCut.addActionListener( this );

y");

board");btnCopy.addActionListener( this );

JButton btnCopy = new JButton("CopbtnCopy.setActionCommand("copy");

btnCopy.setMnemonic('o');btnCopy.setToolTipText("Copy to clip

ton("Paste ");

lipboard");

JButton btnPaste = new JButbtnPaste.setActionCommand("paste");btnPaste.setMnemonic('p');btnPaste.setToolTipText("Paste from c btnPaste.addActionListener( this );

Color.lightGray );

owLayout( FlowLayout.LEFT ));

add( btnPaste );

setBackground(setLayout( new Fladd( btnCut );add( btnCopy );

}

tons {

etActionCommand().equals("paste") )paste();

// Event handling for Cut, Copy and Paste butctionPerformed( ActionEvent ae )public void a

if( ae.getActionCommand().equals("cut") )cut();

else if( ae.getActionCommand().equals("copy") )copy();

else if( ae.g



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Java SWing: Workshop Solutions Page iv

}} // end of ToolBar class

ds Dialogimplements ActionListener {

d:", JLabel.RIGHT);

JButton btnCancel = new JButton("Cancel");

his, "User Login", true );I;

initLayout();

d.setFocusAccelerator()

// Login window

private class LoginDialog exten

boolean OKflag[];JLabel labelUID = new JLabel("User ID:", JLabel.RIGHT);JLabel labelPWD = new JLabel("PassworJTextField tfUID = new JTextField();JTextField tfPWD = new JTextField();JButton btnOK = new JButton("OK");

public LoginDialog( boolean[] OKflagI ) {super( MainWindow.tOKflag = OKflag

// Set up accelerators & mnemonics// For user ID field, use JTextFieltfUID.setFocusAccelerator( 'u' );labelUID.setDisplayedMnemonic( 'u' );

l.setLabelFor()

labelPWD.setDisplayedMnemonic( 'p' );

// For password field, use JLabelabelPWD.setLabelFor( tfPWD );

// Set up action commandsbtnOK.setActionCommand("ok");

btnCancel.setActionCommand("cancel");

// Button event handling performed by LoginDialog

dowEvent we ) {e.getWindow().dispose();

FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24)

btnOK.addActionListener( this );btnCancel.addActionListener( this );

// A simple anonymous adapter to handle// windowClosing event.

pter() {addWindowListener( new WindowAdablic void windowClosing( Winpu

w}

} );

// Set font of entire frame just before showing.

);

show();}

med( ActionEvent ae ) {d().equals("ok") )

= true;dispose();

public void actionPerforctionCommanif( ae.getA

OKflag[0]



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}

gbc = new GridBagConstraints();

setLayout( gbl );

private void initLayout() {GridBagLayout gbl = new GridBagLayout();GridBagConstraints

n dialogsetResizable( false ); // Make dialog fixed sizesetBounds( 100, 100, 300, 200 ); // Size & positio

ogin window

( labelUID, gbc ); // apply constraintsadd( labelUID );

// Add UID label to lgbc.gridx = 0;gbc.gridy = 0;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.EAST;gbc.fill = GridBagConstraints.HORIZONTAL;

gbl.setConstraints

ogin window

( labelPWD, gbc ); // apply constraints

// Add PWD label to lgbc.gridx = 0;gbc.gridy = 1;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.EAST;gbc.fill = GridBagConstraints.HORIZONTAL;gbl.setConstraintsadd( labelPWD );

to login window

nts( tfUID, gbc ); // apply constraints

// Add UID text fieldgbc.gridx = 2;gbc.gridy = 0;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;gbc.anchor = GridBagConstraints.WEST;

= GridBagConstraints.HORIZONTAL;gbc.fillgbl.setConstrai add( tfUID );

to login window

nts( tfPWD, gbc ); // apply constraints

// Add PWD text fieldgbc.gridx = 2;gbc.gridy = 1;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;gbc.anchor = GridBagConstraints.WEST;

= GridBagConstraints.HORIZONTAL;gbc.fillgbl.setConstrai add( tfPWD );



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// Add OK button to login window

nts( btnOK, gbc ); // apply constraintsadd( btnOK );

gbc.gridx = 1;gbc.gridy = 2;gbc.gridwidth = 1;gbc.gridheight = 1;

gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.CENTER;gbc.fill = GridBagConstraints.NONE;gbl.setConstrai

to login window

btnCancel, gbc ); // apply constraintsadd( btnCancel );

// Add Cancel buttongbc.gridx = 2;gbc.gridy = 2;gbc.gridwidth = 1;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;

gbc.anchor = GridBagConstraints.CENTER;gbc.fill = GridBagConstraints.NONE;gbl.setConstraints(

/ Put focus on ID fieldtfUID.requestFocus(); /

} // end of initLayout()

ss

// end of MainWindow class

isplay purposes; it hasexercise.

ponent c, Font f ) {

t(); i++)), f );

t(); i++)nt.getComponent(i), f );

c.setFont( f );}

}

} // end of LoginWindow cla }

// FontSetter is a convenience class. Its one static// method, setFont(), is used to change the font setting// for all components in a container. This is simply// to make the font bigger for d// no bearing on the class FontSetter {

// Change the font of the desired component ands and menus.// all its contained component

ompublic static void setFont( Cif( c instanceof JMenu ) {

JMenu mnu = (JMenu) c;for(int i = 0; i < mnu.getMenuComponentCoun

setFont( mnu.getMenuComponent(i}else if( c instanceof Container ) {

Container cont = (Container) c;for(int i = 0; i < cont.getComponentCoun

setFont( co}



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Java SWing: Workshop Solutions Page vii

Workshop 3: Using Swing Containers

SwingApp.Java

// SwingApp.java

// After Swing Containers exercise.




}

class MainWindow extends JFrame {private ToolBar toolBar ;private StatusBar statusBar = new StatusBar();private JTextArea textArea = new JTextArea();


super("Studentsoft Super System");initLayout();

// Turn off default closing mechanismTHING_ON_CLOSE );

ndowAdapter() {

setDefaultCloseOperation( JDialog.DO_NO

// A simple anonymous adapter to handle// windowClosing event.addWindowListener( new Wi

public void windowClosing( WindowEvent we ) {quit(0);

}} );




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Java SWing: Workshop Solutions Page ix

}

private void showStatus( String text ) {statusBar.showStatus( text );

}

// INNER CLASSESstatus bar

JPanel {", JLabel.LEFT );

erLayout() );

// Inner class forprivate class StatusBar extends

private JLabel label = new JLabel( "public StatusBar() {

setLayout( new BordsetBackground( Color.lightGray );label.setForeground( Color.black );add( label, BorderLayout.SOUTH );

}

public void showStatus( String text ) {

end of StatusBar class

label.setText( " " + text );

doLayout();}} //

// Inner class for toolbarprivate class ToolBar extends JPanel

implements ActionListener {

public ToolBar() {

to clipboard");

.getActionCommand().equals("copy") )

JButton btnCut = new JButton("Cut");btnCut.setActionCommand("cut");btnCut.setMnemonic('c');btnCut.setToolTipText("CutbtnCut.addActionListener( this );

JButton btnCopy = new JButton("Copy");btnCopy.setActionCommand("copy");btnCopy.setMnemonic('o');btnCopy.setToolTipText("Copy to clipboard");btnCopy.addActionListener( this );

JButton btnPaste = new JButton("Paste");btnPaste.setActionCommand("paste");btnPaste.setMnemonic('p');btnPaste.setToolTipText("Paste from clipboard");btnPaste.addActionListener( this );

setBackground( Color.lightGray );setLayout( new FlowLayout( FlowLayout.LEFT ));add( btnCut );add( btnCopy );add( btnPaste );

}

// Event handling for Cut, Copy and Paste buttonspublic void actionPerformed( ActionEvent ae ) {

if( ae.getActionCommand().equals("cut") )cut();

else if( ae



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copy();else if( ae.getActionCommand().equals("paste") )

end of ToolBar class

paste();}

} //

// Login windowinDialog extends JDialogprivate class Log


boolean OKflag[];new JLabel("User ID:", JLabel.RIGHT);

);

JLabel labelUID =JLabel labelPWD = new JLabel("Password:", JLabel.RIGHT);JTextField tfUID = new JTextField();JTextField tfPWD = new JTextField();JButton btnOK = new JButton("OK");JButton btnCancel = new JButton("Cancel"

public LoginDialog( boolean[] OKflagI ) { ue );

.setFocusAccelerator()

);

p' );

);

super( MainWindow.this, "User Login", trOKflag = OKflagI;initLayout();

// Set up accelerators & mnemonics// For user ID field, use JTextFieldtfUID.setFocusAccelerator( 'u' );labelUID.setDisplayedMnemonic( 'u'

// For password field, use JLabel.setLabelFor()labelPWD.setLabelFor( tfPWD );labelPWD.setDisplayedMnemonic( '

// Set up action commandsbtnOK.setActionCommand("ok"btnCancel.setActionCommand("cancel");

// Button event handling performed by LoginDialogbtnOK.addActionListener( this );btnCancel.addActionListener( this );

/*// A simple anonymous adapter to handle// windowClosing event.addWindowListener( new WindowAdapter() {

public void windowClosing( WindowEvent we ) {we.getWindow().dispose();

}} );

*/// Use default closing mechanism to close dialogsetDefaultCloseOperation( JDialog.DISPOSE_ON_CLOSE );

// Set font of entire frame just before showing.FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24)

);



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Java SWing: Workshop Solutions Page xi

show();}

public void actionPerformed( ActionEvent ae ) {if( ae.getActionCommand().equals("ok") )

OKflag[0] = true;dispose();

}

private void initLayout() {ew GridBagLayout();

();GridBagLayout gbl = nGridBagConstraints gbc = new GridBagConstraintsgetContentPane().setLayout( gbl );

setBounds( 100, 100, 300, 200 ); // Size & position dialogsetResizable( false ); // Make dialog fixed size

// Add UID label to login window

TAL;nstraints

gbc.gridx = 0;

gbc.gridy = 0;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.EAST;gbc.fill = GridBagConstraints.HORIZONgbl.setConstraints( labelUID, gbc ); // apply cogetContentPane().add( labelUID );

// Add PWD label to login windowgbc.gridx = 0;gbc.gridy = 1;gbc.gridwidth = 2;

gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.EAST;gbc.fill = GridBagConstraints.HORIZONTAL;gbl.setConstraints( labelPWD, gbc ); // apply constraintsgetContentPane().add( labelPWD );

// Add UID text field to login windowgbc.gridx = 2;gbc.gridy = 0;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;gbc.anchor = GridBagConstraints.WEST;gbc.fill = GridBagConstraints.HORIZONTAL;gbl.setConstraints( tfUID, gbc ); // apply constraintsgetContentPane().add( tfUID );

// Add PWD text field to login windowgbc.gridx = 2;gbc.gridy = 1;gbc.gridwidth = 2;gbc.gridheight = 1;



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Java SWing: Workshop Solutions Page xii

gbc.weightx = 1;gbc.weighty = 1;gbc.anchor = GridBagConstraints.WEST;

TAL;raints

gbc.fill = GridBagConstraints.HORIZONgbl.setConstraints( tfPWD, gbc ); // apply const

getContentPane().add( tfPWD );


BagConstraints.CENTER;

constraints

gbc.gridx = 1;gbc.gridy = 2;gbc.gridwidth = 1;gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = Gridgbc.fill = GridBagConstraints.NONE;gbl.setConstraints( btnOK, gbc ); // applygetContentPane().add( btnOK );

// Add Cancel button to login window

BagConstraints.CENTER;

gbc.gridx = 2;gbc.gridy = 2;gbc.gridwidth = 1;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;gbc.anchor = Gridgbc.fill = GridBagConstraints.NONE;gbl.setConstraints( btnCancel, gbc ); // apply constraintsgetContentPane().add( btnCancel );

tfUID.requestFocus(); // Put focus on ID field

ass FontSetter {t of the desired component and

{

tMenuComponentCount(); i++)

Container cont = (Container) c;


} // end of LoginWindow class

} // end of MainWindow class

// FontSetter is a convenience class. Its one static// method, setFont(), is used to change the font setting// for all components in a container. This is simply// to make the font bigger for display purposes; it has// no bearing on the exercise.

cl// Change the fon// all its contained components and menus.

nt f )public static void setFont( Component c, Foif( c instanceof JMenu ) {

JMenu mnu = (JMenu) c;gefor(int i = 0; i < mnu.

setFont( mnu.getMenuComponent(i), f );}

se if( c instanceof Container ) {el



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for(int i = 0; i < cont.getComponentCount(); i++)f );setFont( cont.getComponent(i),

}c.setFont( f );

}

}



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Java SWing: Workshop Solutions Page xiv

Workshop 4: Using Menus & ToolBars

SwingApp.java

// SwingApp.java

// After Menu & ToolBar exercise.

import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.*;



}

class MainWindow extends JFrame {private ToolBar toolBar ;private StatusBar statusBar = new StatusBar();private JTextArea textArea = new JTextArea();private Action actCut, actCopy, actPaste;


super("Studentsoft Super System");initActions();initLayout();

initMenu();

// Turn off default closing mechanismsetDefaultCloseOperation( JDialog.DO_NOTHING_ON_CLOSE );

apter to handle// A simple anonymous ad// windowClosing event.addWindowListener( new WindowAdapter() {

public voidquit(0);

windowClosing( WindowEvent we ) {



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}} );

FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) );// Set font of entire frame just before showing.

show();


quit(0);


if( ! login()



n() {

ew boolean[1];

bOK);return bOK[0];

}

showStatus("Text cut to clipboard");

showStatus("Text copied to clipboard");

showStatus("Text pasted from clipboard");

// login() pops the LoginDialog, returns true if// user clicks

// or closes.private boolean logi// return true;boolean bOK[] = nbOK[0] = false;new LoginDialog(


textArea.cut();

}


}

private void paste() {textArea.paste();

}

quit(int r etCode) {tCode);

return true;

:

private booleanSystem.exit(re

}

// Set up Action objectsprivate void initActions() {

// Action objects for cut, copy, pasteactCut = new AbstractAction("Cut") {

d actionPerformed(ActionEvent ae) {public voicut();

}};

actCut.putValue(Action.SHORT_DESCRIPTION,



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"Cut text to clipboard");

actCopy = new AbstractAction("Copy") {public void actionPerformed(ActionEvent ae) {

copy();

}};

actCopy.putValue(Action.SHORT_DESCRIPTION,"Copy text to clipboard");

actPaste = new AbstractAction("Paste") {public void actionPerformed(ActionEvent ae) {

paste();}

};actPaste.putValue(Action.SHORT_DESCRIPTION,

"Paste text from clipboard");}

private void initLayout() {toolBar = new ToolBar();

// Configure text areatextArea.setLineWrap( true );textArea.setWrapStyleWord( true );textArea.setToolTipText("Enter / edit text here");

// Configure framesetBounds( 100, 100, 500, 300 );getContentPane().add( BorderLayout.NORTH , toolBar );getContentPane().add( BorderLayout.CENTER, textArea );getContentPane().add( BorderLayout.SOUTH , statusBar );

ner for textArea to react when// Create caret liste// selection changestextArea.addCaretListener( new CaretListener() {

public void caretUpdate(CaretEvent e) {.getSelectionStart() !=boolean isSelection = textArea

textArea.getSelectionEnd();actCut.setEnabled(isSelection);actCopy.setEnabled(isSelection);

}});

}

private void initMenu() {// Local inner class for handling menu itemsclass MenuHandler implements ActionListener {

public void actionPerformed( ActionEvent ae ) {

ileNew") )if( ae.getActionCommand().equals("FshowStatus("New file created");

.equals("FileOpen") )else if( ae.getActionCommand()showStatus("File opened");

).equals("FileSave") )else if( ae.getActionCommand(showStatus("File saved");

else if( ae.getActionCommand().equals("FileExit") )



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Java SWing: Workshop Solutions Page xvii

quit( 0 );

// Toggle toolbar visibilityelse if( ae.getActionCommand().equals("OptionsToolbar") ) {

// Get source, cast it as JCheckBoxMenuItem:

JCheckBoxMenuItem cbmi = (JCheckBoxMenuItem)ae.getSource();

toolBar.setVisible( cbmi.isSelected() );getContentPane().doLayout();

}}

}

// Instantiate handlerMenuHandler mh = new MenuHandler();

// Create menu barJMenuBar mb = new JMenuBar();

// Assemble File menu:JMenu mFile = new JMenu("File");mFile.setMnemonic('f');

// File | NewJMenuItem miFNew = new JMenuItemmiFNew.addActionListener( mh );

("New", 'n');

miFNew.setActionCommand("FileNew");miFNew.setAccelerator(

KeyStroke.getKeySmFile.add(miFNew);

troke(KeyEvent.VK_N, Event.CTRL_MASK, true ));

// File | OpenJMenuItem miFOpen = new JMenuItem("Open", 'o');

miFOpen.addActionListener( mh ); ("FileOpen");miFOpen.setActionCommandmiFOpen.setAccelerator(

KeyStroke.getKeyStmFile.add(miFOpen);

roke(KeyEvent.VK_O, Event.CTRL_MASK, true ));

// File | Save("Save", 's');JMenuItem miFSave = new JMenuItem

miFSave.addActionListener( mh );("FileSave");miFSave.setActionCommand

miFSave.setAccelerator(roke(KeyEvent.VK_S, Event.CTRL_MASK, true ));KeyStroke.getKeySt

mFile.add(miFSave);

// SeparatormFile.addSeparator();

// File | Exit("Exit", 'x');JMenuItem miFExit = new JMenuItem

miFExit.addActionListener( mh );mand("FileExit");miFExit.setActionCom

mFile.add(miFExit);

menu to menu bar// Attach Filemb.add(mFile);



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// Create Edit menu from Action objectsJMenu mEdit = new JMenu("Edit");mEdit.setMnemonic('e');

Action actions[] = { actCut, actCopy, actPaste };int mnemonics[] = { 'c', 'o', 'p' };for( int i = 0; i < actions.length; i++ ) {

JMenuItem mi = mEdit.add(actions[i]);mi.setMnemonic( mnemonics[i]);String s =

actions[i].getValue( Action.SHORT_DESCRIPTION ).toString();mi.setToolTipText( s );

}

mb.add(mEdit);

// Create Options menuJMenu mOptions = new JMenu("Options");mOptions.setMnemonic('o');

// Options | ToolbarJMenuItem miOToolbar = new JCmiOToolbar.setMnemonic('t');

heckBoxMenuItem("Toolbar", true);

miOToolbar.addActionListener( mh );miOToolbar.setActionCommand("OptionsToolbar");mOptions.add(miOToolbar);

mb.add(mOptions);

// Attach menubar to frame.

getRootPane().setJMenuBar(mb);

}

ext ) {private void showStatus( String tstatusBar.showStatus( text );

}

// INNER CLASSES// Inner class for status barprivate class StatusBar extends JPanel {

= new JLabel( " ", JLabel.LEFT );private JLabel labelpublic StatusBar() {

setLayout( new BorderLayout() );setBackground( Color.lightGray );

;label.setForeground( Color.black )add( label, BorderLayout.SOUTH );

}

ext ) {public void showStatus( String tt( " " + text );label.setTex

doLayout();}

} // end of StatusBar class



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Java SWing: Workshop Solutions Page xix

// Inner class for toolbar// private class ToolBar extends JPanel

private class ToolBar extends JToolBarimplements ActionListener {

public ToolBar() {// Add actions to the toolbar to create buttons.Action actions[] = { actCut, actCopy, actPaste };for( int i = 0; i < actions.length; i++ ) {

JButton btn = add(actions[i]);String s =

actions[i].getValue( Action.SHORT_DESCRIPTION).toString();

btn.setToolTipText( s );}

/*JButton btnCut = new JButton("Cut");btnCut.setActionCommand("cut");

btnCut.setMnemonic('c');btnCut.setToolTipText("Cut to clipboard");btnCut.addActionListener( this );

JButton btnCopy = new JButton("Copy");btnCopy.setActionCommand("btnCopy.setMnemonic('o');

copy");

btnCopy.setToolTipText("Copy to clipboard");btnCopy.addActionListener( this );

e");JButton btnPaste = new JButton("PastbtnPaste.setActionCommand("paste");btnPaste.setMnemonic('p');btnPaste.setToolTipText("Paste from

btnPaste.addActionListener( this );

clipboard");

setBackground( Color.lightGray );setLayout( new FlowLayout( FlowLayout.LEFT ));add( btnCut );add( btnCopy );add( btnPaste );

*/}

s// Event handling for Cut, Copy and Paste button{public void actionPerformed( ActionEvent ae )

ActionCommand().equals("cut") )if( ae.getcut();

.getActionCommand().equals("copy") )else if( aecopy();

getActionCommand().equals("paste") )else if( ae.paste();


// Login windownds JDialogprivate class LoginDialog exte




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boolean OKflag[];JLabel labelUID = new JLabel("User ID:", JLabel.RIGHT);JLabel labelPWD = new JLabel("Password:", JLabel.RIGHT);JTextField tfUID = new JTextField();

JTextField tfPWD = new JTextField();JButton btnOK = new JButton("OK");JButton btnCancel = new JButton("Cancel");

public LoginDialog( boolean[] OKflagI ) {super( MainWindow.this, "User Login", true );OKflag = OKflagI;initLayout();

// Set up accelerators & mnemonics// For user ID field, use JTextField.setFocusAccelerator()tfUID.setFocusAccelerator( 'u' );labelUID.setDisplayedMnemonic( 'u' );

// For password field, use JLabel.setLabelFor()labelPWD.setLabelFor( tfPWD );labelPWD.setDisplayedMnemonic( 'p' );

// Set up action commandsbtnOK.setActionCommand("ok");btnCancel.setActionCommand("cancel");


/*


public void windowClosing( Wiwe.getWindow().dispose();

ndowEvent we ) {

}} );



);

show();}

) {public void actionPerformed( ActionEvent aend().equals("ok") )if( ae.getActionComma

] = true;OKflag[0dispose();

}




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Java SWing: Workshop Solutions Page xxi

GridBagLayout gbl = new GridBagLayout();GridBagConstraints gbc = new GridBagConstraints();getContentPane().setLayout( gbl );

setBounds( 100, 100, 300, 200 ); // Size & position dialog

setResizable( false ); // Make dialog fixed size

// Add UID label to login windowgbc.gridx = 0;gbc.gridy = 0;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.EAST;gbc.fill = GridBagConstraints.HORIZONTAL;gbl.setConstraints( labelUID, gbc ); // apply constraintsgetContentPane().add( labelUID );

// Add PWD label to login windowgbc.gridx = 0;gbc.gridy = 1;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.EAST;gbc.fill = GridBagConstraints.HORIZONTAL;gbl.setConstraints( labelPWD, gbcgetContentPane().add( labelPWD );

); // apply constraints

// Add UID text field to login windowgbc.gridx = 2;

gbc.gridy = 0;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;gbc.anchor = GridBagConstraints.WEST;gbc.fill = GridBagConstraints.HORIZONTAL;

); // apply constraintsgbl.setConstraints( tfUID, gbcgetContentPane().add( tfUID );

d to login window// Add PWD text fielgbc.gridx = 2;gbc.gridy = 1;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;gbc.anchor = GridBagConstraints.WEST;gbc.fill = GridBagConstraints.HORIZONTAL;

); // apply constraintsgbl.setConstraints( tfPWD, gbcgetContentPane().add( tfPWD );

login window// Add OK button togbc.gridx = 1;gbc.gridy = 2;



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gbc.gridwidth = 1;gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.CENTER;

gbc.fill = GridBagConstraints.NONE;gbl.setConstraints( btnOK, gbc ); // apply constraintsgetContentPane().add( btnOK );

// Add Cancel button to login windowgbc.gridx = 2;gbc.gridy = 2;gbc.gridwidth = 1;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;gbc.anchor = GridBagConstraints.CENTER;gbc.fill = GridBagConstraints.NONE;gbl.setConstraints( btnCancel, gbc ); // apply constraints

getContentPane().add( btnCancel );





// FontSetter is a convenience class. Its one static// method, setFont(), is used to change the font setting

// for all components in a container. This is simply display purposes; it has// to make the font bigger for// no bearing on the exercise.

class FontSetter {and// Change the font of the desired component

// all its contained components and menus.mponent c, Font f ) {public static void setFont( Co

if( c instanceof JMenu ) {JMenu mnu = (JMenu) c;

nt(); i++)for(int i = 0; i < mnu.getMenuComponentCousetFont( mnu.getMenuComponent(i), f );

}else if( c instanceof Container ) {

Container cont = (Container) c;nt(); i++)for(int i = 0; i < cont.getComponentCou

setFont( cont.getComponent(i), f );}c.setFont( f );

}}



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Workshop 5: Using Common Dialogs

SwingApp.java

// SwingApp.java

// After Dialogs exercise.

import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.*;import javax.swing.text.JTextComponent;


new MainWindow(args);

}}

class MainWindow extends JFrame {private ToolBar toolBar ;private StatusBar statusBar = new StatusBar();private JTextArea textArea = new JTextArea();private Action actCut, actCopy, actPaste;


super("Studentsoft Super System");initActions();

initLayout()initMenu(); ;



windowClosing( WindowEvent we ) {public void



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quit(0);

} );

FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) );

}


show();


quit(0);


if( ! login()



n() {

ew boolean[1];

bOK);return bOK[0];

}


// login() pops the LoginDialog, returns true if

// user clicks// or closes.private boolean logi



textArea.cut();

}

private void copy() {



g Application",

.YES_OPTION ) {tCode);

urn true;

return false;}

textArea.copy();

}


}

private boolean quit(int retCode) {onfirmDialog( this,int intAnsw = JOptionPane.showC

"Are you sure you want to exit?", "ExitinON );JOptionPane.YES_NO_OPTI

OptionPaneif( intAnsw == JSystem.exit(re ret

}else



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Java SWing: Workshop Solutions Page xxvi


toolBar = new ToolBar();

textArea.setToolTipText("Enter / edit text here");

getContentPane().add( BorderLayout.SOUTH , statusBar );


// Configure text areatextArea.setLineWrap( true );textArea.setWrapStyleWord( true );

// Configure framesetBounds( 100, 100, 500, 300 );getContentPane().add( BorderLayout.NORTH , toolBar );getContentPane().add( BorderLayout.CENTER, textArea );

er for textArea to react when

() {

getSelectionStart() !=

actCopy.setEnabled(isSelection);

});

// Create caret listen

// selection changestextArea.addCaretListener( new CaretListenerpublic void caretUpdate(CaretEvent e) {

boolean isSelection = textArea.textArea.getSelectionEnd();

actCut.setEnabled(isSelection);

}

}



if( ae.getActionCommand().equals("Fi leNew") )

als("FileOpen") )

ActionCommand().equals("FileExit") )

lbar") ) {

m)

ected() );getContentPane().doLayout();

nd().equals("OptionsFont") )chooseFont(textArea);

showStatus("New file created")ActionCommand().equ

;else if( ae.get

// showStatus("File opened");openFile();

else if( ae.getActionCommand().equals("FileSave") )"File saved");showStatus(

else if( ae.get quit( 0 );

// Toggle toolbar visibilityelse if( ae.getActionCommand().equals("OptionsToo

// Get source, cast it as JCheckBoxMenuItem:JCheckBoxMenuItem cbmi = (JCheckBoxMenuIte

ae.getSource();toolBar.setVisible( cbmi.isSel

}

// Set font on text areaelse if( ae.getActionComma



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Java SWing: Workshop Solutions Page xxvii

}}

MenuHandler mh = new MenuHandler();

JMenuBar mb = new JMenuBar();

File");mFile.setMnemonic('f');

"New", 'n');

"FileNew");

roke(KeyEvent.VK_N, Event.CTRL_MASK, true ));

mFile.add(miFNew);

"Open", 'o');

oke(KeyEvent.VK_O, Event.CTRL_MASK, true ));mFile.add(miFOpen);

"Save", 's');

oke(KeyEvent.VK_S, Event.CTRL_MASK, true ));mFile.add(miFSave);

// Instantiate handler

// Create menu bar

// Assemble File menu:JMenu mFile = new JMenu("

// File | NewJMenuItem miFNew = new JMenuItem(miFNew.addActionListener( mh );miFNew.setActionCommand(miFNew.setAccelerator(

KeyStroke.getKeySt

// File | OpenJMenuItem miFOpen = new JMenuItem(miFOpen.addActionListener( mh );miFOpen.setActionCommand("FileOpen");miFOpen.setAccelerator(

KeyStroke.getKeyStr

// File | SaveJMenuItem miFSave = new JMenuItem(miFSave.addActionListener( mh );miFSave.setActionCommand("FileSave");

or(miFSave.setAcceleratKeyStroke.getKeyStr

// Separatoror();

", 'x');

and("FileExit");

mFile.addSeparat

// File | ExitJMenuItem miFExit = new JMenuItem("Exit

tener( mh );miFExit.addActionLismiFExit.setActionComm mFile.add(miFExit);

// Attach File m enu to menu barmb.add(mFile);

Action ob jectsEdit");

// Create Edit menu fromJMenu mEdit = new JMenu(" mEdit.setMnemonic('e');

e };

{[i]);

Action actions[] = { actCut, actCopy, actPastint mnemonics[] = { 'c', 'o', 'p' };

; i++ )for( int i = 0; i < actions.lengthJMenuItem mi = mEdit.add(actions



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Java SWing: Workshop Solutions Page xxviii

mi.setMnemonic( mnemonics[i]);

tion.SHORT_DESCRIPTION ).toString();mi.setToolTipText( s );

}

String s =actions[i].getValue( Ac

mb.add(mEdit);

Options");mOptions.setMnemonic('o');

eckBoxMenuItem("Toolbar", true);

("OptionsToolbar");

mOptions.add(miOToolbar);

// Create Options menuJMenu mOptions = new JMenu("

// Options | ToolbarJMenuItem miOToolbar = new JChmiOToolbar.setMnemonic('t');miOToolbar.addActionListener( mh );miOToolbar.setActionCommand

em to Options menu

"Text Font...", 'f');

("OptionsFont");mOptions.add(miOFont);

getRootPane().setJMenuBar(mb);

// Add separator & Font itmOptions.addSeparator();JMenuItem miOFont = new JMenuItem(miOFont.addActionListenmiOFont.setActionCommand

er( mh );

mb.add(mOptions);

// Attach menubar to frame.

}

private void showStatus( String te xt ) {statusBar.showStatus( text );

", JLabel.LEFT );

add( label_, BorderLayout.SOUTH );

}

// INNER CLASSES// Inner class for status bar

extends JPanel {private class StatusBarprivate JLabel label_ = new JLabel( "public StatusBar() {

setLayout( new BorderLayout() );setBackground( Color.lightGray );label_.setForeground( Color.black );

}

wStatus( String tex t ) {t( " " + text );

public void sholabel_.setTex doLayout();

}} // end of StatusBar class

// Inner class for toolbar

// private class ToolBar extends JPanel



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Java SWing: Workshop Solutions Page xxix


e };i++ ) {

= add(actions[i]);

ctions[i].getValue( Action.SHORT_DESCRIPTION


public ToolBar() {// Add actions to the toolbar to create buttons.

Action actions[] = { actCut, actCopy, actPastfor( int i = 0; i < actions.length;

JButton btnString s =

a).toString();

/*JButton btnCut = new JButton("Cut");btnCut.setActionCommand("cut");btnCut.setMnemonic('c');btnCut.setToolTipText("Cut to clipboard");

btnCut.addActionListener( this );

JButton btnCopy = new JButton("Copy");btnCopy.setActionCommand("copy");btnCopy.setMnemonic('o');btnCopy.setToolTipText("Copy to clibtnCopy.addActionListener( this );

pboard");


setBackground( Color.lightGray );FlowLayout( FlowLayout.LEFT ));setLayout( newadd( btnCut );add( btnCopy );add( btnPaste );

*/}






// Login windownds JDialogprivate class LoginDialog exte


boolean OKflag[];



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Java SWing: Workshop Solutions Page xxx

JLabel labelUID = new JLabel("User ID:", JLabel.RIGHT);JLabel labelPWD = new JLabel("Password:", JLabel.RIGHT);JTextField tfUID = new JTextField();JTextField tfPWD = new JTextField();JButton btnOK = new JButton("OK");

JButton btnCancel = new JButton("Cancel");


// Set up accelerators & mnemonics// For user ID field, use JTextField.setFocusAccelerator()tfUID.setFocusAccelerator( 'u' );labelUID.setDisplayedMnemonic( 'u' );

// For password field, use JLabel.setLabelFor()labelPWD.setLabelFor( tfPWD );

labelPWD.setDisplayedMnemonic( 'p' );



/*// A simple anonymous adapter to handle// windowClosing event.

addWindowListener( new WindowAdapter() { ndowEvent we ) {public void windowClosing( Wiwe.getWindow().dispose();

}} );



);

show();}

{public void actionPerformed( ActionEvent ae )ok") ) {if( ae.getActionCommand().equals("

// Check if User ID is correctif( ! tfUID.getText().trim().toUpperCase().equals("STUDENT")

) {JOptionPane.showMessageDialog( null,

gain.", "Invalid Login","Sorry, invalid user ID.\nTry aESSAGE );JOptionPane.WARNING_M

tfUID.requestFocus();



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Java SWing: Workshop Solutions Page xxxi

tfUID.selectAll();return;

}

// Check if password is correct

if( ! tfPWD.getText().trim().toUpperCase().equals("LEARN") ){

JOptionPane.showMessageDialog( null,"Sorry, invalid password.\nTry again.", "Invalid Login",JOptionPane.WARNING_MESSAGE );

tfPWD.requestFocus();tfPWD.selectAll();return;

}

OKflag[0] = true;}dispose();

}

private void initLayout() {GridBagLayout gbl = new GridBagLayout();GridBagConstraints gbc = new GridBagConstraints();getContentPane().setLayout( gbl );


// Add UID label to login windowgbc.gridx = 0;gbc.gridy = 0;gbc.gridwidth = 2;gbc.gridheight = 1;

gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.EAST;gbc.fill = GridBagConstraints.HORIZONTAL;

); // apply constraintsgbl.setConstraints( labelUID, gbcgetContentPane().add( labelUID );

login window// Add PWD label togbc.gridx = 0;gbc.gridy = 1;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.EAST;gbc.fill = GridBagConstraints.HORIZONTAL;

); // apply constraintsgbl.setConstraints( labelPWD, gbcgetContentPane().add( labelPWD );

d to login window// Add UID text fielgbc.gridx = 2;gbc.gridy = 0;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 1;



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Java SWing: Workshop Solutions Page xxxii

gbc.weighty = 1;gbc.anchor = GridBagConstraints.WEST;gbc.fill = GridBagConstraints.HORIZONTAL;gbl.setConstraints( tfUID, gbc ); // apply constraintsgetContentPane().add( tfUID );

// Add PWD text field to login windowgbc.gridx = 2;gbc.gridy = 1;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;gbc.anchor = GridBagConstraints.WEST;gbc.fill = GridBagConstraints.HORIZONTAL;gbl.setConstraints( tfPWD, gbc ); // apply constraintsgetContentPane().add( tfPWD );


gbc.gridx = 1;gbc.gridy = 2;gbc.gridwidth = 1;gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.CENTER;gbc.fill = GridBagConstraints.NONE;gbl.setConstraints( btnOK, gbc ); // apply constraintsgetContentPane().add( btnOK );

// Add Cancel button to login windowgbc.gridx = 2;gbc.gridy = 2;

gbc.gridwidth = 1;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;gbc.anchor = GridBagConstraints.CENTER;gbc.fill = GridBagConstraints.NONE;gbl.setConstraints( btnCancel, gbc ); // apply constraintsgetContentPane().add( btnCancel );




FontSetter is a convenience class. Its one staticg

// end of MainWindow class}

//// method, setFont(), is used to change the font settin// for all components in a container. This is simply

s// to make the font bigger for display purposes; it ha// no bearing on the exercise.



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Java SWing: Workshop Solutions Page xxxiii

class FontSetter {// Change the font of the desired component and

ned components and menus.{

tMenuComponentCount(); i++)omponent(i), f );

Container cont = (Container) c;ntCount(); i++)f );

// all its contaipublic static void setFont( Component c, Font f )

if( c instanceof JMenu ) {

JMenu mnu = (JMenu) c;for(int i = 0; i < mnu.ge

setFont( mnu.getMenuC}else if( c instanceof Container ) {

for(int i = 0; i < cont.getComponesetFont( cont.getComponent(i),

}c.setFont( f );

}}



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Workshop 6: Using Borders

SwingApp.java

// SwingApp.java

// After Borders exercise.

import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.*;import javax.swing.event.*;import javax.swing.text.JTextComponent;

public class SwingApp {

public static void main( String[] args ) {new MainWindow(args);}

}

class MainWindow extends JFrame {private ToolBar toolBar ;private StatusBar statusBar = new StatusBar();private JTextArea textArea = new JTextAreprivate Action actCut, actCopy, actPaste;

a();


oft Super System");super("StudentsinitActions();initLayout();initMenu();


apter to handle// A simple anonymous ad// windowClosing event.



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Java SWing: Workshop Solutions Page xxxv

addWindowListener( new WindowAdapter() {public void windowClosing( WindowEvent we ) {

quit(0);

} );


}


show();


quit(0);


if( ! login()



n() {

ew boolean[1];

bOK);return bOK[0];

showStatus("Text cut to clipboard");}



g Application",


urn true;

return false;}



}


textArea.cut();


}


}




}else



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Java SWing: Workshop Solutions Page xxxvi

private boolean openFile() {JFileChooser fc = new JFileChooser();int intAnsw = fc.showOpenDialog(this);

leChooser.CANCEL_OPTION )return false;

// If user clicked cancel, return falseif( intAnsw == JFi

pened file: " + fc.getSelectedFile() );return true;

}

showStatus( "O

private boolean chooseFont( JTextComponent tc ) {// Compose array of font names.String fonts[] =

GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();

Font curFont = tc.getFont(); // Get current settingObject oChoice = JOptionPane.showInputDialog( this,

"Choose a font:", "Choose Font", Jnull, fonts, curFont.getName() );

OptionPane.QUESTION_MESSAGE,

if( oChoice == null )return false;

tring) oChoice, curFont.getStyle(),tc.setFont( new Font( (ScurFont.getSize() ));

tc.repaint();

}

return true;


e:// Action objects for cut, copy, pastactCut = new AbstractAction("Cut") {


}};

T_DESCRIPTION,actCut.putValue(Action.SHOR"Cut text to clipboard");

actCopy = new AbstractAction("Copy") {actionPerformed(ActionEvent ae) {public void

copy();}

};T_DESCRIPTION,actCopy.putValue(Action.SHOR

"Copy text to clipboard");

actPaste = new AbstractAction("Paste") {actionPerformed(ActionEvent ae) {public void

paste();}



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Java SWing: Workshop Solutions Page xxxvii

};actPaste.putValue(Action.SHORT_DESCRIPTION,


private void initLayout() {toolBar = new ToolBar();

// Configure text areatextArea.setLineWrap( true );textArea.setWrapStyleWord( true );textArea.setToolTipText("Enter / edit text here");textArea.setBorder( BorderFactory.createTitledBorder( "Workspace"

));

// Configure framesetBounds( 100, 100, 500, 300 );getContentPane().add( BorderLayout.NORTH , toolBar );getContentPane().add( BorderLayout.CENTER, textArea );

getContentPane().add( BorderLayout.SOUTH , statusBar );

// Create caret listener for textArea to react when// selection changestextArea.addCaretListener( new CaretListene

public void caretUpdate(CaretEvent e) {r() {

boolean isSelection = textArea.getSelectionStart() !=textArea.getSelectionEnd();

actCut.setEnabled(isSelection);actCopy.setEnabled(isSelection);

}});

}



ileNew") )if( ae.getActionCommand().equals("FshowStatus("New file created");

uals("FileOpen") )else if( ae.getActionCommand().eqs("File opened");// showStatu

openFile();).equals("FileSave") )else if( ae.getActionCommand(

showStatus("File saved");tActionCommand().equals("FileExit") )else if( ae.ge

quit( 0 );

// Toggle toolbar visibilityolbar") ) {else if( ae.getActionCommand().equals("OptionsTo

// Get source, cast it as JCheckBoxMenuItem:JCheckBoxMenuItem cbmi = (JCheckBoxMenuItem)

ae.getSource();lected() );toolBar.setVisible( cbmi.isSe

getContentPane().doLayout();}



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Java SWing: Workshop Solutions Page xxxviii

// Set font on text areaelse if( ae.getActionCommand().equals("OptionsFont") )

chooseFont(textArea);

}

}


// Create menu barJMenuBar mb = new JMenuBar();

// Assemble File menu:JMenu mFile = new JMenu("File");mFile.setMnemonic('f');

// File | NewJMenuItem miFNew = new JMenuItem("New", 'n');

miFNew.addActionListener( mh );miFNew.setActionCommand("FileNew");miFNew.setAccelerator(

KeyStroke.getKeyStroke(KeyEvent.VK_N, Event.CTRL_MASK, true ));mFile.add(miFNew);

// File | OpenJMenuItem miFOpen = new JMenuItem("Open", 'o');miFOpen.addActionListener( mh );miFOpen.setActionCommand("FileOpen");miFOpen.setAccelerator(

KeyStroke.getKeyStroke(KeyEvent.VK_O, Event.CTRL_MASK, true ));mFile.add(miFOpen);

// File | Save ("Save", 's');JMenuItem miFSave = new JMenuItemmiFSave.addActionListener( mh );miFSave.setActionCommand("FileSave");miFSave.setAccelerator(

roke(KeyEvent.VK_S, Event.CTRL_MASK, true ));KeyStroke.getKeyStmFile.add(miFSave);

// SeparatormFile.addSeparator();

// File | Exit("Exit", 'x');JMenuItem miFExit = new JMenuItem

miFExit.addActionListener( mh );mand("FileExit");miFExit.setActionCom

mFile.add(miFExit);

menu to menu bar// Attach Filemb.add(mFile);

bjects// Create Edit menu from Action o"Edit");JMenu mEdit = new JMenu(

mEdit.setMnemonic('e');



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Java SWing: Workshop Solutions Page xxxix

Action actions[] = { actCut, actCopy, actPaste };int mnemonics[] = { 'c', 'o', 'p' };for( int i = 0; i < actions.length; i++ ) {

JMenuItem mi = mEdit.add(actions[i]);mi.setMnemonic( mnemonics[i]);

String s =actions[i].getValue( Action.SHORT_DESCRIPTION ).toString();

mi.setToolTipText( s );}

mb.add(mEdit);


// Options | Toolbar

JMenuItem miOToolbar = new JCheckBoxMenuItem("Toolbar", true);miOToolbar.setMnemonic('t');miOToolbar.addActionListener( mh );miOToolbar.setActionCommand("OptionsToolbar");mOptions.add(miOToolbar);

// Add separator & Font item to Options menumOptions.addSeparator();JMenuItem miOFont = new JMenuItem("Text Font...", 'f');miOFont.addActionListener( mh );

d("OptionsFont");miOFont.setActionCommanmOptions.add(miOFont);

mb.add(mOptions);

// Attach menubar to frame.getRootPane().setJMenuBar(mb);

}

ext ) {private void showStatus( String tstatusBar.showStatus( text );

}

// INNER CLASSES// Inner class for status barprivate class StatusBar extends JPanel {

= new JLabel( "", JLabel.LEFT );private JLabel labelpublic StatusBar() {

setLayout( new BorderLayout() );setBackground( Color.lightGray );label.setForeground( Color.black );

ateLoweredBevelBorder());label.setBorder( BorderFactory.creadd( label, BorderLayout.SOUTH );

}

ext ) {public void showStatus( String tt( " " + text );label.setTex

doLayout();



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Java SWing: Workshop Solutions Page xl

}} // end of StatusBar class

// Inner class for toolbar// private class ToolBar extends JPanel


public ToolBar() {// Add actions to the toolbar to create buttons.Action actions[] = { actCut, actCopy, actPaste };for( int i = 0; i < actions.length; i++ ) {

JButton btn = add(actions[i]);String s =

actions[i].getValue( Action.SHORT_DESCRIPTION).toString();


/* JButton btnCut = new JButton("Cut");btnCut.setActionCommand("cut");btnCut.setMnemonic('c');btnCut.setToolTipText("Cut to clipboard");btnCut.addActionListener( this );

JButton btnCopy = new JButton("Copy");btnCopy.setActionCommand("copy");btnCopy.setMnemonic('o');

pboard");btnCopy.setToolTipText("Copy to clibtnCopy.addActionListener( this );

JButton btnPaste = new JButton("Past

paste");

e");

btnPaste.setActionCommand("btnPaste.setMnemonic('p');btnPaste.setToolTipText("Paste from clipboard");btnPaste.addActionListener( this );

setBackground( Color.lightGray );FlowLayout( FlowLayout.LEFT ));setLayout( new

add( btnCut );add( btnCopy );add( btnPaste );

*/}








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Java SWing: Workshop Solutions Page xli

// Login windowprivate class LoginDialog extends JDialog


boolean OKflag[];

JLabel labelUID = new JLabel("User ID:", JLabel.RIGHT);JLabel labelPWD = new JLabel("Password:", JLabel.RIGHT);JTextField tfUID = new JTextField();JTextField tfPWD = new JTextField();JButton btnOK = new JButton("OK");JButton btnCancel = new JButton("Cancel");


// Set up accelerators & mnemonics// For user ID field, use JTextField.setFocusAccelerator()

tfUID.setFocusAccelerator( 'u' );labelUID.setDisplayedMnemonic( 'u' );

// For password field, use JLabel.setLabelFor()labelPWD.setLabelFor( tfPWD );labelPWD.setDisplayedMnemonic( 'p' );


// Button event handling performed by LoginDialogbtnOK.addActionListener( this );

btnCancel.addActionListener( this );

/*// A simple anonymous adapter to handle// windowClosing event.addWindowListener( new WindowAdapter() {

ndowEvent we ) {public void windowClosing( Wiwe.getWindow().dispose();

}} );



);

show();}

{public void actionPerformed( ActionEvent ae )ok") ) {if( ae.getActionCommand().equals("

// Check if User ID is correct



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Java SWing: Workshop Solutions Page xlii

if( ! tfUID.getText().trim().toUpperCase().equals("STUDENT")) {

JOptionPane.showMessageDialog( null,"Sorry, invalid user ID.\nTry again.", "Invalid Login",JOptionPane.WARNING_MESSAGE );

tfUID.requestFocus();tfUID.selectAll();return;

}

// Check if password is correctif( ! tfPWD.getText().trim().toUpperCase().equals("LEARN") )

{JOptionPane.showMessageDialog( null,

"Sorry, invalid password.\nTry again.", "Invalid Login",JOptionPane.WARNING_MESSAGE );

tfPWD.requestFocus();tfPWD.selectAll();return;

}

OKflag[0] = true;}dispose();

}

private void initLayout() {GridBagLayout gbl = new GridBagLayout();GridBagConstraints gbc = new GridBagetContentPane().setLayout( gbl );

gConstraints();


login window// Add UID label togbc.gridx = 0;gbc.gridy = 0;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.EAST;gbc.fill = GridBagConstraints.HORIZONTAL;

); // apply constraintsgbl.setConstraints( labelUID, gbcgetContentPane().add( labelUID );

login window// Add PWD label togbc.gridx = 0;gbc.gridy = 1;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.EAST;gbc.fill = GridBagConstraints.HORIZONTAL;

); // apply constraintsgbl.setConstraints( labelPWD, gbcgetContentPane().add( labelPWD );



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Java SWing: Workshop Solutions Page xliii

// Add UID text field to login windowgbc.gridx = 2;gbc.gridy = 0;gbc.gridwidth = 2;gbc.gridheight = 1;

gbc.weightx = 1;gbc.weighty = 1;gbc.anchor = GridBagConstraints.WEST;gbc.fill = GridBagConstraints.HORIZONTAL;gbl.setConstraints( tfUID, gbc ); // apply constraintsgetContentPane().add( tfUID );

// Add PWD text field to login windowgbc.gridx = 2;gbc.gridy = 1;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;

gbc.anchor = GridBagConstraints.WEST;gbc.fill = GridBagConstraints.HORIZONTAL;gbl.setConstraints( tfPWD, gbc ); // apply constraintsgetContentPane().add( tfPWD );

// Add OK button togbc.gridx = 1;

login window

gbc.gridy = 2;gbc.gridwidth = 1;gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.CENTER;gbc.fill = GridBagConstraints.NONE;

); // apply constraintsgbl.setConstraints( btnOK, gbcgetContentPane().add( btnOK );

// Add Cancel button to login windowgbc.gridx = 2;gbc.gridy = 2;gbc.gridwidth = 1;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;

;gbc.anchor = GridBagConstraints.CENTERgbc.fill = GridBagConstraints.NONE;

); // apply constraintsgbl.setConstraints( btnCancel, gbcgetContentPane().add( btnCancel );




// end of MainWindow class}



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// FontSetter is a convenience class. Its one static// method, setFont(), is used to change the font setting// for all components in a container. This is simply// to make the font bigger for display purposes; it has// no bearing on the exercise.

class FontSetter {// Change the font of the desired component and// all its contained components and menus.public static void setFont( Component c, Font f ) {

if( c instanceof JMenu ) {JMenu mnu = (JMenu) c;for(int i = 0; i < mnu.getMenuComponentCount(); i++)

setFont( mnu.getMenuComponent(i), f );}else if( c instanceof Container ) {

Container cont = (Container) c;for(int i = 0; i < cont.getComponentCount(); i++)

setFont( cont.getComponent(i), f );

}c.setFont( f );}

}



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Workshop 7: Using Internal Frames

SwingApp.java

// SwingApp.java

// After Internal Frames exercise.

import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.*;import javax.swing.event.*;import javax.swing.text.JTextComponent;

public class SwingApp {

public static void main( String[] args ) {new MainWindow(args);}

}

class MainWindow extends JFrame {private ToolBar toolBar_ ;private StatusBar statusBar_ = new StatusBar();private JTextArea textArea_; // = new JTextprivate Action actCut_, actCopy_, actPaste_;

Area();

private JDesktopPane desktop_ = new JDesktopPane();private int intNewFileCounter;

// Constructorpublic MainWindow(String[] args) {super("Studentsoft Super System");initActions();

;initLayout()initMenu();




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Java SWing: Workshop Solutions Page xlvi

// A simple anonymous adapter to handle

indowClosing( WindowEvent we ) {quit(0);

} );


// windowClosing event.addWindowListener( new WindowAdapter() {

public void w

}


ow();


quit(0);

sh


if( ! login()



n() {

ew boolean[1];

return bOK[0];}




g Application",


urn true;


// return true;boolean bOK[] = nbOK[0] = false;new LoginDialog(bOK);

// Private methodsprivate void cut() {textArea_.cut();

}

private void copy() {textArea_.copy();

}

private void paste() {textArea_.paste();

}




}else



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return false;}

ew NotepadChild( title ); _.add( pad );

pad.setSelected(true); // Make it the active notepad

catch( Exception e ) {}}

newChild( "Untitled " + ++intNewFileCounter );}

t intAnsw = fc.showOpenDialog(this);

leChooser.CANCEL_OPTION )

pened file: " + fc.getSelectedFile() );return true;

}

private void newChild( String title ) {

JInternalFrame pad = ndesktoptry {

}

private void newFile() {

private boolean openFile() {JFileChooser fc = new JFileChooser();

in // If user clicked cancel, return falseif( intAnsw == JFi

return false;newChild( fc.showStatus( "O

getSelectedFile().toString() );

private boolean chooseFont( JTextCom ponent tc ) {font names.

vironment.getLocalGraphicsEnvironment().getAvailableFontFamilymes();

ptionPane.QUESTION_MESSAGE,getName() );

// Compose array ofString fonts[] =

aphicsEnGrNa

Font curFont = tc.getFont(); // Get current settingutDialog( this,Object oChoice = JOptionPane.showInp

"Choose a font:", "Choose Font", JO null, fonts, curFont.

l )if( oChoice == nul

return false;tring) oChoice, curFont.getStyle(),tc.setFont( new Font( (S

ize() ));curFont.getS tc.repaint();

return true;}


:// Action objects for cut, copy, pasteactCut_ = new AbstractAction("Cut") {


}};



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actCut_.putValue(Action.SHORT_DESCRIPTION,"Cut text to clipboard");

actCopy_ = new AbstractAction("Copy") {t ae) {

py_.putValue(Action.SHORT_DESCRIPTION,

public void actionPerformed(ActionEven

copy();}

};actCo

"Copy text to clipboard");

actPaste_ = new AbstractAction("Paste") {ae) {

ste_.putValue(Action.SHORT_DESCRIPTION,

public void actionPerformed(ActionEventpaste();

}};

actPa"Paste text from clipboard");

}


rue ););

t text here");

toolBar_ = new ToolBar();

/*// Configure text areatextArea_.setLineWrap( ttextArea_.setWrapStyleWord( truetextArea_.setToolTipText("Enter / editextArea_.setBorder( BorderFactory.createTitledBorder( "Workspace"

));*/

// Configure frame

setBounds( 100, 100, 500, 300 );getContentPane().add( BorderLayout.NORTH , toolBar_ );// getContentPane().add( BorderLayout.CENTER, textArea_ );

getContentPane().add( BorderLayout.CENTER, desktop_ );getContentPane().add( BorderLayout.SOUTH , statusBar_ );

/*// Create caret listener for textArea_ to react when// selection changestextArea_.addCaretListener( new CaretListener() {

public void caretUpdate(CaretEvent e) {boolean isSelection = textArea_.getSelectionStart() !=

textArea_.getSelectionEnd();actCut_.setEnabled(isSelection);actCopy_.setEnabled(isSelection);

}});

*/}





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Java SWing: Workshop Solutions Page xlix

if( ae.getActionCommand().equals("FileNew") ) {

New file created");

e if( ae.getActionCommand().equals("FileOpen") )

ctionCommand().equals("FileSave") )

.equals("FileExit") )

Toggle toolbar visibility.equals("OptionsToolbar") ) {

olBar_.setVisible( cbmi.isSelected() );

newFile();showStatus("

}els

// showStatus("File opened");openFile();

else if( ae.getAshowStatus("File saved");

else if( ae.getActionCommand()quit( 0 );

//else if( ae.getActionCommand()

// Get source, cast it as JCheckBoxMenuItem:JCheckBoxMenuItem cbmi = (JCheckBoxMenuItem)

ae.getSource();togetContentPane().doLayout();

}

// Set font on text areand().equals("OptionsFont") )else if( ae.getActionComma

chooseFont(textArea_);

}}


// Create menu bar

"File");

");

JMenuBar mb = new JMenuBar();

// Assemble File menu:JMenu mFile = new JMenu(mFile.setMnemonic('f');

// File | NewJMenuItem miFNew = new JMenuItem("New", 'n');miFNew.addActionListener( mh );miFNew.setActionCommand("FileNew");miFNew.setAccelerator(

KeyStroke.getKeyStroke(KeyEvent.VK_N, Event.CTRL_MASK, true ));mFile.add(miFNew);

// File | OpenJMenuItem miFOpen = new JMenuItem("Open", 'o');miFOpen.addActionListener( mh );miFOpen.setActionCommand("FileOpen");miFOpen.setAccelerator(

KeyStroke.getKeyStroke(KeyEvent.VK_O, Event.CTRL_MASK, true ));mFile.add(miFOpen);

// File | SaveJMenuItem miFSave = new JMenuItem("Save", 's');miFSave.addActionListener( mh );miFSave.setActionCommand("FileSave



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Java SWing: Workshop Solutions Page l

miFSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, Event.CTRL_MASK, true ));

mFile.add(miFSave);

// Separator

ator();mFile.addSepar

// File | Exitt = new JMenuItem("Exit", 'x');

");

JMenuItem miFEximiFExit.addActionListener( mh );miFExit.setActionCommand("FileExitmFile.add(miFExit);

// Attach File menu to menu barmb.add(mFile);

// Create Edit menu from Action objectsJMenu mEdit = new JMenu("Edit");

mEdit.setMnemonic('e');

Action actions[] = { actCut_, actCopy_, actPaste_ };

{

getValue( Action.SHORT_DESCRIPTION ).toString();

int mnemonics[] = { 'c', 'o', 'p' };for( int i = 0; i < actions.length; i++ )

JMenuItem mi = mEdit.add(actions[i]);mi.setMnemonic( mnemonics[i]);String s =

actions[i].mi.setToolTipText( s );

}

mb.add(mEdit);


// Options | ToolbarJMenuItem miOToolbar = new JCheckBoxMenuItem("Toolbar", true);miOToolbar.setMnemonic('t');miOToolbar.addActionListener( mh );miOToolbar.setActionCommand("OptionsToolbar");mOptions.add(miOToolbar);

// Add separator & Font item to Options menumOptions.addSeparator();JMenuItem miOFont = new JMenuItem("Text Font...", 'f');miOFont.addActionListener( mh );miOFont.setActionCommand("OptionsFont");mOptions.add(miOFont);

mb.add(mOptions);

// Attach menubar to frame.getRootPane().setJMenuBar(mb);



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Java SWing: Workshop Solutions Page li

}

private void showStatus( String text ) {statusBar_.showStatus( text );

}

// INNER CLASSESstatus bar

JPanel {JLabel.LEFT );

erLayout() );

;LoweredBevelBorder());

// Inner class forprivate class StatusBar extends

private JLabel label_ = new JLabel( "",public StatusBar() {

setLayout( new BordsetBackground( Color.lightGray );label_.setForeground( Color.black )label_.setBorder( BorderFactory.createadd( label_, BorderLayout.SOUTH );

}

public void showStatus( String text ) {

end of StatusBar class

nds JPanel

the toolbar to create buttons.};

getValue( Action.SHORT_DESCRIPTION

label_.setText( " " + text );doLayout();}

} //

// Inner class for toolbar// private class ToolBar exte


public ToolBar() {// Add actions toAction actions[] = { actCut_, actCopy_, actPaste_for( int i = 0; i < actions.length; i++ ) {

JButton btn = add(actions[i]);String s =actions[i].

).toString();btn.setToolTipText( s );

}

/*JButton btnCut = new JButton("Cut");btnCut.setActionCommand("cut");btnCut.setMnemonic('c');btnCut.setToolTipText("Cut to clipboard");btnCut.addActionListener( this );

JButton btnCopy = new JButton("Copy");btnCopy.setActionCommand("copy");btnCopy.setMnemonic('o');btnCopy.setToolTipText("Copy to clipboard");btnCopy.addActionListener( this );




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Java SWing: Workshop Solutions Page lii

setBackground( Color.lightGray );ut.LEFT ));

}

setLayout( new FlowLayout( FlowLayoadd( btnCut );add( btnCopy );

add( btnPaste );*/

// Event handling for Cut, Copy and Paste buttons

.getActionCommand().equals("copy") )

getActionCommand().equals("paste") )

end of ToolBar class

public void actionPerformed( ActionEvent ae ) {if( ae.getActionCommand().equals("cut") )

cut();else if( ae

copy();else if( ae.

paste();}

} //

// Login windowinDialog extends JDialogprivate class Log


boolean OKflag_[];new JLabel("User ID:", JLabel.RIGHT);

);

// A simple anonymous adapter to handle

JLabel labelUID_ =JLabel labelPWD_ = new JLabel("Password:", JLabel.RIGHT);JTextField tfUID_ = new JTextField();JTextField tfPWD_ = new JTextField();JButton btnOK_ = new JButton("OK");JButton btnCancel_ = new JButton("Cancel"

public LoginDialog( boolean[] OKflag ) {super( MainWindow.this, "User Login", true );OKflag_ = OKflag;initLayout();

// Set up accelerators & mnemonics// For user ID field, use JTextField.setFocusAccelerator()tfUID_.setFocusAccelerator( 'u' );labelUID_.setDisplayedMnemonic( 'u' );

// For password field, use JLabel.setLabelFor()labelPWD_.setLabelFor( tfPWD_ );labelPWD_.setDisplayedMnemonic( 'p' );

// Set up action commandsbtnOK_.setActionCommand("ok");btnCancel_.setActionCommand("cancel");

// Button event handling performed by LoginDialogbtnOK_.addActionListener( this );btnCancel_.addActionListener( this );

/*



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Java SWing: Workshop Solutions Page liii

// windowClosing event.addWindowListener( new WindowAdapter() {

we ) {

// Use default closing mechanism to close dialog);

public void windowClosing( WindowEventwe.getWindow().dispose();

}

} );*/

setDefaultCloseOperation( JDialog.DISPOSE_ON_CLOSE

// Set font of entire frame just before showing.nt.PLAIN, 24)FontSetter.setFont( this, new Font("SansSerif", Fo

);

show();}


UpperCase().equals("ALICE")

JOptionPane.showMessageDialog( null,"Invalid Login",

if( ae.getActionCommand().equals("ok") ) {

// Check if User ID is correctif( ! tfUID_.getText().trim().to) {

"Sorry, invalid user ID.\nTry again.",JOptionPane.WARNING_MESSAGE );

tfUID_.requestFocus();tfUID_.selectAll();return;

}

// Check if password is correctpperCase().equals("DRINKif( ! tfPWD_.getText().trim().toU

ME") ) {

JOptionPane.showMessageDialog( null,"Sorry, invalid password.\nTry again.", "Invalid Login",JOptionPane.WARNING_MESSAGE );

tfPWD_.requestFocus();tfPWD_.selectAll();return;

}

OKflag_[0] = true;}dispose();

}

private void initLayout() {GridBagLayout gbl = new GridBagLayout();GridBagConstraints gbc = new GridBagConstraints();getContentPane().setLayout( gbl );


// Add UID label to login windowgbc.gridx = 0;gbc.gridy = 0;gbc.gridwidth = 2;



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Java SWing: Workshop Solutions Page liv

gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.EAST;

TAL;

onstraints

gbc.fill = GridBagConstraints.HORIZON

gbl.setConstraints( labelUID_, gbc ); // apply cgetContentPane().add( labelUID_ );

// Add PWD label to login window

BagConstraints.EAST;TAL;

onstraints

gbc.gridx = 0;gbc.gridy = 1;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = Gridgbc.fill = GridBagConstraints.HORIZONgbl.setConstraints( labelPWD_, gbc ); // apply cgetContentPane().add( labelPWD_ );

// Add UID text field to login window

BagConstraints.WEST;

gbc.gridx = 2;gbc.gridy = 0;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;gbc.anchor = Gridgbc.fill = GridBagConstraints.HORIZONTAL;gbl.setConstraints( tfUID_, gbc ); // apply constraintsgetContentPane().add( tfUID_ );

// Add PWD text field to login window

gbc.gridx = 2;gbc.gridy = 1;gbc.gridwidth = 2;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;gbc.anchor = GridBagConstraints.WEST;gbc.fill = GridBagConstraints.HORIZONTAL;gbl.setConstraints( tfPWD_, gbc ); // apply constraintsgetContentPane().add( tfPWD_ );

// Add OK button to login windowgbc.gridx = 1;gbc.gridy = 2;gbc.gridwidth = 1;gbc.gridheight = 1;gbc.weightx = 0;gbc.weighty = 1;gbc.anchor = GridBagConstraints.CENTER;gbc.fill = GridBagConstraints.NONE;gbl.setConstraints( btnOK_, gbc ); // apply constraintsgetContentPane().add( btnOK_ );

// Add Cancel button to login windowgbc.gridx = 2;



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gbc.gridy = 2;gbc.gridwidth = 1;gbc.gridheight = 1;gbc.weightx = 1;gbc.weighty = 1;

gbc.anchor = GridBagConstraints.CENTER;

apply constraintsgbc.fill = GridBagConstraints.NONE;gbl.setConstraints( btnCancel_, gbc ); //getContentPane().add( btnCancel_ );

tfUID_.requestFocus(); // Put focus on ID field



// NotepadChild class is the internal frame rame {private class NotepadChild extends JInternalFprivate JTextArea textArea_ = new JTextArea();

public NotepadChild( String title ) {super( title, true, true, true, true );

// Configure text arearue );

);24)

textArea_.setLineWrap( ttextArea_.setWrapStyleWord( true );textArea_.setToolTipText("Enter / edit text here");getContentPane().add( BorderLayout.CENTER, textArea_FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN,

);

pack();setBounds( 50, 50, 300, 150 );

// Register a simple adapter to handle when internal frame// becomes active.addInternalFrameListener( new InternalFrameAdapter(){

public void internalFrameActivated(InternalFrameEvent e) {// Assign my text area as the one referenced by

MainWindowMainWindow.this.textArea_ = textArea_;

}});

// Create caret listener for textArea_ to react when// selection changestextArea_.addCaretListener( new CaretListener() {

public void caretUpdate(CaretEvent e) {boolean isSelection = textArea_.getSelectionStart() !=

textArea_.getSelectionEnd();actCut_.setEnabled(isSelection);actCopy_.setEnabled(isSelection);

}});

} // end of NotepadChild ctor



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Java SWing: Workshop Solutions Page lvi

} // end of NotepadChild class


FontSetter is a convenience class. Its one staticg

ass FontSetter {t of the desired component and

t f ) {

etMenuComponentCount(); i++)

e if( c instanceof Container ) {

entCount(); i++)

//// method, setFont(), is used to change the font settin// for all components in a container. This is simply// to make the font bigger for display purposes; it has// no bearing on the exercise.

cl// Change the fon// all its contained components and menus.public static void setFont( Component c, Fon

if( c instanceof JMenu ) {

JMenu mnu = (JMenu) c;for(int i = 0; i < mnu.gsetFont( mnu.getMenuComponent(i), f );

}els

Container cont = (Container) c;for(int i = 0; i < cont.getCompon

setFont( cont.getComponent(i), f );}c.setFont( f );

}}



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Workshop 8: Using a List Model

ListDemo.java

// ListDemo.java

// ListModel Exercise


class ListDemo extends JFrame {private JTextField text_ = new JTextField();private DefaultListModel model_ = new DefaultListModel();

public static void main(String[] args) {new ListDemo(args);

}

private ListDemo(String[] args) {super("JList & ListModel Demonstration");JList list = new JList();getContentPane().add(BorderLayout.NORTH, text_);getContentPane().add(BorderLayout.CENTER, new JSJButton btn = new JButton("Add Name to Model");

crollPane(list));

getContentPane().add(BorderLayout.SOUTH, btn);pack();

// Button event handlerbtn.addActionListener( new ActionListener() {public void actionPerformed( ActionEvent ae ) {

model_.addElement( text_.getText() );text_.setText("");

ext_.requestFocus();t}

});

s into the model// Load a few name



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Java SWing: Workshop Solutions Page lviii

String[] names ={ "Berlin", "Beethoven", "Bach", "Berlioz", "Gershwin",

+ )

model_.addElement( names[i] );

list.setModel( model_ );

"Lennon", "McCartney", "Mozart", "Stravinsky" };

for( int i = 0; i < names.length; i+

// Apply model

setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE );// Use default closing mechanism to close frame

setBounds( 200, 100, 300, 400 ); // Size frame


show();


r// End of class

g

isplay purposes; it hasexercise.

and

ponent c, Font f ) {

t(); i++)), f );

t(); i++)nt.getComponent(i), f );

c.setFont( f );}

} // End of c'to}

// FontSetter is a convenience class. Its one static// method, setFont(), is used to change the font settin// for all components in a container. This is simply// to make the font bigger for d// no bearing on the class FontSetter {

// Change the font of the desired component// all its contained component

om

s and menus.

public static void setFont( Cif( c instanceof JMenu ) {JMenu mnu = (JMenu) c;for(int i = 0; i < mnu.getMenuComponentCoun

setFont( mnu.getMenuComponent(i}else if( c instanceof Container ) {

Container cont = (Container) c;for(int i = 0; i < cont.getComponentCoun

setFont( co}

}

java swing v2.1 workshop solutions

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