java lab manual 1 it

8/3/2019 Java Lab Manual 1 It

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HOLY MARY INSTITUTE OF TECHNOLOGY &

SCIENCE

(COLLEGE OF ENGINEERING)

Bogaram(v),Keesara(M),R.R.Dist 501 301

Department Of Computer Science & Engineering

Subject : Dbms Lab Manual

Branch : B.Tech IT

Class : IIrd Year

Semester : IInd

A.Y. : 2009 2010

Created By M.Monika(Asst.Prof,HITS)


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HOLY MARY INSTITUTE OF TECHNOLOGY & SCIENCES

(college of Engineering)

Subject:Java Lab Manual Regulation:R07

Course: II B.Tech. II Sem. Branch: IT

Introduction to Java:

Java is great programming language for the development of enterprise gradeapplications. This programming Language is evolved from a language named Oak.Oak was developed in the early nineties at Sun Microsystems as a platform-independent language aimed at allowing entertainment appliances such as videogame consoles and VCRs to communicate . Oak was first slated to appear intelevision set-top boxes designed to provide video-on-demand services. Oak wasunsuccessful so in 1995 Sun changed the name to Java and modified the languageto take advantage of the burgeoning World Wide Web.Java is an object-orientedlanguage, and this is very similar to C++. Java Programming Language issimplified to eliminate language features that cause common programming errors.Java source code files are compiled into a format called bytecode, which can then

be executed by a Java interpreter. What is JDK (Java Development Kit)

JDK is a software development program provided by sun Microsystems. JavaDevelopment Kit or JDK comes in various version and can be downloaded freefrom the sun Microsystems. JVM compiler, debugger and other tools are used withJDK for developing java based application & java applets. So make sure that yourJVM compiler & JDK versions are same. JDK also known as Java 2 Platform, Thatcomes in three editions J2ME, J2SE & J2EE. If you are beginner or learning Javathen start by downloading J2SE.Acronyms:JDK Java Development KitJVM Java virtual machineDownload JDKYou can download JDK from www.javasoft.com/j2seLatest version of JDK

jdk1.6.0_15

http://java.sun.com/j2se/Downloads/index.jsp

Holymary Institute of Technology & Sciences 2
http://java.sun.com/j2se/Downloads/index.jsphttp://java.sun.com/j2se/Downloads/index.jsp


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Program Strucuture of java in Java Language:

The fundamental structure of any Java programme should look like:

[package declarations]

[import statements]

[class declaration]

An example is given below:

package abc;

import java.lang;

class Demo {

public static void main(String[] args) {

Sytem.out.println("Hello! World");

}

}

//The file containing this class must be named Demo.java

How to set the path for Java

1.Go to MyComputer properties->Advanced ->Environment Variables.

2.Find the path in SystemVariables and Edit it to your Jdk/bin folder.

3.Now your path is set and you can run the programs from anywhere.



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Week1 :

a) Write a Java program that prints all real solutions to the quadratic equation ax2+ bx + c = 0. Read in a, b, c and use the quadratic formula. If the discriminant b2-4ac is negative, display a message stating that there are no real solutions.

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

double a,b,c,root1,root2;a=3.0;

b=4.0;

c=2.0;if((b*b-4*a*c)==0){

System.out.println("\n ROOTS ARE EQUAL");root1=-b/(2*a);System.out.println("\n root "+root1);

}if((b*b-4*a*c) > 0){

root1=-b+Math.sqrt(b*b-4*a*c)/(2*a);root2=-b-Math.sqrt(b*b-4*a*c)/(2*a);System.out.println("\nROOTS ARE REAL:\n");System.out.println("\n root1 "+root1+"\n root2 "+root2);

} elseSystem.out.println("\n Imaginary Roots.");

}} // End of Class

Output

ROOTS ARE REAL:

root1 -5.422649730810374root2 -6.577350269189626



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Week 1:

b) The Fibonacci sequence is defined by the following rule: The fist two values inthe sequence are 1 and 1. Every subsequent value is the sum of the two valuespreceding it. Write a Java program that uses both recursive and non recursivefunctions to print the nth value in the Fibonacci sequence.

public class LabPro2{

public static void main(String args[]){

String n1;int f1=1,f2=1,n,i,f3;n1=5;n=Integer.parseInt(n1);System.out.println("series"+f1+f2);for(i=1;i


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Week 2 :

a) Write a Java program that prompts the user for an integer and then prints outall prime numbers up to that integer.

import javax.swing.*;public class LabPro3{


String n1;int n,c=0,i,j;

n1=JOptionPane.showInputDialog("enter n value");n=Integer.parseInt(n1);outer:

for(i=2;i


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Week 2 :



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b) Write a Java program to multiply two given matrices.

import javax.swing.*;public class BTechJavaLab6{

public static void main(String args[]){String n,l,m=" ";int i,j,k;int a[][]=new int[3][3];int b[][]=new int[3][3];int c[][]=new int[3][3];for(i=0;i


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}

}

Output:



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Week 2 :



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c) Write a Java Program that reads a line of integers, and then displays eachinteger, and the sum of all the integers (Use StringTokenizer class of java.util)

import javax.swing.*;import java.util.*;import java.io.*;public class LabPro7{public static void main(String args[])throws IOException{

int sum=0;String line=JOptionPane.showInputDialog("enter the line");String k=JOptionPane.showInputDialog("enter the delemeter");StringTokenizer wd=new StringTokenizer(line,k);while(wd.hasMoreTokens())sum=sum+Integer.parseInt(wd.nextToken());JOptionPane.showMessageDialog(null,"sum is"+sum);

}}

Option:



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Week 3 :

a) Write a Java program that checks whether a given string is a palindrome or not.Ex: MADAM is a palindrome.

import java.util.*;public class LabPro4{


StringBuffer sb=new StringBuffer(args[0]);String t=sb.reverse().toString();System.out.println("reverse "+t);System.out.println("boolean results");System.out.println("check with == "+(t==args[0]));System.out.println("check with equals "+(t.equals(args[0])));System.out.println("given string "+args[0]);if(t.equals(args[0]))System.out.println("is a pallindrome");elseSystem.out.println("is not a pallindrome");

}}

Output:

reverse MADAM

boolean results

check with == false

check with equals true

given string MADAM

is a palindrome



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Week 3 :

b) Write a Java program for sorting a given list of names in ascending order.

import java.io.*;

import javax.swing.JOptionPane;

class Ascend

{

public static void main(String[] args)

{

String name[]={"","",""},temp;

for(int i=0;i


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}

for(int i=0;i


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Week 3 :

c) Write a Java program to make frequency count of words in a given text.

import java.io.*;

import javax.swing.JOptionPane;

import java.util.*;

class Count

{

public static void main(String[] args) throws IOException

{

String s;

int i=0,count=0,l=0;

s=JOptionPane.showInputDialog("enter a file name");

FileInputStream f=new FileInputStream(s);

DataInputStream d=new DataInputStream(f);

while(d.readLine()!=null)

{

i++;

StringTokenizer s1=new StringTokenizer(d.readLine());

while(s1.hasMoreTokens())

{

String b=s1.nextToken();

count++;

l=l+b.length();

}



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}

JOptionPane.showMessageDialog(null,"words="+count+"\nlines="+i+"\n

characters="+l,"Message",JOptionPane.INFORMATION_MESSAGE);

}

}

Output:



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Week 4 :

a) Write a Java program that reads a file name from the user, then displaysinformation about whether the file exists, whether the file is readable, whetherthe file is writable, the type of file and the length of the file in bytes.

import java.io.*;import java.util.*;public class LabPro8{


File f=new File(args[0]);System.out.println("Filename " +f.getName());System.out.println("Filepath " +f.getPath());System.out.println("Parent " +f.getName());System.out.println("File size " +f.length()+" bytes");System.out.println("is readable " +f.canRead());

System.out.println("is Writable " +f.canWrite());System.out.println("is directory " +f.isDirectory());System.out.println("is file " +f.isFile());

}}

Output:

Arguments given: C:\holy.txt

Filename holy.txt

Filepath C:\holy.txt

Parent holy.txt

File size 18 bytes

is readable true

is Writable true

is directory false

is file true



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Week 4 :

b) Write a Java program that reads a file and displays the file on the screen, with aline number before each line.

import java.io.*;import java.util.*;public class LabPro9{public static void main(String args[]){try{

FileInputStream f=new FileInputStream("C:\\run.txt");LineNumberReader lr=new LineNumberReader(new

InputStreamReader(f));String data;while((data=lr.readLine())!=null){System.out.println(lr.getLineNumber()+":"+data);}System.out.println("total lines"+lr.getLineNumber());f.close();

}catch(Exception e){System.out.println("err"+e);}}}

Output:

run:

1:Hello, Welcome to Holy Mary groups

2:hello,java world

total lines2



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Week 4 :

c) Write a Java program that displays the number of characters, lines and words ina text file.

import java.io.*;import java.util.*;public class LabPro10{

public static void main(String args[]){try{

FileInputStream f=new FileInputStream("C:\\run.txt");LineNumberReader lr=new LineNumberReader(new

InputStreamReader(f));String data;StringTokenizer st;int words=0,chars=0;while((data=lr.readLine())!=null){st=new StringTokenizer(data);words+=st.countTokens();

chars+=data.length();}System.out.println("total words"+words);System.out.println("total chars"+chars);System.out.println("total lines"+lr.getLineNumber());f.close();

}catch(Exception e){System.out.println("err"+e);}}}

Output:

run:

total words8

total chars50

total lines2



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Week 5 :

a) Write a Java program that Implements stack ADT.

import java.util.*;import javax.swing.JOptionPane;class Stackdemo{

public static void main(String[] args){

Stack st=new Stack();int j;do{

String s=JOptionPane.showInputDialog("enter ur choice\n1->input\n2->delete\n3->exit");

j=Integer.parseInt(s);if(j==1){

s=JOptionPane.showInputDialog("enter anelement");

st.push(Integer.parseInt(s));JOptionPane.showMessageDialog(null,"stack

elements:"+st,"stack elements",JOptionPane.INFORMATION_MESSAGE);

}try{

if(j==2){

Integer a=(Integer)st.pop();

JOptionPane.showMessageDialog(null,"stack elements:"+st,"stackelements",JOptionPane.INFORMATION_MESSAGE);

}}catch(EmptyStackException e){

JOptionPane.showMessageDialog(null,"STACK ISEMPTY"+e,"stack elements",JOptionPane.INFORMATION_MESSAGE);

}}while(j


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Output:



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Week 5 :

b) Converts infix expression into Postfix form iii) Evaluates the postfix expression

import java.io.*;import java.util.*;import javax.swing.JOptionPane;class Intopost{

public static void main(String[] args){

String s=JOptionPane.showInputDialog("enter infix expression");Stack st=new Stack();String output="";int i=0,len=s.length();char x;st.push('@');while(len!=0){

char c=s.charAt(i);if(c=='('){

st.push(c);}else if(c=='+'||c=='-'||c=='*'||c=='/'||c=='^'||c=='$')

{check(st,c,output);st.push(c);

}else if(c==')'){

while((x=(Character)st.pop())!='('){

output=output+x;}

}else{

output+=s.charAt(i);}

i=i+1;len--;

}while((x=(Character)st.pop())!='@'){

output+=x;}



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JOptionPane.showMessageDialog(null,output,"postfix

expression",JOptionPane.INFORMATION_MESSAGE);}

static void check(Stack st,char c,String output){

while(priority(c)


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Week 6 :

a) Develop an applet that displays a simple message.

import java.awt.*;import java.applet.Applet;/*< Applet code=LabPro12 width=300 height=300>< /Applet>*/

public class LabPro12 extends Applet{public void paint(Graphics g)

{g.drawString ("Hello Worlds",100,100);

}}

Output:



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Week 6 :

b) Develop an applet that receives an integer in one text field, and computes itsfactorial Value and returns it in another text field, when the button namedCompute is clicked.

import java.applet.*;import java.awt.*;import java.awt.event.*;

public class factorial extends Appletimplements ActionListener

{

Button btn,clearbtn;Label lbl1,lbl2;TextField tf1,tf2;

public void init(){

btn=new Button("COMPUTE");btn.addActionListener(this);

clearbtn=new Button("CLEAR");clearbtn.addActionListener(this);

tf1=new TextField(30);tf2=new TextField(30);

lbl1=new Label("NUMBER");

lbl2=new Label("RESULT");

setLayout(new GridLayout(3,2));add(lbl1); add(tf1);

add(lbl2); add(tf2);

add(btn); add(clearbtn);}

public void actionPerformed(ActionEvent e){if(e.getSource()==btn){int a=Integer.parseInt(tf1.getText());



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int fact=1;

for(int i=1;i


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Week 7 :

Write a Java program that works as a simple calculator.Use a grid layout to arrange buttons for the digits andfor the +, -,*, % operations. Add a text field to displaythe result.

import java.awt.event.*;import java.applet.Applet;import java.awt.*;

public class LabPro14 extends Applet implements ActionListener{

TextField t;String a;int p=0,tmp=0;Button bo,b1,b2,b3,b4,b5,b6,b7,b8,b9;

Button badd,bsub,bmul,bdiv,bper,beql,bc;public void init(){t = new TextField(50);bo = new Button("0");b1 = new Button("1");b2 = new Button("2");b3 = new Button("3");b4 = new Button("4");

b5 = new Button("5");b6 = new Button("6");b7 = new Button("7");b8 = new Button("8");b9 = new Button("9");badd = new Button("+");bsub = new Button("-");bmul = new Button("*");bdiv = new Button("/");bper = new Button("%");bc = new Button("c");beql = new Button("=");add(t);add(bo);add(b1);

add(b2);add(b3);add(b4);add(b5);add(b6);add(b7);add(b8);add(b9);add(badd);add(bsub);add(bmul);add(bdiv);add(bper);add(bc);add(beql);bo.addActionListener(this);b1.addActionListener(this);b2.addActionListener(this);b3.addActionListener(this);



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k=k*10+4;

t.setText(String.valueOf(k));}if(ae.getSource()==b5){int k=Integer.parseInt(t.getText());k=k*10+5;t.setText(String.valueOf(k));}if(ae.getSource()==b6){int k=Integer.parseInt(t.getText());k=k*10+6;t.setText(String.valueOf(k));}if(ae.getSource()==b7){int k=Integer.parseInt(t.getText());k=k*10+7;t.setText(String.valueOf(k));}if(ae.getSource()==b8){int k=Integer.parseInt(t.getText());k=k*10+8;t.setText(String.valueOf(k));

}if(ae.getSource()==b9){int k=Integer.parseInt(t.getText());k=k*10+9;t.setText(String.valueOf(k));}

if(ae.getSource()==badd){tmp=Integer.parseInt(t.getText());p=1;t.setText("0");}

if(ae.getSource()==bsub){tmp=Integer.parseInt(t.getText());p=2;t.setText("0");}if(ae.getSource()==bmul){tmp=Integer.parseInt(t.getText());



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p=3;

t.setText("0");}if(ae.getSource()==bdiv){tmp=Integer.parseInt(t.getText());p=4;t.setText("0");}if(ae.getSource()==bper){tmp=Integer.parseInt(t.getText());p=5;t.setText("0");}if(ae.getSource()==beql){float newval=Integer.parseInt(t.getText());float res=0;switch(p){case 1:res=tmp+newval;break;case 2:res=tmp-newval;

break;case 3:res=tmp*newval;break;case 4:res=tmp/newval;break;case 5:res=tmp%newval;break;}t.setText(String.valueOf(res));}

}}



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Output:



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Week 8 :

a) Write a Java program for handling mouse events.

import java.awt.*;import java.awt.event.*;import java.applet.Applet;public class LabPro15 extends Applet implements MouseListener{

String msg="welcome";int x=100,y=100;public void init(){addMouseListener(this);}public void paint(Graphics g){

g.drawString(msg,x,y);}public void update(Graphics g){

paint(g);}public void mouseClicked(MouseEvent e){}

public void mousePressed(MouseEvent e){

msg="to";x=150;y=150;repaint();

}public void mouseReleased(MouseEvent e){

msg="gmrit";x=200;y=200;repaint();

}public void mouseEntered(MouseEvent e){}

public void mouseExited(MouseEvent e){}

}

Output:



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Week 9 :

a) Write a Java program that creates three threads. First thread displays GoodMorning every one second, the second thread displays Hello every two secondsand the third thread displays Welcome every three seconds.

class tst implements Runnable{

String name;Thread t;tst(String threadname){name = threadname;t = new Thread(this, name);

System.out.println("newThread : " +t);t.start();}public void run(){try{for(int i=5;i > 0;i--){System.out.println(name + ": " + i);Thread.sleep(1000);

}}

catch(InterruptedException e){System.out.println(name + "Interrupted");}System.out.println(name + "exiting");

}}class LabPro16{


new tst("Good Morning");new tst("Hello");new tst("Welcome");try{Thread.sleep(10000);

}catch(InterruptedException e){



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System.out.println("Main thread Interrupted");

}System.out.println("Main thread exiting");

}}

Output:

run:newThread : Thread[Good Morning,5,main]newThread : Thread[Hello,5,main]newThread : Thread[Welcome,5,main]Good Morning: 5Hello: 5Welcome: 5Good Morning: 4Hello: 4Welcome: 4Good Morning: 3Welcome: 3Hello: 3Good Morning: 2

Hello: 2Welcome: 2Good Morning: 1Welcome: 1Hello: 1Good MorningexitingWelcomeexitingHelloexiting



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Week 9 :

b) Write a Java program that correctly implements producer consumer problemusing the concept of inter thread communication.

class LabPro17{

int n;boolean vs = false;synchronized int get(){if(!vs)try{wait();}catch(InterruptedException e){ System.out.println("InterruptedException caught");}System.out.println("got:" + n);vs = false;

notify();return n;}synchronized int put(int n){if(vs)try{wait();}catch(InterruptedException e)

{ System.out.println("InterruptedException caught");}this.n = n;vs = true;

System.out.println("put:" + n);notify();

return n;}

}class Producer implements Runnable{

LabPro17 k;Producer(LabPro17 k){

this.k = k;new Thread(this, "Producer").start();

}public void run(){int i = 0;while(true){k.put(i++);}}



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}

class Consumer implements Runnable{

LabPro17 k;Consumer(LabPro17 k){this.k = k;new Thread(this, "Consumer").start();

}public void run(){while(true)

{k.get();}}

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

{LabPro17 k = new LabPro17();new Producer(k);new Consumer(k);System.out.println("press control - c to stop. ");

}}

Output:

run:

put:0

press control - c to stop.

got:0

put:1

got:1

put:2

got:2

put:3

got:3



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put:4

got:4

put:5

got:5

put:6

got:6

put:7

got:7

put:8

got:8

put:9

got:9

put:10

got:10

put:11

got:11

put:12

got:12

put:13

got:13

put:14

got:14

put:15

got:15



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put:16

got:16

put:17

got:17

put:18

got:18

put:19

got:19



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Week 10 :

Write a program that creates a user interface to perform integer divisions. Theuser enters two numbers in the textfields, Num1 and Num2. The division of Num1and Num2 is displayed in the Result field when the Divide button is clicked. IfNum1 or Num2 were not an integer, the program would throw aNumberFormatException. If Num2 were Zero, the program would throw anArithmeticException Display the exception in a message dialog box.

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

public class Division extends JFrameimplements ActionListener

{Container c;JButton btn;JLabel lbl1,lbl2,lbl3;JTextField tf1,tf2,tf3;

JPanel p;SuhritDivision(){

super("Exception Handler");c=getContentPane();

c.setBackground(Color.red);btn=new JButton("DIVIDE");btn.addActionListener(this);

tf1=new JTextField(30);tf2=new JTextField(30);tf3=new JTextField(30);lbl1=new JLabel("NUM 1");lbl2=new JLabel("NUM 2");lbl3=new JLabel("RESULT");

p=new JPanel();p.setLayout(new GridLayout(3,2));

p.add(lbl1); p.add(tf1);p.add(lbl2); p.add(tf2);p.add(lbl3); p.add(tf3);

c.add(new JLabel("Division"),"North");c.add(p,"Center");c.add(btn,"South");

}



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public void actionPerformed(ActionEvent e){if(e.getSource()==btn){try{int a=Integer.parseInt(tf1.getText());int b=Integer.parseInt(tf2.getText());int c=a/b;tf3.setText(""+c);

}catch(NumberFormatException ex){

tf3.setText("--");JOptionPane.showMessageDialog(this,"Only Integer Division");

}catch(ArithmeticException ex){

tf3.setText("--");JOptionPane.showMessageDialog(this,"Division by zero");

}catch(Exception ex){

tf3.setText("--");JOptionPane.showMessageDialog(this,"Other Err "+ex.getMessage());

}}}


Division b=new Division();b.setSize(300,300);b.setVisible(true);

}}



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Output:



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Week 11 :

Write a Java program that allows the user to draw lines, rectangles and ovals.

import java.awt.*;import java.awt.event.*;import java.applet.*;public class LabPro19 extends Applet

implements MouseListener,ActionListener,MouseMotionListener{Button lines,ovals,rect,free;int ch;int x,y,x2,y2,k;

public void mouseClicked(MouseEvent e){

}public void mousePressed(MouseEvent e){

x=e.getX();y=e.getY();

}

public void mouseReleased(MouseEvent e){

x2=e.getX();y2=e.getY();

repaint();}public void mouseEntered(MouseEvent e){

}public void mouseExited(MouseEvent e){

}

public void mouseDragged(MouseEvent e){}public void mouseMoved(MouseEvent e){if(k==1){x2=e.getX();y2=e.getY();



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repaint();}

}

public void init(){lines=new Button("line");ovals=new Button("oval");rect =new Button("rect");free=new Button("free hand");

add(lines);add(ovals);add(rect);add(free);lines.addActionListener(this);ovals.addActionListener(this);rect.addActionListener(this);free.addActionListener(this);addMouseListener(this);addMouseMotionListener(this);}public void actionPerformed(ActionEvent ki){

if(ki.getSource()==lines){ ch=1; k=0;}else if(ki.getSource()==ovals){ ch=2; k=0;}else if(ki.getSource()==rect)

{ch=3; k=0;}else if(ki.getSource()==free){ ch=4; k=1;}

}public void paint(Graphics g){switch (ch){case 1:g.drawLine(x,y,x2,y2);

break;case 2:g.drawOval(x,y,(x2-x),(y2-y));

break;

case 3:g.drawRect(x,y,(x2-x),(y2-y));break;

case 4:repaint();break;

}}

}



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Output:



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Week:12

a) Write a Java program to create Multiple Threads

class MyThread extends Thread{MyThread(String s){super(s);start();

}public void run(){for(int i=0;i


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Week 12:

b) Write a java program to find the your Host IP Address

import java.net.*;

public class Ipaddress{public static void main(String args[]){try{InetAddress local= InetAddress.getLocalHost();System.out.println ("Local IP Address is : " + local);

}catch (UnknownHostException e){System.err.println ("Can't detect IP Address : " + e);

}}

}

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