openthink labs training : diving into java, breaking the surface

#1

Day #1

Breaking the Surface

A Quick Dip

Wildan Maulanawildan.m@openthinklabs.com

http://training.openthinklabs.com/

Come on, the water'sgreat! We'll dive right in and

write some code, then compile andrun it. We're talking syntax, loopingand branching, and a look at what

makes Java so cool. You'll becoding in no time.

The Way Java Works

What you'll do in Java

Avery brief history of Java

Look how easy Itis to write Java.

int size = 27;String name = UFido";Dog rnyDog = new Dog(name, size);x = size – 5 ;if (x < 15) myDog.bark(8);while (x > 3) { myDog.play();}int [ ] numList = {2,4,6,8};System. out. print (“Hello” ) ;System.out.print(“Dog: “ + name);String nurn = “8";int Z = Integar.parselnt(nurn);try { readTheFile(“myFile.txt”) ;}catch(FileNotFoundException ex) { System.out.print(“File not found.");}

Code structure in Java

Anatomy of a class

Writing a class with a main

What can you say In the main method ?

Syntax Fun

Looping and Looping and ...

Bullet Points● Statements end in a semicolon ;

● Code blocks are defined by a pair of curly braces { }

● Declare an int variable with a name and a type: int x;

● The assignment operator Is one equals sign =

● The equals operator uses two equals signs ==

● A while loop runs everything within its block (defined by curly braces) as long as the conditional test Is true.

● If the conditional test is false, the while loop code block won't run, and execution will move down to the code Immediately after the loop block.

● Put a boolean test Inside parentheses: while (x = 4) ( }

Conditional Branching

Sharpen Your Pencil

Coding a Serious Business Application

Monday Morning at Bob's

…...

Let's Write a Program

Reference

● Kathy Sierra & Bert Bates; Head First Java 2nd Edition, O'Reilly, 2002