Programmingsite : source code

the very first program

hello world in java

public class HelloWorld { public static void main(String[]args) { System.out.println("Hello World!"); } }

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ask the user for their name and then display it

user interaction

import javax.swing.*;

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

String name;

name = JOptionPane.showInputDialog("Type in your name: "); System.out.println(name);

System.exit(0); } }

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a first applet

a first applet

/* applet source code compile as normal */

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

public class HelloWorld extends Applet { public void paint(Graphics g) { g.drawString("Hello world"

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an example which shows if else control structures

if / else grades example

import javax.swing.*;

public class grades { public static void main(String[] args) { String result; int testscore = 0; char grade; result = JOptionPane.showInputDialog("Type in your grade: "); testscore = Integer.parseInt(result);

if (testscore >= 90) { grade = ‘A’; } else if [...]

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another beep example

another beep example

import java.awt.*; public class beep { public static void main(String args[]) { Toolkit.getDefaultToolkit().beep(); } }

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