Java程序设计例子源代码.doc
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Java 2程序设计
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Java程序设计概述
例子1：第一个Java程序
public class H ello {
public static void main (String args[ ]) {
System.out.println(你好，很高兴学习Java);
}
}
例子2：第二个java程序
class People {
int height;
String ear;
void speak(String s)
{ System.out.println(s);
}
}
public class A {
public static void main(String args[]) {
People zhubajie;
zhubajie=new People();
zhubajie.height=170;
zhubajie.ear=两只大耳朵;
System.out.println(身高:+zhubajie.height);
System.out.println(zhubajie.ear);
zhubajie.speak(师傅，咱们别去西天了，改去月宫吧);
}
}
例子3：Applet程序（由AppletTest.class和AppletTest.html组成）
import java.applet.*;
import java.awt.*;
public class AppletTest extends Applet {
public void paint(Graphics g) {
g.setColor(Color.red);
g.drawString(我一边喝着咖啡，一边学Java呢,5,30);
g.setColor(Color.blue);
g.drawString(我学得很认真,10,50);
}
}
// AppletTest.html
html
head
titleApplet test example/title
/head
body
h1This is a applet example/h1
hr
applet code= AppletTest.class width=800 height=600
/applet
hr
a href= AppletTest.javaThe source/a.
/body
/html
例子4：Java图形用户界面例子
//JavaGUI.java
import java.awt.FlowLayout;
import java.awt.event.*;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
/**
* @author 同步计算输入的各个数的总和与平均值
*/
public class JavaGUI extends JFrame {
private static final long serialVersionUID = 6515574844960224544L;
JTextField input = new JTextField(30);
JTextField output = new JTextField(30);
JButton close = new JButton(关闭);
JButton reset = new JButton(清空);
public JavaGUI() {
setupGUI();
}
public void setupGUI() {
this.setTitle(计算总和与平均值);
this.setLayout(new FlowLayout());
this.add(new JLabel(数据));
this.add(input);
this.add(new JLabel(结果));
this.add(output);
this.add(close);
this.add(reset);
setSize(400, 130);
input.addKeyListener(
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