Java初學者的小實驗，有源碼哦

題目：

編寫一個程序，創建一個AWT面板，該面板包含三個不同顏色名稱的三個按鈕，單擊每個按鈕時應使窗口的背景顏色顯示為相應的顏色。程序運行的結果如下：

圖一

圖二

圖三

圖四

源程序如下：

import java.awt.*;

import java.awt.event.*;

import javax.swing.JButton;

class ChangeBgColor extends Frame implements ActionListener {

private static final long serialVersionUID = 1L; Panel p;

JButton btn1,btn2,btn3; ChangeBgColor() {

p = new Panel(); btn1 = new JButton("紅色");

btn1.setBackground(Color.red ); btn2 = new JButton("藍色");

btn2.setBackground(Color.blue);

btn3 = new JButton("黃色");

btn3.setBackground(Color.yellow); this.add(p); p.add(btn1); p.add(btn2); p.add(btn3);

btn1.addActionListener(this); btn2.addActionListener(this); btn3.addActionListener(this); }

public static void main(String args[]) {

ChangeBgColor mainFrame = new ChangeBgColor(); mainFrame.setTitle("基本GUI 編程"); mainFrame.setSize(400, 400);

mainFrame.setLocation(100, 100);

mainFrame.setBackground(Color.black); mainFrame.setVisible(true);

mainFrame.addWindowListener(new MyClosing()); }

public void actionPerformed(ActionEvent e) {

if (e.getSource() == btn1) {

p.setBackground(Color.red); }

else if(e.getSource() == btn2) {

p.setBackground(Color.blue); } else

p.setBackground(Color.yellow); } }

class MyClosing implements WindowListener {

public void windowActivated(WindowEvent e) { }

public void windowClosed(WindowEvent e) { }

public void windowClosing(WindowEvent e) {

System.exit(0); }

public void windowDeactivated(WindowEvent e) { }

public void windowDeiconified(WindowEvent e) { }

public void windowIconified(WindowEvent e) { }

public void windowOpened(WindowEvent e) { } }

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