?? buttonclick2.java
字號:
//ButtonClick2.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ButtonClick2
{
public static void main(String[] args)
{
ButtonFrame frame = new ButtonFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
}
class ButtonFrame extends JFrame
{
public ButtonFrame()
{
setTitle("ButtonClick2");
setSize(WIDTH, HEIGHT);
// 將panel加入到frame
ButtonPanel panel = new ButtonPanel();
Container contentPane = getContentPane();
contentPane.add(panel);
}
public static final int WIDTH = 300;
public static final int HEIGHT = 200;
}
class ButtonPanel extends JPanel
implements ActionListener
{
public ButtonPanel()
{
//創建按鈕
Button1 = new JButton("按鈕一");
Button2 = new JButton("按鈕二");
//將按鈕加入panel
add(Button1);
add(Button2);
//注冊監聽器
Button1.addActionListener(this);
Button2.addActionListener(this);
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
//顯示用戶的點擊操作
g.drawString("您點擊的是:" + ButtonText, 90, 120);
}
public void actionPerformed(ActionEvent event)
{
Object source = event.getSource();
if (source == Button1) ButtonText = "按鈕一";
else if (source == Button2) ButtonText = "按鈕二";
repaint();
}
private JButton Button1;
private JButton Button2;
public String ButtonText = "";
}
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