10例子12.txt

来自「这是一本java基础教程 对新手上路有很大帮助」· 文本 代码 · 共 32 行

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*;
public class Example10_12{
    public static void main(String args[]){
        new ImageWin();
    }
}
class ImageWin extends JFrame{
    JButton button;
    int i=0; 
    Icon icon1,icon2;
    ImageWin(){
        icon1=new ImageIcon("a.jpg");
        icon2=new ImageIcon("b.jpg");
        button=new JButton(icon1);
        button.setMnemonic('d') ;
        add(button,BorderLayout.CENTER); 
        validate();
        button.addActionListener(new ActionListener(){
                                  public void actionPerformed(ActionEvent e){
                                     i=(i+1)%2;
                                     if(i==1)  button.setIcon(icon2); 
                                     else     button.setIcon(icon1);
                                  } 
                             });
        setBounds(100,100,300,200);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}