Question

用java编写程序，单击按钮后改变按钮上的图标，(两个图标的改变

Answer 1

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class ImageButton extends JFrame implements ActionListener{
JButton jb;
ImageIcon img1 = new ImageIcon("D:\\1.jpg");
ImageIcon img2 = new ImageIcon("D:\\2.jpg");
public ImageButton()
{
jb = new JButton();
jb.setIcon(img1);
jb.addActionListener(this);
JPanel jp = new JPanel();
jp.add(jb);
add(jp);
setSize(400,400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e)
{
if(jb.getIcon() == img1) jb.setIcon(img2);
else jb.setIcon(img1);
}
public static void main(String[] args)
{
new ImageButton().setVisible(true);
}
}

在D盘下放两张名 为1.jpg 和 2.jpg的图片

Answer 2

按钮 添加监听，点击事改变图片