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<>点击按钮切换面板背景颜色
import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent;
import java.awt.event.ActionListener; public class colorTransformation extends
JFrame { public colorTransformation(){ this.setSize(500,500); this.setLocation(
100,100); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.
setLocationRelativeTo(null); this.setTitle("背景颜色变换"); this.setResizable(false);
this.setIconImage(new ImageIcon("zhaopian").getImage()); JPanel jp = new JPanel(
); JButton jb = new JButton("红色"); JButton jb1 = new JButton("绿色"); JButton jb2
= new JButton("蓝色"); JButton jb3 = new JButton("复原"); jp.add(jb); jp.add(jb1);
jp.add(jb2); jp.add(jb3); this.add(jp); this.setVisible(true); jb.
addActionListener(new ActionListener() { @Override public void actionPerformed(
ActionEvent e) { jp.setBackground(Color.RED); } }); jb1.addActionListener(new
ActionListener() { @Override public void actionPerformed(ActionEvent e) { jp.
setBackground(Color.GREEN); } }); jb2.addActionListener(new ActionListener() {
@Override public void actionPerformed(ActionEvent e) { jp.setBackground(Color.
BLUE); } }); jb3.addActionListener(new ActionListener() { @Override public void
actionPerformed(ActionEvent e) { jp.setBackground(null); } }); } public static
void main(String[] args) { new colorTransformation(); } }