点击面板上的按钮，改变相应的颜色_编程色块点击变色-优快云博客

本文链接：https://blog.youkuaiyun.com/tdy002/article/details/7327426

本文介绍了一个使用Java Swing实现的简单示例程序，通过点击不同颜色的按钮来改变面板背景色。程序中利用了按钮事件监听器来响应用户交互。

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package swing;

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

/**
* 点击面板上的按钮，改变相应的颜色
*
* 1.都是用字符串构造button
* 2.都是将该button添加到panel
* 3.都是用对应的颜色构造一个监听器
* 4.都会添加监听器动作
*/
public class ButtonTest {
public static void main(String[] args) {
  EventQueue.invokeLater(new Runnable() {
   @Override
   public void run() {
    ButtonFrame frame = new ButtonFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
   }
  });
}
}

class ButtonFrame extends JFrame {
public ButtonFrame() {
  this.setTitle("Button Test");
  this.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

  buttonPanel = new JPanel();

  this.makeButton("Yellow", Color.YELLOW);
  this.makeButton("Blue", Color.BLUE);
  this.makeButton("Red", Color.RED);

  //将panel添加至frame
  this.add(buttonPanel);
}

private void makeButton(String name, final Color backgroundColor) {
  JButton button = new JButton(name);
  buttonPanel.add(button);
  button.addActionListener(new ActionListener() {
   @Override
   public void actionPerformed(ActionEvent event) {
    buttonPanel.setBackground(backgroundColor);
   }
  });
}

public static final int DEFAULT_WIDTH = 300;
public static final int DEFAULT_HEIGHT = 200;

private JPanel buttonPanel;
}