制作 1 个单个 JButton 更改面板背景

Question

快速问题 您将如何使 1 JButton在单击时更改面板的颜色并显示它的颜色我做过一些教程，当单击不同的按钮时，有 3 个JButtons颜色变化，但你如何只做一个JButton更改面板颜色，例如黄色、绿色和红色。

import javax.swing.*;
import java.awt.event.*;
   public class ChangeButtonColor{
   JButton button;
   public static void main(String[] args){
   ChangeButtonColor cl = new ChangeButtonColor();
  }
   public ChangeButtonColor(){
      JFrame frame = new JFrame("Change JButton Color");
      JPanel panel = new JPanel();
      button = new JButton();
      button.addActionListener(new MyAction());
      frame.add(button);
      frame.setSize(400, 400);
      frame.setVisible(true);
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 }
  public class MyAction implements ActionListener{
  public void actionPerformed(ActionEvent e){

   }
 }
}

Answer 1

"也许我可以做例如，当按钮被单击时（如果面板颜色是红色打印出红色，否则如果面板是绿色打印出绿色）那会很好吗"

您可以检查if (panel.getBackground() == Color.RED)，例如

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ColorClick {
    public static void main(String[] args) {
        final JPanel panel = new JPanel(new GridBagLayout()) {
            {
                setBackground(Color.RED);
            }
            @Override
            public Dimension getPreferredSize() {
                return new Dimension(200, 200);
            }
        };
        JButton button = new JButton("Change Color");
        button.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                if (panel.getBackground() == Color.RED) {
                    System.out.println("RED");
                    panel.setBackground(Color.GREEN);
                } else if (panel.getBackground() == Color.GREEN) {
                    System.out.println("GREEN");
                    panel.setBackground(Color.RED);
                }
            }
        });
        panel.add(button);
        JOptionPane.showMessageDialog(null, panel);
    }
}