制作1个单独的JButton更改面板背景

Question

Quick question how would you make 1 JButton change the color of the panel when clicked and displays what color it is I've done some tutorials having 3 JButtons color change when a different button is clicked but how you make just one JButton change the panel color for example yellow, green, and red.

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

"maybe i could do for example when the button is clicked (if panel color is red print out red , else if panel is green print out green) would that be good"

You can just check if (panel.getBackground() == Color.RED) , for example

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);
    }
}