SimpleGUI3.java

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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
public class SimpleGUI3 implements ActionListener {
    JFrame frame;
 
    public static void main(String[] args) {
        SimpleGUI3 gui = new SimpleGUI3();
        gui.go();
    }
 
    public void go() {
        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JButton button = new JButton("Change colors");
        button.addActionListener(this);
        MyDrawPanel2 drawPanel = new MyDrawPanel2();
        frame.add(button, BorderLayout.SOUTH);
        frame.add(drawPanel, BorderLayout.CENTER);
        frame.setSize(300, 300);
        frame.setVisible(true);
    }
 
    public void actionPerformed(ActionEvent event) {
        frame.repaint();
    }
}