Prevent JButton repaint() after click

Question

I have a button. I want to change the background after I click on it. My problem here is the button auto call paintComponent(). How can prevent this? I expect after

Answer 1

If you want to change the background for a short while you can do it with swing Timer:

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

public class ButtonDemo extends JButton implements ActionListener{

    private static final int DELAY = 600; //milliseconds
    private final Timer timer;

    public ButtonDemo() {
        this.setText("BUTTON TEXT");
        this.addActionListener(this);
        Color defaultCloor = getBackground();
        timer = new Timer(DELAY, e-> setBackground(defaultCloor));
        timer.setRepeats(false);
    }

    public static void main(String[] args){
        JFrame frame = new JFrame();
        JPanel contentPane = new JPanel();
        frame.setContentPane(contentPane);
        contentPane.add(new ButtonDemo());
        frame.setSize(300, 200);
        frame.setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        timer.stop();
        this.setBackground(Color.RED);
        timer.start();
    }
}