Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.AlphaComposite;
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.Timer;

public class Main {
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new BorderLayout());
        frame.add(new BlinkPane());
        frame.setSize(200, 200);
        frame.setVisible(true);
    }
}

class BlinkPane extends JLabel {
    JLabel label;
    boolean on = true;

    public BlinkPane() {
        label = new JLabel("Hello");
        setLayout(new GridBagLayout());

        add(label);
        Timer timer = new Timer(1000, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                on = !on;
                repaint();
            }
        });
        timer.setRepeats(true);
        timer.setCoalesce(true);
        timer.start();
    }

    @Override
    public void paint(Graphics g) {
        Graphics2D g2d = (Graphics2D) g.create();
        if (!on) {
            g2d.setComposite(AlphaComposite.SrcOver.derive(0f));
        } else {
            g2d.setComposite(AlphaComposite.SrcOver.derive(1f));
        }
        super.paint(g2d);
        g2d.dispose();
    }

}