Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.image.BufferedImage;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Main {

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame f = new JFrame();
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.add(new MyPanel());
                f.pack();
                f.setVisible(true);
            }
        });
    }
}

class MyPanel extends JPanel {
    int W = 800;
    int H = 600;

    public MyPanel() {
        this.setLayout(new GridLayout());
        this.setPreferredSize(new Dimension(W, H));
        int w = W / 2;
        int h = H / 2;
        int r = w / 5;
        BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = bi.createGraphics();
        g.setColor(Color.gray);
        g.fillRect(0, 0, w, h);
        g.setColor(Color.blue);
        g.fillRect(w / 2 - r, h / 2 - r / 2, 2 * r, r);
        g.dispose();
        this.add(new JLabel(new ImageIcon(bi), JLabel.CENTER));
    }

}