import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.Graphics;
import java.awt.Color;

class Program04 extends JFrame {
	SajatGomb gomb = new SajatGomb();
	Program04() {
		gomb.setLocation(25, 25);
		gomb.setSize(100, 30);
		
		this.setLayout(null);
		this.add(gomb);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setSize(400, 300);
		this.setVisible(true);
	}
	public static void main(String args[]) {
		new Program04();
	}
}
class SajatGomb extends JButton {
	@Override
	public void paintComponent(Graphics g) {
		super.paintComponent(g);
		g.setColor(Color.BLUE);
		g.fillRect(5, 5, 10, 10);
	}	
}