Something

import java.awt.Graphics;

import javax.swing.JComponent;
import javax.swing.JFrame;


public class Test extends JComponent
{
	int width, height;
	public Test()
	{
		width = 100;
		height = 100;
		JFrame f = new JFrame("Memory");
		f.setDefaultCloseOperation(f.EXIT_ON_CLOSE);
	    f.setVisible( true );
	    f.setSize(width,height);
		f.add(this);
	}
	
	public void paint(Graphics g)
	{
		g.drawRect(0, 0, width, height);
	}

	public static void main(String[] args) 
	{
		Test test = new Test();
	}

}