2D图形画不出来

import java.awt.*;

import java.awt.geom.Rectangle2D;

import javax.swing.*;



public class DrawTest

{

	public static void main(String[] args)

	{

		DrawFrame frame=new DrawFrame();

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		frame.setVisible(true);

	}

}



class DrawFrame extends JFrame

{

	public DrawFrame()

	{

		setSize(Width,Height);

		setTitle("DrawTest");

		setLocation(500, 300);

		

		DrawPanel panel=new DrawPanel();

		add(panel);

	}

	

	public static final int Width=400;

	public static final int Height=500;



}



class DrawPanel extends JPanel

{

	public void paintComponet(Graphics g)

	{



		super.paintComponent(g);

		Graphics2D g2=(Graphics2D)g;

		

		//画一个方块

		Rectangle2D rect=new Rectangle2D.Double(100,100,200,150);

		g2.draw(rect);

	}

}