DrawingPanel

Hej.
Er der nogen der kan se hvorfor dette simple program ikke virker:

Kode 

import java.awt.*;

public class DrawLine2 {
		public static void main(String[] args){
			DrawingPanel panel = new DrawingPanel(200, 100);
			
			Graphics g = panel.getGraphics();
			g.drawLine(25, 75, 100, 25);
			g.drawLine(100, 25, 175, 75);
			g.drawLine(25, 75, 175, 75);
		}
		
	}

Compileren giver en fejl ved:
new DrawingPanel(200, 100);

som siger:
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
DrawingPanel cannot be resolved to a type
DrawingPanel cannot be resolved to a type

at DrawLine2.main(DrawLine2.java:5)



På forhånd tak for hjælpen