Problem on java Applet

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Java

Hii,

I am currently working on java applet and i am encountered with a problem that If the window has the size of 800*480 (set with setSize()) the visible area stays small.My code so far is

import java.applet.Applet;
import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;

public class StartingClass extends Applet implements Runnable {
	@Override
	public void init() {
		setSize(800,480);
		
		setFocusable(true);
		Frame frame=(Frame)this.getParent().getParent();
		frame.setTitle("Q-Bot Alpha");
		setBackground(Color.BLACK);
		//frame.setBackground(Color.BLACK);

	}
	

	@Override
	public void start() {
		Thread thread = new Thread(this);
		thread.start();

	}

	@Override
	public void stop() {

	}

	@Override
	public void destroy() {

	}

	@Override
	public void run() {
		while (true) {
			repaint();
			try {
				Thread.sleep(17);
			} catch (InterruptedException e) {

				e.printStackTrace();
			}
		}

	}

}

what i am missing?