Thread: Grass disappearing :(

For some reason when the "Grass" is drawn, it disappears immediately! I have no idea why this shouldn't work. It works perfectly when it's just the specified part of the code alone.

This is the full code which doesn't work, the green lines disappear immediately:

import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
 
public class Drawing4 extends Applet implements KeyListener{
	int PlayerX = 0;
	int PlayerY = 0;
	int GrassX = 5;
	public void init()
	{
		this.addKeyListener(this);
		resize(501, 502);
	}
	public void paint(Graphics g)
	{
		g.setColor(Color.green);
		while(GrassX < 500)
		{
			g.drawLine(GrassX, 0, GrassX, 500);
			GrassX = GrassX + 5;
		}
		g.setColor(Color.black);
		g.drawLine(0,0,500,0);
		g.drawLine(500,500,500,0);
		g.drawLine(500,500,0,500);
		g.drawLine(0,500,0,0);
		g.setColor(Color.red);
		g.fillRect(PlayerX, PlayerY, 10, 10);
	}
	public void keyPressed(KeyEvent arg0){}
	public void keyReleased(KeyEvent e) 
	{
		char key = e.getKeyChar();
		if(key == 'w')
		{
			PlayerY = PlayerY - 10;
		}
		if(key == 'a')
		{
			PlayerX = PlayerX - 10;
		}
		if(key == 's')
		{
			PlayerY = PlayerY + 10;
		}
		if(key == 'd')
		{
			PlayerX = PlayerX + 10;
		}
		repaint();
	}	
	public void keyTyped(KeyEvent arg0){}
}

But alone the code does work:

import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
 
public class testing extends Applet{
	public void init()
	{
		resize(501,501);
	}
	public void paint(Graphics g)
	{
		int GrassX = 5;
		g.setColor(Color.green);
		while(GrassX < 500)
		{
			g.drawLine(GrassX, 0, GrassX, 500);
			GrassX = GrassX + 5;
		}
	}
}

Aha! Thanks!