When I run my Java program my screen is blank.

[kingofdrew]

I don't know why but nothing is appearing?

I suppose to have a applet of a house.

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.*;
import java.applet.Applet;
import java.awt.Graphics;


public class color extends JApplet
{
	public void init()
	{
		addMouseListener(new MyMouseListener());
		getContentPane().setBackground(Color.white);
	}
	public class MyMouseListener implements MouseListener
	{
	public void mouseClicked(MouseEvent e) 
	{
	       int x = e.getX();
	       int y = e.getY();
	       boolean closeDoors = true;
	       
	       if(x>330 && x<280 && y>20 && y<20)
	       {
	    	   closeDoors = false;
	           repaint();
	      
	       }
	      
	}
	public void mouseEntered(MouseEvent e) { }
	public void mouseExited(MouseEvent e) { }
	public void mousePressed(MouseEvent e) { }
	public void mouseReleased(MouseEvent e) { }
	}
	public void paint ( Graphics g, boolean closeDoors)
	       {
	    	    super.paint (g);
	    	  
	    	    do
	    	    {
	    	   g.drawLine (35, 50, 570, 50);
				g.drawLine (35, 50, 250, 0);
				g.drawLine (250, 0, 570, 50);
				g.drawRect (50, 50, 500, 350);
				g.fillRect (100, 75, 80, 80);
				g.fillRect (400, 75, 80, 80);
				g.fillRect (240, 200, 125, 200);
	    	    }
				 while (closeDoors = true);
				 
				 if (closeDoors = false);
				{
				g.drawLine (35, 50, 570, 50);
				g.drawLine (35, 50, 250, 0);
				g.drawLine (250, 0, 570, 50);
				g.drawLine (180, 120, 100, 120);
				g.drawLine (400, 120, 480, 120);
				g.drawLine (140, 75, 140, 160);
				g.drawLine (450, 75, 450, 160);
				g.drawRect (50, 50, 500, 350);
				g.drawRect (100, 75, 80, 80);
				g.drawRect (400, 75, 80, 80);
				g.drawRect (240, 200, 125, 200);
				g.drawOval (330,280, 20, 20);
				}
	    	}
}

[JamesCherrill]

if(x>330 && x<280 && y>20 && y<20)

x cannot be both >300 and <280 at the same time
similarly, y cannot be greater than and less than 20 at the same time

so this will always evaluate to false, for all possible values of x and y

[mangopearapples]

I think you need y == 20?

[JamesCherrill]

I think you need y == 20?

Unlikely.
@kingofdrew needs to have another look at how && works.
Also
public void paint ( Graphics g, boolean closeDoors)
is probably a mistake. It looks like a failed attempt to override the inherited
public void paint ( Graphics g)
but because of the additional parameter this is just an ordinary method, not an override, and it doesn't get called anywhere.