Java Code

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class MiniGame extends JApplet implements Runnable, KeyListener
{
	AnimateSprite user;
	AnimateSprite monster, troll;
	Coins ten, twenty;
	Thread thread;
	Random random;
	public void init( )
	{
		random = new Random( );
		user = new AnimateSprite( );
		user.setImage( getImage( getCodeBase( ), "player.gif" ));
		monster = new AnimateSprite( );
		monster.setImage( getImage( getCodeBase( ), "monster.gif" ) );
		monster.setLocation( 250,250 );
		troll = new AnimateSprite( );
		troll.setImage( getImage( getCodeBase( ), "troll.gif" ));
		troll.setLocation( 350,350);
		setupCoins( );
		setFocusable(true);
		addKeyListener( this );
		thread = new Thread( this );
		thread.start( );
	}
	public void setupCoins( )
	{
		ten = new Coins( 10 );
		twenty = new Coins( 20 );
		ten.setLocation( 400,350 );
		twenty.setLocation( 450, 50 );
		ten.setImage( getImage( getCodeBase( ), "coins.gif" ));
		twenty.setImage( getImage( getCodeBase( ), "coins.gif" ));
	}
	public void keyPressed( KeyEvent ke )
	{
		int key = ke.getKeyCode( );
		if ( key == KeyEvent.VK_UP )
			user.moveUp( );
		else if ( key == KeyEvent.VK_DOWN )
			user.moveDown( );
		else if ( key == KeyEvent.VK_LEFT )
			user.moveLeft( );
		else if ( key == KeyEvent.VK_RIGHT )
			user.moveRight( );
	}
	public void keyReleased( KeyEvent ke ) { }
	public void keyTyped( KeyEvent ke ) { }
	public void update( Graphics g ) { paint( g ); }
	public void paint( Graphics g )
	{
		g.clearRect( 0,0, this.getWidth(), this.getHeight() );
		ten.paintComponent( g );
		twenty.paintComponent( g );
		monster.setLocation( random.nextInt(10)-5+monster.x, 
										random.nextInt(10-5+monster.y) );
		monster.paintComponent( g );
		user.paintComponent( g );
		if ( user.intersects( monster ) )
		{
			boolean alive = user.hit( monster.weaponDamage );
			if ( ! alive )
			{
				g.setFont( new Font( "Serif", Font.BOLD, 26 ) );
				g.drawString( "YOU LOSE!", 20,100 );
				thread.interrupt( );	// stop thread, game is over
			}				
		}
	}
	public void run( )
	{
		try
		{
			while( true )
			{
				repaint( );
				Thread.sleep(10);
			}
		} catch( Exception e ) { }
	}
}

import java.awt.*;
import javax.swing.*;
public class Sprite 
{
    Image image;
    int x, y;
    boolean isVisible;
    public Sprite( )
    {
		isVisible = false;
		image = null;
    }
    public Sprite( Image i )	
    {
		isVisible = true;
		image = i;
        x = 10;
        y=10;
    }
    public void setImage( Image img )
    {
		image = img;
		isVisible = true;
    }
    public void setLocation( int _x, int _y )
    {
		x = _x;  
		y = _y; 
    }
    public Rectangle getDimensions( )
    {
		return new Rectangle( x, y, image.getWidth(null), image.getHeight(null) );
    }
    public boolean intersects( Sprite s )
    {
		return getDimensions( ).intersects( s.getDimensions( ) );
    }
    public void setVisible( boolean vis )
    {
		isVisible = vis;
    }
    public void paintComponent( Graphics g )
    {
		if ( isVisible )
			g.drawImage( image, x, y, null );
    }
}

import java.awt.*;
import javax.swing.*;
public class Coins extends Sprite
{
    int amount;
    public Coins( int amt )
    {
		amount = amt;
    }
    public int getAmount( )
    {
		return amount;
    }
    public void setAmount ( int amt )
    {
		amount = amt;
    }
}

import java.awt.*;
import javax.swing.*;
public class AnimateSprite extends Sprite
{
    int speed=5;    
    int directionX = 1, directionY = 1;
    int healthPoints = 100;
    int weaponDamage = 10;
    final boolean DEAD = false;
    final boolean ALIVE = true;
    public void moveUp( )
    {
		y -= speed;
    }
    public void moveDown( )
    {
		y += speed;
    }
    public void moveLeft( )
    {
		x -= speed;
    }
    public void moveRight( )
    {
		x += speed;
    }
    public int getHealthPoints( )
    {
		return healthPoints;
    }
    public void setHealthPoints( int hp )
    {
		healthPoints = hp;
    }
    public boolean hit( int amt )
    {
		healthPoints -= amt;
		if ( healthPoints < 0 )
			return DEAD;
		else
			return ALIVE;
    }
}