import javax.swing.*;
import java.awt.*;
import java.io.*;
import javax.imageio.*;
import java.awt.event.*;
 
public class Invader extends JPanel{
 
    private Image sprite;
    private int spriteW;
    private int spriteH;
    private int speedX = 5;
    private int speedY = 8;
    private Point invPos;
    private boolean alive = true;
    private boolean hitright = false;
    private boolean hitleft = false;
	private boolean landed = false;
	static final int RIGHT = 1;
	static final int LEFT = 0;
	private int rightEdge;
	private int leftEdge;
	private int top;
	private int bottom;
	private int lives = 5;
	private int spriteCount = 1;
 
    public Invader()
    {
        this.addKeyListener(new KeyboardListener());
        this.setFocusable(true);
        invPos = new Point(110, 20);
        rightEdge = 256 - getSpriteW();
        setBoundaries(0, 208, 224, 395);
        start();
    }
 
    public void paintInv()
    {
        try{            
            sprite = ImageIO.read(new File("Invader" + spriteCount + ".png"));
            spriteW = sprite.getWidth(this);
            spriteH = sprite.getHeight(this);
        }
        catch(Exception e){
            System.out.println("File not found");
        }
    }
 
    public boolean dead()
    {
        return !alive;
    }
 
    public Point where()
    {
        return invPos;
    }
 
	public void checkPosition()
	{
		if (invPos.x < leftEdge )
		{
			invPos.x = leftEdge;
			if (!hitleft)
			{
				hitleft = true;
				hitright = false;
				invPos.y += speedY;
			}
		}
 
		if (invPos.x > rightEdge )
		{
			invPos.x = rightEdge;
			if (!hitright)
			{
				hitright = true;
				hitleft = false;
				invPos.y += speedY;
			}
		}
 
		if (invPos.y > bottom)
		{
			invPos.y = bottom;
			landed = true;
		}
	}
 
	public void moveInvader(int direction)
	{
		if (alive && !landed)
		{
			if (direction == LEFT)
			{
				invPos.x -= speedX;
			}
 
			else
			{
				invPos.x += speedX;
			}
 
			checkPosition();
			repaint();
		}
	}
 
	public void setBoundaries(int l, int r, int t, int b)
	{
		leftEdge = l;
		rightEdge = r;
		top = t;
		bottom = b;
	}
 
    public void paintComponent(Graphics g)//Paint the panel component
    {    
    	Graphics2D g2 = (Graphics2D) g;
        if(alive)
        {
            g.drawImage(sprite,invPos.x,invPos.y, this);
            spriteCount++;
 
            if(spriteCount == 4)
            {
            	spriteCount = 1;
            }
 
           	start();
        }
 
        else
        {
            g.setColor(Color.white);
            g.drawString("You Are Dead", 100, 100);
        }
    }
 
	public void setSpriteW(int spriteW) 
	{
		this.spriteW = spriteW;
	}
 
	public int getSpriteW() 
	{
		return spriteW;
	}
 
    public class KeyboardListener implements KeyListener
    {
        public void keyReleased(KeyEvent k)
        {
        }
 
        public void keyPressed(KeyEvent k)
        {
			int code = k.getKeyCode();
			if (code == KeyEvent.VK_LEFT)
				moveInvader(LEFT);
			if (code == KeyEvent.VK_RIGHT)
				moveInvader(RIGHT);
        }
 
        public void keyTyped(KeyEvent k)
        {\
        }
    }
 
	public void start()
	{
		for(int i=0; i<20; i++)
		{
			repaint();
			paintInv();	
		}
	}
 
 }

import javax.swing.*;
import java.awt.*;
import java.io.*;
import javax.imageio.*;
import java.awt.event.*;
 
public class SpaceFrame{
 
 	public static void main(String[] args){
		JFrame jf = new JFrame("The Last Space Invader");
		AlienLandingPanel alp = new AlienLandingPanel();
		jf.add(alp);
		jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		jf.setSize(256, 512);
		jf.setVisible(true);
	}
}

import javax.swing.*;
import java.awt.*;
import java.io.*;
import javax.imageio.*;
import java.awt.event.*;
 
public class AlienLandingPanel extends JPanel implements Runnable{
 
	private Thread t;
	private Invader inv;
	private Tank tank;
	//private Missile miss;
	private Image backImg;
	boolean changed = true;
	String score;
	String lives;
	int livesRem = 10; 
 
	public AlienLandingPanel() {
 
        inv = new Invader();
        add(inv);
        tank = new Tank();
        try{
            backImg = ImageIO.read(new File("back.jpg"));
        }
        catch(Exception e)
        {
            System.out.println("Not found");
        }
        t = new Thread(this);
        t.start();
    }
 
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(backImg, 0, 0, this);
        inv.paintComponent(g);
        tank.paintComponent(g);
    }    public void run()
    {
        try{
            while(!inv.dead())
            {
                Thread.sleep(50);          
                Point p = inv.where();
                tank.moveTank(p.x);
                repaint();
            }
        }
 
 
        catch(InterruptedException inter)
        {
 
        }
    }
 
}