import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.util.*;
import java.awt.event.*;
import javax.swing.Timer;
 
public class ShootingTester extends JPanel implements KeyListener, ActionListener
{
    public static int WIDTH=800;
    public static int HEIGHT=600;
    private Font titleFont, regularFont;
    private int keyCode, x, y;
    private char c;
    private ArrayList<Bullet> bullets;
    private Timer timer;
 
    public ShootingTester()
    {
 
        //initialize variables here...
        titleFont = new Font("Roman", Font.BOLD, 18);
        regularFont = new Font("Helvetica", Font.PLAIN, 12);
        keyCode=0;
        c='-';
        x=75;
        y=550;
        bullets = new ArrayList<Bullet>();
        timer = new Timer(20, this); //1000=1 seconds
        //timer2 = new Timer(2000, this); //1000=1 seconds
        timer.start();
    }
    public static void main(String[] args) {
        ShootingTester app= new ShootingTester();
        JFrame window = new JFrame("Type a Key to See Its Code");
        window.setSize(WIDTH, HEIGHT);
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.getContentPane().add(app);
        window.addKeyListener(app);
        //window.pack();
        window.setVisible(true);
 
    }
    public void paintComponent(Graphics g){
        super.paintComponent(g);
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, getWidth(),getHeight());
        g.setColor(Color.BLUE);
        g.setFont(titleFont);
        g.drawString("Type a Key to See Its Code", 20, 20);
        g.setColor(Color.BLACK);
        g.setFont(regularFont);
        g.drawString("Version 1.0", 20, 40);
        g.drawString("the key char "+c+" has code "+keyCode, 20, 60);
        g.setFont(new Font("Arial", Font.PLAIN, 48));
        g.setColor(Color.red);
        g.drawString("\""+c+"\"",80, 120);
        g.setColor(Color.BLACK);
        g.fillRect(x,y, 20, 40);
        int i =0;
        while(i < bullets.size() ){
            bullets.get(i).draw(g);
            if (bullets.get(i).getY() < 0)
                 bullets.remove(i);
            else 
                  i++;
        }
 
    }
    // update is a workaround to cure Windows screen flicker problem
    public void update(Graphics g){
        paint(g);
    }
 
    // These 3 methods need to be declares to implement the KeyListener Interface
    @Override
    public void keyTyped(KeyEvent e) {}
 
    @Override
    public void keyPressed(KeyEvent e) 
    {
      keyCode=e.getKeyCode();
      c=e.getKeyChar();
      int delta = 5;
      if(keyCode == 37){
          //left
          x-=delta;
      } else if (keyCode ==38){
         // up
         y -= delta;
      } else if (keyCode ==39){
         // right
         x += delta;
      }else if (keyCode ==40){
         // down
         y += delta;
      } else if (keyCode ==32)
      {
 
 
          //space bar is fire
          bullets.add(new Bullet(x+10,y));
      }
      repaint();
    }
 
    @Override
    public void keyReleased(KeyEvent e) {}
    public void actionPerformed(ActionEvent e) {
 
         repaint();
    }
}

import java.awt.*;
 
 
public class Bullet
{
    // instance variables - replace the example below with your own
    private int x,y;
 
    /**
     * Constructor for objects of class bulliet
     */
    public Bullet(int x0, int y0)
    {
       x = x0;
       y = y0;
    }
 
    public int getY(){
        return y;   
    }
    public void draw(Graphics g)
    {
        // put your code here
        g.setColor(Color.RED);
        g.fillRect(x,y,3,8);
        y -= 4;
    }
}