how to reload

import greenfoot.*;
import greenfoot.MouseInfo;

public class Player extends Actor
{
    // all the variables for the players stats
    public final int speed = 3;
    public int firerate = 20;
    int health = 100;
    int stamina = 10;
    int cash = 0;
    int wave = 1;
    int ammo = 20;
    public int pause = 100;
    int kills = 0;
    int survivedTime = 0;
    // creates the player character
    public Player(){
        setImage(new GreenfootImage(70, 50));
        getImage().setColor(Color.YELLOW);
        getImage().fillOval(0, 0, 50, 50);
        getImage().setColor(Color.BLACK);
        getImage().fillRect(50, 20, 70, 10);
    }
    // tells the player character to use all the methods that have been created as long as the conditions are right for the given method
    public void act()
    {
        move();
        turnAround();
        reload();
        shoot();
        
    }
    // tells the actor to turn to face the mouse
    public void turnAround(){
        button button = new button();
        if (Color.BLACK.equals(button.getCurrentColor())){
            if(Greenfoot.getMouseInfo() != null){
                turnTowards(Greenfoot.getMouseInfo().getX(), Greenfoot.getMouseInfo().getY());
            }
        }
    }
    // tells the actor to do if the button is black and if it isnt black
     public void shoot() {
        button button = new button();
        if (Color.BLACK.equals(button.getCurrentColor())){
            manualShoot();            
        } 
        else {
            autoShoot();
        }
    }
    // returns the buttons color to determine what the firemode is
    public static int getColor()
    {
        return button.colorValue;
    }
    // one of the firemodes that is player skilled based 
    private void manualShoot()
    {        
        MouseInfo mouse = Greenfoot.getMouseInfo();
        if(pause>0){
                pause --;
            }
        if(pause == 0){
                if(ammo>0){
                    if (!Greenfoot.mousePressed(null)) return;
                    turnTowards(mouse.getX(),mouse.getY());
                    Actor bullet = new bullet();
                    getWorld().addObject(bullet, getX(), getY());
                    bullet.turnTowards(mouse.getX(), mouse.getY());
                    GreenfootImage drawedImage = new GreenfootImage("gunshot.png");//the image that is drawed;
                    getImage().drawImage(drawedImage, 70, 50);
                    ammo--;
                    
                }
                pause = firerate;
        }                       
    }
    // the second fire mode that is more of a auto fire to the nearest enemy
    private void autoShoot()
    {        
        if(pause>0){
            pause --;
        }
        if(pause == 0){
            if(ammo>0){
                if (getWorld().getObjects(Zombie.class).isEmpty()) return;
                Actor closest = null;
                int closeness = 9999;
                for (Object obj : getWorld().getObjects(Zombie.class)) {
                    Actor enemy = (Actor)obj;
                    int dist = (int)Math.hypot(getX()-enemy.getX(), getY()-enemy.getY());
                    if (dist < closeness) {
                        closeness = dist;
                        closest = enemy;
                    }
                    Actor bullet = new bullet();
                    getWorld().addObject(bullet, getX(), getY());
                    bullet.turnTowards(closest.getX(), closest.getY());
                }
                GreenfootImage drawedImage = new GreenfootImage("gunshot.png");//the image that is drawed;
                getImage().drawImage(drawedImage, 70, 50);
                ammo--;
                pause = firerate;
            }
        }        
    }
    // gets the users inputs and moves the player accordingly
    public void move(){
        if(Greenfoot.isKeyDown("W")||Greenfoot.isKeyDown("UP")){
            setLocation( getX(), getY()-speed);
        }
        if(Greenfoot.isKeyDown("A")||Greenfoot.isKeyDown("LEFT")){
            setLocation( getX()-speed, getY());
        }
        if(Greenfoot.isKeyDown("S")||Greenfoot.isKeyDown("DOWN")){
            setLocation( getX(), getY()+speed);
        }
        if(Greenfoot.isKeyDown("D")||Greenfoot.isKeyDown("RIGHT")){
            setLocation( getX()+speed, getY());
        }
    }
    // tells the character to reload his gun when the user hits r
    private void reload(){
        if((Greenfoot.isKeyDown("R"))){
            pause = firerate;
            if(pause>0){
                pause --;
            }
            if(pause == 0){
                ammo = 20;
            }
        }                
    }
}