Space invaders

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class Ship here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Ship extends Animal
{
    /**
     * Act - do whatever the Ship wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        checkKeyPress();

    }
    public void checkKeyPress()
    {
        if(Greenfoot.isKeyDown("Right"))
        {
            move(10);

        }
        else if (Greenfoot.isKeyDown("Left"))
        {
            move(-10);
        }
        else if ("space".equals(Greenfoot.getKey()))  
        {  
            fire(); 
        } 
    }

    public void fire()
    {
        Bullet b = new Bullet();//makes the bullet
        b.setRotation(getRotation());//sets the rotation of the bullet to be the same as the ship's
        getWorld().addObject(b, getX(), getY());
    }
}