public class player extends Mover
{ 
    private int vSpeed = 0;
    private int jumpStrength= 26;
    private static final int acceleration = 2;

    /**
     * Act - do whatever the player wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        checkKeys();
        gameOver();
        checkFall();
        win();
    }    

    private void checkKeys()
    {
        if (Greenfoot.isKeyDown("right"))
        {
            move(10); 
        }
        if (Greenfoot.isKeyDown("left"))
        {
            move(-10); 
        }
        if (Greenfoot.isKeyDown("space"))
        {  

            if (onGround()||onGround2()||onGround3()||onGround4()||onGround5()
            ||onGround6()) {
                jump();
            }
        } 
    }

    public void setVSpeed(int speed)
    {
        vSpeed = speed;   
    }

    public void fall()
    {
        setLocation(getX(), getY() +vSpeed);
        vSpeed=vSpeed+acceleration;

    }

    public void gameOver()
    {
        if ( isTouching(Blackline.class) )
        {
            setLocation(40, 530);
        }
    }

    public void jump()
    {
        setVSpeed(-jumpStrength);
        fall(); 
    }

    public void checkFall()
    {
        if (onGround()||onGround2()||onGround3()||onGround4()||onGround5()
        ||onGround6())
        {
            vSpeed = 0; 
        }
        else{
            fall();    
        }
    }

    public void win()
    {
        if (isTouching(Finish.class))
        {
            setLocation(40, 530);
            Greenfoot.playSound("fanfare.wav");
            Greenfoot.stop();
        }
    }
}

public class Mover extends Actor
{
    private int vSpeed = 0;
    private static final int speed = 10;
    
    public void moveRight()
    {
     setLocation (getX() - speed, getY());   
    }
    public void moveLeft()
    {
      setLocation (getX() + speed, getY());
    }
    public boolean onGround()
    {
      Object under = getOneObjectAtOffset(0,getImage()
      .getHeight()/2-8,Start.class); return under !=null;
    }
    public boolean onGround2()
    {
      Object under = getOneObjectAtOffset(0,getImage()
      .getHeight()/2-8, Safezone.class); return under !=null;
    }
    public boolean onGround3()
    {
      Object under = getOneObjectAtOffset(0,getImage()
      .getHeight()/2-8, Safezone.class); return under !=null;
    }
    public boolean onGround4()
    {
      Object under = getOneObjectAtOffset(0,getImage()
      .getHeight()/2-8, Safezone.class); return under !=null;
    }
    public boolean onGround5()
    {
     Object under = getOneObjectAtOffset(0,getImage()
     .getHeight()/2-8, Safezone.class); return under !=null;
    }
    public boolean onGround6()
    {
      Object under = getOneObjectAtOffset(0,getImage()
      .getHeight()/2-8, Safezone.class); return under !=null;
    }
    public boolean onGround7()
    {
     Object under = getOneObjectAtOffset(0,getImage()
      .getHeight()/2-8, Safezone.class); return under !=null;
    }
    public boolean onGround8()
    {
      Object under = getOneObjectAtOffset(0,getImage()
      .getHeight()/2-8, Safezone.class); return under !=null;
    }
    public boolean onGround9()
    {
      Object under = getOneObjectAtOffset(0,getImage()
      .getHeight()/2-8, Safezone.class); return under !=null;
    }
    public boolean onGround10()
    {
      Object under = getOneObjectAtOffset(0,getImage()
      .getHeight()/2-8, Safezone.class); return under !=null;
    }
    public boolean onGround11()
    {
      Object under = getOneObjectAtOffset(0,getImage()
      .getHeight()/2-8, Safezone.class); return under !=null;
    }
    public boolean onGround12()
    {
      Object under = getOneObjectAtOffset(0,getImage()
      .getHeight()/2-8, Safezone.class); return under !=null;
    }   
}