public class TankTest
{
    public static void main(String[] args)
    {
        Tank sherman = new Tank(15, 50, 50);


        System.out.println("Initial Property Values:");
        System.out.println("ammo = " + sherman.getAmmo());
        System.out.println("x = " + sherman.getX());
        System.out.println("y = " + sherman.getY());

        sherman.setAmmo(20);
        sherman.setX(60);
        sherman.setY(70);
        sherman.shoot();
        sherman.moveTo(20,30);
        Tank.displayType();
        
        System.out.println("Final Property Values:");
        System.out.println("ammo = " + sherman.getAmmo());
        System.out.println("x = " + sherman.getX());
        System.out.println("y = " + sherman.getY());
    }
}

// Tank class

 class Tank
{
    // ********************************* constructors

    // default constructor
    public Tank()
    {
        myAmmo = 10;
        myX = 0;
        myY = 0;
    }
    
    // "other" constructor
    public Tank(int ammo, int x, int y)
    {   
        myAmmo = ammo;
        myX = x;
        myY = y;
    }
    
    // ********************************* accessor methods
    public int getAmmo()
    {
        return myAmmo;
    }
 
    public int getX()
    {
        return myX;
    }
    
    public int getY()
    {
        return myY;
    }
    
    // ********************************* modifier methods
    public void setAmmo(int ammo)
    {
        myAmmo = ammo;
    }
    
    public void setX(int x)
    {
        myX = x;
    }
    
    public void setY(int y)
    {
        myY = y;
    }
    
    // ********************************* "interesting" methods
    public void shoot()
    {
        myAmmo = myAmmo - 1;	// could be myAmmo--;
    }
    
    public void moveTo(int newX, int newY)
    {
        myX = newX;
        myY = newY;
    }


    public static void displayType()
    {
        System.out.println("I am a Tank");
    }
    
    // ********************************* properties
    private int myAmmo;
    private int myX;
    private int myY;
}