package dk.itu.oop.lecture1;

public class Ball {
	protected int x,y;
	protected String color;
	public Ball(String color){
		this.color = color;
		x=0; y=0;
	}
	public void move(int dx, int dy){
		x+=dx; y+=dy;
	}
	public String toString(){
		return color + " ball at (" + x +
				"," + y + ")";
	}
	
	public boolean equals(Object obj){
		if (obj == null) // 1
			return false;
		if (obj == this) // 2
			return true;
		if ( !(obj instanceof Ball) ) // 3
			return false;
		//if ( !super.equals(obj) ) // 4
		//	return false;
		Ball other = (Ball)obj;
		return // 5
			this.x == other.x &&
			this.y == other.y;
	}

}