8.4.2 Method Signature

The signature of a method consists of the name of the method and the number and types of formal parameters to the method. A class may not declare two methods with the same signature, or a compile-time error occurs. The example:

class Point implements Move {
	int x, y;
	abstract void move(int dx, int dy);
	void move(int dx, int dy) { x += dx; y += dy; }
}

causes a compile-time error because it declares two move methods with the same signature. This is an error even though one of the declarations is abstract.