Implementation of Weighable

The table below indicates where methods are implemented and the time complexity of these methods. Some methods are implemented in more than one place. When this happens, each entry overrides the entries to its left. When an entry says "based on iterator" or "traverse iterator" or "uses size," then the time complexity depends on the iterator or size method.

	*Weighable Implementation*	*Weight*
	constructor ()	O(1)
	constructor (double weight)	O(1)

int	compareTo (Object obj)	O(1)
boolean	equals (Object obj)	O(1)
double	getWeight()	O(1)
void	setWeight (double weight)	O(1)
String	toString ()	O(1)