writing a method with object parameters

im writing a class that performa arithmetic on weights, im trying to write a method that adds two weight objects together (in my case the weights are in pounds and ounces so the method itself will add the pounds and ounces individually but i want to parse 2 weight objects to the method

what wil the mthod delcartion be to write such a method?

public ? addWeights(Weights w1, Weights w2){

//implementation

}

//called from a test program

Weights w1 = new Weights(13, 12)

Weights w2 new Weights(10, 3)

addWeights(w1, w2)

pelase help