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

public void addWeights(Weights w1, Weights w2){
//implementation
}

As it is not supposed return anything (?). If there is a probalility for invalid Weight objects that you want to trap you can either return a boolean indicating failure or success;

public boolean addWeights(Weights w1, Weights w2){
//implementation
}

or declar the addWeights method to throw an Exception when the Weight object(s) are up the creek.

public void addWeights(Weights w1, Weights w2) throws Exception {
//implementation
.
.
if (somethingVeryWrong) {
throw new Exception("These Weights are insane");
}


}

The place where the question mark is located is for the return type of the method. This is where you say what will happen when the method exits. If the method ends by producing a value or object you say what type of value or object. If nothing is returned you say void.

I imagine that the addWeights method will produce a new Weights object containing the result. This means you need to put Weights where the question mark is.

Code:

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public Weights addWeights(Weights w1, Weights w2)

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