Error in Java function

Question

I have a problem in this method(it is not complete but the problem is on those lines). The thing is that I have a matrix "x", but after going through the absMatriz function, it changes its values. I would like to know how to keep my x matrix, I have tried saving it in another matrix "www" but it does not work.

 public Matriz[] problema(Matriz x){

        Matriz www=new Matriz(x.m,x.n); //the parameters are the dimensions of the matrix

        www= x;

        double mm= max(absMatriz(x));

        return www;
    }

As I see it, Matriz is an object. If you write www = x, then Java points with www and with x to the same object on the heap. If you really want to make a unique copy of x you have to create a 'new' object. Like this: www = new Matriz(x); — , Feb 01 '17 at 23:49
You didn't save / backup the `x` variable to `www`. You made `www` and `x` *point to* the same object. — OneCricketeer, Feb 01 '17 at 23:49

score 1 · Answer 1 · edited May 23 '17 at 12:17

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It seems that you're looking to make a deep copy of x before absMatriz mutates it, and return the unmutated deep copy.

See How do I copy an object in Java?

edited May 23 '17 at 12:17

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answered Feb 01 '17 at 23:49

Tim Heilman

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Error in Java function

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