Java - pass a variable by reference

Question

I wish to send an 'int' to a function that changes its value. I want to send it by reference so the new value of 'int' is kept after returning to the callee. What is the most effective way to do it?

I know that I can use a wrapper class Integer that sends an object of an 'int'. However, I can't figure out how to change the value of this class, so the change will prevail after returning to the callee.

Thanks for your help.

This is because Integer is immutable, as it should be. You need to make your own wrapper class. — Ingo, Apr 19 '14 at 10:52
Integer class is immutable, so may be you need to create your own class with int as instance variable — sidgate, Apr 19 '14 at 10:53
make your method return the modified int value and then set it again. — rai.skumar, Apr 19 '14 at 11:00
OK. So, as far as I understand, there is no built-in method inside Integer class that can handle such a case. Am I right? — user3189985, Apr 19 '14 at 11:04
I hope this helps you out. http://stackoverflow.com/questions/5614562/how-to-pass-by-reference-in-java — Syed Mauze Rehan, Apr 19 '14 at 11:08

score 3 · Answer 1 · edited May 23 '17 at 11:49

3

Nothing can be passed by reference in java, you need a wrapper, a conventional bean would do:

public class MyWrapper {
int x;
public void setX(int x){
    this.x = x;
  }
}

edited May 23 '17 at 11:49

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answered Apr 19 '14 at 10:56

NimChimpsky

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Java - pass a variable by reference

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