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Parameter passing in Java - by reference or by value?
This is another common question on Java newsgroups, made worse by the fact that people who should know better still perpetuate the following myth:

Myth: "Objects are passed by reference, primitives are passed by value"

Some proponents of this then say, "Ah, except for immutable objects which are passed by value [etc]" which introduces loads of rules without really tackling how Java works. Fortunately the truth is much simpler:

Truth #1: Everything in Java is passed by value. Objects, however, are never passed at all.

That needs some explanation - after all, if we can't pass objects, how can we do any work? The answer is that we pass references to objects.

Way too many people say "Java passes primitive by value and objects by reference". This is not the way it should be stated. Java passes everything by value. With primitives, you get a copy of the contents. With references you get a copy of the contents.

But what is the contents of a reference?

The remote control. The means to control / access the object.

Java does manipulate objects by reference, and all object variables are references. However, Java doesn't pass method arguments by reference; it passes them by value.

Vanja Petreski: Mod, lockuj ovo, ovde se svi razumeju, ali ne pricaju istim jezikom :)