How to use references in Java?

Required reading on understanding Java's Pass By Value semantics:

http://www.javaworld.com/javaworld/javaqa/2000-05/03-qa-0526-pass.html http://javadude.com/articles/passbyvalue.htm http://javachannel.net/wiki/pmwiki.php/FAQ/PassingVariables (links to several other pages)

Completely remove the notion from your head that Java can have anything passed by reference. Let's look at an example, shall we?

public class App
{
    public static void main( String[] args )
    {
        Foo f1 = new Foo();
        doSomethingToFoo(f1);
        System.out.println(f1.bar); //Hey guess what, f1.bar is still 0 because JAVA IS PASS BY VALUE!!!
    }

    static void doSomethingToFoo(Foo f) {
        f = new Foo();
        f.bar = 99;
    }

    static class Foo {
        int bar = 0;
    }
}
Answer:1

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