how to call function in Java?

// Java Code:     public class  A extends Applet{             public void foo(int[] a)         {             a[0]=3;         }     }         //Javascript Code:     var arg = new Array(1);     arg[0]=2;     Applet.foo(arg); But `arg[0]` remains `2`

I've looking around and I have found out this three ways JNI, Jython(not sure it is possible with android ) and XML RPC) so I wanna know the best way in term of performance and difficulty of implementation, thanks in advance

I am making a GUI in Java that needs to allow the end user to create (many) functions of a strictly mathematical variety. For now we can restrict ourselves to functions of one variable. So let's say that there's a pad of buttons with built-in functions...

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