How do I use an equivalent to C++ reference parameters in Java?

Question

Suppose I have this in C++:

void test(int &i, int &j)
{
    ++i;
    ++j;
}

The values are altered inside the function and then use

Answer 1

You could construct boxed objects, ie,

Integer iObj = new Integer(i);
Integer jObj = new Integer(j);

and write your routine as

public void test(Integer i, Integer j){
  i = i.add(1);
  j = j.add(1);
}

For any number of reasons, the designers of Java felt call-by-value was better; they purposefully didn't include a method for call by reference. (Strictly, they pass copies of references to the objects, with the special case for the primitive types that they are purely call by value. But the effect is the same.)