There is no such keyword in Java.
In general: whether an argument is passed by value or by reference is determined by whether the argument is a primitive (by value) or an Object (by reference).
In reality, it's a little more complicated. It seems to be that the actual reference you send as an argument will not change, but the data it refers to will.
// This method will not cause a change in the original value.
void changeArg(int[] ints) {