Can someone please give me an example of a Java method which is referentially transparent?

Question

I know that A method is referentially transparent if its return value (with identical actual parameters) is independent of the program context.

e.g. this code is not transparent.

public static int Erna () {
  return y;
}

but can someone please give an example of java code which is transparent so I can understand this better?

Related (with examples in some answers): [What is referential transparency?](http://stackoverflow.com/q/210835/1065197) — Luiggi Mendoza, May 20 '15 at 22:19

score 3 · Accepted Answer · answered May 20 '15 at 22:18

public static int addOne(int i) {
    return i + 1;
}

is a referentially transparent method - addOne(2) can be replaced by 3 without affecting the program's behaviour.

Note that referential transparency is a high-level concept, not a language feature (at least in Java).

1 Answers1