Java – protects int, visible only to the specified method

Is there any way to make me invisible to other methods in the same class?

private int i;

private void updateI(int i) {
  this.i = i;
}

Solution

No – all members of the class are visible to each other

If you find that some members of your class should not access a specific member, it may indicate that you should separate your courses – consider whether you can better partition information Of course, this is not always a solution - of course, if you find that there are two or three interrelated fields and only some methods should be touched, it usually means that you should put them in your own type