If all usages of a parameter are preceded by an assignment to that parameter, the parameter can be replaced with a local variable. Such a parameter is unnecessary, as values that are passed to it are overwritten. Usually, the problem appears as a result of refactoring.

Example:

  void test(int p) {
    p = 1;
    System.out.print(p);
  }

After the quick-fix is applied:

  void test() {
    int p = 1;
    System.out.print(p);
  }