Reference Passing Test : Method Parameters « Class Definition « Java Tutorial

1. Java Tutorial
2. Class Definition
3. Method Parameters

class Point {
  public int x;

  public int y;
}

public class MainClass {
  public static void increment(int x) {
    x++;
  }

  public static void reset(Point point) {
    point.x = 0;
    point.y = 0;
  }

  public static void main(String[] args) {
    int a = 9;
    increment(a);
    System.out.println(a); // prints 9
    Point p = new Point();
    p.x = 400;
    p.y = 600;
    reset(p);
    System.out.println(p.x); // prints 0
  }
}

9
0