Assignment with objects is a bit tricky. : Class Object « Class Definition « Java Tutorial

1. Java Tutorial
2. Class Definition
3. Class Object

class Number {
  int i;
}

public class MainClass {
  public static void main(String[] args) {
    Number n1 = new Number();
    Number n2 = new Number();
    n1.i = 9;
    n2.i = 47;
    System.out.println("1: n1.i: " + n1.i + ", n2.i: " + n2.i);
    n1 = n2;
    System.out.println("2: n1.i: " + n1.i + ", n2.i: " + n2.i);
    n1.i = 27;
    System.out.println("3: n1.i: " + n1.i + ", n2.i: " + n2.i);
  }
}

1: n1.i: 9, n2.i: 47
2: n1.i: 47, n2.i: 47
3: n1.i: 27, n2.i: 27