public class Number {
   private int number;

   public Number( int number ) {
      this.number = number;
   }

   public int getNumber() {
      return this.number;
   }

   public void setNumber( int number ) {
      this.number = number;
   }

   public static void main( String[] args ) {
      Number one = new Number( 1 );
      Number two = new Number( 2 );
      System.out.println( "Beginning: " );
      System.out.println( "One = " + one.getNumber() );
      System.out.println( "Two = " + two.getNumber() );

      // Assign two to one
      two = one;
      System.out.println( "\nAfter assigning two to one: " );
      System.out.println( "One = " + one.getNumber() );
      System.out.println( "Two = " + two.getNumber() );

      // Change the value of two
      two.setNumber( 3 );
      System.out.println( "\nAfter modifying two: " );
      System.out.println( "One = " + one.getNumber() );
      System.out.println( "Two = " + two.getNumber() );
   }
}