public class EqualityDemo {

  public static void main(String[] args) {
   
    // create two Rectangle objects with the same parameters
    Rectangle r1 = new Rectangle(100, 200, 5, -5);
    Rectangle r2 = new Rectangle(100, 200, 5, -5);
    
    // objctes are different. We fail here.
    if( r1 == r2)
      System.out.println("r1 == r2");
    
    // Equals function works!
    if(r1.equals(r2))
      System.out.println("r1 equals r2");
    if(r2.equals(r1))
      System.out.println("r1 equals r2");
    
    // hashCode return values are also equal.
    System.out.format("r1 hashCode: 0x%x\n", r1.hashCode());
    System.out.format("r2 hashCode: 0x%x\n", r2.hashCode());
    
  }
}