Java Object Comparision

      public class Coordinates {

         private double longitude;
         private double latitude;

         public Coordinates(double longitude, double latitude) {
             this.longitude = longitude;
             this.latitude = latitude;
         }
      }

      Coordinates c1 = new Coordinates(1.34, 3.32);
      Coordinates c2 = new Coordinates(1.34, 3.32);

      String a = new String ("a");
      String b = new String ("a");
      String a1 = "a";

Evaluar expresiones:

          c1 == c1
          c1 == c2
          a == b
          a == "a" 
          "a" == "a"
          a1 == "a"