How do you get the “object reference” of an object in java when toString() and hashCode() have been overridden?

by

What exactly are you planning on doing with it (what you want to do makes a difference with what you will need to call).

hashCode, as defined in the JavaDocs, says:

As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)

So if you are using hashCode() to find out if it is a unique object in memory that isn’t a good way to do it.

System.identityHashCode does the following:

Returns the same hash code for the given object as would be returned by the default method hashCode(), whether or not the given object’s class overrides hashCode(). The hash code for the null reference is zero.

Which, for what you are doing, sounds like what you want… but what you want to do might not be safe depending on how the library is implemented.

More Related Contents:

  1. What is an object’s hash code if hashCode() is not overridden?
  2. How do hashCode() and identityHashCode() work at the back end?
  3. How to ensure hashCode() is consistent with equals()?
  4. How default .equals and .hashCode will work for my classes?
  5. Difference between Object[] and Array of specific Objects in java
  6. the difference between reference and object in java [duplicate]
  7. StreamCorruptedException: invalid type code: AC
  8. The difference between Classes, Objects, and Instances
  9. How does a ArrayList’s contains() method evaluate objects?
  10. How does the String class override the + operator?
  11. Converting Java objects to JSON with Jackson
  12. Understanding the workings of equals and hashCode in a HashMap
  13. How can I get the memory location of a object in java?
  14. How is hashCode() calculated in Java
  15. What is the difference between identity and equality in OOP?
  16. Why doesn’t String’s hashCode() cache 0?
  17. Why should I override hashCode() when I override equals() method?
  18. Why is the toString() method being called when I print an object?
  19. How to cast an Object to an int
  20. Should I write equals() and hashCode() methods in JPA entities?
  21. java StackOverflowError when local and instance objects creation
  22. Can Java’s hashCode produce same value for different strings?
  23. Mutable objects and hashCode
  24. Comparing Integer objects [duplicate]
  25. Inheritance in java and Superclasses(Object, Class)
  26. When do instance variables get initialized and values assigned?
  27. Java: For-Each loop and references [duplicate]
  28. hashCode uniqueness
  29. Classes that don’t inherit Object class
  30. How many Java objects are generated by this – new String(“abcd”)

Leave a Comment