Class « hashcode « Java Class Q&A

1. Do two classes of the same class have the same hashcode and are they considered equal?    stackoverflow.com

I want to create a hashmap of classes like (Object.class). I am wondering whether Object.class is considered equal to another Object.class? Can there be another instance of Object.class which leads it to ...

2. Java - wrapper classes and hashCode()    stackoverflow.com

is there any difference b/w value returned by Integer's hashCode() and intValue()? Can hashcode be negative?

3. hashcode collisions for different classes    stackoverflow.com

I have two simple wrapper classes around an Integer field, where I had to override equals() and hashCode(). In the end, they both use the same algorithm for hashCode(), so ...

4. What are ways to keep hashCode/equals consistent with the business definition of the class?    stackoverflow.com

Object javadocs and Josh Bloch tell us a great deal about how hashCode/equals should be implemented, and good IDEs will handle fields of various types correctly. Some discussion about all ...

5. Equals and Hashcode for a class    coderanch.com

When we write a equals and hashcode for a class. Do we have to use every member in the hashcode that is being used in equals? For student If I am comparing by there Ssn and Age and Height In equals methods. Do I have to use the same three in the hashcode method also? Thanks for your help in advance ...

6. equals() & hashCode() method in Object class    coderanch.com

7. hashCode() static reference from abstact class    coderanch.com

8. why hashcode same for String not for Class Object?    coderanch.com

hi, here I am having two String Obect . "s1" is not pointing to the address that "s2" is refering to and vice versa. I know that hashcode gives the memory address of the object. then why it gives same hashcode for object "s1" and "s2" and not for class(ArrayMap) object ? please let me know the real difference. following is ...

9. Enum class - equals() and hashCode() ?    coderanch.com

10. Immutable class - equals() and hashCode() methods ?    coderanch.com

11. Can I Override equals() and hashCode() in my class    coderanch.com

12. MemoryCell class: create hashCode() for simple class    forums.oracle.com

Are you asking if it's okay to just return that int member variable? Yes, it is. Hashcode cannot use any numbers that don't also get used in equals, other than constants--that is, it can't use any fields that don't also contribute to equals. The only thing you might want to do is multiply the thing by an arbitrary prime constant. The ...

13. why java.util.date class object contains system date and not hashcode?    forums.oracle.com

14. Why methods equals() and hashCode() is defined in Object Class?    forums.oracle.com

15. hashcode method in Object class?    forums.oracle.com

Say we have Employee class.I have seen while implementing hashtable, in most of cases we usually override the hashcode method(in this case employee overrides hashcode and equals method ). Is there any disadvantage in using the default hashcode method by object class? I understand when we require some specific functionality like we want the last employee object in case first name ...