Why do we need to override equals() and hascode() method of object class?
- 1 Answers
- 3019 Views
- Cognizant, I also Faced
- E-Mail Answers
Answer Posted / javamasque
As per equality contract of Java if two objects are equal then they should return equal integer, means if obj1.equals(obj2) then obj1.hashCode() == obj2.hashCode();
As we override equals method we compares equality on value of each property inside 1st object with 2nd object, as it finds all properties are equal then returns true else false.
As we override hascode method we generate a unique integer by multiplying with prime number. If we multiply with prime number then there is most possibility to get unique integer. The prime number 31 is mostly used as the hascode method is override.
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
What are the different access modifiers available in java?
How do you override a method in java?
Differentiate between a class and an object.
What are the drawbacks of singleton class?
What is finally block?
What is Enum in Java?
What is immutable class in java?
Can a java program have 2 main methods?
Explain the polymorphism principle?
Can you have two constructors in java?
Why string is called as immutable?
What are 5 boolean operators?
What is the requirement of thread in java?
What are static blocks and static initalizers in java ?
Can we extend private class in java?
