Why do we need to override equals() and hascode() method of object class?
- 1 Answers
- 2587 Views
- Cognizant, I also Faced
- E-Mail Answers
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 |
what is difference betwwen hashmap and hashtable ?
What is an argument in java?
Is void a data type?
What is the purpose of a statement block?
What is meant by overloading?
What is getclass () getname () in java?
What is the requirement of thread in java?
Explain parallel processing in java8?
Explain importance of throws keyword in java?
Explain the selection sort algorithm?
What is the difference between interface & abstract class?
If try block is successfully executed, Then Is Finally block executed?
Core Java 
