Why do we need to override equals() and hascode() method of object class?
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
Which is illegal identifier in java?
Does google use java?
Is linked list a linear or non-linear data structure?
why are there separate wait and sleep methods? : Java thread
What is the difference between an argument and a parameter?
Give an example of use of pointers in java class.
Can static methods be inherited?
how to prepare for IT Officers Interview in Banks
You're given a Boolean 2D matrix, can you find the number of islands?
What are the legal operands of the instanceof operator?
What means public static?
What are the elements of java?
How many threads can java run?
What is yield () in java?
Explain what access modifiers can be used for variables?