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|Java - Interview Questions and Answers|
|Frequently asked in all types of companies especially Indian Services companies. Frequently asked in CTS (Based on 2 feedback)|
|Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc. The value received from hashcode() is used as bucket number for storing elements. This bucket number is the address of the element inside the set/map. when you do contains() then it will take the hashcode of the element, then look for the bucket where hashcode points to and if more than 1 element is found in the same bucket (multiple objects can have the same hashcode) then it uses the equals() method to evaluate if object are equal, and then decide if contain() is true or false, or decide if element could be added in the set or not.|
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|Like Discuss Correct / Improve  java   collections   hashcode   advanced  hashtable Asked in 32 Companies intermediate   frequent|
Try 1 Question(s) Test
|Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object?|
|Write a class and override the equals and hashcode method ?|
|How many threads can access a concurrent hashmap when the hashcode is overridden and always returns a zero.|
|What is the use of defining equals , compareTo and hashcode methods in a class ? Where are they used ?|