Assume you just wrote a class that will be used as a key in a hash table. Which of the four options below is most likely to lead to a good performance of the hash table. Use a template or let the IDE generate the overridden hashCode method Override hashCode by adding up the hash-codes of all the fields
Don't override hashCode. Class Object provides already a hash code implementation
Override hashCode by calculating the product of all the numeric fields

Question

19-12-2022
Computers and Technology

Answered

Assume you just wrote a class that will be used as a key in a hash table. Which of the four options below is most likely to lead to a good performance of the hash table. Use a template or let the IDE generate the overridden hashCode method Override hashCode by adding up the hash-codes of all the fields
Don't override hashCode. Class Object provides already a hash code implementation
Override hashCode by calculating the product of all the numeric fields

Answer :

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ShubhamSrivastava ShubhamSrivastava · Answer 1 · 2022-12-25T04:38:42-05:00

I am unable to understand why we need to override hashCode() and equals() while the document is all about effectively and accurately declaring these two functions.

What do you mean by hashCode?

Every Java object has a hash code, which is an integer value. Its primary objective is to make hashing in hash tables, which are utilized by data structures like HashMap, easier. Calling the hashCode() method on an object in Java returns the value of the object's hash code. User-defined classes can also inherit this function because it is by default implemented in the Object class. If the data utilized by the equals() method is not changed, this method returns the same integer value (when called on the same object while running the same Java program instance).

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