How to override hashcode in Java example - Tutorial
Equals and hashcode methods are two primaries but yet one of the most important methods for java developers to be aware of. Java intends to provide equals and hashcode for every class to test equality and to provide a hash or digest based on the content of the class. The importance of hashcode increases when we use the object in different collection classes which works on hashing principle e.g. hashtable and hashmap. A well-written hashcode method can improve performance drastically by distributing objects uniformly and avoiding a collision. In this article, we will see how to correctly override the hashcode() method in java with a simple example . We will also examine the important aspects of hashcode contracts in java. This is in continuation of my earlier post on overriding equals method in Java, if you haven’t read already I would suggest going through it. General Contracts for hashCode() in Java 1) If two objects are equal by equals() method then there hashcode returned by hash...