Equals and Hashcode Contract in Java [Important Java Interview Question] | Code Decode

Published: 19 April 2020
on channel: Code Decode

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In this video of code decode we have covered Equals and hashcode contract || Equals and hashcode in Java

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In this video equals and hashcode contract By default, the Java super class java.lang.Object provides two important methods for comparing objects: equals() and hashcode(). These methods become very useful when implementing interactions between several classes in large projects. In this article, we will talk about the relationship between these methods, their default implementations, and the circumstances that force developers to provide a custom implementation for each of them.

equals(Object obj): a method provided by java.lang.Object that indicates whether some other object passed as an argument is "equal to" the current instance. The default implementation provided by the JDK is based on memory location — two objects are equal if and only if they are stored in the same memory address.

hashcode(): a method provided by java.lang.Object that returns an integer representation of the object memory address. By default, this method returns a random integer that is unique for each instance. This integer might change between several executions of the application and won't stay the same

How equals and hashcode contract works in java ?

The default implementation is not enough to satisfy business needs, especially if we're talking about a huge application that considers two objects as equal when some business fact happens. In some business scenarios, developers provide their own implementation in order to force their own equality mechanism regardless the memory addresses.

As per the Java documentation in perspective of equal and hashcode contract, developers should override both methods in order to achieve a fully working equality mechanism — it's not enough to just implement the equals() method.

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