Is hashCode same as address?

Given the importance of the hashCode() method, it's advisable to override it whenever necessary, especially in classes that will be used as keys in hash-based collections like HashMap or HashSet. A well-designed hashCode() method can significantly improve the performance of these collections by reducing the frequency of hash collisions and improving the distribution of objects within the hash table.

The hashCode() method holds a pivotal role in the realm of Java programming, serving as a fundamental tool for managing objects. Its purpose transcends mere convenience, as it directly influences the efficiency and performance of Java collections, particularly when it comes to hashing-based data structures.

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In the absence of an explicitly defined hashCode() method within a class, Java adopts a default strategy. This strategy involves assigning an identity hash code to each object instance, a value that is unique to that specific object's identity within the Java Virtual Machine (JVM).

It's crucial to understand that this identity hash code should not be confused with the object's memory address. Despite the common misconception, the two are not synonymous. The identity hash code is a value derived from the object's internal state or its identity within the JVM, while the memory address denotes the physical location of the object in memory.