working of hashmap abstract class vs interface why using the interface is better than abstract class and in which situation

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Explains the working of hashmap and the difference between abstract class and interface.

Hashmap is a data structure that stores key-value pairs and uses hashing to retrieve values quickly.
Abstract classes are classes that cannot be instantiated and can have both abstract and non-abstract methods.
Interfaces are contracts that define a set of methods that a class must implement.
Using interfaces is better than abstract classes when multiple inheritance is needed or when a class needs to implement multiple contracts.
Abstract classes are better when there is a need for default implementations or when a class needs to provide a common implementation for its subclasses.
Interfaces promote loose coupling and allow for easier testing and maintenance.
Abstract classes provide a level of abstraction and can be used to enforce a certain design pattern.
In Java, the Map interface is implemented by the HashMap class.

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