When a developer is working on a module, they always come across some form of data structure, like set, queue, list, etc. Data structures are used for storing Java objects in a certain fashion so that they are easy to retrieve when needed.
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The right data structure makes functionality more efficient and effective — otherwise, it would be a nightmare as the implementation expands. You can start with a Map of one of the data structures where objects are stored in the key-value format. And with the help of key, we can easily retrieve the value in time complexity of O(1).