How to clone HashMap – Shallow and Deep Copy
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Learn to create clone of a HashMap in Java. We will see the java programs to create shallow copy and deep copy of a HashMap. …
How to Synchronize HashMap in Java
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Java HashMap is not synchronized by default. If we add/remove key-value pairs from a HashMap in a concurrent application where multiple threads are adding and …
How to join or merge two hashmaps in Java
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Learn to merge two hashmaps in Java. We will learn to join hashmaps in two cases – ignore duplicate keys (overwrite values) or handle duplicate …
How to compare two hashmaps in Java
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Learn to compare two hashmaps in Java by keys, values and key-value pairs. Also learn to compare while allowing or restricting duplicate values. 1. Compare …
How to design good custom key object for HashMap
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Can we use an object as a key for a hashmap in java? This is a very popular interview question indeed. It is asked immediately …
Performance Comparison of Different Ways to Iterate over HashMap
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We have already learned about how HashMap in java works internally. If my last similar post, I tried to compare different “for loop” flavors available …
How HashMap works in Java
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Learn how hashmap works internally in java with example. Learn the hashmap internal implementation analysis, collision resolution and Java 8 hashmap update.