How to Convert Map to List in Java Example

Map and List are two common data-structures available in Java and in this article we will see how can we convert Map values or Map keys into List in Java. Primary difference between Map (HashMap, ConcurrentHashMap or TreeMap) and List is that Map holds two object key and value while List just holds one object which itself is a value. Key in hashmap is just an addon to find values, so you can just pick the values from Map and create a List out of it. Map in Java allows duplicate value which is fine with List which also allows duplicates but Map doesn't allow duplicate key.

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Posted by bandrux

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