How to Convert a Map to a List in Java - Example Tutorial

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. The primary difference between Map (HashMap, ConcurrentHashMap, or TreeMap) and List is that Map holds two objects key and value while List just holds one object which itself is a value. Key in hashmap is just an add-on to find values, so you can just pick the values from Map and create a List out of it. The map in Java allows duplicate values which is fine with List which also allows duplicates but Map doesn't allow duplicate keys.
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