Whereas, TreeMap also implements the Map interface but sorts the elements based on their natural ordering or by a comparator provided at map creation. 9 Hashmap uses hashing for storing its entries, which allows it to achieve constant time complexity for basic operations like get and put under...
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HashMap is a generic Java class that implements the Java Collection Framework Map interface. It uses a hash table to store elements in the map, which uses the hashing mechanism internally. Each element of the HashMap is a pair of keys and values. The keys of maps must be unique though ...
You can choose from Hashtable, HashMap, TreeMap based upon your subsequent need. In order to choose between the first two see the difference between HashSet and HashMap in Java. That's all about the difference between Set, List, and Map in Java. All three are the most fundamental ...