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What is the Map interface?- A Map maps keys to values.
- It cannot contain duplicate keys.
- It contains only unique elements.
The three general-purpose of Map implementations are
1. HashMap
2. TreeMap
3. LinkedHashMap.
1. HashMap: It is the basic map implementation.
2. TreeMap: It maintains the keys in a sorted order.
3. LinkedHashMap: It maintains the objects which are added to the map.
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