Java Map Interface

A map contains values based on the key i.e. key and value pair.Each pair is known as an entry.Map contains only unique elements.

Commonly used methods of Map interface:

1. public Object put(object key,Object value): is used to insert an entry in this map.
2. public void putAll(Map map):is used to insert the specified map in this map.
3. public Object remove(object key):is used to delete an entry for the specified key.
4. public Object get(Object key):is used to return the value for the specified key.
5. public boolean containsKey(Object key):is used to search the specified key from this map.
6. public boolean containsValue(Object value):is used to search the specified value from this map.
7. public Set keySet():returns the Set view containing all the keys.
8. public Set entrySet():returns the Set view containing all the keys and values.

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Entry

Entry is the subinterface of Map.So we will access it by Map.Entry name.It provides methods to get key and value.

Methods of Entry interface:

1. public Object getKey(): is used to obtain key.
2. public Object getValue():is used to obtain value.