Map Common method of HashMap on an interface

A Map is used to store key-value pairs. Key-value pairs stored in a Map class are identified by keys. Therefore, key-value pairs cannot be repeated.

The implementation classes of Map interface include HashMap, TreeMap, HashTable, etc

Object PUT (Object key, Object Value) Stores key and value pairs

Object GET (Object key) Obtains value objects from key objects

Object Remove (Object key) Deletes key-value pairs of objects

boolean containsKey(Object key)

boolean containsValue(Object value)

int size()

boolean isEmpty()

void putAll(Map t)

void clear()