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This article mainly explains "what are the common methods of Map". Friends who are interested may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn what are the common methods of Map.

The bottom layer of set is the map of the default value

Common methods of Map

/ / introduce the method of Map interface

Map map = new HashMap ()

/ / 1. Increase

/ / V put (K key,V value) add a key-value pair

/ / about the return value, if the current key has not been added before, return null. If the current key already exists, the previous value is returned here

/ / void putAll (Map

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