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Java - HashMap vs Map objects可能重复：Java - HashMap与Map对象
I want to know the difference between HashMap and Map in java..??
我想知道Java中HashMap和Map的区别.. ??
5 个解决方案
#1
46
Map is an interface, i.e. an abstract "thing" that defines how something can be used. HashMap is an implementation of that interface.
Map是一个接口，即一个定义如何使用某事物的抽象“事物”。 HashMap是该接口的实现。
#2
#3
3
Map is an interface; HashMap is a particular implementation of that interface.
地图是一个界面; HashMap是该接口的特定实现。
HashMap uses a collection of hashed key values to do its lookup. TreeMap will use a red-black tree as its underlying data store.
HashMap使用散列键值的集合来进行查找。 TreeMap将使用红黑树作为其底层数据存储。
#4
2
Map is an interface in Java. And HashMap is an implementation of that interface (i.e. provides all of the methods specified in the interface).
Map是Java中的一个接口。 HashMap是该接口的实现（即提供接口中指定的所有方法）。
#5
1
HashMap is an implementation of Map. Map is just an interface for any type of map.
HashMap是Map的一个实现。 Map只是任何类型地图的界面。
#1
46
Map is an interface, i.e. an abstract "thing" that defines how something can be used. HashMap is an implementation of that interface.
Map是一个接口，即一个定义如何使用某事物的抽象“事物”。 HashMap是该接口的实现。
#2
17
Map<K,V> is an interface, HashMap<K,V> is a class that implements Map.
Map
you can do
你可以做
Map<Key,Value> map = new HashMap<Key,Value>();
Here you have a link to the documentation of each one: Map, HashMap.
在这里，您可以找到每个文档的链接：Map，HashMap。
#3
3
Map is an interface; HashMap is a particular implementation of that interface.
地图是一个界面; HashMap是该接口的特定实现。
HashMap uses a collection of hashed key values to do its lookup. TreeMap will use a red-black tree as its underlying data store.
HashMap使用散列键值的集合来进行查找。 TreeMap将使用红黑树作为其底层数据存储。
#4
2
Map is an interface in Java. And HashMap is an implementation of that interface (i.e. provides all of the methods specified in the interface).
Map是Java中的一个接口。 HashMap是该接口的实现（即提供接口中指定的所有方法）。
#5
1
HashMap is an implementation of Map. Map is just an interface for any type of map.
HashMap是Map的一个实现。 Map只是任何类型地图的界面。