Difference between HashMap and Map in Java..?

JavaHashmap

Java Problem Overview

> Possible Duplicate:
> Java - HashMap vs Map objects

I want to know the difference between HashMap and Map in java..??

Java Solutions

Solution 1 - Java

Map is an interface, i.e. an abstract "thing" that defines how something can be used. HashMap is an implementation of that interface.

Solution 2 - Java

Map<K,V> is an interface, HashMap<K,V> is a class that implements Map.

you can do

Map<Key,Value> map = new HashMap<Key,Value>();

Here you have a link to the documentation of each one: Map, HashMap.

Solution 3 - Java

Map is an interface; HashMap is a particular implementation of that interface.

HashMap uses a collection of hashed key values to do its lookup. TreeMap will use a red-black tree as its underlying data store.

Solution 4 - Java

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).

Solution 5 - Java

HashMap is an implementation of Map. Map is just an interface for any type of map.

Categories
Recommended Java Solutions
Recommended Hashmap Solutions

Previous Solution:

FIFO class in Java

JavaFifo

Next Solution:

How can I reuse a block multiple times?

SymfonyTwig

Attributions

All content for this solution is sourced from the original question on Stackoverflow.

The content on this page is licensed under the Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

Content TypeOriginal AuthorOriginal Content on Stackoverflow
Questionuser1252812View Question on Stackoverflow
Solution 1 - JavaLars KotthoffView Answer on Stackoverflow
Solution 2 - JavaWalterMView Answer on Stackoverflow
Solution 3 - JavaduffymoView Answer on Stackoverflow
Solution 4 - JavasmessingView Answer on Stackoverflow
Solution 5 - JavaaseychellView Answer on Stackoverflow