Java HashMap detailed tutorial

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This is a detailed description about how to use HashMap in Java. Lot of code examples makes it easy to understand it's behaviour.

Step 1 - How to use Java HashMap

Java HashMap detailed tutorial

HashMap is an implementation of the Map interface. It means that it stores key-value pairs. Both the key and the value also must be an Object. You can not put primitive types into a HashMap, in this cases use their wrapper classes like Integer. Both the key and the value can be null.
Here is a simple example how to create and fill a HashMap. more...