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Category: Collection Framework

This category will have tutorial about Collection Framework.

EnumMap in Java

EnumMap in Java

EnumMap is specialized Map implementation designed and optimized for using Java Enum as key. EnumMap in Java is added on JDK  5 release. There are some similarities as well as differences between EnumMap and HashMap which you can find hereFollowings are the features of EnumMap.

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TreeMap in Java

TreeMap in Java

The TreeMap class implements the Map interface which store key-value pairs in tree data structure. It provides an efficient means of storing key/values pairs in sorted order.

Followings are the features of TreeMap.

  1. It contains only unique elements.
  2. It can’t have null key but can have multiple null values.
  3. It is not synchronized i.e not safe for multi-threaded application.
  4. It is same as HashMap instead maintains ascending order.

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