Tags: Collection , Interview

List interface

Characteristics

• Element added from 0th index, 1st, 2nd, ... nth (Sequentially).
• List allows to insert/update/read element at specific index.
• List allows duplicate values.
• It maintains insertion position (1st point).
• It allows null value.

ArrayList is one of the popular implementation of List used by programmers.

Examples

• How to Initialize List in declaration?
• How List.add() and List.addAll() works?
• How to sort List of Bean in Java?
• How to remove all elements from List except specific?
• How to convert List of data to Set of data and vice versa in Java?
• How to reverse List in Java Collection Framework?
• Collection Framework examples in Java 8

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Set interface

Characteristics

• Unlike List, Set will not allow index based insert/update/read.
• Set doesn't allow duplicate. e1 and e2 such that e1.equals(e2)
• It doesn't maintain insertion position (unordered collection). However you can maintain order using LinkedHashSet.
• It allows null value.

HashSet is one of the popular implementation of Set used by programmers.

Examples

• How to Initialize Set in declaration?
• How to convert List of data to Set of data and vice versa in Java?
• Collection Framework examples in Java 8

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Map interface

Characteristics

• Unlike List, Map will not allow index based insert/update/read.
• Map doesn't allow duplicate KEY.
• It doesn't maintain insertion position (unordered collection). However you can maintain order using LinkedHashMap.
• It allows one null KEY and n number of null VALUE.

HashMap us one of the popular implementation of Map used by programmers.



Collection Framework examples in Java 8

Tags: Collection , Interview