Set Interface in Collection Framework

Block Diagram of Set Interface

Indications/ Symbols:

• <<       >>      : Interface
• <          >       : Class
• ---------->       : Implements

Key points:

• Set is a type of collection that stores only unique elements. It doesn't allow duplicate elements.
• It doesn't have Index i.e. elements stored randomly.
• The Set doesn't maintain the order of insertion.
• The elements of the Set can be accessed either by using enhanced for loop or Iterator.
• The implementation classes of a Set interface are

1. HashSet
2. LinkedHashSet
3. TreeSet