Class diagram of Set API

This post helps you understand how the Set interfaces and classes are designed in the Java Collections framework.

You know, in Set API:

• • Set<E>is the base interface for all kinds of set. This interface extends all methods from the Collection<E> interface and does not define any new methods.
  • Sub interfaces: SortedSet<E> and NavigableSet<E>.
  • Abstract subclasses: AbstractSet<E> and EnumSet<E extends enum<E>>.
  • Concrete implementation classes: HashSet<E>,LinkedHashSet<E>,TreeSet<E>, ConcurrentSkipListSet<E> and CopyOnWriteArraySet<E> (these two last classes are under java.util.concurrent package).
  • The JobStateReasons class extends HashSet<E> but it is not a member of Java Collections Framework.

The following class diagram outlines the Set API in Java Collections Framework:

Related Java Set Tutorials:

• Java Set Tutorial
• Java SortedSet and TreeSet Tutorial
• Java NavigableSet and TreeSet Tutorial

Other Java Collections Tutorials:

• What is Java Collections Framework?
• Java Queue Tutorial
• Java List Tutorial
• Java Map Tutorial
• Understand equals and hashCode
• Understand object ordering

About the Author:

Nam Ha Minh is certified Java programmer (SCJP and SCWCD). He began programming with Java back in the days of Java 1.4 and has been passionate about it ever since. You can connect with him on Facebook and watch his Java videos on YouTube.