Java tutorials for Beginners – Java Collection Interface

(Java programming Example for Beginners)

Java Collection Interface

In this tutorial, we will learn about the Java Collection interface and its subinterfaces.

The Collection interface is the root interface of the Java collections framework.

There is no direct implementation of this interface. However, it is implemented through its subinterfaces like ListSet, and Queue.

For example, the ArrayList class implements the List interface which is a subinterface of the Collection Interface.

Java Collection Interface and its subinterfaces.

Subinterfaces of Collection

As mentioned above, the Collection interface includes subinterfaces that are implemented by various classes in Java.

1. List Interface

2. Set Interface

The Set interface allows us to store elements in different sets similar to the set in mathematics. It cannot have duplicate elements.

3. Queue Interface

The Queue interface is used when we want to store and access elements in First In, First Out(FIFO) manner.

Methods of Collection

The Collection interface includes various methods that can be used to perform different operations on objects. These methods are available in all its subinterfaces.

  • add() – inserts the specified element to the collection
  • size() – returns the size of the collection
  • remove() – removes the specified element from the collection
  • iterator() – returns an iterator to access elements of the collection
  • addAll() – adds all the elements of a specified collection to the collection
  • removeAll() – removes all the elements of the specified collection from the collection
  • clear() – removes all the elements of the collection


Java tutorials for Beginners – Java Collection Interface

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