Java Collections Framework: A Complete Overview


Java collection framework gives an architecture to manipulate and store the group of objects. Java collection framework can accomplish every one of the operations that you perform on data like deletion, manipulation, insertion, sorting, and searching.

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What is a framework in java?

A framework in java is a set of interfaces and classes which give an instant architecture. To execute another class or a feature, there is no compelling reason to characterize a framework. In any case, an ideal object-oriented design consistently incorporates a system with a collection of classes to such an extent that every one of the classes plays out a similar sort of task.

What is the Java collection framework?

Java collection framework resembles containers that group different things in a solitary unit. For instance, a list of names, a jar of chocolates, and so on. Java collection framework is utilized in each programming language, and when Java showed up, it likewise accompanied not many Collection classes like Array, Hashtable, Stack, Vector. The Map interface (java.util.Map) and Collection interface (java.util.Collection) are the two principal “root” interface classes of the Java collection framework.

Advantages of the Java collection framework

Since the absence of a Java collection framework offered transcends a set of limitations, coming up next are the advantages of the Java collection framework.

  1. Predictable API:The API has a fundamental set of interfaces like Map, List, Set, or Collection, every one of the classes (Vector, LinkedList, ArrayList, and so on) that execute these interfaces have some basic arrangement of techniques.
  2. Speeds up and quality:Increases execution by giving superior executions of valuable data algorithms and structures.
  3. Decreases programming exertion:A programmer doesn’t need to stress over the plan of the Collection, yet rather, he can focus on its best use in his program.

Hierarchy of the Java collection framework

Let us understand the java collections hierarchy or collection hierarchy:

The utility package (java.util) contains every one of the interfaces and classes that are needed by the Java collection framework. The framework contains an iterable interface that allows the iterator to repeat through every one of the collections. This interface is stretched out by the principal interface, which goes about as a root for the system. Every one of the collections expands this interface along these lines broadening the properties of the iterator and the techniques for this interface.

Various methods in the java collection framework

This interface contains different strategies which can be straightforwardly utilized by every one of the collections which execute this interface. They are:

  1. add(Object):It utilized to add an object.
  2. toArray():It is utilized to return an array.
  3. addAll(Collection c):It adds every one of the elements.
  4. stream():It is utilized to return a sequential Stream.
  5. clear():It eliminates the entirety of the elements.
  6. spliterator():It is utilized to make a Spliterator.
  7. contains(Object o):Collection contains the predetermined element it returns true.
  8. size():It is utilised to return the number.
  9. containsAll(Collection c):Collection contains all of the elements it returns true.
  10. retainAll(Collection c):It is utilized to retains just the elements in the specified collection.
  11. remove(Predicate filter):It is utilized to eliminates every one of the elements of a given predicate.
  12. equals(Object o):It contrasts the predetermined object.
  13. removeAll(Collection c):It is utilised to eliminate every one of the objects mentioned.
  14. hashCode():It is utilised to return the hash code.
  15. remove(Object o):It is utilised to eliminate object.
  16. isEmpty():Collection contains no elements it return true.
  17. parallelStream():It returns a parallel Stream.
  18. max():It is utilised to return the most extreme value.
  19. iterator():It returns an iterator over the elements.

Interfaces in java collection framework

The java collection framework contains numerous interfaces where each interface is utilized to store data of specific types of collections in java. Coming up next are the interfaces present in the framework:

  1. Iterable Interface:This is the root interface for the whole framework.
  2. Collection Interface:This interface broadens the iterable interface and is executed by every one of the classes in the framework.
  3. List Interface:This is a child interface of the interface. This list interface is carried out by different classes like Stack, Vector, ArrayList, and so on.
  4. Queue Interface:As the name proposes, a queue interface keeps up the FIFO request like a queue line.
  5. Deque Interface:This is a slight variation in the queue data structure.
  6. Set Interface:A set is an unordered of objects wherein copy values can’t be put away.
  7. Sorted Set Interface:This interface is fundamentally the same as the set interface. The lone variation is that this interface has additional techniques that keep up the ordering of the components.
  8. Map Interface:It is a data structure that supports the key-esteem pair mapping for the data.


The java collection framework has gotten help to developers because of the complex hierarchical design of interfaces and classes. It includes different techniques inside its subclasses that make the Java program adaptable utilizing various data structures.


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