Synchronization in Java: What, How and Why? What are Operators in Java and its Types? – File Handling Concepts. Java collections refer to a collection of individual objects that are represented as a single unit. Java Collections – Interface, List, Queue, Sets in Java With Examples Last updated on Sep 15,2020 155.9K Views Aayushi Johari A technophile who likes writing about different technologies and spreading knowledge. Following example uses different types of collection classes and adds an element in those collections. See your article appearing on the GeeksforGeeks main page and help other Geeks. How To Practice String Concatenation In Java? It defines several utility methods like sorting and searching which is used to operate on collection. Below are some of the methods of Java TreeSet class: Let us understand these TreeSet with a programmatic example: Now you must be wondering what is the difference between all these sets? What are the components of Java Architecture? Classes: Classes in Java are the implementation of the collection interface. Now, let us see the Java collections framework hierarchy. What is a Constant in Java and how to declare it? play_arrow link brightness_4. What is the difference between Method Overloading And Overriding? Do read my next blog on Java Interview Questions where I have listed top 75 interview questions and answers which will help you set apart in the interview process. I hope you guys are clear with Java collections framework, it’s hierarchy, interface, list, queue and sets that I have discussed above. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. What is the Use of Abstract Method in Java? What is ExecutorService in Java and how to create it? What is a Do while loop in Java and how to use it? Queue in Java follows a FIFO approach i.e. A collection in Java is an object that stores a group of objects as a single unit. The List, Set, and Queue are the main sub-interfaces of the collection interface. It is used to append the given element to the end. A technophile who likes writing about different technologies and spreading knowledge. How to convert an Array to String in Java? The map interface is also part of the java collection framework, but it doesn’t inherit the collection of the interface. Java Collections Interview Questions Iterator and ListIterator12. In TreeSet class, access and retrieval time are faster. What Are Methods In Java? import java.util. Doubly Linked List: In a doubly Linked list, it has two references, one to the next node and another to previous node. What is Coupling in Java and its different types? Writing code in comment? What is Trim method in Java and How to Implement it? Return the index of the last occurrence of the specified element in the list, or -1 if the list does not contain any element. What is Modulus in Java and how does it work? For example, It has a method sort() to sort the collection elements according to default sorting order, and it has a method min(), and max() to find the minimum and maximum value respectively in the collection elements. This is very basic information,please improve the content as no one will ask this type of information in interview. Solution. Iterator interface : Iterator is an interface that iterates the elements. All You Need To Know About Wrapper Class In Java : Autoboxing And Unboxing. Vector implements a dynamic array. What is the role for a ClassLoader in Java? Collections: Collections is a utility class present in java.util.package. It is mainly used to model the mathematical set abstraction. Collection: Collection is a interface present in java.util.package. 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