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List in Java provides the facility to maintain the ordered collection. It contains the index-based methods to insert, update, delete and search the elements. It can have the duplicate elements also. We can also store the null elements in the list. The List interface is found in the java.util package and inherits the Collection interface.
Java HashSet. Java HashSet class is used to create a collection that uses a hash table for storage. It inherits the AbstractSet class and implements Set interface. The important points about Java HashSet class are: HashSet stores the elements by using a mechanism called hashing. HashSet contains unique elements only.
300 Core Java Interview Questions | Set 1. There is the list of 300 core Java interview questions. If there is any core Java interview question that has been asked to you, kindly post it in the ask question section. We assure that you will get here the 90% frequently asked interview questions and answers.
Conclusion. Collections and Streams are both valuable tools in a Java developer's toolkit, each with its distinct advantages and use cases. Collections are great for storing and modifying data, while Streams shine when it comes to functional-style data transformation and parallel processing.
Java Collections list() Method. The list() method of Java Collections class is used to get an array list containing the elements returned by the specified enumeration in the order in which they are returned by the enumeration. Syntax. Following is the declaration of list() method:
Java HashMap class implements the Map interface which allows us to store key and value pair, where keys should be unique. If you try to insert the duplicate key, it will replace the element of the corresponding key. It is easy to perform operations using the key index like updation, deletion, etc. HashMap class is found in the java.util package.
1) sort() The Collections.sort()methodis available in the java.util.Collectionsclass. The Collections.sort()method helps us to sort the elements available in the specified list of Collections. By default, the sort() method sorts the elements in ascending order. The sort() method of the Collectionsinterface works similarly to the Arraysinterface.
