Java Interview Questions and Answers: Includes Java version till Java 12, Hibernate, Spring, Spring-Boot, Web Services by Bandal Pratik

Author:Bandal, Pratik [Bandal, Pratik]
Language: eng
Format: epub, azw3, mobi
Published: 2020-08-20T16:00:00+00:00

Vector = 10

HashSet = 16

HashMap = 16

Hashtable = 11

HashSet =16

164.

What is difference between collections and collection?

The collection is root interface in the collection hierarchy. A collection is basically group of objects, known as its elements.

Collections is a class which includes static methods that operate on or return collections.

165.

What is iterator?

The java.util.Iterator interface is a member of the Java Collections Framework.

Iterator interface contains methods to iterate over any Collection.

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