A class that wraps a primitive data type into an object is called wrapper class in Java. In simple words, wrapper class provides a mechanism to convert primitive data type value into an object and vice-versa. For example, wrapping int…
Here, we have listed the real-time and tricky top 32 automation testing interview questions with the best possible answers. These selenium automation testing interview questions are always asked from the freshers and 3 years of experience candidates by the interviewer. We…
Calendar class in Java is an abstract super class that is designed to support different kinds of calendar systems. It is used to know system data and time information. Java Calendar class provides some specific functionality that is common to…
StringTokenizer in Java is a utility class that breaks a string into pieces or multiple strings called “tokens”. For example, strings separated by space and tab characters are tokens. These tokens are separated with the help of a delimiter. A…
Comparator in Java is an interface whose task is to compare objects of a user-defined class when the class does not implement the Comparable interface. In other words, Java Comparator is used when: Objects to be ordered do not have…
Comparable interface in Java defines compareTo() method for comparing objects of the same type. In other words, comparable interface defines a standard way in which two objects of the same class will be compared. It is mainly used to provide…
A Stack in Java is a collection (or group) of elements stored in the last in first out (LIFO) order. In other words, a stack is a data structure that stores data in last-in, first-out fashion. This means an element…
ArrayDeque in Java is a concrete class that creates a dynamic array (resizable array) to store its elements from both sides of the queue. It provides a resizable-array implementation of deque interface. Therefore, it is also known as array double-ended…
A double ended queue or deque in Java is a linear data structure that supports insertion and removal of elements from both ends (head and tail). It is usually pronounced “deck”, not “de queue”. Java deque is an extended version…
