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Tag Archives: java

Internal Working of HashMap in Java

In this article, we will see how hashmap’s get and put method works internally. What operations are performed. How the hashing is done. How the value is fetched by key. How the key-value pair is stored. As in previous article, HashMap contains an array of Node and Node can represent ...

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5 Essential difference between Callable and Runnable interface in Java?

In this article, I’ll discuss how to answer this question by highlighting some key differences between Runnable and Callable in Java. I didn’t know all these points at that time but my research after that helped to learn more about the Callable interface. Even though both Callable and Runnable interface are used to encapsulate task supposed ...

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How to get current date time in java

java

Java provides the Date class available in java.util package, this class encapsulates the current date and time.You can also use Calendar class to get current date and time. Getting Current Date & Time This is very easy to get current date and time in Java. You can use a simple ...

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Wrapper class in Java

java

Wrapper classes are used to convert primitive into object and object into primitive. Each of Java’s eight primitive data types has a class dedicated to it. These are known as wrapper classes, because they “wrap” the primitive data type into an object of that class. The primitive data types are ...

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Super keyword in java

java

Super keyword in java is a reference variable that is used to refer parent class object.Whenever you create the instance of subclass, an instance of parent class is created implicitly i.e. referred by super reference variable. Usage of java super Keyword super is used to refer immediate parent class instance ...

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Collections in Java

java

Collections in java is a framework that provides an architecture to store and manipulate the group of objects.This framework has several useful classes which have tons of useful functions which makes a programmer task super easy. All the operations that you perform on a data such as searching, sorting, insertion, ...

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Exception Handling In Java

java

An exception (or exceptional event) is a problem that arises during the execution of a program. When an Exception occurs the normal flow of the program is disrupted and the program/Application terminates abnormally, which is not recommended, therefore these exceptions are to be handled. Exception can occur at runtime (known ...

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Java Basic

java

Java is a high-level programming language originally developed by Sun Microsystems and released in 1995. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. This tutorial gives a complete understanding of Java.

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