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Java Method Override

A class inheriting the method from its superclass has the option to override it. The benefit of overriding is the ability to define behavior specific to a particular class. In the case of a concrete subclass, it is forced to implement all methods defined in abstract class if no other superclass implemented it in the hierarchy. Overriding sometimes referred… Continue reading

Java Exceptions Tutorial

Exception in Java is used to handle errors or any other exceptional event that occurs in the normal flow of a program. There are several way Exception can occur in Java. Data provided is not in expected format(eg. int instead of String). DB cannot be connected. Network connection Lost. An object is null. …..

Collection in Java

Collection Framework has been added in JDK 1.2 and has been expanded in 1.4 -1.6 Interface & Classes of Collection Framework Collection API provides a group of the interface to choose from, but it also gives you some concrete classes to directly play with. Core Interfaces Collection List Set SortedSet (Extends Set Interface) NavigableSet (Extends SortedSet) Map… Continue reading

Interface in java

Defining a Contract means to create an Interface. This Contract states what a Class can do without forcing how it should do it. In this Java Interface Tutorial, we will talk about Interfaces. How to create one and rules applied to Interfaces.

Instance Variable in Java

An Instance variable in Java is used by Objects to store their states. Variables that are defined without the STATIC keyword and are Outside any method declaration are Object-specific and are known as instance variables. They are called so because their values are instance-specific and are not shared among instances. If a class has an instance variable,… Continue reading