Constructors in Java can be seen as a special method in a class. But there is a big difference between Constructor and Method. These differences can be defined in terms of purpose, syntax, and invocation. A constructor is used in…
Java Inner classes are classes within class. An inner class instance has a special relationship with outer class. This special relationship gives inner class access to a member of the outer class as if they are the part of the…
Java Inheritance defines an is-a relationship between a superclass and its subclasses. This means that an Object of a subclass can be used wherever an object of the superclass can be used. Class Inheritance in Java is used to build…
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…
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…
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…
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…
Let’s learn more about local variables in Java. Variables that are declared inside Methods in a Java program are called local variables.
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…
Reference variables are used to refer to an object. They are declared with a specific type that cannot be changed. Types of reference variables Static Variable Instance Variable Method Parameter Local Variable