Classes and their implementation

Java » Classes and their implementation

A class is a user-defined data type which encapsulates attributes and methods of an object. In Java, all programs are built upon classes and have a main() method from where your program begins, but a Java program doesn’t necessarily have the main() method, for example, Applet.

Basically, a class is a framework or blueprint where the attribute and behaviour of an object defined. It is a basic construct in JAVA.

Attribute or Variables that resides within a class are known as instance variables or data members as every object has a copy of these variables. Behaviour or methods within a class are known as member functions. An object is an instance of a class, also considered as a copy of the class.`

A class can be created by using a Class keyword.

Data members are the attributes of an object or entity.

Member functions are responsible for changing the state of an object or entity by acting on attributes of that object.

JAVA program to demonstrate the working of Class




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