What is class in Java?

A class is a blue-print from which individual objects are created. A sample of a class is given below: 

public class Dog
{ 
 String breed; 
 int age; 
 String color; 
 void barking()
 {
 
 }
 void hungry()
 {
 
 }
 void sleeping()
 {
 
 }
}


 

A class can contain any of the following variable types.
Local variables:- variables defined inside methods, constructors or blocks are called local variables. The variable will be declared and initialized within the method and the variable will be destroyed when the method has completed.

Instance variables:- . Instance variables are variables within a class but outside any method. These variables are instantiated when the class is loaded. Instance variables can be accessed from inside any
method, constructor or blocks of that particular class.

Class variables:- . Class variables are variables declared with in a class, outside any method, with the static keyword.

A class can have any number of methods to access the value of various kind of methods. In the above example, barking(), hungry() and sleeping() are methods.

Below mentioned are some of the important topics that need to be discussed when looking into classes of the Java Language.