Nested Class In Java || Inner Class in Java Tutorial In Hindi

Java Nested Classes or Java Inner classes



When we declear a class into the scope of another class or interface called nested class.


Java inner class or nested class is a class which is declared inside the class or interface.


class Employee
{
String name;
int age;


class Address
{
String city,state,country;
}

class Salary
{

int ta,da,hra;
}

}

Type of Nested class:-

1)-Static-Nested-Class

2)-Non-Nested-Class

3)-Local-Nested-Class

4)-Anonymous-Nested-Class




Types of Nested classes
Java inner class or nested class is a class which is declared inside the class or interface.

We use inner classes to logically group classes and interfaces in one place so that it can be more readable and maintainable.

Additionally, it can access all the members of outer class including private data members and methods.






Syntax of Inner class

class Java_Outer_class
{

//code

class Java_Inner_class
{
//code
}

}














Advantage of java inner classes
There are basically three advantages of inner classes in java. They are as follows:

1) Nested classes represent a special type of relationship that is it can access all the members (data members and methods) of outer class including private.

2) Nested classes are used to develop more readable and maintainable code because it logically group classes and interfaces in one place only.

3) Code Optimization: It requires less code to write.


Types of Nested classes

There are two types of nested classes non-static and static nested classes.The non-static nested classes are also known as inner classes.

Non-static nested class (inner class)
Member inner class
Anonymous inner class
Local inner class
Static nested class


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