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Difference between inner class and nested class in Java?

Answer»

A nested class in Java is declared inside a class or interface. There are two types of nested CLASSES i.e. static and non-static. The non-static nested classes are known as inner class in Java whereas the static nested classes are merely known as nested class.

A program that demonstrates an inner class in Java is GIVEN as follows:

class Outer {   class Inner   {      public void display()      {           System.out.println("Inside the inner class METHOD");      }   } } public class Main {   public static void main(String[] args)   {       Outer.Inner OBJ = new Outer().new Inner();       obj.display();   } }

The output of the above program is as follows:

Inside the inner class method

A program that demonstrates the nested class in Java is given as follows:

class Outer {     static int num = 67;     static class Inner   {      public void display()      {           System.out.println("The number is: " + num);      }   } } public class Main {   public static void main(String[] args)   {       Outer.Inner obj = new Outer.Inner();       obj.display();   } }

The output of the above program is as follows:

The number is: 67


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