Java Inner Class (Nested class)

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A class is declared within the class which is called inner class (or) nested class. The class which holds the inner class is called the outer class.

Syntax:

class OuterClass {
   class InnerClass {
   }
}

Example

public class Outerclass{  
    private int Age=30;  
    class Innerclass{  
        void showdata(){
            System.out.println("Age is "+Age);
        }  
    }  
    public static void main(String args[]){  
        Outerclass oc=new Outerclass();  
        Outerclass.Innerclass ic=oc.new Innerclass();  
        ic.showdata();  
    }  
}
Run ›

Types of Nested classes

There are divide into two types:

  • Non-static nested class (Inner class)
    1. Member inner class
    2. Local inner class
    3. Anonymous inner class
  • Static nested classes
Inner class

Advantages of Inner classes

  • Inner class can access all the data member of outside class.
  • It is easily to develop read and maintain code.
  • It is easy to optimize the code.
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