Core Java - [Java Inner Class]

♠ Posted by Unknown in Core Java at 10:54

Java Inner Class Example

It is possible to define a class within another class, such classes are known as nested classes. The scope of a nested class is bounded by the scope of its enclosing class. Thus, if class B is defined within class A, then B is known to A, but not outside of A. a nested class has access to the members, including private members, of the class in which it is nested. However, the enclosing class does not have access to the  members of the nested class.

The most important type of nested class is the inner class. An inner class is a non-static nested class. It has access to all of the variables and methods of its outer class and may refer to them directly in the same way that other non-static members of the outer class. Do. Thus, an inner class is fully within the scope of its enclosing class.

import java.io.*;

import java.lang.*;

class  OuterClass

{

            private int out;

            public void Display_Outer()

            {

                        InnerClass iObj = new InnerClass(10);

                        System.out.print("First in Outer Class : ");

                        iObj.Display_Inner();

            }

            class InnerClass

            {

                        public InnerClass(int x)

                        { out = x; }

                        public void Display_Inner()

                        {

                                    System.out.println("Value of Outer Class Variable : " + out);

                        }

            };

};

public class InnerExample

{

            public static void main(String[] args)

            {

                        OuterClass obj = new OuterClass();

                        obj.Display_Outer();

            }

};