Inner classes are a security mechanism in Java. We know a class cannot be associated with the access modifier private, but if we have the class as a member of other class, then the inner class can be made private. And this is also used to access the private members of a class.
Following is the program to create an inner class and access it. In the given example, we make the inner class private and access the class through a method.
class Outer_Demo { int num; // inner class private class Inner_Demo { public void print() { System.out.println("This is an inner class"); } } //Accessing he inner class from the method within void display_Inner() { Inner_Demo inner = new Inner_Demo(); inner.print(); } } public class My_class { public static void main(String args[]) { //Instantiating the outer class Outer_Demo outer = new Outer_Demo(); //Accessing the display_Inner() method. outer.display_Inner(); } }
This is an inner class.