How to use nested class in Java

Question

Can someone help me understand the use-case of Nested Class in Java? Thank you in advance.

Answer 1

This program will help you understand the working of function and nested class in Java.

import java.util.*;

class SecondClass
{
    int demofunction(int n)
    {
           System.out.println("This will print the content inside the function");
           int m = 10;
           return m;
    }
}

class MainClass
{  
    public static void main(String args[])
    {
            int n = 20;
            SecondClass obj= new SecondClass();
            System.out.println("This will print the content of main class" + obj.demofunction(n));
    }
}