20.User defined Exception

import java.util.*;
class notequal extends Exception
{
    void display()
    {
        System.out.println("String are not equal");
    }
}
class stringequal
{
    public static void main(String args[])
    {
        Scanner t = new Scanner(System.in);
        String s1,s2;
        System.out.println("enter 1st string");
        s1 = t.next();
        System.out.println("enter 2nd string");
        s2 = t.next();
        try
        {
            if(s1.equals(s2))
            {
                System.out.println("Strings are equal");
            }
            else
            {
                throw new notequal();
            }
        }
        catch(notequal n)
        {
            n.display();
        }
    }
}