Write a Simple interest program to handle negative amount and duration and interest using user defined exception

Write a Simple interest program to handle negative amount and duration and interest using user defined exception

1.Exception Creation Program

package interest;
public class Ninterest extends Exception
{
    public Ninterest(String s)
    {
        super(s);
    }
};

2.Exception verification Program

package verifyinterest;
import interest.Ninterest;
public class Verify
{
    public void checkinterest(int a,int d,int i) throws Ninterest
    {
        if(a>0 && d>0 && i>0)
        { 
            System.out.print("valid Numbers");
        }
        else
        {
            Ninterest n=new Ninterest("Invalid Numbers");
            throw(n);
        }
    }
}

3.Main Program

import interest.Ninterest;
import verifyinterest.Verify;
import java.util.Scanner;
public class Main
{
    public static void main(String args[])
    {
        int a,i,d,si;
        Scanner s=new Scanner(System.in);
        try
        { 
            System.out.print("Enter your Amount : ");
            a=s.nextInt();
            System.out.print("Enter your Duration : ");
            d=s.nextInt();
            System.out.print("Enter your Interest : ");
            i=s.nextInt();
            Verify v=new Verify();
            v.checkinterest(a,d,i);
            si=a*d*i/100;
            System.out.print("Simple Interest is : "+si);
        }
        catch(Ninterest ne)
        {
            System.out.println("Amount and Duration and interest should not be Negative");
        }
    }
}

Enter your Amount : 2000
Enter your Duration : 2
Enter your Interest : 2
Valid Numbers
Simple Interest is : 80

Enter your Amount : -2000
Enter your Duration : -2
Enter your Interest : 2
Amount and Duration and interest should not be Negative


What is difference between the throws and throw ?
Throws is a keyword used to forward the exception to the method call whereas throw is a keyword used to throw exception to the method sign.
Throws always should be followed by method signature whereas throw keyword always should exist within method only.

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