Write a program to handle negative age exception

Write a program to handle negative age exception

1.Exception Creation Program

package studentage;
public class Nage extends Exception
{
    public Nage(String s)
    {
        super(s);
    }
};

2.Exception verification Program

package verifyage;
import studentage.Nage;
public class Verify
{
    public void checkage(int a) throws Nage
    {
        if(a>0)
        { 
            System.out.print("valid age");
        }
        else
        {
            Nage n=new Nage("Invalid age");
            throw(n);
        }
    }
}

3.Main Program

import studentage.Nage;
import verifyage.Verify;
import java.util.Scanner;
public class Main
{
    public static void main(String args[])
    {
        System.out.print("Enter your age : ");
        Scanner s=new Scanner(System.in);
        try
        {
            int age=s.nextInt();
            Verify v=new Verify();
            v.checkage(age);
            System.out.print("your age is : "+age);
        }
        catch(Nage ne)
        {
            System.out.println("Age should not be Nagetive");
        }
    }
}

Enter your age: 20
Valid age
your age is : 20

Enter your age : -20
Age 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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