Exception_Handling Program

Create an exception class named NegativeNumberException extended from the class Exception. This class should contain a parameterless constructor to call the Exception class constructor with the message “You should enter a positive number”. Create a class named exercise3 that contains:

a) A method named M1 that accepts a double variable as argument and returns its square root. The method should throw the NegativeNumberException exception defined above.

b) The main method to prompt the user to enter a number and then to call the method M1 (insert a try-catch block to handle the NegativeNumberException exception).



package javaapplication5;

import java.util.*;

class NegativeNumberException extends Exception
{
public NegativeNumberException()
{
super("You should enter a

Positive Number.");
}
}
public class JavaApplication5
{
public static void main (String[] args)
{
        Scanner s;
                    s = new Scanner(System.in);
  try
{
  System.out.println

("Enter a number :");
  double n = s.nextInt();
  System.out.println(M1

(n));
  }
        catch

(NegativeNumberException e )
{
    System.out.println(e);
  }

  }
  public static double M1(double x)throws

NegativeNumberException
  {
  if(x < 0) throw new

NegativeNumberException();
    return Math.sqrt(x);
}
}


/* OUTPUT:
run:
Enter a number :
4
2.0
BUILD SUCCESSFUL (total time: 4 seconds)

run:
Enter a number :
-4
javaapplication5.NegativeNumberException: You

should enter a Positive Number.
BUILD SUCCESSFUL (total time: 4 seconds)
*/

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