Question

Create a moderately complex java program that utilises 2 or more classes. Within these classes:
- have one that defines an exception
- have that exception throw(n) in one method and handled in another
-has the program continue even if the user inputs incorrect data
-be creative/unique in some way

Answer 1

import java.util.InputMismatchException;
import java.util.Scanner;


class MyNegativeNumberException extends RuntimeException{
        public MyNegativeNumberException(String m) {
                super(m);
        }
}
public class TestEx {
        public static void main(String[] args) {
                Scanner sc = new Scanner(System.in);
                System.out.println("Enter numbers (0 to exit): ");
                int n=sc.nextInt();
                int sum=0;
                while(n!=0) {
                        try {
                                checkIfNegative(n);
                                sum+=n;
                        }
                        catch (InputMismatchException e) {
                                sc=new Scanner(System.in);
                        }
                        catch (MyNegativeNumberException e) {
                                System.out.println(e);
                        }
                        n=sc.nextInt();
                }
                System.out.println("Sum = "+sum);
        }

        private static void checkIfNegative(int n) throws MyNegativeNumberException{
                if(n<0)
                        throw new MyNegativeNumberException("Invalid number");
        }
}

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