package javaapplication17;

class InvalidInputException extends Exception { public InvalidInputException(String message) { super(message); } }

class NegativeNumberException extends Exception { public NegativeNumberException(String message) { super(message); } }

class InvalidOperatorException extends Exception { public InvalidOperatorException(String message) { super(message); } }

class UnsupportedOperationException extends Exception { public UnsupportedOperationException(String message) { super(message); } }

class Calculator { public static double performOperation(double num1, double num2, char operator) throws InvalidInputException, NegativeNumberException, InvalidOperatorException, UnsupportedOperationException {

    if (num1 < 0 || num2 < 0) {
        throw new NegativeNumberException("Negative numbers are not allowed.");
    }

    switch (operator) {
        case '+':
            return num1 + num2;
        case '-':
            return num1 - num2;
        case '*':
            return num1 * num2;
        case '/':
            if (num2 == 0) {
                throw new UnsupportedOperationException("Cannot divide by zero.");
            }
            return num1 / num2;
        default:
            throw new InvalidOperatorException("Invalid operator: " + operator);
    }
}

}

public class JavaApplication17 { public static void main(String[] args) { try { double result1 = Calculator.performOperation(10, 2, '+'); System.out.println("Result 1: " + result1);

        double result2 = Calculator.performOperation(8, 0, '/');
        System.out.println("Result 2: " + result2);

    } catch (InvalidInputException | NegativeNumberException | InvalidOperatorException | UnsupportedOperationException e) {
        System.out.println("Exception: " + e.getMessage());
    }
}

}

output run: Result 1: 12.0 Exception: Cannot divide by zero. BUILD SUCCESSFUL (total time: 0 seconds)

Exercises-to-implement-built-in-and-user-defined-exception-handling