Validation with Exceptions in Java: Explanation & Practice

Problem summary

Create a User validation that throws specific exceptions for different validation failures.

Starter code

class ValidationException extends Exception {
    public ValidationException(String msg) { super(msg); }
}

class User {
    public static void validate(String name, int age, String email) throws ValidationException {
        // Validate: name not empty, age 0-150, email contains @
        // Throw ValidationException with specific message
    }
}

public class Main {
    public static void main(String[] args) {
        try {
            User.validate("", 25, "test@email.com");
        } catch (ValidationException e) {
            System.out.println(e.getMessage());
        }
        
        try {
            User.validate("John", -5, "test@email.com");
        } catch (ValidationException e) {
            System.out.println(e.getMessage());
        }
    }
}

Expected output and test cases

• Correct validation messages

  Name cannot be empty
  Age must be between 0 and 150

Hints

1. Check each condition in order
2. Throw with descriptive message
3. Early return pattern after validation

Related Exception Handling exercises

• Practice Custom AutoCloseable in Java
• Practice Suppressed Exceptions in Java

Practice all Exception Handling exercises · Run this idea in the Java compiler