Design for validation

Validation.java

public class Validation {
        // Driver code.
        public static void main(String... args) throws Exception {
                Person p = new Person("john", 25);
                Person p2 = new Person("", 25);
        }
}

// Validator interface would typically be placed in the utility folder.
interface Validator {
        void run() throws Exception;
}

// ValidatorUtil would typically be placed in the utility folder.
class ValidationUtil {
        public static void validate(String baseErrMsg, Validator... validators) throws Exception {
                for (Validator v : validators) {
                        try {
                                v.run();
                        } catch (Exception e) {
                                throw new Exception (baseErrMsg, e);
                        }
                }
        }
}

// Person class.
class Person {
        private String name;
        private int age;

        // Wrapped the validators in an inner class.
        // However, you could also just have them as private static methods in the Person class that return Validator.
        private static class PersonValidator {
                static Validator nameValidator(Person p) {
                        return () -> {
                                if (p.name == "") throw new Exception("invalid name");
                        };
                }

                static Validator ageValidator(Person p) {
                        return () -> {
                                if (p.age < 0) throw new Exception("invalid age");
                        };
                }
        }

        // A person object is successfully instantiated only if the validation succeeds.
        // Otherwise, an exception is thrown.
        public Person(String name, int age) throws Exception {
                this.name = name;
                this.age = age;

                ValidationUtil.validate("invalid person",
                        PersonValidator.nameValidator(this),
                        PersonValidator.ageValidator(this));
        }
}