- ...
public class User {
@NotNull
@Size(min = 2, max = 20)
private String name;
@Range(min = 18, max = 60)
private int age;
}
import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import java.util.Set;
public class Main {
public static void main(String[] args) {
User user = new User();
user.setName("John");
user.setAge(17);
Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
Set<ConstraintViolation<User>> violations = validator.validate(user);
if (!violations.isEmpty()) {
for (ConstraintViolation<User> violation : violations) {
System.out.println(violation.getMessage());
}
}
}
}
