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  1. #1
    Sheriff is offline Member
    Join Date
    Feb 2015
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    Default Creating class that throws errors

    I created a class Person:
    Java Code:
    public class Person {
        protected static int MAX_AGE = 150;
        protected static int MIN_AGE = 0;
        private static final String VALID_WORD_REGEXP = "[a-zA-Z]{3,30}";
        private String firstName;
        private String lastName;
        private int age;
        Person(String firstName, String lastName, int age){
        public void setFirstName(String firstName){
                this.firstName = firstName;
                throw new IllegalArgumentException("Invalid first name");
        public void setLastName(String lastName){
                this.lastName = lastName;
                throw new IllegalArgumentException("Invalid last name");
        private boolean isValidWord(String word){
            return word.matches(VALID_WORD_REGEXP);
        public void setAge(int age){
                this.age = age;
                throw new IllegalArgumentException("Age is not in a range of [" + MIN_AGE + "-" + MAX_AGE + "]");
        private boolean isValidAge(int age){
            return age >= MIN_AGE && age <= MAX_AGE;
        String getFirstName(){
            return firstName;
        String getLastName(){
            return lastName;
        int getAge(){
            return age;
    I'm trying to learn right way how to throw exceptions. If I'm doing something wrong let me know and tell me how to fix it.

    Besides that I have couple questions:
    1. I can't quite understand throws statement. I'm thinking throws statement is for passing exceptions one level higher(with are not cought in this caller function). So that would mean I need to put throws in this function only:
      Java Code:
      Person(String firstName, String lastName, int age)
      . Am I right or wrong and is there any other use for it?
    2. If so that would mean when
      Java Code:
      Person person = new Person(.....)
      , must be in try tags. How can I avoid it?

  2. #2
    DarrylBurke's Avatar
    DarrylBurke is offline Forum Police
    Join Date
    Sep 2008
    Madgaon, Goa, India
    Rep Power

    Default Re: Creating class that throws errors

    Have you discovered the Oracle tutorials?
    Lesson: Exceptions (The Java™ Tutorials > Essential Classes)

    If you're forever cleaning cobwebs, it's time to get rid of the spiders.

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