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Thread: throwing Exception

  1. #1
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    Default throwing Exception

    Hi guys.
    I have two simple question for you, this is about programmer defined exception. (this source code come from thomas wu book, OOP introduction),

    firstly,
    is it okay for not write throws IllegalArgumentException in methode setPassword, as I know this methode throw exception?
    problem.jpg

    secondly,
    I have programmer defined Exception here, and in the AgeInputException Constactore there's no throws IllegalArgumentException.
    is it okay?
    ask.jpg
    Attached Images Attached Images


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: throwing Exception

    Please post the code here in the forum that you have questions about.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: throwing Exception

    haha, sorry Norm, I'm new here..

    Here there are

    I wonder In this defined Exception constructor, there's no throws IllegalArgumentException on the header of class,
    you can see that that constructor throwing an exception.
    /*
    Chapter 8 Sample Class: Customized Exception Class
    File: AgeInputException.java
    */
    class AgeInputException extends Exception {
    private static final String DEFAULT_MESSAGE = "Input out of bounds";
    private int lowerBound;
    private int upperBound;
    private int value;
    public AgeInputException(int low, int high, int input) {
    this(DEFAULT_MESSAGE, low, high, input);
    }
    public AgeInputException(String msg,  //<=== there's no throws IllegalArgument Exception here
    int low, int high, int input) {
    super(msg);
    if (low > high) {
    throw new IllegalArgumentException();
    }
    lowerBound = low;
    upperBound = high;
    value = input;
    }


    in this code too, in the setPassword methode there's no throws IllegalArgumentException too
    import java.io.*;
    class Resident implements Serializable {
    private String name;
    private String room;
    private String password;
    public Resident( ) {
    this("unassigned", "000", "XY12#$ab");
    }
    public Resident(String name, String room, String pwd)
    throws IllegalArgumentException {
    setName(name);
    setRoom(room);
    setPassword(pwd);
    }
    public String getName( ) {
    return name;
    }
    public String getPassword( ) {
    return password;
    }
    public String getRoom( ) {
    return room;
    }
    public void setName(String name) {
    this.name = name;
    }
    public void setPassword(String pwd) {
    int length = pwd.length();
    if (length < 8) {
    throw new IllegalArgumentException();
    } else {
    this.password = pwd;
    }
    }
    public void setRoom(String room) {
    this.room = room;
    }
    }

    so what do you think?

    thanks for your advice btw

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: throwing Exception

    Read the API doc for the exception and the class it extends.
    If you don't understand my answer, don't ignore it, ask a question.

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