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Thread: Questions!

  1. #1
    Junior Member
    Join Date
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    Default Questions!

    package javaapplication2;
    class DayCounter{
    public static void main(String[] arguments){
    int yearIn = 2013;
    int monthIn = 12;

    if (arguments.length < 0)
    monthIn = Integer.parseInt(arguments[0]);
    if( arguments.length < 1)
    yearIn = Integer.parseInt(arguments[1]);
    System.out.println( monthIn + "/" + yearIn + " has "
    + countDays(monthIn, yearIn) + "days.");

    }


    This is just a part of the whole java file/program that I don't understand.
    So my question is, what length are they referring to at:
    if (arguments.length < 0)
    if (arguments.length < 1) ?

    Why did the person choose 0 and 1?


    Also, what is "Integer.parseInt" and does (arguments[0] ) mean the monthIn will be stored in the "String[] arguments"?
    If so, then what's the point of that?

    monthIn = Integer.parseInt(arguments[0]);
    yearIn = Integer.parseInt(arguments[1]);




    I know that I have many questions, but please answer this question too:

    When I type in statements and expressions in the main method, do they get stored inside the main method? (In the "String[] arguments" in this case)

    Please answer my questions
    I'm self-studying Java with a book that doesn't explain things very well.
    Thanks!


  2. #2
    Junior Member
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    Default Re: Questions!

    Is there an input to this code in "main". This doesn't make much sense. This Java - parseInt() Method talks about parseInt.

    I recommend "Head First Java" for an excellent book that you can buy used. I would like to see the rest of the program if it's not too big. thx.

  3. #3
    Junior Member
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    Default Re: Questions!

    package javaapplication2;
    class DayCounter{
    public static void main(String[] arguments){
    int yearIn = 2013;
    int monthIn = 12;

    System.out.println( arguments.length );


    if (arguments.length < 20000)
    monthIn = Integer.parseInt(arguments[0]);
    if( arguments.length < 2)
    yearIn = Integer.parseInt(arguments[1]);
    System.out.println( monthIn + "/" + yearIn + " has "
    + countDays(monthIn, yearIn) + "days.");

    }

    static int countDays(int month, int year) {
    int count = -1;
    switch (month) {
    case 1:
    case 3:
    case 5:
    case 7:
    case 8:
    case 10:
    case 12:
    count = 31;
    break;
    case 4:
    case 6:
    case 9:
    case 11:
    count = 30;
    break;
    case 2:
    if ( year % 4 == 0 )
    count = 29;
    else count = 28;
    if (( year % 100 == 0) & year % 400 !=0)
    count = 28;
    }

    return count;


    }
    }

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