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Thread: Java program to sort arrays containing dates

  1. #1
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    Default Java program to sort arrays containing dates

    Hi There:

    I have an array of strings which will contain a date in the following order DD-MM-YYYY and what I would really like to do is SORT that array. What I am currently doing is:

    Arrays.sort(actDate,0,actDate.length);

    By the way, actDate is an array strings that will contain a date (but in string format) like DD-MM-YYYY in decimal (ex: 21-0-2009)

    And i know I cannot sort null values, I am (at this point) assuming the array is full

    What I was thinking of doing is converting (21-05-2009) into the date format and then sorting an array of dates? Would this work? here is my proposal:

     
    private static final String VALID_DATE_REGEX = "(0[1-9]|[12][0-9]|3[01])[-](0[1-9]|1[012])[-](20\\d\\d)";
     
    private static final Pattern DATE_PATTERN = Pattern.compile(VALID_DATE_REGEX);
     
    Matcher mDateMatch = DATE_PATTERN.matcher( actDate );
     
    /// here I would loop through the array of string that I have now and convert them to a date by breaking up the day, month, year like I show below
     
    int nDay = Integer.parseInt( mDateMatch.group(1) );
    int nMonth = Integer.parseInt( mDateMatch.group(2) );
    int nYear = Integer.parseInt( mDateMatch.group(3) );
     
    Date dNewDate = new Date(nYear, nMonth, nDay); // problem is that this is depreciated

    Am I close...how would you do this?

    Thanks!

    Adam Scott


  2. #2

    Default Re: Sorting an array which I hope to fill with dates

    You can use SimpleDateFormat class. For example:

    SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
    Date date = sdf.parse("09-03-2009");
    Date date2 = sdf.parse("09-02-2009");
    Date[] d = { date, date2 };
    Arrays.sort(d);

    This code will sort the array.
    Last edited by leandro; March 9th, 2009 at 07:12 PM.

  3. The Following User Says Thank You to leandro For This Useful Post:

    igniteflow (June 25th, 2009)

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