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POA very simple java code (to get date of a week day), but Very Strange result I get, WHY?
 

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  1. POA very simple java code (to get date of a week day), but Very Strange result I get, WHY?
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    <p>I have the following java code to get the date of a specific week day:</p> <pre><code>SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy"); Calendar cal = Calendar.getInstance(); cal.setTime(new Date()); cal.set(Calendar.YEAR, 2010); cal.set(Calendar.WEEK_OF_YEAR, 37); //week 37 of year 2010 cal.set(Calendar.DAY_OF_WEEK, Calendar.THURSDAY); System.out.println("date="+sdf.format(cal.getTime())); </code></pre> <p>When I put this code in a <code>main(String[] args)</code>method, like the following:</p> <pre><code>import java.util.*; import java.lang.*; import java.text.SimpleDateFormat; public class test{ public static void main(String[] args){ /** get dates from a known week ID **/ SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy"); Calendar cal = Calendar.getInstance(); cal.setTime(new Date()); cal.set(Calendar.YEAR, 2010); cal.set(Calendar.WEEK_OF_YEAR, 37); cal.set(Calendar.DAY_OF_WEEK, Calendar.THURSDAY); System.out.println("date="+sdf.format(cal.getTime())); } } </code></pre> <p>and run it, I get the correct result which is <code>date=09/09/2010</code>. There is no problem.</p> <p><strong>HOWEVER...</strong></p> <p>When I put this code in a function of a Class, like the following:</p> <pre><code>Public Class MyService{ MyService(){} ... ... public String getDateOfWeekDay(int weekId, int year, int weekDay){ //weekId = 37; year=2010; weekDay = Calendar.THURSDAY SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy"); Calendar cal = Calendar.getInstance(); cal.setTime(new Date()); cal.set(Calendar.YEAR, year); cal.set(Calendar.WEEK_OF_YEAR, weekId); cal.set(Calendar.DAY_OF_WEEK, weekDay); //I am developing android app. so I use Log to printout logPrinter.println("date="+sdf.format(cal.getTime())); return sdf.format(cal.getTime()); } } </code></pre> <p>in another class MainClass, MainClass will invoke this service function like following:</p> <pre><code>Public Class MainClass{ MyService myService = new MyService(); myService.getDateOfWeekDay(37,2010,Calendar.THURSDAY); } </code></pre> <p>But the result returned is always the date of the <strong>current week's thursday (date=14/10/2010)</strong>, not the Thursday of the week which I specified (week 37, year 2010, Thursday). WHY???? I use exactly the same java code to get the date of the specific week day, only used it in different ways, why the result is different???? I can not understand this...Anybody can explain to me?? </p>
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    1. USMellon
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      1. POA very simple java code (to get date of a week day), but Very Strange result I get, WHY?
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      1. POA very simple java code (to get date of a week day), but Very Strange result I get, WHY?
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      1. POA very simple java code (to get date of a week day), but Very Strange result I get, WHY?
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    1. COIs it possible that the code in the question isn't the same as the code you're actually using? My suspicion would be that the order of the arguments to the function is different than the arguments you're supplying -- for example, your function expects year/week/day and you're supplying week/year/day. Obviously that's not the case in the question, so I'm left wondering if you used cut/paste or retyped and got it right here, but not in your actual code.
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      1. POA very simple java code (to get date of a week day), but Very Strange result I get, WHY?
      1. UStvanfosson
    2. COWell, I have even tried to use constant variable inside my service function getDateOfWeekDay(int weekId, int year, int weekDay) with year=2010, weekId=37, weekDay=5 (thursday), but the result is still the date of current week's thursday.
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      1. POA very simple java code (to get date of a week day), but Very Strange result I get, WHY?
      1. USMellon
    3. COputting your code in another class shouldn't really change anything, but I tested it anyway. I don't think anyone else can reproduce your error. Can you repaste ALL of your code above, from both classes?
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      1. POA very simple java code (to get date of a week day), but Very Strange result I get, WHY?
      1. USrobert_x44
 

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