Name: sgC58550 Date: 03/24/97


In the following code fragment, the expected results are for
"now" and "then" to be the same, and flag to be true. Instead,
"now" is not equal to "then", and "then" prints out as a much
larger number than "now".

import java.io.*;
import java.lang.*;
import java.text.*;
import java.util.*;

public class bug {

    public static void main(String argv[]) {
        String format = "yyyyMMddHHmmss";
        String now, then;
        boolean flag;

        SimpleDateFormat formatter = new SimpleDateFormat(format);

        Date date1 = new Date();
        now = formatter.format(date1);

        System.out.println(now);

        ParsePosition pos = new ParsePosition(0);

        Date date2 = formatter.parse(now, pos);
        then = formatter.format(date2);

        System.out.println(then);

        flag = date2.equals(date1);
        System.out.println(flag);
    }
}

company - AltaVista Internet Software, Inc. , email - ###@###.###
======================================================================

[chamness 6/11/97] I compiled the following code under 1.1.1 and
1.1.2, and I was unable to get df.parse(str,pos) to parse the
string correctly. My output is:
% java bugReport
1997/06/2/Wed/10:54:17 initial
1997/6/2/Wed/10:54:17 to formatter
1997/06/1/Sun/10:54:17 recalc


Synopsis: Invalid date returned from SimpleDateFormat.parse()

Description:
import java.util.*;
import java.text.*;

public class bugReport extends Object {
  private static final String[] daysOfWeek = {
     "Zero", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  };

  Calendar cal;

  public bugReport() {
    super();

    SimpleDateFormat df = new SimpleDateFormat("yyyy/MM/W/EE/HH:mm:ss");
    cal = df.getCalendar();
    Date aDate = new Date();
    cal.setTime(aDate);
    System.out.println("initial " + df.format(aDate));

    String str = getDateString();
    System.out.println("to formatter " + str);
    ParsePosition pos = new ParsePosition(0);

    aDate = null;
    try {
      aDate = df.parse(str,pos);
    } catch(NumberFormatException e) {
      System.out.println(e);
    } catch(StringIndexOutOfBoundsException e) {
      System.out.println(e);
    } catch(IllegalArgumentException e) {
      System.out.println(e);
    }

    if(aDate != null) {
      System.out.println("recalc " + df.format(aDate));
    }
  }

  protected String getDateString() {
    StringBuffer str = new StringBuffer();

    str.append(cal.get(Calendar.YEAR));
    str.append("/");
    //Calendar months are zero based
    str.append(cal.get(Calendar.MONTH) + 1);
    str.append("/");
    str.append(cal.get(Calendar.WEEK_OF_MONTH));
    str.append("/");
    str.append(daysOfWeek[cal.get(Calendar.DAY_OF_WEEK)]);
    str.append("/");
    str.append(cal.get(Calendar.HOUR_OF_DAY));
    str.append(":");
    str.append(cal.get(Calendar.MINUTE));
    str.append(":");
    str.append(cal.get(Calendar.SECOND));

    return str.toString();
  }


  public static void main(String argv[]) {
    bugReport r = new bugReport();
    System.exit(0);
  }
}


executing produces the following:

%date;java bugReport
Thu Apr 10 15:55:24 CDT 1997
initial 1997/04/2/Thu/13:55:24
to formatter 1997/4/2/Thu/13:55:24
recalc 1997/04/1/Tue/13:55:24

=========================================
The following examples returns:

19970616081838
java.lang.NullPointerException
        at java.text.SimpleDateFormat.subParse(SimpleDateFormat.java)
        at java.text.SimpleDateFormat.parse(SimpleDateFormat.java)
        at bug.main(bug.java:11)

import java.text.*;
import java.util.*;
 
public class bug{
  public static void main(String[] args){
    SimpleDateFormat sf = new SimpleDateFormat("yyyyMMddHHmmss");
    sf.setTimeZone(TimeZone.getDefault());
    String s = sf.format(new Date());
    System.out.println(s);
   
 Date d = sf.parse(s, new ParsePosition(0));
  // System.out.println(sf.format(d));
    System.exit(0);
  }
}