Calendar.java (set): Never recompute fields here.

	* java/util/Calendar.java (set): Never recompute fields here. They
	will already be set if someone set time explicitly, and it can cause
	problems to do so. Don't invalidate AM_PM setting if HOUR is set.
	* java/util/GregorianCalendar.java (computeTime): Don't ignore an
	HOUR setting if AM_PM is set. Don't try to ensure the HOUR value is
	sane.
	* java/text/SimpleDateFormat.java (defaultCentury): New field.
	(readObject): Call set2DigitYearStart if appropriate so that
	defaultCentury is calculated.
	(SimpleDateFormat): Don't bother clearing calendar here. Call
	computeCenturyStart().
	(set2DigitYearStart): Calculate and set defaultCentury.
	(format): Don't clone the calendar. Use "calendar" not "theCalendar"
	everywhere.
	(parse): Likewise. If the pattern is "y" or "yy" and it found exactly
	2 numeric digits, use the 80-20 heuristic to parse the value into a
	default century based on defaultCenturyStart.
	(computeCenturyStart): Rewritten. Call set2DigitYearStart().

From-SVN: r44395

libjava/ChangeLog

+2001-07-26  Bryce McKinlay  <bryce@waitaki.otago.ac.nz>
+
+	* java/util/Calendar.java (set): Never recompute fields here. They 
+	will already be set if someone set time explicitly, and it can cause
+	problems to do so. Don't invalidate AM_PM setting if HOUR is set.
+	* java/util/GregorianCalendar.java (computeTime): Don't ignore an
+	HOUR setting if AM_PM is set. Don't try to ensure the HOUR value is 
+	sane.
+	* java/text/SimpleDateFormat.java (defaultCentury): New field.
+	(readObject): Call set2DigitYearStart if appropriate so that 
+	defaultCentury is calculated.
+	(SimpleDateFormat): Don't bother clearing calendar here. Call
+	computeCenturyStart().
+	(set2DigitYearStart): Calculate and set defaultCentury.
+	(format): Don't clone the calendar. Use "calendar" not "theCalendar"
+	everywhere.
+	(parse): Likewise. If the pattern is "y" or "yy" and it found exactly
+	2 numeric digits, use the 80-20 heuristic to parse the value into a
+	default century based on defaultCenturyStart.
+	(computeCenturyStart): Rewritten. Call set2DigitYearStart().
+
 2001-07-25  Tom Tromey  <tromey@redhat.com>
 
 	* Makefile.in: Rebuilt.

libjava/java/util/Calendar.java

@@ -549,8 +549,6 @@ public abstract class Calendar implements Serializable, Cloneable
    */
   public final void set(int field, int value)
   {
-    if (!areFieldsSet)
-      computeFields();
     isTimeSet = false;
     fields[field] = value;
     isSet[field] = true;
@@ -573,7 +571,6 @@ public abstract class Calendar implements Serializable, Cloneable
 	isSet[HOUR] = false;
 	break;
       case HOUR:
-	isSet[AM_PM] = false;
 	isSet[HOUR_OF_DAY] = false;
 	break;
       }
@@ -587,8 +584,6 @@ public abstract class Calendar implements Serializable, Cloneable
    */
   public final void set(int year, int month, int date)
   {
-    if (!areFieldsSet)
-      computeFields();
     isTimeSet = false;
     fields[YEAR] = year;
     fields[MONTH] = month;

libjava/java/util/GregorianCalendar.java

@@ -373,9 +373,17 @@ public class GregorianCalendar extends Calendar
       year = 1 - year;
 
     int[] daysOfYear = getDayOfYear(year);
-    int hour = isSet[HOUR_OF_DAY] ? fields[HOUR_OF_DAY]
-      : (isSet[HOUR] && isSet[AM_PM]
-	 ? fields[AM_PM] * 12 + (fields[HOUR] % 12) : 0);
+
+    int hour = 0;
+    if (isSet[HOUR_OF_DAY])
+      hour = fields[HOUR_OF_DAY];
+    else if (isSet[HOUR])
+      {
+	hour = fields[HOUR];
+        if (isSet[AM_PM] && fields[AM_PM] == PM)
+	  hour += 12;
+      }
+
     int minute = isSet[MINUTE] ? fields[MINUTE] : 0;
     int second = isSet[SECOND] ? fields[SECOND] : 0;
     int millis = isSet[MILLISECOND] ? fields[MILLISECOND] : 0;