Hello,

i have written the following code in apex:

		public String getDateDiffs(){
			List<Rental__c> tmpRents = new List<Rental__c>();
			tmpRents.addAll(getVerleih());
			List<String> strRents = new String[tmpRents.size()];
			System.debug(tmpRents.size());
			List<List<String>> listList;
				for(Integer i = 0; i < tmpRents.size();i++){
				strRents.clear();
				Date start = tmpRents.get(i).Start__c;
				Date ende = tmpRents.get(i).End__c;
				Integer toFirst = month.getfirstDate().daysBetween(start);
				Integer length = start.daysBetween(ende);
				System.debug(tmpRents.size());
				System.debug(start);
				System.debug(ende);
				System.debug(toFirst);
				System.debug(length);
				strRents.add(toFirst,'|____');
				System.debug(strRents);
					for(Integer k = toFirst+1;k < length;k++){
						strRents.add(k,'_____');
					}
				strRents.add(toFirst+length,'____|');
				listList.add(i,strRents);
				}
			return strRents.get(0);
		}

It adds a string to a list on a certain position. This position is determined by the difference between a start date from the database and the beginning of the currently selected month.

When calling the method on a visualforce page, i get the message: List Index Out of Bounds: 0

I added every variable in a System.debug() to determine where the error comes from but i am not getting any wiser from the debug log:

16:12:07.094|METHOD_ENTRY|[326]|LIST.size()
16:12:07.094|METHOD_EXIT|[326]|LIST.size()
16:12:07.094|USER_DEBUG|[326]|DEBUG|27
16:12:07.094|METHOD_EXIT|[326]|System.debug(ANY)
16:12:07.095|METHOD_ENTRY|[327]|System.debug(ANY)
16:12:07.095|USER_DEBUG|[327]|DEBUG|2010-11-01 00:00:00
16:12:07.095|METHOD_EXIT|[327]|System.debug(ANY)
16:12:07.095|METHOD_ENTRY|[328]|System.debug(ANY)
16:12:07.095|USER_DEBUG|[328]|DEBUG|2010-11-05 00:00:00
16:12:07.095|METHOD_EXIT|[328]|System.debug(ANY)
16:12:07.095|METHOD_ENTRY|[329]|System.debug(ANY)
16:12:07.095|USER_DEBUG|[329]|DEBUG|0
16:12:07.095|METHOD_EXIT|[329]|System.debug(ANY)
16:12:07.095|METHOD_ENTRY|[330]|System.debug(ANY)
16:12:07.095|USER_DEBUG|[330]|DEBUG|4
16:12:07.095|METHOD_EXIT|[330]|System.debug(ANY)
16:12:07.095|METHOD_ENTRY|[331]|LIST.add(Integer, ANY)
16:12:07.095|EXCEPTION_THROWN|[331]|System.ListException: List index out of bounds: 0
16:12:07.095|METHOD_EXIT|[331]|LIST.add(Integer, ANY)
16:12:07.095|CODE_UNIT_FINISHED|calCon invoke(getdatediffs)
16:12:07.095|CODE_UNIT_FINISHED|calCon get(datediffs)

Judging from the debug log output, the position where the '|____' is inserted would be 0.

It seems that i am doing some minor mistake that i do not see it right now.

I defined the size of the list and judging from the debug output, it should be 27 in this case.

In the documentation for the list methods, it is described as follows:

add	Integer i
Any type e
Void	Inserts an element e into the list at index position i. In the following example, a list with six elements is created, and integers are added to the first and second index positions.
List<Integer> myList = new Integer[6];
myList.add(0, 47);
myList.add(1, 52);
system.assertEquals(myList.get(1), 52);

It says for the add() method that you can have the Integer as a pointer and add the desired value.

Maybe i am overlooking something?

I would appreciate any help.

Regards,

hoomel