I know the basics of the file class and have used many of the methods.
The one I'm having trouble with the most is the renameTo() method.
It seems to return true and change the file's name half the time, but the other half return false.
I'm pretty sure it's a lock on the file that is not letting the name be changed. Below is some of
my code. Basically this method I have created
takes the files modified date and appends that to the files name and attempts to
rename the existing file with the new formatted name.

			

			private static void saveFileWithDate(String strOldFile) {
			

			File oldFile = new File(strOldFile);
			

			try {
			

			if (oldFile.exists()) {
			

			String filename = oldFile.getName();
			

			Date dateObj = new Date(oldFile.lastModified());
			

			

			try {
			

			SimpleDateFormat shortDateFormat
			

			= new SimpleDateFormat ("yyyyMMdd");
			

			strDate = shortDateFormat.format(dateObj);
			

			} catch ( Exception ex ) {
			

			catLog.error("Problem formatting date, " +strDate+ "; " + ex.getMessage());
			

			}
			

			

			int extIndex = filename.indexOf('.');
			

			String extention = "";
			

			if (extIndex>0) {
			

			extention = filename.substring(extIndex,filename.length());
			

			filename = filename.substring(0,extIndex);
			

			}
			

			

			//Here's where I create a new file instance with the modified date appended to the filename.
			

			File saveFile = new File(filename+"_"+strDate+extention);
			

			if (!oldFile.renameTo(saveFile)) {
			

			catLog.error("Rename File did not succeed.");
			

			}
			

			}
			

			} catch (Exception e) {
			

			System.out.println("Exception: " + e);
			

			}
			

			}