for file cache i use file.lastModified()
if smaller then my cahce time for example if file wasnt modified for 8 hours
it will be deleted
and when you access that file use
file.setLastModified(System.currentTimeMillis());
int timeout = 60 * 60 * main.imagecache; //main.imagecachen int hours for
keeping image in cache
long ts = System.currentTimeMillis() / 1000 - timeout;
if((file.lastModified() / 1000) < ts){
file.delete();
}
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