HashMap Vs HashTable
Hash table based implementation of the Map interface. This implementation provides all of the optional map operations, and permits null values and the null key. (The HashMap class is roughly equivalent toHashtable, except that it is unsynchronized and permits nulls.) This class makes no guarantees as to the order of the map; in particular, it does not guarantee that the order will remain constant over time.
To enable Windows 8.3 file naming setting use fsutil command Example: c:\> fsutil 8dot3name set C: 0