Folks,<P>Being a Perl hacker, I'm having a bit of a hard time figuring out how to do some things in Java...<P>In Perl, I constantly use hashes of hashes to store lots of data in memory, in key-value ...

While the Hashtable was part of the initial Java release over two decades ago, the HashMap is the correct key-value store to use today. One key HashMap vs. Hashtable difference is the fact that the ...