What is the difference between a hash in perl and a hashtable in Java? What are some concrete examples? Solution There are lot of differece between hash in perl and hashtable in java concrete Examples: 1) Insertion is done using a put method in java. It is done directly in perl In Java: data.put(\'John Paul\',45) In Perl; $data{\'John Paul\'} = 45; 2) In Java We have to specify datatypes of key and value before hand while defing the hashtable variable. It is not necessary in perl..