Methods of Java Hashtable class. It is used to reset the hash table. It returns a shallow copy of the Hashtable. It is used to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).Click to see full answer. Correspondingly, what is Hashtable in Java?Hashtable was part of the original java. util and is a concrete implementation of a Dictionary. Like HashMap, Hashtable stores key/value pairs in a hash table. When using a Hashtable, you specify an object that is used as a key, and the value that you want linked to that key.Also, how Hashtable works internally in Java with example? Hashtable internally contains buckets in which it stores the key/value pairs. The Hashtable uses the key's hashcode to determine to which bucket the key/value pair should map. The function to get bucket location from Key's hashcode is called hash function. A hash function always returns a number for an object. People also ask, why Hashtable is used in Java? Hashtable in Java. This class implements a hash table, which maps keys to values. Any non-null object can be used as a key or as a value. To successfully store and retrieve objects from a hashtable, the objects used as keys must implement the hashCode method and the equals method.Which is better HashMap or Hashtable?Hashtable is synchronized, whereas HashMap is not. This makes HashMap better for non-threaded applications, as unsynchronized Objects typically perform better than synchronized ones. Hashtable does not allow null keys or values. HashMap allows one null key and any number of null values.