Collections

Difference between Hashtable and HashMap

Based on my previous posts related to Hashtable and HashMap let’s see the difference. HashMap Hashtable Non-Synchronized. Fast. Synchronized. Slow Allows one null key and any number of null values. Hashtable doesn’t allow null keys and null values. Use LinkedHashMap to maintains the insertion order. TreeMap to sort mappings based on the ascending order of Read more…

By Ashish, ago
Collections

HashMap in Java

We will find out answers for following question What is HashMap Common methods available HashMap HashMap is a Map based collection class that is used to store Key & value pairs. It is denoted as HashMap<Key, Value> or HashMap<K, V>. This class makes no guarantees as to the order of Read more…

By Ashish, ago