|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 keys.
|Hashtable doesn’t guarantee any kind of order.|
|Iterator in HashMap is fail-fast.||Enumerator in Hashtable is not fail-fast.|
Overview In a project, there might be a use case where you need to re-invoke a failed operation or call a method again on failure. Spring Retry provides declarative retry support for Spring applications. In Read more…