Answer Posted / royal
It is introduced in java 2 before to that there are five legacy classes and one legacy interface
Vector
HashTable
Properties legacy classes Eenumeration legacy interface
Dictionary
Stack
There are some problem in above listed legacy classes to avoid these problem Sun has introduced collection framework in Java 2.
In the collection frame work there are the three different category:--------
List :----- collection of object with duplicate.
Set :----- collection of object without duplicate.
Map :--- collection of key value pairs
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