What is the difference between HashSet and TreeSet , LinedHashMap and HashMap , Thread and ThreadGroup , ArrayList and vector , HashMap vs Hastable , StringBuffer vs StringBuilder.
What is the importance of wrapper class , marker interface , Object class.
In DS :- LinkedList , Binary Search Tree, Hashtable .
Hierarchy of collection framework , Exception.

Question

What is the difference between HashSet and TreeSet , LinedHashMap and HashMap , Thread and ThreadGroup , ArrayList and vector , HashMap vs Hastable , StringBuffer vs StringBuilder. 
What is the importance of wrapper class , marker interface , Object class.
In DS :- LinkedList , Binary Search  Tree, Hashtable .
Hierarchy of collection framework , Exception.

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