Java Concept differences

List	ArrayList	LinkedList	Vector	Array
1	Flexible	Flexible	Flexible	Fixed
2	Unsynchronized	Unsynchronized	Synchronized	Unsynchronized
Set	HashSet	LinkedHashSet	TreeSet
1	Unordered	Inserted order	Ordered
2	UnSynchronized	Unsynchronized	Unsynchronized
Map	HashMap	LinkedHashMap	TreeMap	HashTable
1	Stored in Hash	Hash	Tree	Hash
2	Unsynchronized	Unsynchronized	Synchronized	Synchronized
3	Unordered	Inserted order	Ordered	Unordered
4	Null allowed	Null allowed	Null allowed	Null not allowed
Itrn	Iterator	IteratorList	Enumerator
1	One by one	One by one	More than one
2	Remove Ele	Remove Ele	Can not
3	Unidirectional	Bidirectional
	String	StringBuffer	StringBuilder
1	Immutable	Mutable	Mutable
2	Unsynchronized	Synchronized	UnSynchronized

# Differences of Exceptions and Errors

Sl. No	Exceptions	Errors
1	Exception is an abnormal condition raised while executing the program	Error is a condition that doesn’t occur under normal conditions Ex: run out of memory, stack over flow.

#Differences of final, finally and finalized.

Final	Finally	Finalized
We can apply the final keyword to variables, methods and classes. If a variable is declared as final we can’t change the values. if method is declared as final we can’t override. if class is declared as final we can’t subclasses	whether an exception is raised or not finally block must execute	All objects have finalized method. It is inherited from Object class. It is used to release system resources. Giving a chance to object free their resources before destroying. It is called prior to garbage collector.

# Differences of functions

Wait()	Sleep()	Suspend()	Notify()	Notifyall()	Join()
Blocked until certain condition occurs -notify()	Blocked for a specified time	Blocked until further orders -resume()	it is used to bring waiting thread to run able state	It is used to bring all waiting thread to run able state	Waiting for thread to finish or die.