Thread.txt

1)diff btw wait and sleep
->sleep()
	belongs to Thread Class
	keep the hold on the lock
	it will completes its time span specificed
	static method
	sleep(long millis);sleep(long millis,int nanos)
	no need of sunchronized context
  wait()
	belongs to Object Class
	releases the lock
	it can completes its time span until notified
	non static method
	wait();wait(long millis);wait(long millis,int nanos)
	should be called from synchronized context otherwise IllegalMonitorStateException
	
2)What is the difference between processes and threads?
->process:
	An instance of program
	heavy weight
	independent menory
  thread
	subset of program
	light weight
	shared memory

3)Differences Between Lock API and Synchronized Block
	1)lock and unlock operation can be done from separate methods.Unlike synchronized block which is present inside a single method.
	2)trylock enable thread to avoid getting blocked when other thread has a hold on the lock
	3)Based on condition we can make the thread to enter wait state(Condition interface)
	4)Lock provides fair lock management.It can allow long waiting thread to aquire lock

4)What are some of the improvements in Concurrency API in Java 8?
->ConcurrentHashMap compute(), forEach(), forEachEntry(), forEachKey(), forEachValue(), merge(), reduce() and 
search() methods.
CompletableFuture that may be explicitly completed (setting its value and status).
Executors newWorkStealingPool() method to create a work-stealing thread pool using all available processors as its target parallelism level.

5)diff btw Collection.synchronizedList() and CopyOnWriteArrayList



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