Notes

Multithreading

Thread based process

• Faster
• Cuz these processes running on same memory

Two ways to create thread in java

Life cycle of thread:

Every application in java are single threaded

Sequence is not predictable in the case of multithreading

• The execution shifts between the tasks of different processes is known as heavyweight process .Therefore ,Inter process
  communication is always slower
  Exp :
  Running MicrosoftWord , Notepad , Different instance of Calculator, all works on multiple process .

Implementing runnable is the best practise
Cuz it can be extended

Race Condition

Extending Thread	Implementing Runnable
Basicallyfor creating worker thread	Basically for defining task
It itself is a Thread Simple syntax	Thread object wraps Runnable object
Can not extend any other class	Can extend any other class
A functionality is executed only once on a thread instance	A functionality can be executed more than once by multiple worker threads
Concurrent framework does have limited support	Concurrent framework provide extensive support
Thread’s life cycle methods like interrupt() can be overridden	Only run() method can be overridden

Synchronized block

• Used to synchronize a part of the method
• Should’nt be used unnecessaryly

Must be used inside synchronized block or method

• Wait()
• notify()
• notifyAll()

If used outside of Synchronized block it throws exception: Illigal–