MultiThreading in Java

If you know about the threads in java than it is easy for you to understand multithreading.

By default in every java program one thread is available.

Thread is basically a lightweight sub-process , a smallest unit of processing .Multiprocessing and Multithreading , both are used to achieve multitasking.

A thread can be in one of the following States:

 New – A thread that has not yet Started is in this State.

Blocked – A thread that is blocked waiting for a monitor lock is in this state.

Timed_waiting –A thread that is waiting for another thread to perform an action for up to a

                             Specified waiting time is in this state .

Terminated – A thread that has exited is in this state. 

 Multithreading means more than one thing are correlated to each others. In java multithreading program  contains two or more parts that can run concurrently and each part can handle different task at the same time making optimal use of the available resources specially when your computer has multiple CPUs.

Two ways of using multithread:

1)      Create a class that implement Runnable  interface :

->define run method à Public void run();

->instantiate a thread object  à thrad (Runnable threadobj,String threadname);

-> start thread  à void start();

   2) Create a thread by extending a thread class :

       ->  override run method available in thread class. à void run();

       -> Start thread by calling Start method ,which execute a call to Run method. à void Start();

Examples:

        1) You see object in games like cars, motor bikes etc.

2) When you are working in MS word hen threads are running in background like as spelling checker ,formatting and many others.