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Q) How to implement Multithreading in java?



A)
->to make java applications multithreaded, java language support available through 2 modifiers.
1) volatile
2) synchronized
API support (i.e. library support) is also available through a library class and an interface. 
1)      java.lang.Thread ( Thread is a class) 
2)      java.lang.Runnable ( Runnable is a interface)

Steps to develop a multithreaded application:
Step 1:
            Find out how many concurrent tasks that application may have to perform ( i.e. how many flows is there in our program i.e. analyzing in first step).
Step 2:
            Define a user class that extends java.lang.Thread class or implements java.lang.Runnable interface.
Step 3:
            Override run () method and place task performing code in that method directly or indirectly.
Step 4:
            Create as no. of Thread objects of required either instantiating java.lang.Thread class or its user defined sub class.
Step 5:
            Activate the Threads.

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