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Implementing Threads in java

The thread is nothing but a single piece of program or process, for any program, there will be the main thread and some other threads. Implementing thread in java is a two steps process.

1) First of all, we have to define a function which can be executed as a thread.

2) Now, this function has to be executed as a thread.'

Explanation:

a) The signature of a function using which we implement a thread is defined in an interface by name ‘Runnable’. This interface has one function definition public void run () for which we need to provide body.

b) After providing body, we need to execute this functionality as a thread (i.e. simultaneously with other parts of the program).

c) There is a class by name Thread present in the API. This class supports much functionality which makes a given functionality to get executed as a thread. One such functionality is the start () method.

d) The start () method recognizes the run () method of Runnable interface and then the run () method is executed as a thread.

e) Thread class and Runnable interface are the two structures using which we implement Thread-based multitasking in java.

Examples:

Interface Runnable

{

Public void run ();

}

Class thread implements Runnable

{

Public void run ()

{

-----------------------

}

-------------------------------------------------------------------------------------------

}

Implement threads either of the following two ways:

Class A implements Runnable

{

Public void run ()

{

}

--------------------------------------------------------------------------------------------

}

Or

Class A extends Thread

{

Public void run ()

{

}

---------------------------------------------------------------------------------------------

}

a) Whether we extend thread class or implement the Runnable interface directly, we are using run () method of the runnable interface i.e. using Runnable interface directly or indirectly compulsory.

b) So by using Runnable interface, we can define threads in java.

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