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Threading in java

Posted by Satyapriya Nayak Blogs | Java Sep 30, 2011
In this blog we will know about threading in java.

In this blog we will know about threading in java.

 

Thread: - A single flow of control in a program is known as thread. This can execute independently in a processing environment and perform an operation. A program can be divided into different part or different sequential flow of control known as multithreaded program.

 

 

How to create a thread

 

A thread can be created by a java program by using

1.Java.lang.thread class

2.java.lang.Runnable interface

 

Creating of thread using thread class

 

1.create a class by inheriting thread class if required provide constructor to the class.

2.Override run () method to provide the logic for thread, which can execute independently, run () method contains thread body.

3.Create an interface if the class which is created in step-1

4.To start the threads execution use start () method which calls the run () method.

 

Example

 

threadDemo.java file

 

class mythread extends Thread

 {

 

    public void run()

      {

          for(int i=0;i<100;i++)

        System.out.println("Welcome to multithreading "+i );  

       } 

}

public class threadDemo

  {

      public static void main(String arg[])

     {

         System.out.println("Main Started");

        mythread m=new mythread();

        //m.setDaemon(true);

        m.start();

 System.out.println("main finished");

 

      }

}

 

Compile

 

javac threadDemo.java

java threadDemo

 

 

Creating thread using runnable interface

 

1.Create a class, which must implement java.lang.Runnable interface.

2.Override run () method to provide body of the thread.

3.Create an instance of thread class which must accepts an instance of the class created in step-1 (sub class of runnable interface).

4.Start the execution of the thread call start method in the thread class instance.

 

 

Example

 

thread_demo.java file

 

import java.util.*;

class mythread  implements Runnable

 {

            public void run()

      {

 

         Scanner sc=new Scanner(System.in);

         System.out.println("Provide ur number");

          int x=sc.nextInt();

          System.out.println("No is "+x);    

  }

 

}

public class thread_demo

  {

      public static void main(String arg[])

     {

         System.out.println("Main Started");

         mythread m1=new mythread();

  //to call run() of mythread class use its object in constructor of Thread class

        Thread th=new Thread(m1);

         th.start();

        try

      {

     //Thread.sleep(3000);

   /* join() suspends parent thread's execution till the child upon which its invoked is not finished.

isAlive() returns true if thread is not finished else false */

      if(th.isAlive())

       th.join();

       }

 catch(Exception e){}

         System.out.println("Main finished");

     }

}

 

 

Compile

 

javac thread_demo.java

java thread_demo

 

 

Difference between multiprocessing and multithreading

 

Multiprocessing

 

1.A program in execution is known as process. Multiple processes for single environment are known as multiprocessing.

 

2.Minimum unit of multiprocessing is a program.

 

3.Process occupies its own resources or memory.

 

Multithreading

 

1.A part of a program, which can execute independently, is known as Multithreading.

 

2.Minimum unit of Multithreading is thread or part of a program.

 

3.Thread occupies the resources available to its process. This also being called as lightweight process.

 

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