Monday, 16 January 2017

Java Tutorial: Java Threads (How to get the active count of Thread group | Thread group in Java)


Click here to watch in Youtube: 
https://www.youtube.com/watch?v=jigYKdRC7WA&list=UUhwKlOVR041tngjerWxVccw

MyRunnable.java
public class MyRunnable implements Runnable
{
    public void run()
    {
        try
        {
            Thread.sleep(1000);
        }
        catch (InterruptedException e)
        {
            e.printStackTrace();
        }
        System.out.println("Run by = "+Thread.currentThread().getName());
    }
}
ThreadGroupDemo.java
/*
 * public int activeCount()
 * 
 * Returns an estimate of the number of active threads
 * in this thread group and its subgroups.
 */
public class ThreadGroupDemo
{
    public static void main(String[] args) throws InterruptedException
    {
        MyRunnable myRunnable = new MyRunnable();

        ThreadGroup parentTg = new ThreadGroup("Parent ThreadGroup");

        Thread t1 = new Thread(parentTg, myRunnable, "thread1");
        Thread t2 = new Thread(parentTg, myRunnable, "thread2");

        t1.start();
        t2.start();

        ThreadGroup childTg = new ThreadGroup(parentTg, "Child ThreadGroup");

        Thread t3 = new Thread(childTg, myRunnable, "thread3");
        t3.start();
        Thread t4 = new Thread(childTg, myRunnable, "thread4");
        t4.start();
        Thread t5 = new Thread(childTg, myRunnable, "thread5");
        t5.start();

        // display the number of active threads
        System.out.println("Active threads in \"" + childTg.getName() + "\" = "
                + childTg.activeCount());

        // display the number of active threads
        System.out.println("Active threads in \"" + parentTg.getName()
                + "\" = " + parentTg.activeCount());

    }
}
Output
Active threads in "Child ThreadGroup" = 3
Active threads in "Parent ThreadGroup" = 5
Run by = thread2
Run by = thread4
Run by = thread3
Run by = thread5
Run by = thread1

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/ThreadDemo_TG_ActiveCount_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/ThreadDemo_TG_ActiveCount_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/0e65b153b8d122db36492a0722000b1e2ed1fbd9/BasicJava/ThreadDemo_TG_ActiveCount_App/?at=master

See also:
  • All JavaEE Viedos Playlist
  • All JavaEE Viedos
  • All JAVA EE Links
  • Servlets Tutorial
  • All Design Patterns Links
  • JDBC Tutorial
  • Java Collection Framework Tutorial
  • JAVA Tutorial
  • Kids Tutorial
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