Java ThreadGroup checkAccess() method with Examples

by Online Tutorials Library July 22, 2022

Java ThreadGroup checkAccess() method

The activeCount() method of ThreadGroup class determines if the currently running thread has permission to modify the thread group.

Syntax

Return

It doesn’t return any value.

Exception

SecurityException: This exception throws if the current thread is not allowed to access the thread group.

Example

  class NewThread extends Thread   {      NewThread(String threadname, ThreadGroup tg)      {          super(tg, threadname);      }      public void run()      {          for (int i = 0; i < 10; i++)           {              try              {                  Thread.sleep(10);              }              catch (InterruptedException ex)               {                System.out.println(Thread.currentThread().getName() + ” interrupted”);              }          }          System.out.println(Thread.currentThread().getName() + ” completed executing”);      }  }   public class ThreadGroupCkeckAccessExp  {      public static void main(String arg[]) throws InterruptedException, SecurityException      {          // creating a ThreadGroup          ThreadGroup g1 = new ThreadGroup(“Parent thread”);          // creating a child ThreadGroup for parent ThreadGroup          ThreadGroup g2 = new ThreadGroup(g1, “child thread”);            // creating a thread           NewThread t1 = new NewThread(“Thread-1”, g1);          t1.start();          // creating another thread           NewThread t2 = new NewThread(“Thread-2″, g1);          t2.start();                    // Check for access permission of current running thread          g1.checkAccess();          System.out.println(g1.getName() + ” has access”);          g2.checkAccess();          System.out.println(g2.getName() + ” has access”);      }  }  

Test it Now

Output:

Parent thread has access  child thread has access  Thread-1 finished executing  Thread-2 finished executing

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