handlerthread.java

java 完全探索的随书源码

public class HandlerThread extends Thread
{
  // The default constructor for the HandlerThread
  public HandlerThread( ThreadGroup ownerGroup, String threadName )
  {
    super( ownerGroup, threadName );
  }
  // Override the parents run to do something different
  public void run()
  {
    // How many worker treads to start up
    int numberOfChildren = 3;
    // Declare the reference outside of the loop for better  performance
    WorkerThread childThread = null;
    // Loop through and start up the worker threads
    for( int i = 1; i <= numberOfChildren; i++ )
    {
      childThread = new WorkerThread( getThreadGroup(),
                                      "Thread" + String.valueOf(i) );
      childThread.start();
    }
    // Go to sleep for 3 seconds and let the worker threads so something
    try
    {
      sleep( 3000 );
    }
    catch( InterruptedException ex )
    {
      /* Don't need to handle this for now */
    }

    // Get the thread group that I belong to
    ThreadGroup myGroup = getThreadGroup();
    // how many active threads are in my group that I need to stop
    int activeEstimatedThreadCount = myGroup.activeCount();
    Thread[] activeThreads = new Thread[ activeEstimatedThreadCount ];
    // Get the count of active threads
    int activeThreadCount = myGroup.enumerate( activeThreads );
    // Declare the refererence outside of the loop for performance
    Thread thread = null;
    // Loop through all of the active threads and signal them to quit
    for( int counter = 0; counter < activeThreadCount; counter++ )
    {
      // Get one of the active threads out of the array
      thread = activeThreads[counter];
      // Make sure it's a worker thread. There may be others active
      // If it is a worker thread, tell it to stop running
      if ( thread instanceof WorkerThread )
        ((WorkerThread)thread).setKeepRunning(false);
    }
  }

  public static void main( String args[] )
  {
    // Create a new ThreadGroup
    ThreadGroup threadGroup = new ThreadGroup( "MyNewGroup" );
    // Start the handler which will start the worker threads
    HandlerThread handler = new HandlerThread( threadGroup, "HandlerThread" );
    // Start the handler thread running
    handler.start();
  }
}