java多线程编程技术详解和实例代码

// Fig. 4.1: PrintTask.java  // PrintTask class sleeps for a random time from 0 to 5 seconds  import java.util.Random;     public class PrintTask implements Runnable   {    private final int sleepTime; // random sleep time for thread    private final String taskName; // name of task    private final static Random generator = new Random();        public PrintTask( String name )    {     taskName = name; // set task name           // pick random sleep time between 0 and 5 seconds     sleepTime = generator.nextInt( 5000 ); // milliseconds    } // end PrintTask constructor       // method run contains the code that a thread will execute    public void run()    {     try // put thread to sleep for sleepTime amount of time      {       System.out.printf( "%s going to sleep for %d milliseconds.\n",         taskName, sleepTime );       Thread.sleep( sleepTime ); // put thread to sleep     } // end try         catch ( InterruptedException exception )     {       System.out.printf( "%s %s\n", taskName,        "terminated prematurely due to interruption" );     } // end catch           // print task name     System.out.printf( "%s done sleeping\n", taskName );     } // end method run  } // end class PrintTask