Learning multithreading for the first time--writing a thread pool yourself

1  PackageCom.lovo.threadpool;2 3  Public classThreadofpoolextendsthread{4     PrivateRunnable task =NULL;5     PrivateThreadPool ThreadPool;6     Private BooleanStop =false;//Thread State7      PublicThreadofpool () {8     }9      PublicThreadofpool (ThreadPool ThreadPool) {Ten          This. ThreadPool =ThreadPool; One     } A     /** - * Assign a thread to a specified task -      * @paramTask the      */ -      Public synchronized voidsettask (Runnable Task) { -          This. Task =task; - notify (); +     } -     /** + * Thread Execution A      */ at     Private synchronized voidExecuteTask () { -          while(!stop) { -              while(!stop && Task = =NULL) { -                 Try { - wait (); -}Catch(interruptedexception e) { inStop =true; -                 } to             } +             if(Task! =NULL) { - Task.run (); theTask =NULL; *Threadpool.free ( This); $             }Panax Notoginseng         } -     } the @Override +      Public voidrun () { A ExecuteTask (); the     } +      PublicRunnable Gettask () { -         returntask; $     } $      Public voidSetstop (Booleanstop) { -          This. Stop =stop; -     } the      -}

1  PackageCom.lovo.threadpool;2 3 Importjava.util.ArrayList;4 Importjava.util.List;5 6  Public classThreadPool {7     PrivateList<thread> freethreads =NewArraylist<thread> ();//idle Thread (available)8     PrivateList<thread> usingthreads =NewArraylist<thread> ();//threads being used (not available)9     Private intPool_size = 5;Ten      PublicThreadPool () { One          This(pool_size); A     } -      PublicThreadPool (intnum) { -Pool_size =num; the          for(inti = 0; i < pool_size; i++) { -Threadofpool Tempthread =NewThreadofpool ( This); - Tempthread.start (); - Freethreads.add (tempthread); +         } -     } +     /** A * Assigning a thread at      * @paramT -      */ -      Public synchronized voidExecute (Runnable t) { -          while(Freethreads.isempty ()) { - //System.out.println ("thread pool busy, please wait!") "); -             Try { in wait (); -}Catch(interruptedexception e) { to e.printstacktrace (); +             } -         } theThreadofpool tempthread= (Threadofpool) Freethreads.remove (Freethreads.size ()-1); * Usingthreads.add (tempthread); $ Tempthread.settask (t);Panax Notoginseng     } -     /** the * After the allocated thread is exhausted, the recycling process +      * @paramThreadofpool A      */ the      Public synchronized voidFree (Threadofpool threadofpool) { + Usingthreads.remove (threadofpool); - Freethreads.add (threadofpool); $ notify (); $     } -     /** - * Close thread pool the      */ -      Public voidClose () {Wuyi          while(Freethreads.size () <pool_size) {} the          for(Thread thread:freethreads) { - Thread.Interrupt (); Wu         } -     } About}

Learning multithreading for the first time--writing a thread pool yourself