/** *//** * 一个产生deadlock的例子 * @author midi * */public class Deadlock extends Object ...{ private String objID; public Deadlock(String id) ...{ objID = id; } public synchronized void checkOther(Deadlock other) ...{ print("entering checkOther()"); // simulate some lengthy process try ...{ Thread.sleep(2000); } catch (InterruptedException x) ...{ } print("in checkOther() - about to " + "invoke 'other.action()'"); other.action(); print("leaving checkOther()"); } public synchronized void action() ...{ print("entering action()"); // simulate some work here try ...{ Thread.sleep(500); } catch (InterruptedException x) ...{ } print("leaving action()"); } public void print(String msg) ...{ threadPrint("objID=" + objID + " - " + msg); } public static void threadPrint(String msg) ...{ String threadName = Thread.currentThread().getName(); System.out.println(threadName + ": " + msg); } public static void main(String[] args) ...{ final Deadlock obj1 = new Deadlock("obj1"); final Deadlock obj2 = new Deadlock("obj2"); Runnable runA = new Runnable() ...{ public void run() ...{ obj1.checkOther(obj2); } }; Thread threadA = new Thread(runA, "threadA"); threadA.start(); try ...{ Thread.sleep(200); } catch (InterruptedException x) ...{ } Runnable runB = new Runnable() ...{ public void run() ...{ obj2.checkOther(obj1); } }; Thread threadB = new Thread(runB, "threadB"); threadB.start(); try ...{ Thread.sleep(5000); } catch (InterruptedException x) ...{ } threadPrint("finished sleeping"); threadPrint("about to interrupt() threadA"); threadA.interrupt(); try ...{ Thread.sleep(1000); } catch (InterruptedException x) ...{ } threadPrint("about to interrupt() threadB"); threadB.interrupt(); try ...{ Thread.sleep(1000); } catch (InterruptedException x) ...{ } threadPrint("did that break the deadlock?"); }}