多个线程按顺序循环打印线程独有的字符串

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package multithreading.analysis;import java.util.LinkedList;import java.util.Queue;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.LinkedBlockingQueue;import java.util.concurrent.TimeUnit;import java.util.concurrent.locks.Condition;import java.util.concurrent.locks.ReentrantLock;import org.junit.Test;/** * n个线程,每个线程打印的数字不一样,必须按顺序打印 * @author mxipjs * */public class AQSTest {    private static ReentrantLock rtl = new ReentrantLock();     private static Queue<Condition> queue = new LinkedList<Condition>();    @Test    public void test() throws InterruptedException{        ExecutorService exec = Executors.newCachedThreadPool();        for(int i=0;i<20;i++){            Condition con = rtl.newCondition();            queue.offer(con);            exec.execute(new PrintC(con,i+""));        }        TimeUnit.SECONDS.sleep(1);        rtl.lock();        try {            PrintC.signal(queue); //开始通知第一个打印线程        }finally {            rtl.unlock();        }        exec.shutdown();        while(Thread.activeCount()>2){            Thread.yield();        }        System.out.println("over");    }    static class PrintC implements Runnable {        private String printStr;        private static ThreadLocal<Integer> count = new ThreadLocal<Integer>(){            protected Integer initialValue() {                return new Integer(3);            };        };        private Condition con;        public PrintC(Condition con,String str) {            this.con = con;            this.printStr = str;        }        @Override        public void run() {            while(count.get()>0){                rtl.lock();                try {                    con.await();                    System.out.println(printStr);                    signal(queue);                    count.set(count.get()-1);                } catch (InterruptedException e) {                    e.printStackTrace();                } finally{                    rtl.unlock();                }            }        }        public static void signal(Queue<Condition> queue){            Condition tempCondition = queue.poll();            tempCondition.signal();            queue.offer(tempCondition);        }    }}
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