Java多线程编程4--Lock的实例--顺序打印

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使用Condition对象可以对线程执行的业务进行排序规划

public class Run {    private volatile  static int nextPrintWho = 1;    private static ReentrantLock lock = new ReentrantLock();    private final static Condition conditionA = lock.newCondition();    private final static Condition conditionB = lock.newCondition();    private final static Condition conditionC = lock.newCondition();    public static void main(String[] args) throws InterruptedException {        Thread threadA = new Thread(){            public void run() {                try {                    lock.lock();                    while (nextPrintWho != 1) {                        conditionA.await();                    }                    for (int i=0; i<3; i++) {                        System.out.println("ThreadA  " + (i+1));                    }                    nextPrintWho = 2;                    conditionA.signalAll();                } catch (InterruptedException e) {                    e.printStackTrace();                } finally {                    lock.unlock();                }            }        };        Thread threadB = new Thread(){            public void run() {                try {                    lock.lock();                    while (nextPrintWho != 2) {                        conditionB.await();                    }                    for (int i=0; i<3; i++) {                        System.out.println("ThreadB  " + (i+1));                    }                    nextPrintWho = 3;                    conditionB.signalAll();                } catch (InterruptedException e) {                    e.printStackTrace();                } finally {                    lock.unlock();                }            }        };        Thread threadC = new Thread(){            public void run() {                try {                    lock.lock();                    while (nextPrintWho != 3) {                        conditionC.await();                    }                    for (int i=0; i<3; i++) {                        System.out.println("ThreadC  " + (i+1));                    }                    nextPrintWho = 1;                    conditionC.signalAll();                } catch (InterruptedException e) {                    e.printStackTrace();                } finally {                    lock.unlock();                }            }        };        Thread[] aArray = new Thread[5];        Thread[] bArray = new Thread[5];        Thread[] cArray = new Thread[5];        for (int i=0; i<5; i++) {            aArray[i] = new Thread(threadA);            bArray[i] = new Thread(threadB);            cArray[i] = new Thread(threadC);            aArray[i].start();            bArray[i].start();            cArray[i].start();        }    }}

ThreadA 1
ThreadA 2
ThreadA 3
ThreadB 1
ThreadB 2
ThreadB 3
ThreadC 1
ThreadC 2
ThreadC 3
ThreadA 1
ThreadA 2
ThreadA 3
ThreadB 1
ThreadB 2
ThreadB 3
ThreadC 1
ThreadC 2
ThreadC 3
ThreadA 1
ThreadA 2
ThreadA 3
ThreadB 1
ThreadB 2
ThreadB 3
ThreadC 1
ThreadC 2
ThreadC 3
......按顺序打印

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