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多线程之间按顺序调用，实现A->B->C三个线程启动，要求如下：

  AA打印5次，BB打印10次，CC打印15次 接着AA打印5次，BB打印10次，CC打印15次

1. 高聚低合前提下，线程操作资源类
2. 判断/干活/通知
3. 多线程交互中，必须防止多线程的虚假唤醒，也即（判断只能用while，不能用if）
4. 标志位

//三个操作方法的版本import java.util.concurrent.locks.Condition;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;class ShareResource{       private int number = 1;  //1:A, 2:B, 3:C    private Lock lock = new ReentrantLock();    private Condition condition1 = lock.newCondition();    private Condition condition2 = lock.newCondition();    private Condition condition3 = lock.newCondition();    public void print5(){           lock.lock();        try{               while(number!=1){                   condition1.await();            }            for (int i = 0; i < 5; i++) {                   System.out.println(Thread.currentThread().getName()+"\tA");            }            number = 2;            condition2.signal();        }catch(Exception e){               e.printStackTrace();        }finally{               lock.unlock();        }    }    public void print10(){           lock.lock();        try{               while(number!=2){                   condition2.await();            }            for (int i = 0; i < 10; i++) {                   System.out.println(Thread.currentThread().getName()+"\tB");            }            number = 3;            condition3.signal();        }catch(Exception e){               e.printStackTrace();        }finally{               lock.unlock();        }    }    public void print15(){           lock.lock();        try{               while(number!=3){                   condition3.await();            }            for (int i = 0; i < 15; i++) {                   System.out.println(Thread.currentThread().getName()+"\tC");            }            number = 1;            condition1.signal();        }catch(Exception e){               e.printStackTrace();        }finally{               lock.unlock();        }    }}public class ThreadOrderAccess {       public static void main(String[] args) {           ShareResource shareResource = new ShareResource();        new Thread(()->{               for (int i = 0; i < 10; i++) {                   shareResource.print5();            }        },"thread1").start();        new Thread(()->{               for (int i = 0; i < 10; i++) {                   shareResource.print10();            }        },"thread2").start();        new Thread(()->{               for (int i = 0; i < 10; i++) {                   shareResource.print15();            }        },"thread3").start();    }}

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