JUC之锁绑定多个条件Condition

川长思鸟来 2023-06-23 15:23 17阅读 0赞

# **锁绑定多个条件Condition** #

package Lock;
    /*
    * 题目：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，BB打印10次，CC打印15次
    * 来10轮
    * */
    
    //线程操纵资源类
    
    import java.util.concurrent.locks.Condition;
    import java.util.concurrent.locks.Lock;
    import java.util.concurrent.locks.ReentrantLock;
    
    class ShareResource  {
        private int number =1;//A:1 B:2 C:3
        private Lock lock =new ReentrantLock();
        private Condition c1 =lock.newCondition();
        private Condition c2 =lock.newCondition();
        private Condition c3 =lock.newCondition();
    
         public void print5(){
             lock.lock();
          try {
              //1 判断
        while (number != 1){
        c1.await();
    }
            //    2，干活
              for (int i = 1; i <=5 ; i++) {
                  System.out.println(Thread.currentThread().getName() + "\t" + i);
              }
              //    3.通知
               number=2;
              c2.signal();
          }catch (Exception e){
              e.printStackTrace();
          }finally {
              lock.unlock();
          }
        }
        public void print10(){
            lock.lock();
            try {
                //1 判断
                while (number != 2){
                    c2.await();
                }
                //    2，干活
                for (int i = 1; i <=10 ; i++) {
                    System.out.println(Thread.currentThread().getName() + "\t" + i);
                }
                //    3.通知
                number=3;
                c3.signal();
            }catch (Exception e){
                e.printStackTrace();
            }finally {
                lock.unlock();
            }
        }
        public void print15(){
            lock.lock();
            try {
                //1 判断
                while (number != 3){
                    c3.await();
                }
                //    2，干活
                for (int i = 1; i <=15 ; i++) {
                    System.out.println(Thread.currentThread().getName() + "\t" + i);
                }
                //    3.通知
                number=1;
                c1.signal();
            }catch (Exception e){
                e.printStackTrace();
            }finally {
                lock.unlock();
            }
        }
    }
    public class SyncAndReentrantLockDemo {
        public static void main(String[] args) {
            ShareResource shareResource = new ShareResource();
    
                new Thread(() -> {
                    for (int i = 1; i <= 10; i++) {
                        shareResource.print5();
                    }
                }, "AA").start();
    
                new Thread(() -> {
                    for (int i = 1; i <= 10; i++) {
                        shareResource.print10();
                    }
                }, "BB").start();
    
               new Thread(() -> {
                    for (int i = 1; i <= 10; i++) {
                        shareResource.print15();
                    }
                }, "CC").start();
            }
        }

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Lock.SyncAndReentrantLockDemo
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    Process finished with exit code 0