阿里面试题多线程打印问题

• package bingFaBianCheng17;
  
  import java.sql.Connection;
  import java.util.concurrent.atomic.AtomicInteger;
  import java.util.concurrent.locks.Condition;
  import java.util.concurrent.locks.ReentrantLock;
  
  public class test8 {
         
  
      static boolean a = false;
      static boolean b = false;
      static boolean c = false;
  
      public static void main(String[] args) throws InterruptedException {
         
  
          ReentrantLock lock = new ReentrantLock();
          Condition c1 = lock.newCondition();
          Condition c2 = lock.newCondition();
          Condition c3 = lock.newCondition();
  
          AtomicInteger ai= new AtomicInteger(0);
          AtomicInteger bi = new AtomicInteger(0);
          AtomicInteger ci = new AtomicInteger(0);
  
  
  
          Thread A = new Thread(new Runnable() {
         
              @Override
              public void run() {
         
  
                  try {
         
                      lock.lock();
                      while(!a){
         
                          c1.await();
                      }
                      while(ai.get()<10){
         
                          ai.incrementAndGet();
                          System.out.println("A");
                          b = true;
                          c2.signal();
                          if (ai.get()>=10){
         
                              break;
                          }else {
         
                              c1.await();
                          }
                      }
                  } catch (InterruptedException e) {
         
                      e.printStackTrace();
                  } finally {
         
                      lock.unlock();
                  }
  
  
              }
          },"A");
  
          Thread B = new Thread(new Runnable() {
         
              @Override
              public void run() {
         
  
                  try {
         
                      lock.lock();
                      while(!b){
         
                          c2.await();
                      }
                      while(bi.get()<10){
         
                          bi.incrementAndGet();
                          System.out.println("B");
                          c=true;
                          c3.signal();
                          if (bi.get()>=10){
         
                              break;
                          }else {
         
                              c2.await();
                          }
                      }
                  } catch (InterruptedException e) {
         
                      e.printStackTrace();
                  } finally {
         
                      c = true;
                      lock.unlock();
                  }
  
              }
          },"B");
  
          Thread C = new Thread(new Runnable() {
         
              @Override
              public void run() {
         
  
                  try {
         
                      lock.lock();
                      while(!c){
         
                          c3.await();
                      }
                      while(ci.get()<10){
         
                          ci.incrementAndGet();
                          System.out.println("C");
                          c1.signal();
                          if (ci.get()>=10){
         
                              break;
                          }else {
         
                              c3.await();
                          }
                      }
                  } catch (InterruptedException e) {
         
                      e.printStackTrace();
                  } finally {
         
                      lock.unlock();
                  }
  
              }
          },"C");
  
  
          A.start();
          B.start();
          C.start();
  
          Thread.sleep(1000);
          lock.lock();
          a = true;
          c1.signal();
          lock.unlock();
  
          A.join();
          B.join();
          C.join();
  
  
  
          System.out.println("任务完毕");
  
      }
  
  
  }