有没有java集合包装器/集合在多线程访问时失败?

您可以尝试使用ReentrantLock包装HashMap get()和put()方法(或使用的方法):

java.util.concurrent.locks.ReentrantLock



class X {
 private final ReentrantLock lock = new ReentrantLock();

     public void m() { 
         if ( ! lock.tryLock() ) {
            // already locked, hint: lock.isHeldByCurrentThread() ?
         }
         lock.lock();
         try {
           // delegate to wrapped hashMap
         } 
         finally {
           lock.unlock()
         }
     }

I made my own :