1.乐观锁和悲观锁 2.可重入锁和非可重入锁 (ReetrantLock为例) 3.公平锁和非公平锁 4.共享锁和排他锁 (ReetrantReadWriteLock读写锁为例) 5.自旋锁和阻塞锁 6.可中断锁