1 独占锁

public class SelfLock implements Lock{
    
    //state 表示获取到锁 state=1 获取到了锁，state=0，表示这个锁当前没有线程拿到
    private static class Sync extends AbstractQueuedSynchronizer{
        
        //是否占用
        protected boolean isHeldExclusively() {
            return getState()==1;
        }
        
        protected boolean tryAcquire(int arg) {
            if(compareAndSetState(0,1)) {
                setExclusiveOwnerThread(Thread.currentThread());
                return true;
            }
            return false;
        }
        
        protected boolean tryRelease(int arg) {
            if(getState()==0) {
                throw new UnsupportedOperationException();
            }
            setExclusiveOwnerThread(null);
            setState(0);
            return true;
        }
        
        Condition newCondition() {
            return new ConditionObject();
        }
    }
    
    private final Sync sycn = new Sync();

    @Override
    public void lock() {
        sycn.acquire(1);
        
    }

    @Override
    public void lockInterruptibly() throws InterruptedException {
        sycn.acquireInterruptibly(1);
        
    }

    @Override
    public boolean tryLock() {
        return sycn.tryAcquire(1);
    }

    @Override
    public boolean tryLock(long time, TimeUnit unit) throws InterruptedException {
        return sycn.tryAcquireNanos(1, unit.toNanos(time));
    }

    @Override
    public void unlock() {
        sycn.release(1);
        
    }

    @Override
    public Condition newCondition() {
        return sycn.newCondition();
    }


}

2 共享锁

/**
 *
 *类说明：奇葩点的三元共享同步工具类
 */
public class TrinityLock   {

    //为3表示允许两个线程同时获得锁
    private final Sync sync = new Sync(3);

    private static final class Sync extends AbstractQueuedSynchronizer {
        //private static final long serialVersionUID = -7889272986162341211L;

        Sync(int count) {
            if (count <= 0) {
                throw new IllegalArgumentException("count must large than zero.");
            }
            setState(count);
        }

        public int tryAcquireShared(int reduceCount) {
            for (;;) {
                int current = getState();
                int newCount = current - reduceCount;
                if (newCount < 0 || compareAndSetState(current, newCount)) {
                    return newCount;
                }
            }
        }

        public boolean tryReleaseShared(int returnCount) {
            for (;;) {
                int current = getState();
                int newCount = current + returnCount;
                if (compareAndSetState(current, newCount)) {
                    return true;
                }
            }
        }

        final ConditionObject newCondition() {
            return new ConditionObject();
        }
    }

    public void lock() {
        sync.acquireShared(1);
    }

    public void unlock() {
        sync.releaseShared(1);
    }

    public void lockInterruptibly() throws InterruptedException {
        sync.acquireSharedInterruptibly(1);
    }

    public boolean tryLock() {
        return sync.tryAcquireShared(1) >= 0;
    }

    public boolean tryLock(long time, TimeUnit unit) throws InterruptedException {
        return sync.tryAcquireSharedNanos(1, unit.toNanos(time));
    }

    public Condition newCondition() {
        return sync.newCondition();
    }
}