私人订制可重入锁

话不多说，看代码！

public class MyLock implements Lock {

    private volatile boolean lockflag = false;
    private int count;
    private Thread threadby = null;
    @Override
    public synchronized void lock() {
        if(lockflag == true && threadby != Thread.currentThread()){
            try {
                wait();
            } catch (InterruptedException e) {
            }
        }
        lockflag = true;
        threadby = Thread.currentThread();
        count++;

    }

    @Override
    public void lockInterruptibly() throws InterruptedException {

    }

    @Override
    public boolean tryLock() {
        return false;
    }

    @Override
    public boolean tryLock(long time, TimeUnit unit) throws InterruptedException {
        return false;
    }

    @Override
    public synchronized void unlock() {

        if(threadby == Thread.currentThread()){
            count--;
            if(count==0) {
                lockflag = false;
                notify();
            }
        }

    }

    @Override
    public Condition newCondition() {
        return null;
    }
}

别的都没重写，就重写了lock,unlock，不过面试够用了！