一個簡單的java鎖Lock的實現

public class Lock {

    private volatile boolean isLocked      = false;
    private Thread           lockingThread = null;

    public synchronized void lock() throws InterruptedException {
        while (isLocked) {
            wait();
        }
        isLocked = true;
        lockingThread = Thread.currentThread();
    }

    public synchronized void unLock() {
        if (this.lockingThread != Thread.currentThread()) {
            throw new IllegalMonitorStateException("Calling thread has not locked this lock");

        }
        isLocked = true;
        lockingThread = null;
        notify();
    }

}