一个简单的java锁Lock的实现

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();
}

}