wait/notify incorrect use!

in c-020_01_interview NotifyFreeLock.java

wait should in a while loop.
=====
ew Thread(() -> {
			synchronized(lock) {
				System.out.println("t2启动");
				if(c.size() != 5) {
					try {
						lock.wait();
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
				System.out.println("t2 结束");
				//通知t1继续执行
				lock.notify();
			}
			
		}, "t2").start();