Java线程：新特征-条件变量(6)

假如我们不用锁和条件变量，如何实现此功能呢？下面是实现代码： public synchronized void saving(int x, String name) {
                if (x > 0) {
                        cash += x;                    //存款
                        System.out.println(name + "存款" + x + "，当前余额为" + cash);
                }
                notifyAll();            //唤醒所有等待线程。
        }

public synchronized void drawing(int x, String name) {
                if (cash - x < 0) {
                        try {
                                wait();
                        } catch (InterruptedException e1) {
                                e1.printStackTrace();
                        }
                } else {
                        cash -= x;                     //取款
                        System.out.println(name + "取款" + x + "，当前余额为" + cash);
                }
                notifyAll();             //唤醒所有存款操作
        }