虚拟银行，具有以下要求：银行于某时刻开始营业，运行若干时间后自动关门。营业期间有多名顾客随机的来银行存钱，取钱，但是只有一名工作人员提供服务。每次存取钱，银行就报告一次该顾客到当时为止存入和取出的总数及余额，银行关门时在报告一次，不允许透支。银行和顾客分别用不同的线程实现。-Virtual bank, with the following requirements: bank opened certain time, automatic closing after running some time. During more than a random customer business to the bank to save money, withdraw money, but only one staff member to provide services. Each access money, a bank report to date of the customer deposit and withdrawal of the total number and the balance, when the bank closed in a report, no overdraft. Banks and their customers are implemented in different threads.