利用Java中提供的类和事件处理模型，编写一个运行时的电子时钟。-Classes provided by Java and event handling model, write a run-time electronic clock.

问卷调查管理系统,具有问卷的设计、修改、发布、回收和统计等多项功能-Questionnaire survey management system, has the questionnaire design, modify, publish, recycling and statistical functions