面向对象的电话本，具有查询删除插入等功能，使用多个函数，条理清晰。既包含了业务流程的逻辑，又包含了电话本缓存的逻辑 -Object-oriented phone book, delete the insert with the query and other functions, the use of multiple functions, the clarity. It contains both the business process logic, but also contains