此程序可用来学习异常处理机制，用例题演示了怎样利用try-catch-finally语句捕获和处理异常-This procedure can be used to study exception handling mechanism, with the example demonstrates how to use try-catch-finally statement to catch and handle exceptions

try-catch 用法详解, 包括相关介绍及使用注意事项-how to use try-catch