不同风格的程序流程？ [英] Different styles of flow of program?

问题描述

我是一个计算机科学学生，因此我不知道。

我最近跟一个刚刚得到一个（java）软件开发人员的朋友聊天。他告诉我，在他的工作中有一个真正有C ++经验的人，但不幸的是每次他在java中编写代码时，他都使用try-catch来控制程序的流程。根据我的朋友，这是一个错误的风格在Java。这是真的？在C ++和Java之间使用try-catch（-finally在java中）有什么区别（如果有的话）？

解决方案

使用try-catch控制程序的流程在任何地方都是错误的...异常处理是它说的是：

情况的处理。

当然，每个规则都有十几个必要偏差的反例，

当您预期在正常操作环境中抛出某些异常，并且您做出逻辑决策时，会使用异常来控制程序的流程

例如以伪代码控制程序流程：

  try {
写入更新到文件
} catch（IOException）{
写入更新到备用文件
} 
  pre> 
 
 
在这种情况下，最好在盲目执行写入之前实际测试路径的存在。
 
 
 
  
 
 
 
异常处理的一个很好的用法：（伪代码）
  try {
 do stuff 
} catch（OutOfMemoryException）{
正常失败别的，以实现相同的结果）
} 
  
 
I am a computer science student therefore I do not know that much. 

I was recently talking with a friend who just got a job as a (java) software developer. He told me that in his job there is a guy who is really experienced in C++, but unfortunately every time he writes code in java, he is using the try-catch to control the flow of the program. According to my friend this is a wrong style in Java. Is this true? What are the differences (if any) in using try-catch(-finally in java) between C++ and Java? 
解决方案
Using try-catch to control the flow of the program is wrong anywhere... Exception handling is what it says it is:  Handling of exceptional circumstances.

Of course for every rule there are a dozen counter-examples of necessary deviations, but generally speaking: Don't control program flow with exceptions.

Using exceptions for controlling the flow of a program occurs when you anticipate certain exceptions being thrown in a normal operating environment, and you make logical decisions based on those exceptions.

For example controlling program flow in pseudo code:
try {
  write update to file
} catch (IOException) {
  write update to alternate file
}
In this case it would be better to actually test for path existence before blindly performing the write.

I removed the permission checking notes because it's a bad example

A good usage of exception handling: (pseudo code again)
try {
  do stuff
} catch(OutOfMemoryException) {
  fail gracefully (don't try and do something else to achieve the same result)
}


                        
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