以下异常处理程序语句之间有什么区别? [英] What is the difference among the following exception handler statements?

问题描述

嗨.
我是Java新手，我想知道使用和

Hi .
I am new in java, i am wondering about the difference between using and

throw and throws and try catch and finally

当我使用所有这些异常处理程序以及运行时异常和已检查的异常时

when i use all of these exception handlers and what are the run time exceptions and checked exceptions

推荐答案

请参阅 ^ ]很好地介绍了异常处理.

See here[^] for a good introduction on exception handling.

有两种处理异常的方法:

您可以抛出异常:

There are 2 ways to deal with exceptions:

you can throw an exception:

public int foo() throws Exception{
  // fancy code that needs Exception handling 
  // like reading a file or parsing a int value
}

在这里，您传回异常，而不是所需的int值.上面的方法必须处理异常，并可能将其传递或处理.

其他版本是直接捕获异常:

here you pass back the exception instead of the desired int-value. the method above has to deal with the exception and probably to pass it on or to deal with it.

Other version is to catch the exception direct:

public int foo() throws Exception{
  try{
    // fancy code that needs Exception handling 
    // like reading a file or parsing a int value
  }
  catch(Exception oException){
    oException.printStackTrace();
    return -1;
  }
}

在这种情况下，您会捕获异常并经常返回无效的int值，如-1.您可以在catch后面添加finally { }以确保无论try/catch是否失败(例如，关闭文件流，确保数据库不会失效)都可以执行某些操作.

in this case you catch the exception and often return a invalid int-value like -1. You can add a finally { } behind the catch to make sure certain operations are carried out no matter if the try/catch fails or not (e.g. closing file streams, making sure the database does not become invalid).

您要查询的信息可能会很容易在网络上找到自己: [

You are asking for info you may easily find yourself on the web: Google results for "Java exception handling tutorial"[^]

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