弄清楚可以抛出的所有可能的异常？(Figure out all possible exceptions that can be thrown?)

 是否有可能找出可能抛出的所有可能的异常，这些异常不一定由方法的签名列出。 
 
 有2例 
 
 1）不必声明的运行时异常（显然有些是显而易见的，例如空指针，但是还有其他运行时异常我想要捕获，这可能是由于数据不好，在开发过程中我不喜欢还不知道数据不好。 
 
 2）异常是签名中列出的异常的子类。 
 
 动机的例子 
 
 想象一下我在HttpURLConnection对象上调用getInputStream（），它会抛出java.io.Exception，但实际上，它会抛出其他异常，这些异常是java.io.Exception（ala java.io.FileNotFoundException）的sublcasses，我想要的以独特的方式处理（即不想将所有java.io.Exceptions混为一谈）。 
 
 所以虽然我可以通过捕获java.io.Exception并打印出实际的异常，然后修改代码来处理这种情况，在实践中学习，但是想知道是否有更好的方法:) 
 
 谢谢 
 
 编辑：我认为人们错过了我的第二个问题。 抛出与方法签名完全一致的已检查异常的方法，但由于方法的签名仅具有某种基类，因此未在其中列出。 

Is it possible to figure out all possible exceptions that can be thrown that are not necessarily listed by the method's signature.
 
There are 2 cases
 
1) runtime exceptions that don't have to be declared (obviously some are obvious, such as null pointer, but there are other runtime exceptions that I'd want to catch that can be due to bad data, which while in development I don't know is bad data yet).
 
2) exceptions that are subclasses of the exception listed in the signature.
 
a motivation example
 
imagine I call getInputStream() on an HttpURLConnection object, it throws java.io.Exception, but in reality, it throws other exceptions that are sublcasses of java.io.Exception (ala java.io.FileNotFoundException), which I'd want to handle in a unique manner (i.e. don't want to lump all java.io.Exceptions together).
 
so while I can learn in practice by catching java.io.Exception and printing out the actual exception, and then modifying code to handle that case, was wondering if there was a better method :)
 
thanks
 
edit: I think people are missing my 2nd problem. Methods that throw checked exceptions that are fully consistent with the method's signature, but aren't listed in it due to the method's signature only having some sort of base class.

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