在catch块内调试return语句 [英] Debugging return statement within catch block

问题描述

我正在开发一个Android应用程序，其中使用以下代码段：

  private Boolean myMethod（boolean isOnline）{
 try {
 if（isOnline）{
 ... 
 return true; 
} 
 else {
 ... 
 return true; 
} 
} 
 catch（SocketTimeoutException e）{
 this.e = e; 
返回false; 
} catch（IOException e）{
 this.e = e; 
返回false; 
} catch（XmlPullParserException e）{
 this.e = e; 
返回false; 
} catch（Exception e）{
 this.e = e; 
返回false; 
} 
} 
  

当我调试代码。在执行 this.e = e; 和 this.e 是 null 。如果我删除最后一个catch块

  catch（Exception e）{
 this.e = e; 
返回false; 
} 
  

然后执行以下catch块中的return语句

  catch（XmlPullParserException e）{
 this.e = e; 
返回false; 
} 
  

我犯了什么错误？

解决方案

您的错误是添加此块：

  catch（Exception e）{
 this.e = e; 
返回false; 
} 
  

它将捕获所有内容，导致您的XmlPullParserException不被称为IMO。 p>

I'm developing an android application where I use the following snippet:

private Boolean myMethod(boolean isOnline) {
    try {
        if (isOnline) {
            ...
            return true;    
        } 
        else {
            ...
            return true;
        }
    } 
    catch (SocketTimeoutException e) {
        this.e = e;
        return false;
    } catch (IOException e) {
        this.e = e;
        return false;
    } catch (XmlPullParserException e) {
        this.e = e;
        return false;
    } catch (Exception e) { 
        this.e = e;
        return false;
    }
}

while I'm debugging the code. The return statement in the last catch block return false; is executed without executing this.e = e; and this.e is null. If I remove the last catch block

catch (Exception e) { 
    this.e = e;
    return false;
}

then the return statement in the following catch block is executed

catch (XmlPullParserException e) {
    this.e = e;
    return false;
} 

What mistakes did I make?

解决方案

Your mistake is adding this block:

catch (Exception e) { 
    this.e = e;
    return false;
}

It will catch everything, leading to your XmlPullParserException not being called IMO.

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