java “Catch 分支是相同的”但是仍然需要我抓住它
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'Catch branch is identical' however still requires me to catch it
提问by Juxhin
Whilst reading through my code I noticed my IDE was listing a warning with the following message:
在阅读我的代码时，我注意到我的 IDE 列出了带有以下消息的警告：
Reports identical catch sections in try blocks under JDK 7. A quickfix is available to collapse the sections into a multi-catch section.
在 JDK 7 下的 try 块中报告相同的 catch 部分。可以使用快速修复将这些部分折叠成一个多捕获部分。
And also specifies that this warning is thrown for JDK 7+
并且还指定为 JDK 7+ 抛出此警告
The try block is as follows:
try 块如下：
try {
FileInputStream e = new FileInputStream("outings.ser");
ObjectInputStream inputStream = new ObjectInputStream(e);
return (ArrayList)inputStream.readObject();
} catch (FileNotFoundException var3) {
var3.printStackTrace();
} catch (ClassNotFoundException var5) {
var5.printStackTrace();
} catch (IOException ex){
ex.printStackTrace();
}
However when removing (the catch blocks that threw that particular warning):
但是，当删除（抛出该特定警告的 catch 块）时：
catch (ClassNotFoundException var5) {
var5.printStackTrace();
} catch (IOException ex){
ex.printStackTrace();
}
I would still get errors at:
我仍然会在以下位置遇到错误：
ObjectInputStream inputStream = new ObjectInputStream(e);
return (ArrayList)inputStream.readObject();
Am I missing something obvious that I haven't figured out so far?
我是否遗漏了一些到目前为止我还没有弄清楚的明显内容？
回答by Makoto
So, since I'm seeing that same warning in IntelliJ (and I think you're using IntelliJ too), why not let Alt+Enter(or Option+Returnif you rather) show you what it means?
所以，既然我在 IntelliJ 中看到了同样的警告（我认为你也在使用 IntelliJ），为什么不让Alt+ Enter（或者Option+，Return如果你愿意的话）向你展示它的含义？
You can collapse exception branches if they're identical, and with the multi-catch syntax, you'll wind up with one catch statement that does the same thing as your three:
如果它们相同，您可以折叠异常分支，并且使用 multi-catch 语法，您将得到一个 catch 语句，它与您的三个语句执行相同的操作：
try {
FileInputStream e = new FileInputStream("outings.ser");
ObjectInputStream inputStream = new ObjectInputStream(e);
return (ArrayList)inputStream.readObject();
} catch (ClassNotFoundException | IOException var3) {
var3.printStackTrace();
}
return null;
