在Java(或任何其他带有受控异常的语言)中,当创建您自己的异常类时,您如何决定它应该被检查还是未检查?

我的直觉是,在调用者可能能够以某种有效的方式恢复的情况下,将调用checked异常,而作为未检查的异常则更多地用于不可恢复的情况,但我对其他人的想法感兴趣。


当前回答

你是正确的。

未经检查的异常用于让系统快速失效,这是一件好事。为了正常工作,你应该清楚地说明你的方法期望什么。通过这种方式,您可以只验证输入一次。

例如:

/**
 * @params operation - The operation to execute.
 * @throws IllegalArgumentException if the operation is "exit"
 */
 public final void execute( String operation ) {
     if( "exit".equals(operation)){
          throw new IllegalArgumentException("I told you not to...");
     }
     this.operation = operation; 
     .....  
 }
 private void secretCode(){
      // we perform the operation.
      // at this point the opreation was validated already.
      // so we don't worry that operation is "exit"
      .....  
 }

举个例子。关键是,如果系统快速失效,那么你就会知道它在哪里以及为什么会失效。你会得到这样的堆栈跟踪:

 IllegalArgumentException: I told you not to use "exit" 
 at some.package.AClass.execute(Aclass.java:5)
 at otherPackage.Otherlass.delegateTheWork(OtherClass.java:4569)
 ar ......

你会知道发生了什么。“delegateTheWork”方法中的OtherClass(在第4569行)使用“exit”值调用你的类,即使它不应该这样做等等。

否则你将不得不在你的代码中散布验证,这很容易出错。另外,有时很难跟踪哪里出了问题,可能会有几个小时令人沮丧的调试

同样的事情也发生在nullpointerexception中。如果你有一个700行的类,有15个方法,使用30个属性,它们都不能为空,而不是在每个方法中验证可为空性,你可以使所有这些属性都是只读的,并在构造函数或工厂方法中验证它们。

 public static MyClass createInstane( Object data1, Object data2 /* etc */ ){ 
      if( data1 == null ){ throw NullPointerException( "data1 cannot be null"); }

  }


  // the rest of the methods don't validate data1 anymore.
  public void method1(){ // don't worry, nothing is null 
      ....
  }
  public void method2(){ // don't worry, nothing is null 
      ....
  }
  public void method3(){ // don't worry, nothing is null 
      ....
  }

当程序员(你或你的同事)做的每件事都是正确的,验证输入,运行测试,所有的代码都是完美的,但代码连接到第三方web服务可能会关闭(或你正在使用的文件被另一个外部进程删除等)时,检查异常是有用的。web服务甚至可以在连接尝试之前进行验证,但是在数据传输过程中出错了。

在这种情况下,你或你的同事都无能为力。但你还是得做点什么,不能让应用程序在用户眼中消失。你使用一个检查异常来处理异常,当发生这种情况时你能做什么?,大多数时候,只是尝试记录错误,可能会保存你的工作(应用程序工作),并向用户显示消息。(网站blabla宕机,请稍后重试)

如果检查过的异常被过度使用(通过在所有方法签名中添加“throw exception”),那么您的代码将变得非常脆弱,因为每个人都会忽略这个异常(因为太普遍),代码质量将严重受损。

如果过度使用未检查异常,也会发生类似的情况。这段代码的用户不知道是否会出现错误,因此进行了大量的尝试{…}catch(Throwable t)将出现。

其他回答

以下是我的“最终经验法则”。 我使用:

方法代码中由于调用者导致的失败而出现的未检查的异常(这涉及一个显式和完整的文档) 检查异常失败由于被调用,我需要明确的任何人想要使用我的代码

与前面的答案相比,这是使用一种或另一种(或两种)例外的明确理由(人们可以同意或不同意)。


对于这两个异常,我将为我的应用程序创建自己的未检查和已检查的异常(这里提到过,这是一个很好的实践),除了非常常见的未检查异常(如NullPointerException)

例如,下面这个特定函数的目标是创建(如果已经存在,则获取)一个对象, 意义:

the container of the object to make/get MUST exist (responsibility of the CALLER => unchecked exception, AND clear javadoc comment for this called function) the other parameters can not be null (choice of the coder to put that on the CALLER: the coder will not check for null parameter but the coder DOES DOCUMENT IT) the result CAN NOT BE NULL (responsibility and choice of the code of the callee, choice which will be of great interest for the caller => checked exception because every callers MUST take a decision if the object can not be created/found, and that decision must be enforced at the compilation time: they can not use this function without having to deal with this possibility, meaning with this checked exception).

例子:


/**
 * Build a folder. <br />
 * Folder located under a Parent Folder (either RootFolder or an existing Folder)
 * @param aFolderName name of folder
 * @param aPVob project vob containing folder (MUST NOT BE NULL)
 * @param aParent parent folder containing folder 
 *        (MUST NOT BE NULL, MUST BE IN THE SAME PVOB than aPvob)
 * @param aComment comment for folder (MUST NOT BE NULL)
 * @return a new folder or an existing one
 * @throws CCException if any problems occurs during folder creation
 * @throws AssertionFailedException if aParent is not in the same PVob
 * @throws NullPointerException if aPVob or aParent or aComment is null
 */
static public Folder makeOrGetFolder(final String aFoldername, final Folder aParent,
    final IPVob aPVob, final Comment aComment) throws CCException {
    Folder aFolderRes = null;
    if (aPVob.equals(aParent.getPVob() == false) { 
       // UNCHECKED EXCEPTION because the caller failed to live up
       // to the documented entry criteria for this function
       Assert.isLegal(false, "parent Folder must be in the same PVob than " + aPVob); }

    final String ctcmd = "mkfolder " + aComment.getCommentOption() + 
        " -in " + getPNameFromRepoObject(aParent) + " " + aPVob.getFullName(aFolderName);

    final Status st = getCleartool().executeCmd(ctcmd);

    if (st.status || StringUtils.strictContains(st.message,"already exists.")) {
        aFolderRes = Folder.getFolder(aFolderName, aPVob);
    }
    else {
        // CHECKED EXCEPTION because the callee failed to respect his contract
        throw new CCException.Error("Unable to make/get folder '" + aFolderName + "'");
    }
    return aFolderRes;
}

来自Java学习者:

When an exception occurs, you have to either catch and handle the exception, or tell compiler that you can't handle it by declaring that your method throws that exception, then the code that uses your method will have to handle that exception (even it also may choose to declare that it throws the exception if it can't handle it). Compiler will check that we have done one of the two things (catch, or declare). So these are called Checked exceptions. But Errors, and Runtime Exceptions are not checked for by compiler (even though you can choose to catch, or declare, it is not required). So, these two are called Unchecked exceptions. Errors are used to represent those conditions which occur outside the application, such as crash of the system. Runtime exceptions are usually occur by fault in the application logic. You can't do anything in these situations. When runtime exception occur, you have to re-write your program code. So, these are not checked by compiler. These runtime exceptions will uncover in development, and testing period. Then we have to refactor our code to remove these errors.

以下是我在多年开发经验后的一些看法:

Checked exception. This is a part of business use case or call flow, this is a part of application logic we expect or not expect. For example connection rejected, condition is not satisfied etc. We need to handle it and show corresponding message to user with instructions what happened and what to do next (try again later etc). I usually call it post-processing exception or "user" exception. Unchecked exception. This is a part of programming exception, some mistake in software code programming (bug, defect) and reflects a way how programmers must use API as per documentation. If an external lib/framework doc says it expects to get data in some range and non null, because NPE or IllegalArgumentException will be thrown, programmer should expect it and use API correctly as per documentation. Otherwise the exception will be thrown. I usually call it pre-processing exception or "validation" exception.

目标受众。现在让我们来谈谈目标受众或设计例外的人群(根据我的观点):

检查异常。目标受众是用户/客户。 未经检查的异常。目标受众是开发人员。换句话说,未检查异常仅是为开发人员设计的。

通过应用程序开发生命周期阶段。

受控异常被设计为在整个生产生命周期中存在,作为应用程序处理异常情况的正常和预期机制。 未检查异常被设计为只存在于应用程序开发/测试生命周期期间,所有这些异常都应该在这段时间内得到修复,并且当应用程序已经在生产环境中运行时不应该抛出。

框架通常使用未检查异常(例如Spring)的原因是框架不能确定应用程序的业务逻辑,这取决于开发人员捕捉并设计自己的逻辑。

检查例外: 如果客户端可以从异常中恢复,并希望继续,请使用受控异常。

未经检查的异常: 如果客户端在异常发生后不能做任何事情,则引发未检查的异常。

示例:如果您希望在方法a()中执行算术操作,并且基于a()的输出,则必须执行另一个操作。如果方法A()的输出为空,而您在运行时并不期望它,那么您将抛出空指针异常,即运行时异常。

请参考这里

在任何一个足够大的系统上,有很多层,检查异常是无用的,因为无论如何,您需要一个架构级策略来处理异常将如何处理(使用故障屏障)。

使用受控异常,您的错误处理策略是微管理的,在任何大型系统上都无法承受。

大多数情况下,您不知道错误是否“可恢复”,因为您不知道API的调用者位于哪一层。

假设我创建了一个StringToInt API,用于将整数的字符串表示形式转换为Int。如果API是用“foo”字符串调用的,我必须抛出检查异常吗?它可以恢复吗?我不知道,因为在他的层中,我的StringToInt API的调用者可能已经验证了输入,如果抛出这个异常,它要么是一个错误,要么是一个数据损坏,它是不可恢复的这一层。

在这种情况下,API的调用者不想捕获异常。他只想让异常“冒出来”。如果我选择了一个受控异常,这个调用者将有大量无用的catch块,只能人为地重新抛出异常。

大多数时候,什么是可恢复的取决于API的调用者,而不是API的编写者。API不应该使用受控异常,因为只有未受控异常才允许选择捕获或忽略异常。