Java中的异常翻译与异常链接 | Java中的异常翻译与异常链接

本文介绍了Java中的异常翻译与异常链接的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

异常翻译和异常链接在Java中有什么区别？

What is the difference between Exception Translation and Exception Chaining in Java?

推荐答案

根据有效Java 中的 Joshua Bloch -

异常翻译

较高的层应捕获较低级别的异常
，并代之以可以用$ b解释的异常$ b较高级别的抽象。

Exception Translation
Higher layers should catch lower-level exceptionsand, in their place, throw exceptions that can be explained in terms of thehigher-level abstraction.

try {
    // Use lower-level abstraction to do our bidding
    ...
} catch(LowerLevelException e) {
    throw new HigherLevelException(...);
}

异常链接

它是异常翻译的一种特殊形式。
如果较低级别的异常可能有助于调试
的人，则该问题会导致较高级别的异常。较低级别的异常（原因）被传递给较高级别的异常，该异常提供了
访问器方法（Throwable.getCause）来检索较低级别的异常：

Exception Chaining
It is special form of exception translation.In cases where the lower-level exception might be helpful to someone debuggingthe problem that caused the higher-level exception. The lower-level exception (the cause) is passed to the higher-level exception, which provides anaccessor method (Throwable.getCause) to retrieve the lower-level exception:

try {
    ... // Use lower-level abstraction to do our bidding
} catch (LowerLevelException cause) {
    throw new HigherLevelException(cause);
}

高级异常的构造方法将原因传递给可链接的
超类构造函数，因此最终将其传递给Throwable的chainingaware构造函数之一，例如Throwable（Throwable）：

The higher-level exception’s constructor passes the cause to a chaining-awaresuperclass constructor, so it is ultimately passed to one of Throwable’s chainingaware constructors, such as Throwable(Throwable):

// Exception with chaining-aware constructor
class HigherLevelException extends Exception {
    HigherLevelException(Throwable cause) {
        super(cause);
    }
}

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