StackOverflow2013

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2013-02-24T07:31:45.933
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2013-02-24T07:39:17.430
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Checked exceptions in Java can cause an scalability problem when programmers fail to throw exceptions suitable to the method. (See Effective Java, Item 43: Throw exceptions appropriate to the abstraction). Lazy programmers tend to append exceptions to the <code>throws</code> clause of their method without considering whether they are appropriate. As a result, methods gather increasing numbers of exceptions as you look higher and higher in the application architecture. Top-level methods can throw ten or more exceptions if one is not careful. For instance, in a method designed to encrypt data, many low-level exceptions could be thrown (e.g. <code>IOException</code>, <code>NoSuchAlgorithmException</code>, <code>KeyNotFoundException</code>...). It is not necessary to expose these to an API user. Instead, an <code>EncryptionFailed</code> exception could be thrown, with the gory details stored in the <code>cause</code> field of the exception. <hr> I presume "dynamic exception checking" might refer to catching <code>Throwable</code> or <code>Exception</code> (one of the root classes) and dynamically deciding whether to handle the exception, based on some external stimulus. For example: <pre><code>List<Class<?>> exceptionTypes = new ArrayList<>(); exceptionTypes.add(IllegalArgumentException.class); exceptionTypes.add(IOException.class); try { // do something } catch (Exception e) { if (exceptionTypes.contains(e.getClass())) { e.printStackTrace(); } } </code></pre> Note: the above example is just an illustration. But imagine an IDE that executes code on behalf of the user and allows them to select exception classes they wish to catch.
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1. POWhat is static exception checking and dynamic exception checking?
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1. USDuncan Jones
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1. USDuncan Jones
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