Java核心API反模式。哪里不对？ [英] Java core API anti-Patterns. What is wrong?

问题描述

我几本书读过关于Java核心库，失误了一些批评（据我所知）仍然存在的向后兼容性和传统的原因。我想有一个COM prehensive列表，这样的问题是，你知道哪些？

I have read in several books some criticism about mistakes in Java core library that (as far as I know) are still there for backward compatibility and legacy reasons. I would like to have a comprehensive list, so the question is, which ones do you know?

例如：

• 观测是一类;应的接口，以便允许多个继承。


• Cloneable的是一个标记接口，和对象是克隆的所有者（） 方法;相反，的clone（）应该在 Cloneable的接口

• Observable is a class; should be an interface in order to allow multiple inheritance.
• Cloneable is a marker interface, and Object is the owner of clone() method; instead, clone() should be in the Cloneable interface

推荐答案

• 属性扩展哈希表。 AARGH。


• 中的每个对象是可锁定的，而不是具体的锁定对象（.NET有同样的问题）


• 每个有对象相等/哈希code - 再.NET有同样的问题，但至少他们有的IEqualityComparer＆LT; T＆GT; 以及的IComparer＆LT; T＆GT; 。这是所有地图等应该走的路，因为有根据环境平等多个概念。


• 日期/时间API（新版本在Java 7中，我希望）


• NIO的异步模式是难度比异步.NET模型神交


• 没有统一的处理界面 - 部分原因是由于检查的异常 - 这使得使用的声明难以应付（即<一的等效href=\"http://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html\">try-with-resources在Java 7中陈述是使用相当于，宽）


• 可怜的文本编码支持（太多使用的名称作为字符串）


• 无无符号字节型

• Properties extends Hashtable. Aargh.
• Every object being available for locking instead of specific lock objects(.NET has the same problem)
• Every object having equality/hashcode - again .NET has the same problem, but at least they have IEqualityComparer<T> as well as IComparer<T>. This is the way that all maps etc should go, as there are multiple concepts of equality depending on circumstance.
• The date/time API (new version in Java 7, I hope)
• The async model of NIO is harder to grok than the async .NET model
• No universal disposal interface - partly due to checked exceptions - which makes an equivalent of the "using" statement harder to cope with (the try-with-resources statement in Java 7 is the equivalent of using, broadly)
• Poor text encoding support (too much use of names as strings)
• No unsigned byte type

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