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Commit 6553d7f

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新增"实现Runnable接口 VS. 继承Thread类 "
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‎README.md

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* [Java 源码里的设计模式](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/Examples_of_GoF_Design_Patterns_in_Java's_core_libraries.md)
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* [如何产生一个随机的字母数字串作为 session 的唯一标识符](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/How_to_generate_a_random_alpha-numeric_string.md)
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* [如何创建单例](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/What_is_an_efficient_way_to_implement_a_singleton_in_Java.md)
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* [实现Runnable接口 VS. 继承Thread类](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/implements-runnable-vs-extends-thread.md)
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> 网络
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- [How can I create an executable jar with dependencies using Maven?](http://stackoverflow.com/questions/574594/how-can-i-create-an-executable-jar-with-dependencies-using-maven)
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- [Why is executing Java code in comments with certain Unicode characters allowed?](http://stackoverflow.com/questions/30727515/why-is-executing-java-code-in-comments-with-certain-unicode-characters-allowed)
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- [Dealing with "java.lang.OutOfMemoryError: PermGen space" error](http://stackoverflow.com/questions/88235/dealing-with-java-lang-outofmemoryerror-permgen-space-error)
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- ["implements Runnable" vs. "extends Thread"](http://stackoverflow.com/questions/541487/implements-runnable-vs-extends-thread)
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- [Convert a String to an enum in Java](http://stackoverflow.com/questions/604424/convert-a-string-to-an-enum-in-java)
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- [Android SDK installation doesn't find JDK](http://stackoverflow.com/questions/4382178/android-sdk-installation-doesnt-find-jdk)
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- [Java inner class and static nested class](http://stackoverflow.com/questions/70324/java-inner-class-and-static-nested-class)
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- ['Must Override a Superclass Method' Errors after importing a project into Eclipse](http://stackoverflow.com/questions/1678122/must-override-a-superclass-method-errors-after-importing-a-project-into-eclips)
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##实现Runnable接口 VS. 继承Thread类 ?
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在Java中,并发执行任务一般有两种方式:
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(1)实现Runnable接口
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(2)继承Thread类
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一般而言,推荐使用方式(1),主要是由于大多数情况下,人们并不会特别去关注线程的行为,也不会去改写Thread已有的行为或方法,仅仅是期望执行任务而已。
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因此,使用接口的方式能避免引入一些并不需要的东西,同时也不会影响继承其他类,并使程序更加灵活。
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###额外的tips:
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(1)Runnable与Thread不是对等的概念
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在Thinking in Java中,作者吐槽过Runnable的命名,称其叫做Task更为合理。
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在Java中,Runnable只是一段用于描述任务的代码段而已,是静态的概念,需要通过线程来执行。而Thread更像是一个活体,自身就具有很多行为,能够用来执行任务。
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(2)仅仅当你确实想要重写(override)一些已有行为时,才使用继承,否则请使用接口。
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(3)在Java 5之前,创建了Thread却没调用其start()方法,可能导致内存泄露。
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stackoverflow链接:
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http://stackoverflow.com/questions/541487/implements-runnable-vs-extends-thread
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