blocks|key|3251177|text|关于垃圾收集的维基百科条目涵盖了您的所有问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3251178|http://en.wikipedia.org/wiki/Garbage_collection_(computer_science)|offset|length|3251179|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1U|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

The Wikipedia entry for garbage collection covers all your questions:

<a href="http://en.wikipedia.org/wiki/Garbage_collection_(computer_science)" rel="nofollow">http://en.wikipedia.org/wiki/Garbage_collection_(computer_science)</a>

blocks|key|3251190|text|Sun%5EH%5EH%5EHOracle提供了有关该主题的extensive文档。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3251191|entityMap|0|LINK|mutability|MUTABLE|url|http://www.oracle.com/technetwork/java/javase/tech/index-jsp-140228.html^0|O|9|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Sun^H^H^HOracle has <a href="http://www.oracle.com/technetwork/java/javase/tech/index-jsp-140228.html" rel="nofollow">extensive</a> documentation on the subject.

blocks|key|412284|text|非常简短的答案是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|412285|412286|+java垃圾收集到底是怎么回事？|blockquote|412287|412288|412289|GC是一种内存管理机制，其中系统(在本例中为JVM+)负责自动回收不再使用的内存。|412290|412291|它是如何实现的？|412292|412293|412294|有多种方法可以实现它。一个简单的描述是，跟踪分配的每一块内存。系统周期性地检查分配的部分，看看程序的任何部分(变量)是否仍然可以到达内存。任何无法访问的内存都会被回收。|412295|412296|何时以及如何调用它？|412297|412298|412299|这也是留给实现的。在Java语言中，惟一的保证是在抛出OutOfMemoryError之前，系统将尝试回收内存。我希望大多数GC实现在向底层操作系统请求更多内存之前，也会尝试进行收集。通常，会有一个后台线程来处理收集器的运行。|412300|412301|为了回收内存，遵循什么算法?？|412302|412303|412304|有几种可能的方法。看看其他人发表的文章，作为这方面的起点。|412305|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|18|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1B|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|K|3|L|5|E|7|1D|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1G|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|R|3|S|5|E|7|1I|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|1L|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|E|7|1N|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]|$1|11|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|14|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]]|15|$]]

The very short version of answers are:

<blockquote>
 What is java garbage collection all
 about?
</blockquote>

GC is a mechanism of memory management where the system (the JVM in this case) is responsible for automatically reclaiming memory that is no longer in use. 

<blockquote>
 How is it implemented?
</blockquote>

There are various ways to implement it. A simple description is that each piece of memory that is allocated is tracked. periodically the system checks the allocated pieces to see if any part of the program (the variables) can still reach the memory. Any memory that cannot be reached is reclaimed.

<blockquote>
 When and how is it called ?
</blockquote>

This is also left up to the implementation. The only guarantee you have in Java is that before an OutOfMemoryError is thrown the system will attempt to reclaim memory. I would expect that most GC implementations also try to do a collection before they ask the underlying operating system for more memory. In general there will be a background thread that deals with running the collector.

<blockquote>
 What algorithms if follows in order to
 reclaim memory ??
</blockquote>

There are several possible ones. Look at the articles others have posted as a starting point for that.

blocks|key|412310|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|412311|+...简而言之，关于它的一切:)|blockquote|412312|412313|412314|如果你有一个好的图书馆，看看这本关于垃圾收集的优秀而全面的书：|412315|Richard+Jones和Rafael+Lins，垃圾收集:自动动态内存管理的算法，Wiley+and+Sons+(1996年)，ISBN+0-471-94148-4|412316|此外，这本书还在印刷中，并在至少一家知名的在线书店上市。多买点东西。它是新的，价格范围很广，低至25美元的二手。|412317|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|N|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|O|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|P|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|Q|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|R|7|@]|8|@]|9|$]]|$1|H|3|I|4|5|6|S|7|@]|8|@]|9|$]]|$1|J|3|K|4|5|6|T|7|@]|8|@]|9|$]]|$1|L|3|-4|4|5|6|U|7|@]|8|@]|9|$]]]|M|$]]

<blockquote>
 ... In short everything about it :) 
</blockquote>

If you have access to a good library, checkout this excellent and comprehensive book on garbage collection:

Richard Jones and Rafael Lins, Garbage Collection: Algorithms for Automatic Dynamic Memory Management, Wiley and Sons (1996), ISBN 0-471-94148-4

Furthermore, this book it is still in print, and listed on at least one well known online bookstore. Shop around. It is available new for a wide range of prices, and for as low as $25 US second hand.

blocks|key|3251233|text|更好的关于GC在Java中的工作原理的文章，请访问JavaRevisted和wiki，丹提到过|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3251234|entityMap|0|LINK|mutability|MUTABLE|url|http://javarevisited.blogspot.in/2011/04/garbage-collection-in-java.html|1|http://en.wikipedia.org/wiki/Garbage_collection_%2528computer_science%2529^0|P|C|0|12|4|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

Better article for how GC works in Java at <a href="http://javarevisited.blogspot.in/2011/04/garbage-collection-in-java.html" rel="nofollow" title="JavaRevisited">JavaRevisted</a>
And Algorithem you can get at <a href="http://en.wikipedia.org/wiki/Garbage_collection_%28computer_science%29" rel="nofollow" title="wiki">wiki</a> as mentioned by Dan

blocks|key|412333|text|垃圾收集技术使用标记和扫描算法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|412334|有关更多详细信息，请访问Mark-and-Sweep+Garbage+Collection|offset|length|412335|entityMap|0|LINK|mutability|MUTABLE|url|http://www.brpreiss.com/books/opus5/html/page424.html^0|0|C|X|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

The garbage collection technique uses MARK and SWEEP algorithm.

For more details <a href="http://www.brpreiss.com/books/opus5/html/page424.html" rel="nofollow">Mark-and-Sweep Garbage Collection</a>

I read at many places, but did not find a place where I can learn about :

What is java garbage collection all about? 

How is it implemented? 

When and how is it called ? 

What algorithms if follows in order to reclaim memory ?? 

In short everything about it :) 

FIXED!!!

A very good article : <a href="http://www.artima.com/insidejvm/ed2/gcP.html" rel="noreferrer">http://www.artima.com/insidejvm/ed2/gcP.html</a>

Theory and algorithm behind Java garbage collection

我在很多地方读过，但没有找到一个我可以了解的地方：java垃圾收集到底是怎么回事？它是如何实现的？它是什么时候以及如何调用的？为了回收内存，需要遵循哪些算法？简而言之，关于它的一切:)已修复！一篇非常好的文章：

问Java垃圾收集背后的理论和算法
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