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https://github.com/shunui/java-bible/blob/master/designpatterns/singleton.md#read-more
Double Checked Locking on Singleton Class in Javahttp://javarevisited.blogspot.sg/2014/05/double-checked-locking-on-singleton-in-java.html
http://javarevisited.blogspot.sg/2012/07/why-enum-singleton-are-better-in-java.htmlhttp://javarevisited.blogspot.sg/2012/07/why-enum-singleton-are-better-in-java.html
How to create thread safe Singleton in Javahttp://javarevisited.blogspot.com/2012/12/how-to-create-thread-safe-singleton-in-java-example.html
10 Singleton Pattern Interview questions in Javahttp://javarevisited.blogspot.com/2011/03/10-interview-questions-on-singleton.html
原文出处http://wuchong.me/blog/2014/08/28/how-to-correctly-write-singleton-pattern/#from=biezhi.me
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