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https://patch-diff.githubusercontent.com/liusxg/java-patterns#单例模式
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http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.htmlhttp://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html
https://patch-diff.githubusercontent.com/liusxg/java-patterns#第一种方法在静态方法getinstance加上synchronized同步锁
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