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	https://github.com/liusxg/java-patterns#单例模式
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http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html	http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html
	https://github.com/liusxg/java-patterns#第一种方法在静态方法getinstance加上synchronized同步锁
	https://github.com/liusxg/java-patterns#特点
	https://github.com/liusxg/java-patterns#第二种方法双重锁保证简称dcl
	https://github.com/liusxg/java-patterns#特点-1
	https://github.com/liusxg/java-patterns#修复dclvolatile关键字
	https://github.com/liusxg/java-patterns#单例模式另外两种实现
使用ThreadLocal	https://github.com/liusxg/java-patterns/blob/master/src/main/java/com/liusxg/patterns/singleton/Singleton5.java
	https://github.com/liusxg/java-patterns#使用threadlocal
通过内部类加载实现，最优雅的方式	https://github.com/liusxg/java-patterns/blob/master/src/main/java/com/liusxg/patterns/singleton/Singleton6.java
	https://github.com/liusxg/java-patterns#通过内部类加载实现最优雅的方式
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