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Java标识符定义（标识符：凡是直接可以命名的地方）1、包名、类名、方法名、参数名、变量名等，这些符号被称为标识符。2、标识符可以由字母、数字、下划线（_）和美元符号（$）组成3、标识符不能以数字开头，不能是java中的关键字。例如：正确的标识符Use...

Java语言中，关键字volatile和synchronized有什么不同？

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