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一、标识符 JAVA中的变量名、方法名、类名和对象名都是标识符，程序在编写程序的过程中要标识和引用都需要标识符來唯一确定。在Java中标识符的命名规则如下：可由任意顺序的大小写字母、数字、下划线和美元符号组成。不能以数字开头。不能是Java中的保留关键字。没有长度限制，但是大小写敏感，如He...

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