Java程序中,以下关于标识符的说法不正确的是( )。
A.标识符是由字母、数字、下划线(_) 或美元符($)组成的字符串
B.下划线不能作为标识符的开头
C.标识符区分大小写
D.标识符长度没有限制。
正确答案是B
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