Four to seven lowercase and alphanumeric characters, beginning with a letter.

四到七个小写字母和字母数字字符，以字母开头。

youdao

Method, field, and local variable names begin with a lowercase letter, as in read .

方法、字段和本地变量名以小写字母开头，如read 。

youdao

Method, field, and local variable names begin with a lowercase letter, as in read .

方法、字段和本地变量名以小写字母开头，如read 。

youdao