Assignment activities used for setup begin with a lowercase letter.
用于设置的分配活动则以小写字母开头。
Variable 'underscore and the name of variable starting with a lowercase letter.
底线和以小写字母开始的变数名称。
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 。
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