The parent keyword is particularly important in constructor methods.

parent 关键字在构造函数方法中尤其重要。

youdao

The constructor methods for both versions are virtually identical, except for the format of values being stored, as shown in Listing 3.

两个版本的构造方法实际上都是相类似的，除了存储值的格式之外，如清单3所示。

youdao

A class can have different constructor methods, differentiated by the different attributes enclosed within the parentheses following the class name.

类可以有不同的构造函数方法，这些方法是通过类名称后的圆括号内附带的不同属性进行区分。

youdao