By setting these values, you set default values for each property.

通过设置这些值，可以设置每个属性的默认值。

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Optionally, you can set default values if they are not given by the schema validation, as shown in Listing 15.

如果模式检验没有提供默认值，还可以设置默认值，见清单15。

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Constructors enable the programmer to set default values, limit instantiation, and write code that is flexible and easy to read.

构造函数使得程序员可以设置默认值，限制实例化，代码是灵活的和容易写。

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