Many factors are important, for example class, gender, age and ethnicity.
许多因素都很重要，如阶级、性别、年龄及民族。
选择我们的样例类。
Listing 1 is an example class named Employee.
清单1是一个称为Employee的示例类。
EXAMPLE Class of airline ticket and category of hotel in a hotel guide.
飞机的舱级和宾馆的等级分类。
EXAMPLE Class of airline ticket and category of hotel in a hotel guide.
飞机的舱级和宾馆的等级分类。
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