更简洁的方法是使用 Integer computeSpeed(Integer time, Integer distance); 方法创建接口:

A cleaner way would be to create an interface with a Integer computeSpeed(Integer time, Integer distance); method:

public interface DistanceCalculator {
    Integer computeSpeed(Integer distance, Integer time);
}

然后您要求学生实现它并调用他们的实现 StudentNameDistanceCalculator.例如，您将收到学生的以下课程:

You then ask the students to implement it and call their implementation StudentNameDistanceCalculator. For example you will receive the following classes from your students:

public class AssyliasDistanceCalculator implements DistanceCalculator {
    public Integer computeSpeed(Integer distance, Integer time) {  
        return distance / time;
    }
}

public class BobDistanceCalculator implements DistanceCalculator {
    public Integer computeSpeed(Integer distance, Integer time) {
        return distance / time * 2;
    }
}

然后您可以在一个项目中加载他们的所有类并一次测试所有类.以 TestNg 为例:

You can then load all their classes in one project and test all the classes at once. For example with TestNg:

@Test(dataProvider = "students")
public void testMethod(Class<?> clazz) throws Exception {
    DistanceCalculator dc = (DistanceCalculator) clazz.newInstance();
    assertEquals(dc.computeSpeed(3, 1), (Integer) 3, 
            clazz.getSimpleName().replace("DistanceCalculator", "") + " failed");
}

@DataProvider(name = "students")
public Object[][] dataProvider() {
    return new Object[][]{
        {AssyliasDistanceCalculator.class},
        {BobDistanceCalculator.class}};
}

你会得到一份关于谁没有通过测试的详细报告:

And you will get a detailed report of who doesn't pass the test: