java - 当类具有多个不同的字段时，如何对其进行泛化？

Question

给定:

class PhysicsClass {
    private PhysicsInstructor instructor;
    private Set<PhysicsStudent> students;
}

class ChemistryClass {
    private ChemistryInstructor instructor;
    private Set<ChemistryStudent> students;
}

class MathemeticsClass {
    private MathemeticsInstructor instructor;
    private Set<MathemeticsStudent> students;
}

是否可以将所有这些类收集到一个通用类中，例如:

class ScienceClass<T> {
    // What to write here?
    // What to write here?
}

如果这不可能，那么我怎样才能防止这里的代码重复？

我想把它变成这样:

class ScienceClass<T extends Instructor, S extends Student> {
    private T instructor;
    private Set<S> students;
}

但这会让我做出类似的东西:

ScienceClass<PhysicsInstructor, ChemistryStudent> scienceClass;

这是不正确的。

Answer 1

从主题的界面开始

public interface Subject {}

public interface Physics extends Subject {}
public interface Chemistry extends Subject {}
public interface Mathematics extends Subject {}

下一步

public class Instructor<T extends Subject> {
  ...
}

然后，您可以只为您的“类(class)”创建一个类(class)

public class SchoolClass<T extends Subject> {
  Instructor<T> prof;
  ArrayList<Student<T>> students;
}