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// 发动机类
class Engine {
public:void start() {std::cout << "Engine started." << std::endl;}
};

// 身份证类
class IDCard {
public:std::string idNumber;
};

// 抽象类车
class Vehicle {
public:virtual void drive() = 0;  // 纯虚函数，使类成为抽象类
};

// 小汽车类，实现车类
class SmallCar : public Vehicle {
private:Engine engine;public:void drive() override {engine.start();std::cout << "Small car is driving." << std::endl;}
};

// SUV类，继承小汽车类
class SUV : public SmallCar {
public:void drive() override {std::cout << "SUV is driving to the mountains." << std::endl;}
};

// 自行车类，实现车类
class Bicycle : public Vehicle {
public:void drive() override {std::cout << "Bicycle is riding." << std::endl;}
};

// 班级类
class Class {
private:std::vector<Student*> students;  // 聚合学生类public:void addStudent(Student* student) {students.push_back(student);}
};

// 学生类
class Student {
private:IDCard idCard;Class* classObj;  // 聚合班级类public:Student(Class* class_) : classObj(class_) {}void goToSchool(Bicycle* bicycle) {  // 依赖自行车类std::cout << "Student is going to school by bicycle." << std::endl;bicycle->drive();}
};

完整代码
 

#include <iostream>
#include <vector>// 发动机类
class Engine {
public:void start() {std::cout << "Engine started." << std::endl;}
};// 身份证类
class IDCard {
public:std::string idNumber;
};// 抽象类车
class Vehicle {
public:virtual void drive() = 0;  // 纯虚函数，使类成为抽象类
};// 小汽车类，实现车类
class SmallCar : public Vehicle {
private:Engine engine;public:void drive() override {engine.start();std::cout << "Small car is driving." << std::endl;}
};// SUV类，继承小汽车类
class SUV : public SmallCar {
public:void drive() override {std::cout << "SUV is driving to the mountains." << std::endl;}
};// 自行车类，实现车类
class Bicycle : public Vehicle {
public:void drive() override {std::cout << "Bicycle is riding." << std::endl;}
};// 班级类
class Class {
private:std::vector<Student*> students;  // 聚合学生类public:void addStudent(Student* student) {students.push_back(student);}
};// 学生类
class Student {
private:IDCard idCard;Class* classObj;  // 聚合班级类public:Student(Class* class_) : classObj(class_) {}void goToSchool(Bicycle* bicycle) {  // 依赖自行车类std::cout << "Student is going to school by bicycle." << std::endl;bicycle->drive();}
};int main() {// 创建班级对象Class schoolClass;// 创建学生对象并关联班级Student student1(&schoolClass);// 创建自行车对象Bicycle bicycle;// 学生骑自行车上学student1.goToSchool(&bicycle);// 创建小汽车对象并驾驶SmallCar smallCar;smallCar.drive();// 创建 SUV 对象并驾驶SUV suv;suv.drive();return 0;
}