小谈设计模式（12）—迪米特法则

// 定义一个学生类
class Student {
    private String name;

    public Student(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }
}

// 定义一个班级类
class Class {
    private String className;
    private List<Student> students;

    public Class(String className, List<Student> students) {
        this.className = className;
        this.students = students;
    }

    public String getClassName() {
        return className;
    }

    public List<Student> getStudents() {
        return students;
    }
}

// 定义一个学校类
class School {
    private String schoolName;
    private List<Class> classes;

    public School(String schoolName, List<Class> classes) {
        this.schoolName = schoolName;
        this.classes = classes;
    }

    public String getSchoolName() {
        return schoolName;
    }

    public List<Class> getClasses() {
        return classes;
    }
}

// 客户端代码
public class Main {
    public static void main(String[] args) {
        // 创建学生对象
        Student student1 = new Student("Tom");
        Student student2 = new Student("Jerry");

        // 创建班级对象
        List<Student> students = new ArrayList<>();
        students.add(student1);
        students.add(student2);
        Class class1 = new Class("Class1", students);

        // 创建学校对象
        List<Class> classes = new ArrayList<>();
        classes.add(class1);
        School school = new School("School1", classes);

        // 输出学校的名称和班级的名称
        System.out.println("School Name: " + school.getSchoolName());
        for (Class c : school.getClasses()) {
            System.out.println("Class Name: " + c.getClassName());
        }

        // 输出班级中的学生姓名
        for (Class c : school.getClasses()) {
            for (Student s : c.getStudents()) {
                System.out.println("Student Name: " + s.getName());
            }
        }
    }
}