如何在另一个类中使用一个类中的变量？

// Person类
public class Person {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

// Employee类
public class Employee {
    private Person person;

    public Employee(Person person) {
        this.person = person;
    }

    public void printPersonName() {
        System.out.println(person.getName());
    }
}

// 在其他类中使用
public class Main {
    public static void main(String[] args) {
        Person person = new Person();
        person.setName("John");

        Employee employee = new Employee(person);
        employee.printPersonName(); // 输出：John
    }
}