java - 关于深克隆

Question

当我运行下面的代码时，为什么会抛出这个错误？

Exception in thread "main" java.lang.CloneNotSupportedException: Student
    at java.lang.Object.clone(Native Method)
    at Student.clone(Student.java:44)
    at StudentApp.main(StudentApp.java:10)

这是我的主要类(class):

public static void main(String[] args) throws CloneNotSupportedException {

    Address address = new Address("湖南省长沙市林科大","1234567",20);
    Student stu = new Student("诸葛亮量",20);
    stu.setAddress(address);

    Student stu2 = (Student)stu.clone();
    stu2.setAddress(new Address("湖南省常德市区","484848348",22));

    stu2.setName("张飞飞");
    stu2.setAge(23);
    stu.sayHi();
    stu2.sayHi();
}

这是学生类:

public class Student{

    private String name;
    private int age;
    private Address address;

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Student(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }

    public Student() {
        super();
    }

    @Override
    protected Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

    public void sayHi() {
        System.out.println("大家好，我是" + this.getName() + "同学，我今年" + this.getAge()
                + "岁了……我的HashCode是：" + this.hashCode()+"。我家庭住址是"+address.getAddress()+"，家庭住址的HashCode为："+address.hashCode());
    }

}

这是地址类:

public class Address {

    private String address;
    private String tel;
    private int roadNum;

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getTel() {
        return tel;
    }

    public void setTel(String tel) {
        this.tel = tel;
    }

    public int getRoadNum() {
        return roadNum;
    }

    public void setRoadNum(int roadNum) {
        this.roadNum = roadNum;
    }

    public Address() {
        super();
    }

    public Address(String address, String tel, int roadNum) {
        super();
        this.address = address;
        this.tel = tel;
        this.roadNum = roadNum;
    }

}

Answer 1

来自javadoc

Invoking Object's clone method on an instance that does not implement the Cloneable interface results in the exception CloneNotSupportedException being thrown.

你试过让你的Student类实现Cloneable接口(interface)吗？