Java中浅拷贝和深拷贝详解

class Person implements Cloneable {
    String name;
    int age;

    public Person() {
    }

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

    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;
    }

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

    @Override
    public String toString() {
        return "Person{" +
            "name='" + name + '\'' +
            ", age=" + age +
            '}';
    }
}

public void testClone() throws CloneNotSupportedException {
    Person person1 = new Person();
    person1.setName("ccy");
    person1.setAge(20);
    Person person2 = (Person) person1.clone();
    //查看浅拷贝效果
    System.out.println(person1);
    System.out.println(person2);
    System.out.println(person1.getName() == person2.getName());
    //验证clone()的特性
    System.out.println(person1.clone() != person1);
    System.out.println(person1.clone().getClass() == person1.getClass());
    //如果是基本类型浅拷贝直接赋值值，如果是引用类型浅拷贝指向其内存地址即共享内存地址
    //改变person1的引用类型String属性的值,引用发生改变
    person1.setName("zfs");
    System.out.println(person2.getName());
}

class Person implements Serializable {
    String name;
    int age;

    public Person() {
    }

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

    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;
    }

    @Override
    public String toString() {
        return "Person{" +
            "name='" + name + '\'' +
            ", age=" + age +
            '}';
    }

    protected Person deepClone() throws Exception {
        //序列化
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(bos);

        oos.writeObject(this);

        //反序列化
        ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
        ObjectInputStream ois = new ObjectInputStream(bis);

        return (Person) ois.readObject();
    }
}

public void testClone() throws Exception {
    Person person1 = new Person();
    person1.setName("ccy");
    person1.setAge(20);
    Person person2 = person1.deepClone();
    System.out.println(person1.getName() == person2.getName());
}