关于java:java浅拷贝和深拷贝的区别的代码实现

浅拷贝：创立一个新对象，新对象的属性和原来对象完全相同，对于非根本类型属性，仍指向原来对象的属性所指向的对象的内存地址。

深拷贝：创立一个新对象，属性中援用的其余对象也会被克隆，不再指向原有对象地址。
换言之，深拷贝把要复制的对象所援用的对象都复制了一遍

package org.springblade.modules.prototype;

import lombok.Data;
import java.io.*;

/**
 * @author zdx
 * @description
 */

@Data
public class Person implements Cloneable, Serializable {

    private String name;

    private Integer age;

    private Address address;

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

package org.springblade.modules.prototype;

import lombok.Data;
import java.io.Serializable;

/**
 * @author zdx
 * @description
 */

@Data
public class Address {

    private String name;
}

package org.springblade.modules.prototype;

/**
 * @author zdx
 * @description
 */
public class Main {

    public static void main(String[] args) throws CloneNotSupportedException {
        Person person = new Person();
        Address address = new Address();
        address.setName("福建省");
        person.setAddress(address);

        Person person1 = (Person) person.clone();
        System.out.println("person == person1=======" + (person == person1));
        System.out.println("person.getAddress() == person1.getAddress()===========" + (person.getAddress() == person1.getAddress()));
    }
}

咱们能够看出 person和person1外面的address对象是同一个所以以后是浅拷贝。
接下来咱们通过两种形式来实现深拷贝

1.传统的形式实现,在person实体类中重写clone办法(必须先实现Cloneable接口),Address实体类也要实现Cloneable接口

2.采纳对象序列化和反序列化的形式(举荐形式)
(1)persion和address两个实体类都要实现序列化接口Serializable
(2)persion实体类重写clone办法

package org.springblade.modules.prototype;

import lombok.Data;
import java.io.*;

/**
 * @author zdx
 * @description
 */

@Data
public class Person implements Cloneable, Serializable {

    private String name;

    private Integer age;

    private Address address;

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

    public Person deepClone() {
        try {
            // 序列化
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(bos);
            oos.writeObject(this);

            // 反序列化
            ByteArrayInputStream bais = new ByteArrayInputStream(bos.toByteArray());
            ObjectInputStream bis = new ObjectInputStream(bais);
            return (Person) bis.readObject();
        } catch (Exception ex) {
            ex.printStackTrace();
            return null;
        }
    }
}