06-原型模式

Posted 2023-01-19 Oh,mydream!

06-原型模式

概念

原型模式，不知道为啥叫这个名字，直接叫克隆模式不比原型模式顾名思义的多？
主要涉及的知识就是深拷贝和浅拷贝
浅拷贝是值直接复制拷贝。对象的话是拷贝了一份地址的值，指向的还是同一个对象

实现

package com.gof.proto;

import lombok.Data;

/**
 * 功能描述
 *
 * @since 2023-01-19
 */
@Data
public class Resume implements Cloneable 
    private String name;

    private String age;

    private String sex;

    private WorkExperience workExperience;

    @Override
    protected Object clone() throws CloneNotSupportedException 
        // 浅拷贝
        // return super.clone();

        // 深拷贝
        Resume resume = (Resume) super.clone();
        resume.setWorkExperience((WorkExperience) resume.getWorkExperience().clone());
        return resume;
    

    @Override
    public String toString() 
        return "Resume" + "name=\'" + name + \'\\\'\' + ", age=\'" + age + \'\\\'\' + ", sex=\'" + sex + \'\\\'\'
            + ", workExperience=" + workExperience + \'\';
    

package com.gof.proto;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * 功能描述
 *
 * @since 2023-01-19
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class WorkExperience implements Cloneable 
    private String datetime;

    private String experience;

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

package com.gof.proto;

/**
 * 功能描述
 *
 * @since 2023-01-19
 */
public class Client 
    public static void main(String[] args) throws CloneNotSupportedException 
        Resume resume = new Resume();
        resume.setName("dream");
        resume.setAge("18");
        WorkExperience experience = new WorkExperience("2023", "asdfasdf");
        resume.setWorkExperience(experience);

        Resume resume1 = (Resume) resume.clone();
        resume.setName("dream1");
        resume.setAge("19");
        System.out.println(resume);
        System.out.println(resume1);
        System.out.println(resume.getWorkExperience() == resume1.getWorkExperience()); // 浅拷贝:true 深拷贝：false 
        System.out.println(resume.getWorkExperience().equals(resume1.getWorkExperience()));// 浅拷贝:true 深拷贝：true 
    

总结

原型模式在java中实现深拷贝是通过手动在clone()方法中实现的，多层深拷贝以此类推