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淺談Java設(shè)計(jì)模式之原型模式知識(shí)總結(jié)

更新時(shí)間：2021年05月26日 08:40:48 作者：?jiǎn)褑阎?

Java原型模式主要用于創(chuàng)建重復(fù)的對(duì)象,同時(shí)又能保證性能,這篇文章就帶大家仔細(xì)了解一下原型模式的知識(shí),對(duì)正在學(xué)習(xí)java的小伙伴們很有幫助,需要的朋友可以參考下

如何使用？

1.首先定義一個(gè)User類(lèi)，它必須實(shí)現(xiàn)了Cloneable接口，重寫(xiě)了clone()方法。

public class User implements Cloneable {
    private String name;
    private int age;
    private Brother brother;

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

2.Brother類(lèi)

public class Brother{
	private String name;
}

3.應(yīng)用演示類(lèi)

public class PrototypeDemo {
    public static void main(String[] args) throws CloneNotSupportedException {
        User user1 = new User();
        user1.setName("秋紅葉");
        user1.setAge(20);
        Brother brother1 = new Brother();
        brother1.setName("七夜圣君");
        user1.setBrother(brother1);
        // 我們從克隆對(duì)象user2中修改brother，看看是否會(huì)影響user1的brother
        User user2 = (User) user1.clone();
        user2.setName("燕赤霞");
        Brother brother2 = user2.getBrother();
        brother2.setName("唐鈺小寶");
        System.out.println(user1);
        System.out.println(user2);
        System.out.println(user1.getBrother() == user2.getBrother());
    }
}

在這里插入圖片描述

4.深拷貝寫(xiě)法

這是User類(lèi)

public class User implements Cloneable {
    private String name;
    private int age;
    private Brother brother;

	/**
	* 主要就是看這個(gè)重寫(xiě)的方法，需要將brother也進(jìn)行clone
	*/
    @Override
    protected Object clone() throws CloneNotSupportedException {
        User user = (User) super.clone();
        user.brother = (Brother) this.brother.clone();
        return user;
    }
}

這是Brother類(lèi)

public class Brother implements Cloneable{
    private String name;

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

這里是結(jié)果演示

public class PrototypeDemo {
    public static void main(String[] args) throws CloneNotSupportedException {
        User user1 = new User();
        user1.setName("秋紅葉");
        user1.setAge(20);
        Brother brother1 = new Brother();
        brother1.setName("七夜圣君");
        user1.setBrother(brother1);
		// 我們從克隆對(duì)象user2中修改brother，看看是否會(huì)影響user1的brother
        User user2 = (User) user1.clone();
        user2.setName("燕赤霞");
        Brother brother2 = user2.getBrother();
        brother2.setName("唐鈺小寶");
        System.out.println(user1);
        System.out.println(user2);
        System.out.println(user1.getBrother() == user2.getBrother());
    }
}

在這里插入圖片描述