Java设计模式-原型模式（六）

最新推荐文章于 2024-07-24 09:09:29 发布

Andy_Zheng.

最新推荐文章于 2024-07-24 09:09:29 发布

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分类专栏：设计模式

本文链接：https://blog.youkuaiyun.com/xyajia/article/details/116139274

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一、什么是原型模式

用原型实例指定创建对象的种类，并通过拷贝这些原型创建新的对象，称之为原型模式（Prototype模式）

二、示例程序

1、Product

package com.as.module.prototype;

/**
 * 产品
 * @author Andy
 * @date 2021/4/25 22:11
 */
public interface Product extends Cloneable{
    public abstract void use(String s);
    public abstract Product createClone();

}

2、Manager类

package com.as.module.prototype;

import java.util.HashMap;

/**
 * TODO
 * @author Andy
 * @date 2021/4/25 22:12
 */
public class Manager {
    private HashMap showcase = new HashMap();
    public void register(String name,Product proto){
        showcase.put(name,proto);
    }

    public Product create(String protoname){
        Product p = (Product) showcase.get(protoname);
        return p.createClone();
    }
}

3、MessageBox类

package com.as.module.prototype;

/**
 * TODO
 *
 * @author Andy
 * @date 2021/4/25 22:31
 */
public class MessageBox implements Product{
    private char decochar;

    public MessageBox(char decochar){
        this.decochar = decochar;
    }

    public void use(String s){
        int length = s.getBytes().length;
        for(int i= 0;i<length+4;i++){
            System.out.print(decochar);
        }
        System.out.println("");
        System.out.println(decochar+" "+s+" "+decochar);
        for(int i=0;i<length+4;i++){
            System.out.print(decochar);
        }
        System.out.println("");
    }

    @Override
    public Product createClone() {
        Product p = null;
        try {
            p = (Product) clone();
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        return p;
    }
}

4、UnderlinePen类

package com.as.module.prototype;

/**
 * TODO
 *
 * @author Andy
 * @date 2021/4/25 22:37
 */
public class UnderlinePen implements Product{
    private char ulchar;
    public UnderlinePen(char ulchar){
        this.ulchar = ulchar;
    }
    @Override
    public void use(String s) {
        int length = s.getBytes().length;
        System.out.println("\""+s+"\"");
        System.out.print(" ");
        for(int i=0;i<length;i++){
            System.out.print(ulchar);
        }
        System.out.println("");
    }

    @Override
    public Product createClone() {
        Product p = null;
        try {
            p = (Product) clone();
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        return p;
    }
}

5、TestPrototype类

package com.as.module.prototype;

/**
 * TODO
 *
 * @author Andy
 * @date 2021/4/25 22:40
 */
public class TestPrototype {

    public static void main(String[] args) {
        //准备
        Manager manager = new Manager();
        UnderlinePen upen = new UnderlinePen('~');
        MessageBox mbox = new MessageBox('*');
        MessageBox sbox = new MessageBox('/');
        manager.register("strong message",upen);
        manager.register("warning box",mbox);
        manager.register("slash box",sbox);


        //生成
        Product p1 = manager.create("strong message");
        p1.use("Hello,world.");
        Product p2 = manager.create("warning box");
        p2.use("Hello,world.");
        Product p3 = manager.create("slash box");
        p3.use("Hello,world.");

    }
}

6、运行结果