【设计模式学习笔记】多例模式

秒速五厘米 2022-03-26 06:40 81阅读 0赞

> 多例模式，即多个单例，并不是简单的new new new，算是个极端，不能完全否定吧。

## 文章目录 ##

[1.1 多例模型][1.1]

[1.2 测试][1.2]

[1.3 结果][1.3]

## **1.1 多例模型** ##

package multiton;
    
    import java.util.HashMap;
    import java.util.Map;
    
    /************************************************
     *@ClassName : multiton
     *@Description : TODO
     *@Author : NikolaZhang
     *@Date : 【2018/11/30 21:07】
     *@Version : 1.0.0
     *************************************************/
    
    public class BranchCompany {
        private static Map<String, BranchCompany> map = new HashMap<>();
        private String info;
        static {
            // 预先设置两个分公司
            BranchCompany bjCom = new BranchCompany();
            bjCom.setInfo("这是北京的公司");
            System.out.println("北京的分公司："+bjCom);
            map.put("beijing", bjCom);
            BranchCompany shCom = new BranchCompany();
            shCom.setInfo("这是上海的公司");
            map.put("shanghai", shCom);
            System.out.println("上海的分公司："+shCom);
            System.out.println("==============================");
        }
    
        public static BranchCompany getInstance(String address){
            return map.get(address);
        }
    
        public void getInfo(){
            System.out.println(this.info+"/"+this);
        }
    
        public void setInfo(String info){
            this.info = info;
        }
    }

##   1.2 测试 ##

package multiton;
    
    /************************************************
     *@ClassName : Test
     *@Description : TODO
     *@Author : NikolaZhang
     *@Date : 【2018/11/30 21:17】
     *@Version : 1.0.0
     *************************************************/
    
    public class Test {
        public static void main(String[] args) {
            BranchCompany bj = BranchCompany.getInstance("beijing");
            bj.getInfo();
            BranchCompany sh = BranchCompany.getInstance("shanghai");
            sh.getInfo();
        }
    }

##  1.3 结果 ##

![20181216094835461.png][]

本文原文地址：[https://blog.csdn.net/baidu\_30325009/article/details/85028409][https_blog.csdn.net_baidu_30325009_article_details_85028409]

[1.1]: https://blog.csdn.net/baidu_30325009/article/details/85028409#11__5
[1.2]: https://blog.csdn.net/baidu_30325009/article/details/85028409#12__51
[1.3]: https://blog.csdn.net/baidu_30325009/article/details/85028409#13__74
[20181216094835461.png]: /images/20220326/14c12e7861904035bf029b735886f263.png
[https_blog.csdn.net_baidu_30325009_article_details_85028409]: https://blog.csdn.net/baidu_30325009/article/details/85028409