33.Map

Posted 2020-12-11 luzhanshi

1.概述

 

 

 

 

2.Map的获取功能

 

 

 3.遍历

　　方式1:

        HashMap<String, String> hashMap = new HashMap<>();
        hashMap.put("001","张飞");
        hashMap.put("002","关于");
        hashMap.put("003","赵云");
        Set<String> stringSet = hashMap.keySet();
        for (String key:stringSet){
            System.out.println(key+":"+hashMap.get(key));
        }

　　方式2:

　　　　　　

        Set<Map.Entry<String, String>> entries = hashMap.entrySet();
        for (Map.Entry<String, String> m:entries){
            System.out.println(m.getKey()+":"+m.getValue());
        }