qq_47896523的博客

HashMap

Map<String,Integer> map = new HashMap<String,Integer>();map.put();//遍历keySet<String> keySet = map.keySet();for(String key : keySet){ System.out.println(key);}//遍历valueCollection<Integer> values = map.values();Iterator<.

Map接口的简述

提供一个方法，用于遍历获取HashMap<String,String>中的所有value,并存放在List中返回。public List<String> getValueList(HashMap<String,String> map){ ArrayList<String> valueList = new ArrayList<>(); Collection<String> values = map