Map＜K,V＞种按value值大小排序

按key也可以&＃xff0c;这里先不写了
Map四种获取key和value值的方法&＃xff0c;以及对map中的元素排序

package test.score;import java.util.*;public class Test21 {public static void main(String[] args) {//这几种Map的定义都可以//HashMap hashMap &＃61; new HashMap<>();//Map treeMap &＃61; new TreeMap<>();//Map hashMap &＃61; new HashMap<>();TreeMap<String, Integer> treeMap &＃61; new TreeMap<>();treeMap.put("谷岡",310);treeMap.put("住石",310);treeMap.put("清水",339);treeMap.put("中島",320);ArrayList<Map.Entry<String, Integer>> list &＃61; new ArrayList<>(treeMap.entrySet());Collections.sort(list, new Comparator<Map.Entry<String, Integer>>() {&＃64;Overridepublic int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {//降序排列return o2.getValue()- o1.getValue();//return o2.getValue().compareTo(o1.getValue());//升序排列//return o1.getValue().compareTo(o2.getValue());//return o1.getValue()- o2.getValue();}});for (Map.Entry<String, Integer> entry: list) {System.out.println(entry.getKey()&＃43;" "&＃43;entry.getValue());}}
}