java Map List转化，通过Map保存数据，通过List排序。取前三名

java Map List转化，通过Map保存数据，通过List排序。取前三名

package yo;import java.util.ArrayList;import java.util.Collections;import java.util.HashMap;import java.util.List;import java.util.Map;public class a {public static void main(String[] args) {Map map = new HashMap();String key;Float value;key = "张三";value = 29.5f;map.put(key, value);key = "张四";value = 19.5f;map.put(key, value);key = "张五";value = 90.5f;map.put(key, value);key = "张六";value = 91.5f;map.put(key, value);key = "张七";value = 94.5f;map.put(key, value);key = "张八";value = 93.5f;map.put(key, value);key = "张九";value = 92.5f;map.put(key, value);System.out.println(map);List<Map.Entry> list = new ArrayList(map.entrySet());Collections.sort(list, Map.Entry.comparingByValue());System.out.println("Top 3:");for (int i = 0; i < 3; i++) {int len = list.size();Map.Entry s = list.get(len - i - 1);System.out.println(s.getKey() + ":" + s.getValue());}}}