【exam answer 1】

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题目描述： 输入的第一行为n（n<40）,表示有n个同学，接下来的n行每行有4个输入，分别为该学生的名字,语、数、外成绩，请按照排序规则对学生进行排序，规则如下： 1、总成绩高的排在前面 <br>2、总成绩相同的情况下，语文成绩高的排在前面。 <br>3、在总成绩，语文成绩都相同的情况下，数学成绩高的排在前面。 4、在成绩都相同的情况下，先输入的同学排在前面。<br><br>参考答案:

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package package01;   import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.util.Scanner; import java.util.Set; import java.util.TreeMap;   /**  * 题目描述：  * 输入的第一行为n（n<40）,表示有n个同学，接下来的n行每行有4个输入，分别为该学生的名字,语、数、外成绩，请按照排序规则对学生进行排序，规则如下：  * 1、总成绩高的排在前面 <br> * 2、总成绩相同的情况下，语文成绩高的排在前面。 <br> * 3、在总成绩，语文成绩都相同的情况下，数学成绩高的排在前面。  * 4、在成绩都相同的情况下，先输入的同学排在前面。  *  * 例如依次输入：  * 3  * aa 70 80 75  * bb 80 85 90  * cc 60 65 88  *  */ public class Main {       public static void main(String[] args) {         Scanner sc = new Scanner(System.in);         int input = sc.nextInt();           func(input, sc);       }       public static void func(int input, Scanner sc) {         if (input >= 1 && input <= 40) {             String[] arr = new String[input + 1];             TreeMap<String, Integer> map = new TreeMap<>();             for (int i = 0; i < input + 1; i++) {                 arr[i] = sc.nextLine();             }               for (int i = 1; i < arr.length; i++) {                 int chinese = Integer.parseInt(arr[i].split(" ")[1]);                 int math = Integer.parseInt(arr[i].split(" ")[2]);                 int english = Integer.parseInt(arr[i].split(" ")[3]);                 int totalScore = chinese + math + english;                 map.put(i + "," + arr[i], totalScore);             }               List<Entry<String, Integer>> arrayList = new ArrayList<>(map.entrySet());               Collections.sort(arrayList, new Comparator<Map.Entry<String, Integer>>() {                 @Override                 public int compare(Entry<String, Integer> o1, Entry<String, Integer> o2) {                     // 降序                     if (o2.getValue().compareTo(o1.getValue()) != 0) {                         return o2.getValue().compareTo(o1.getValue());                     } else {                         int chinese1 = Integer.parseInt(o1.getKey().split(" ")[1]);                         int chinese2 = Integer.parseInt(o2.getKey().split(" ")[1]);                         if (chinese2 < chinese1) {                             return -1;                         } else if (chinese1 > chinese2) {                             return 1;                         } else {                             int math1 = Integer.parseInt(o1.getKey().split(" ")[2]);                             int math2 = Integer.parseInt(o2.getKey().split(" ")[2]);                             if (math2 < math1) {                                 return -1;                             } else if (math1 > math2) {                                 return 1;                             } else {                                 int english1 = Integer.parseInt(o1.getKey().split(" ")[3]);                                 int english2 = Integer.parseInt(o2.getKey().split(" ")[3]);                                 if (english2 < english1) {                                     return -1;                                 } else if (english2 > english1) {                                     return 1;                                 } else {                                     int p1 = Integer.parseInt(o1.getKey().split(",")[0]);                                     int p2 = Integer.parseInt(o2.getKey().split(",")[0]);                                     if (p2 < p1) {                                         return -1;                                     } else {                                         return 1;                                     }                                 }                               }                         }                     }                 }             });               for (Entry<String, Integer> tmp : arrayList) {                 System.out.println(tmp.getKey().split(",")[1]);             }         } else {             System.err.println("输入的同学个数有误，请重新输入！");               sc = new Scanner(System.in);             input = sc.nextInt();               func(input, sc);         }       }   }