*8.3（按考分对学生排序）重写程序清单8-2，按照正确答案个数的升序显示学生

• 题目
• • 题目描述
  • 程序清单8-2
• 本题代码

题目

题目描述

*8.3（按考分对学生排序）重写程序清单8-2，按照正确答案个数的升序显示学生

程序清单8-2

public class qingdan {public static void main(String[] args) {// Students' answers to the questionschar[][] answers = {{'A', 'B', 'A', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},{'D', 'B', 'A', 'B', 'C', 'A', 'E', 'E', 'A', 'D'},{'E', 'D', 'D', 'A', 'C', 'B', 'E', 'E', 'A', 'D'},{'C', 'B', 'A', 'E', 'D', 'C', 'E', 'E', 'A', 'D'},{'A', 'B', 'D', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},{'B', 'B', 'E', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},{'B', 'B', 'A', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},{'E', 'B', 'E', 'C', 'C', 'D', 'E', 'E', 'A', 'D'}};//Key to the questionschar[] keys = {'D', 'B', 'D', 'C', 'C', 'D', 'A', 'E', 'A', 'D'};//Grade all answersfor (int i = 0 ; i < answers.length ; i++){// Grade one studentint correctCount = 0;for (int j = 0 ; j < answers[i].length ; j++){if (answers[i][j] == keys[j])correctCount++;}System.out.println("Student " + i + "'s correct count is " + correctCount);}}
}

清单运行：

Student 0's correct count is 7
Student 1's correct count is 6
Student 2's correct count is 5
Student 3's correct count is 4
Student 4's correct count is 8
Student 5's correct count is 7
Student 6's correct count is 7
Student 7's correct count is 7

本题代码

import java.util.Arrays;public class Test8_3 {public static void main(String[] args) {// Students' answers to the questionschar[][] answers = {{'A', 'B', 'A', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},{'D', 'B', 'A', 'B', 'C', 'A', 'E', 'E', 'A', 'D'},{'E', 'D', 'D', 'A', 'C', 'B', 'E', 'E', 'A', 'D'},{'C', 'B', 'A', 'E', 'D', 'C', 'E', 'E', 'A', 'D'},{'A', 'B', 'D', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},{'B', 'B', 'E', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},{'B', 'B', 'A', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},{'E', 'B', 'E', 'C', 'C', 'D', 'E', 'E', 'A', 'D'}};//Key to the questionschar[] keys = {'D', 'B', 'D', 'C', 'C', 'D', 'A', 'E', 'A', 'D'};// 增加：数组answers行数长度的int型数组int[] scores = new int[answers.length];//Grade all answersfor (int i = 0 ; i < answers.length ; i++){// Grade one studentint correctCount = 0;for (int j = 0 ; j < answers[i].length ; j++){if (answers[i][j] == keys[j])correctCount++;}scores[i] = correctCount;}//增加：复制scores数组int[] scores_copy = new int[scores.length];System.arraycopy(scores, 0 , scores_copy, 0 , scores.length);//增加：对scores_copy进行排序Arrays.sort(scores_copy);//增加：遍历scores_copy的元素，匹配scores数组的元素，scores的下标即为学生for (int a = 0 ; a < scores_copy.length ; a++){for (int b = 0 ; b < scores.length ; b++){if (scores_copy[a] == scores[b]){System.out.println("Student " + b + "'s correct count is " + scores_copy[a]);scores[b] = 0;}}}}
}

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