java - Java 需要学生成绩排序帮助

Question

import java.util.Scanner;
import java.util.Arrays;

class StudentScores {
public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    System.out.print("Enter the # of students");
    int numOfStudents = input.nextInt();
    int[] scores = new int[numOfStudents];
    String[] names = new String[numOfStudents];

    for (int i = 0; i < numOfStudents; i++) {
        input.nextLine();
        System.out.print("Enter name: ");
        names[i] = input.nextLine();
        System.out.print("Enter score: ");
        scores[i] = input.nextInt();
    }

                    // This doesn't sort anything, it just prints out the result in unsorted way
    /*for (int i = 0; i < numOfStudents; i++) {
        System.out.println(names[i] + " " + scores[i]);
    }*/

    Arrays.sort(scores);
    reverse(scores);


    for (int u: scores) {
        System.out.println(u);
    }
}

   public static int[] reverse(int[] array) {
    for (int i = 0, j = array.length - 1; i < j; i++, j--) {
        int temp = array[i];
        array[i] = array[j];
        array[j] = temp;
    }

    return array;
  }
 }

原来的问题是:编写一个程序，提示用户输入学生人数、学生姓名和分数，并按分数降序打印学生姓名。

我的问题是 如何在分数排序列表中显示名称？

你不一定要给我一个完整的解决方案，只要给我一个提示，这样我就可以自己解决它。

Answer 1

您可以将相关字段封装到一个类中，例如StudentRecord 可以封装字段 name 和 score。

现在，您可以根据第二个字段 score 对这些对象的集合进行排序。当需要打印排序结果时，您可以迭代集合并打印第一个字段 name。

举例说明:

public class StudentRecord implements Comparable<StudentRecord> {

    private String name;
    private int score;

    public StudentRecord(String name, int score) {
        this.name = name;
        this.score = score;
    }

    @Override
    public int compareTo(StudentRecord other) {
        if (score == other.score) return 0;
        else if (score < other.score) return -1;
        else return 1;
    }

    @Override
    public String toString() {
        return name;
    }


    public static void main(String[] args) {

        StudentRecord stu1 = new StudentRecord("Matt", 50);
        StudentRecord stu2 = new StudentRecord("John", 90);

        if (stu1.compareTo(stu2) == 0) {
            System.out.println(stu1.toString() + " has the same score with " + stu2.toString());
        }
        else if (stu1.compareTo(stu2) < 0) {
            System.out.println(stu1.toString() + " has a lower score than " + stu2.toString());
        }
        else {
            System.out.println(stu1.toString() + " has a higher score than " + stu2.toString());
        }

        // output:
        // Matt has a lower score than John

    }

}

在许多排序算法中，实现Comparable接口(interface)为算法提供了足够的信息来对实现所述接口(interface)的此类对象的集合进行排序。