java - 获得不同的输出

Question

我得到了不同的输出。我想要的输出是-测验:66%实验室:88%实验室出席率:81%期中考试:91%最终:不适用总体平均分:85%。但我越来越

输出:

[I@176c74b
[I@116471f
[I@1975b59
[I@lee3914

我的方法归一化应该得到百分比，然后转到平均方法。我将此方法称为 quizArray、labArray、attendance、midterms，以尝试获取每个项目的成绩。

import java.io.*;
import java.util.*;

public class FindGrade {
    public static final int NUM_SCORE_TYPES = 5;

    public static void main(String[] args) {
        Scanner scan = null;
        int[] quizArray = null;
        int[] labArray = null;
        int[] attendance = null;
        int[] midterms = null;
        int quizgrade = 0;
        int labgrade = 0;
        int attendance_1 = 0;
        int midterms_1 = 0;
        String name;


        try {
            scan = new Scanner(new File("input.txt"));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            return;
        }

        // each iteration is for single exam type (ie: Quizzes is the 1st one)
        for (int i = 0; i < NUM_SCORE_TYPES; i++) {

            name = scan.next();
            int numScores = scan.nextInt();
            int maxGrade = scan.nextInt();

            if (name.equals("Quizzes")) {
                quizArray = new int[numScores];
                readScores(quizArray, numScores, scan);


            } else if (name.equals("Labs")) {
                labArray = new int[numScores];
                readScores(labArray, numScores, scan);

            } else if (name.equals("Lab_attendance")) {
                attendance = new int[numScores];
                readScores(attendance, numScores, scan);

            } else if (name.equals("Midterms")) {
                midterms = new int[numScores];
                readScores(midterms, numScores, scan);

            }

        }

    }


    public static void readScores(int[] scoreArray, int numScores, Scanner scan) {
        for (int i = 0; i < numScores; i++) {
            scoreArray[i] = scan.nextInt();
        }
        average(scoreArray, numScores);
    }

    public static int normalize(int[] scoreArray, int maxGrade) {
        int total = 0;
        for (int i = 0; i < scoreArray.length; i++) {
            total += scoreArray[i];
        }
        int percent = Math.round(total * 100 / maxGrade);
        return percent;
    }

    public static double average(double[] scoreArray, int numScores) {
        double sum = 0;
        for (int i = 0; i < scoreArray.length; i++) {
            sum += scoreArray[i];
        }
        double average = sum / numScores;

        return average;


    }

输入文件:

Quizzes 8 10
5 8 9 10 4 0 10 7
Labs 6  100
95  90  100  87  63  92
Lab_attendance  16  1
1  1  1  0  1  1  1  1  0  1  1  1  1  0  1  1
Midterms  2  100
87  94
Final  0  100

Answer 1

每个对象都有toString()方法，其默认将显示类名表示，然后添加@，然后添加哈希码。我假设您正在打印 System.out.println(someArray)。

您应该使用Arrays#toString() (下面是它的实现，以便您更好地理解它):

3860     public static String toString(int[] a) { {
3861        if (a == null)
3862            return "null";
3863        int iMax = a.length - 1;
3864        if (iMax == -1)
3865            return "[]";
3866
3867        StringBuilder b = new StringBuilder();
3868        b.append('[');
3869        for (int i = 0; ; i++) {
3870            b.append(a[i]);
3871            if (i == iMax)
3872                return b.append(']').toString();
3873            b.append(", ");
3874        }
3875    }