Question

我得到了不同的输出。我想要的输出是 - 测验：66％实验室：88％实验室出勤率：81％中期：91％最终：不适用总体平均值：85％。但是我得到了

输出：

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

我的方法规范化是假设获得百分比然后转到平均方法。我将此方法称为quizArray，labArray，考勤，midterms，以尝试获得每个人的成绩。

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，默认情况下会显示类名表示，然后添加@，然后再添加哈希码。我假设您正在打印System.out.println(someArray)。

你应该使用Arrays#toString()（以下是它的实现，以便你能更好地理解它）：

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    }

获得不同的输出

1 个答案: