堆栈内存溢出
  简体   繁体   English

Java-从文件传输信息时2D数组未填充

[英]Java - 2d Array not filling when transferring info from file

 原文  2017-03-29 11:56:04  9   1    java/ arrays/ io

问题描述

In my program I am trying to read a file that contains Strings, booleans and doubles. 在我的程序中，我试图读取一个包含字符串，布尔值和双精度数的文件。 I'm trying to have it skip a line if it determines that it isn't a double when filling an array. 我试图让它跳过一行，如果它确定在填充数组时不是双精度型。 This is done by first checking if there is data on the line. 首先检查线路上是否有数据。 Then it determines if the first character is a number or not. 然后确定第一个字符是否为数字。 However, when I print the supposedly filled array with Arrays.deepToString it shows this: 但是，当我用Arrays.deepToString打印据称已填充的数组时，它显示如下： 

[[2.33, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], ...

I was wondering if anyone could tell me why it isn't filling properly. 我想知道是否有人可以告诉我为什么填充不正确。 Here is the sample code: 这是示例代码： 

public static double[][] readFile(String fileName) throws IOException
{
    double data[][] = new double[30][6];
    int indexRow = 0, indexCol = 0;

    File file = new File(fileName);
    Scanner input = new Scanner(file);

    while(input.hasNext())
    {
        String temp = input.nextLine();

        if(temp.trim().length() > 0)
        {
            if(Character.isDigit(temp.charAt(0)))
            {
                data[indexRow][indexCol] = input.nextDouble();

                if(indexCol < 6) indexCol++;
                if(indexRow < 30 && indexCol % 6 == 0)
                {
                    indexRow++;
                    indexCol = 0;
                }
            }
            else{}
        }   
        else
            break;
    }
    System.out.println(Arrays.deepToString(data));

    return data;
}

Here is a sample of the file (it should just fill the array with the doubles): 这是文件的一个示例（它应该只用双精度填充数组）： 

Washington Capitals
3.02
2.33
85.2
30.6
28.4
True
Dallas Stars
3.23
2.78
82.3
32.0
28.9
True
St. Louis Blues
2.67
2.40
85.1
30.2
29.7
True

Thanks in advance. 提前致谢。

EDIT Here is the current array: 编辑这是当前数组： 

[[3.02, 2.33, 85.2, 30.6, 28.4], [3.23, 2.78, 82.3, 32.0, 28.9], [2.67, 2.4, 85.1, 30.2, 29.7], [2.94, 2.43, 84.4, 33.2, 29.7], [2.83, 2.44, 79.5, 28.8, 29.5], [2.85, 2.52, 80.3, 30.5, 30.8], [2.62, 2.29, 87.2, 30.3, 27.5], [2.72, 2.34, 81.4, 32.0, 27.5], [2.84, 2.62, 78.2, 28.5, 30.4], [2.77, 2.57, 84.5, 29.4, 30.4], [2.89, 2.52, 80.5, 30.4, 27.4], [2.73, 2.41, 84.0, 29.3, 28.9], [2.73, 2.6, 81.2, 30.6, 27.3], [2.57, 2.56, 80.5, 31.0, 30.7], [2.88, 2.78, 82.2, 32.0, 30.4], [2.55, 2.67, 81.5, 29.7, 29.7], [2.6, 2.49, 77.9, 29.0, 28.6], [2.39, 2.7, 84.3, 29.9, 27.6], [2.8, 2.94, 75.8, 28.4, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0]]

Here is the full file: 这是完整的文件： 

Carolina Hurricanes
2.39
2.70
84.3
29.9
27.6
False
Ottawa Senators
2.80
2.94
75.8
28.4
32.8
False
New Jersey Devils
2.22
2.46
83.0
24.4
28.6
False
Colorado Avalanche
2.59
2.93
80.2
28.6
32.3
False
Montréal Canadiens
2.63
2.84
81.9
30.5
29.4
False
Buffalo Sabres
2.43
2.62
82.6
29.5
30.6
False
Winnipeg Jets
2.59
2.88
78.4
29.6
29.5
False
Arizona Coyotes
2.54
2.98
77.3
27.6
31.0
False
Calgary Flames
2.79
3.13
75.5
29.2
29.0
False
Columbus Blue Jackets
2.60
3.02
81.0
29.1
31.1
False
Vancouver Canucks
2.27
2.91
81.1
28.2
32.5
False
Edmonton Oilers
2.43
2.95
81.1
29.1
31.1
False
Toronto Maple Leafs
2.34
2.93
81.6
30.7
30.5
False

1 个解决方案

解决方案1
 0 已采纳  2017-03-29 15:28:47

this code worked perfectly for me with your sample input 此代码对您的示例输入非常适合我 

public static double[][] readFile(String fileName) throws IOException {
    double data[][] = new double[30][6];
    int indexRow = 0, indexCol = 0;

    File file = new File(fileName);
    try (Scanner input = new Scanner(file)) {
        while (input.hasNext()) {
            String temp = input.nextLine();

            if (temp.trim().length() == 0) {
                continue;
            } else {
                if (Character.isDigit(temp.charAt(0))) {
                    data[indexRow][indexCol] = Double.parseDouble(temp);

                    if (indexCol < 6)
                        indexCol++;
                    if (indexRow < 30 && indexCol % 6 == 0) {
                        indexRow++;
                        indexCol = 0;
                    }
                } else {
                    //do something
                }
            }
        }
    }
    System.out.println(Arrays.deepToString(data));

    return data;
}

this is how I tested it 这就是我测试的方式 

public static void main(String[] args) throws IOException {
    double[][] result = readFile("array.txt");

    for (int i = 0; i < result.length; i++) {
        boolean isFirst = true;
        for (int k = 0; k < result[i].length; k++) {
            if (isFirst)
                isFirst = false;
            else
                System.out.print(", ");
            System.out.printf("%5s", result[i][k]);
        }
        System.out.println();
    }
}

and here's the output 这是输出 

[[3.02, 2.33, 85.2, 30.6, 28.4, 3.23], [2.78, 82.3, 32.0, 28.9, 2.67, 2.4], [85.1, 30.2, 29.7, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]]
 3.02,  2.33,  85.2,  30.6,  28.4,  3.23
 2.78,  82.3,  32.0,  28.9,  2.67,   2.4
 85.1,  30.2,  29.7,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0
  0.0,   0.0,   0.0,   0.0,   0.0,   0.0

my function readFile implemented with a BufferedReader 我的功能readFile用BufferedReader实现 

public static double[][] readFile(String fileName) throws IOException {
    double data[][] = new double[30][6];
    int indexRow = 0, indexCol = 0;

    File file = new File(fileName);
    try (BufferedReader input = new BufferedReader(new FileReader(file))) {
        String temp = input.readLine();
        while (temp != null) {
            if (temp.trim().length() > 0) {
                if (Character.isDigit(temp.charAt(0))) {
                    data[indexRow][indexCol] = Double.parseDouble(temp);

                    if (indexCol < 6)
                        indexCol++;
                    if (indexRow < 30 && indexCol % 6 == 0) {
                        indexRow++;
                        indexCol = 0;
                    }
                } else {
                    //do something
                }
            }

            temp = input.readLine();
        }
    }
    System.out.println(Arrays.deepToString(data));

    return data;
}

暂无
暂无

声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.

相关问题 JAVA从行数未知的文件填充2D数组 - JAVA Filling a 2D array from a file with an unknown amount of rows 用Java填充2D数组 - Filling a 2D array in Java 使用从文件输入的数据用字符填充2D数组-Java - Filling a 2D array with characters using data input from file - Java 从文本文件填充布尔二维数组 - Filling boolean 2D array from text file 用循环填充Java 2D数组输入 - Filling Java 2D array input with loop 填充Java 2D数组输入 - Filling Java 2D array input 在 Java 中填充 2D 数组并获取 ExceptionOutOfBounds - Filling 2D Array in Java and getting ExceptionOutOfBounds 用随机整数填充二维数组 - FIlling a 2D array with random integers java Java-像二维数组一样填充多维（2d）ArrayList - Java - Filling multidimensional (2d) ArrayList like a 2d array 填充二维数组 - Filling 2d array
相关标签
 
粤ICP备18138465号  © 2020-2024 STACKOOM.COM