将.txt文件中的数字读入二维数组并在控制台上打印 [英] Reading numbers from a .txt file into a 2d array and print it on console

问题描述

所以基本上，我试图读取一个包含以下内容的.txt文件:

So basically i am trying to read a .txt file that contains these following in it:

3 5 

2 3 4 5 10

4 5 2 3 7

-3 -1 0 1 5

并将它们存储到2D数组中并在控制台上打印，我从控制台获得的信息很好，但只缺少第一行3 5，我不知道我的代码有什么问题，因此忽略了第一行. 我现在得到的输出是什么:

and store them into 2D array and print it on console, what i got from the console is fine but only missing the first row 3 5, which i do not know what is wrong with my code made it ignored the first line. what i got as output now:

2  3  4  5 10 

4  5  2  3  7

-3 -1  0  1  5 

---

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

public class Driver0 {
    public static int[][] array;
    public static int dimension1, dimension2;

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("Welcome to Project 0.");
        System.out.println("What is the name of the data file? ");
        String file = input.nextLine();
        readFile(file);
    }

    public static void readFile(String file) {
        try {
            Scanner sc = new Scanner(new File(file));
            dimension1 = sc.nextInt();
            dimension2 = sc.nextInt();
            array = new int[dimension1][dimension2];
            while (sc.hasNext()) {
                for (int row = 0; row < dimension1; row++) {
                    for (int column = 0; column < dimension2; column++) {
                        array[row][column] = sc.nextInt();
                        System.out.printf("%2d ", array[row][column]);
                    }
                    System.out.println();
                }

            }
            sc.close();
        }

        catch (Exception e) {
            System.out
            .println("Error: file not found or insufficient     requirements.");
        }
    }
}

推荐答案

您可以使用Stream API轻松实现

You can use Stream API to do it easily

public static Integer[][] readFile(String path) throws IOException {
    return Files.lines(Paths.get(path)) // 1
            .filter(line -> !line.trim().isEmpty()) // 2
            .map(line -> Arrays.stream(line.split("[\\s]+")) // 3
                    .map(Integer::parseInt) // 4
                    .toArray(Integer[]::new)) // 5
            .toArray(Integer[][]::new); // 6
}

1. 将文件读取为行流
2. 忽略空行
3. 用空格将每一行分开
4. 解析拆分的String值以获取Integer值
5. 创建一个整数值数组
6. 以2D数组收集它

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