java - 从文件读取到java中的 boolean 矩阵

Question

我有一个格式如下的文本文件:

5
true, false, true, false, false
true, false, true, true, true
false, false, false, false, true
true, true, false, true, true
false, false, false, true, false

我想将其读入矩阵。 这是我到目前为止所做的事情:

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

public class tests {

    public static void main(String[] args) throws IOException {

        System.out.println("File Name: ");
        Scanner reader = new Scanner(System.in);
        String fileName = reader.nextLine();
        Scanner file = new Scanner(new BufferedReader(new FileReader(fileName)));

        int size = file.nextInt();

        System.out.println("Size: " + size);

        boolean[][] matrix = new boolean[size][size];


        for (int i = 0; i < size; i++) {
            for (int j = 0; j < size; j++) {

                matrix[i][j] = file.nextBoolean();
            }

        }
        reader.close();
        file.close();
    }
}

但是这给了我一个错误:

    Exception in thread "main" java.util.InputMismatchException
    at java.util.Scanner.throwFor(Scanner.java:864)
    at java.util.Scanner.next(Scanner.java:1485)
    at java.util.Scanner.nextBoolean(Scanner.java:1782)
    at tests.tests.main(tests.java:27)

关于如何解决这个问题有什么想法吗？

Answer 1

在从下一行读取之前，您必须先读取行尾字符:

    int size = file.nextInt();
    file.nextLine(); // added
    System.out.println("Size: " + size);

    boolean[][] matrix = new boolean[size][size];
    for (int i = 0; i < size; i++) {
        for (int j = 0; j < size; j++) {
            matrix[i][j] = file.nextBoolean();
        }
        file.nextLine(); // added
    }