来自文件的 Java 迷宫



我从一个文件中得到了一个迷宫,我试图使这个 编写一个类 Exercise4 与一个程序将这样的迷宫文件读取到二维布尔数组中。然后在控制台上显示数组,每行一行。使用空白符号和 # 符号表示数组元素,以便控制台输出具有与迷宫文件相同的格式,请参阅上面的示例。

    package assignmentce152;

    import java.io.BufferedReader;
    import java.io.File;
    import java.io.FileReader;
    import java.io.IOException;
    import java.util.Scanner;
    import java.io.FileNotFoundException;
/**
 * Created by ak on 29/03/2017.
 */
public class Exercise4 {
    public static void main(String[] args) throws IOException {
        Mazes();
    }
        private static char[][] maze = null;
        private static int rows = 0;
        private static int cols = 0;
        private static int xStart = 0;
        private static int yStart = 0;
        public static void Mazes() throws IOException {
            File mazefile = new File("C:/Users/IdeaProjects/Assignment152/data/maze21.txt");
            BufferedReader reader = new BufferedReader(new FileReader(mazefile));
           Scanner lineOfFile = new Scanner(reader.readLine()); 
            rows = lineOfFile.nextInt(); //get the number of rows of the maze
            cols = lineOfFile.nextInt(); // get the number of columns of the maze
            maze = new char[rows][cols]; //create a char array of the proper size
            //For loops to iterate the rows and col to find the start/enterance of the maze as it pertains to the first char in the row
            for (int y = 0; y < cols; y++) {
                lineOfFile = new Scanner(reader.readLine());
                for (int x = 0; x < rows; x++) {
                    char start = lineOfFile.next().charAt(0);
                    maze[x][y] = start;
                    //statement to set the starting coorinates for the maze
                    if (start == '.') {
                        xStart = x;
                        yStart = y;
                    }
                }
            }

        }
    }

怎么会有这些错误,我应该改变什么?任何我认为会有所帮助的事情

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.nextInt(Scanner.java:2117)
at java.util.Scanner.nextInt(Scanner.java:2076)
at assignmentce152.Exercise4.Mazes(Exercise4.java:28)
at assignmentce152.Exercise4.main(Exercise4.java:14)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at  sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

似乎您的程序尝试从扫描仪读取两个整数,但在那里找不到两个整数。

让我猜猜:以下行是错误的。

       Scanner lineOfFile = new Scanner(reader.readLine()); 

readLine()读取文件的第一行。从此行创建可用于分析该行的扫描程序对象。例如,如果您的两个数字位于文件的前行,则永远不会同时到达它们,并且会抛出InputMismatchException

相反,您可以尝试丢弃reader,而只是将扫描仪创建为

       Scanner lineOfFile = new Scanner(mazefile); 

这将允许扫描仪读取整个文本文件,而不仅仅是第一行。

如果这不能解决您的问题,我相信您需要编辑您的问题并添加文件外观的示例。

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