如何将数据从txt文件存储到2d数组java

Question

并将其存储到int 2d数组roomLayout = new int[numberOfRooms//=5][Arr.length];

这是我现在得到的

str = gamemap.readLine();
String[] strArr = str.split(",");
System.out.println(str);
roomLayout = new int[numberOfRooms][str.length];
for (String number : strArr)
{
    int strToInt = Integer.parseInt(number);
    System.out.print(number);
}

Answer 1

public static void main(String[] args) throws FileNotFoundException, IOException {
    // all lines in file
    ArrayList<String> lines = new ArrayList();
    BufferedReader in = new BufferedReader(new FileReader("map.txt"));
    String line;
    // read lines in file
    while ((line = in.readLine())!=null){
        lines.add(line);
    }
    in.close();
    // create new 2d array
    int[][] map = new int[lines.size()][];
    // loop through array for each line
    for (int q = 0; q < map.length; q++){
        // get the rooms by separating by ","
        String[] rooms = lines.get(q).split(",");
        // size 2d array
        map[q] = new int[rooms.length];
        // loop through and add to array's second dimension
        for (int w = 0; w < rooms.length; w++){
            map[q][w] = Integer.parseInt(rooms[w]);
        }
        System.out.println(Arrays.toString(map[q]));
    }
}

输出如下:

[2]
[1, 3, 5]
[2, 5]
[3, 4, 2]
[5]

Answer 2

您可以继续使用以下方法。

String yourString="2n1,3,5n2,5n3,4,2n5";    //Added newline characters for each newline
String lines[]=yourString.split("n");
int roomLayout[][]=new int[lines.length][];
// for each line, split them and store them in your 2d array
for(int i=0;i<lines.length;i++){
    String parts[]=lines[i].split(",");
    int[] numbers=new int[parts.length];
    for(int j=0;j<parts.length;j++){
        numbers[j]=Integer.parseInt(parts[j]);
    }
    // assign your row as a row in the roomLayout.
    roomLayout[i]=numbers;
}
// Whenever you access the array, that is i'th room (indexed from 0)
// access allowed rooms as
for(int x=0;x<rooLayout[i].length;x++){
    System.out.println(roomLayout[i][x]);
}

否则你可以选择ArrayLists，这在你的情况下是一个很好的选择。

Answer 3

如果您对使用Java 8没有异议，您可以采用以下更简单的方法:

public static int[][] readRoomLayout(String fileName) throws IOException {
    int[][] roomLayout = null;
    Path filePath = Paths.get(fileName);
    Function<String, int[]> toIntArrayFunction = string -> {
        String[] splitted = string.split(",");
        return Arrays.stream(splitted).mapToInt(Integer::parseInt).toArray();
    };
    List<int[]> rooms = Files.lines(filePath).map(toIntArrayFunction)
            .collect(Collectors.toList());
    roomLayout = rooms.toArray(new int[rooms.size()][]);
    return roomLayout;
}