Java - 使用扫描仪从文本文件读取到2D字符数组中

时间:2012-03-07 17:08:15

标签: java arrays java.util.scanner

我正在尝试将文本文件读入30x30字符数组。扫描仪没有nextChar方法,所以我假设我要使用next()然后将该行拆分为chars?我忙着使用3 for循环来做到这一点,一个用于String,一个用于行,一个用于列。

到目前为止,这是我的代码..

public static void main(String[] args) throws FileNotFoundException {
    final int cellSize = 30; // grid size
    char[][] chargrid = new char[cellSize][cellSize];
    File inputFile = new File("E:\\workspace\\Life2\\bin\\Sample input.txt");
    Scanner in = new Scanner(inputFile);

    char testchar;
    while(in.hasNext()){
    String s = in.next();
    for (int i=0; i<s.length();i++){
     testchar = s.charAt(i);

现在我会为数组行和放大器执行2 for语句列然后设置chargrid [i] [j] = testchar例如?

任何帮助都将不胜感激。

1 个答案:

答案 0 :(得分:0)

据我在你的评论中看到,如果字符是'X',你想要一个带有布尔值的2D数组,所以我在我的代码中填充了两个数组 - 一个实际上是字符,一个是真或假,取决于角色是否为“X”。还有一些system.outs可以更好地理解它是如何工作的。我在出现时删除换行符('\ n')(不知道你是否想要)

public static void main(String[] args) {
    final int cellSize = 30; // grid size
    char[][] chargrid = new char[cellSize][cellSize];
    boolean[][] chargridIsX = new boolean[cellSize][cellSize];
    File inputFile = new File("input.txt");
    FileInputStream is = null;
    try {
        is = new FileInputStream(inputFile);
        int n = -1;
        int rowCount = 0;
        int colCount = 0;
        while( (n=is.read()) !=-1){
            char readChar = (char) n;
            if(readChar!='\n'){//This removes the linebreaks - dont know if you want that
                chargrid[rowCount][colCount] = readChar;
                if(readChar=='X') { // Here actually set true or false if character is 'X'
                    chargridIsX[rowCount][colCount] = true;
                    System.out.println("row "+rowCount+" col "+colCount + " = " + readChar + " " + true);
                }else {
                    chargridIsX[rowCount][colCount] = false;
                    System.out.println("row "+rowCount+" col "+colCount + " = " + readChar+ " " + false);
                }
                if(rowCount++ >= cellSize-1){
                    System.out.println("new col");
                    rowCount = 0;
                    if(colCount++ >= cellSize-1){
                        //ARRAY IS FULL
                        System.out.println("full");
                        break;
                    }
                }
            }
        }

    } catch (FileNotFoundException e) {
        //could not get Inputstream from file
        e.printStackTrace();
    } catch (IOException e) {
        // problem with the inputstream while reading
        e.printStackTrace();
    }

顺便说一句。我正在从输入流中读取字符而不是使用扫描仪,希望这没关系 - 否则请告诉我

对于什么这可能是好的