[Solved] How to read two matrices from a txt file in java

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You have to:

  • read first line

  • split it to get dimensions

  • read next lines (regards dimensions)

  • read special char (@)

  • repeat

Reading first array you have there:

static void readFile() throws IOException {
    BufferedReader reader;
    reader = new BufferedReader(new FileReader("file.txt"));

    String firstDimension = reader.readLine();
    String[] split = firstDimension.split(" ");
    int firstX = Integer.parseInt(split[0]);
    int firstY = Integer.parseInt(split[0]);

    int[][] first = new int[firstX][firstY];

    for (int i = 0; i < firstX; i++) {
        String[] line = reader.readLine().split(" ");

        for (int j = 0; j < firstY; j++) {
            first[i][j] = Integer.parseInt(line[j]);
        }

    }

    // Read "@"
    reader.readLine();

    System.out.println(Arrays.deepToString(first));


}

and base on input:

3 3
12 34 45
34 -12 56
76 12 -1
@
3 3
8 13 45
67 0 12
12 -12 3

output should be:

[[12, 34, 45], [34, -12, 56], [76, 12, -1]]

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solved How to read two matrices from a txt file in java