Question

I have problem with conversion from String into two dimension int array.
Let’s say I have:

String x = "1,2,3;4,5,6;7,8,9"

(In my program it will be String from text area.) and I want to create array n x n

int[3][3] y = {{1,2,3},{4,5,6},{7,8,9}} 

(Necessary for next stages.) I try to split the string and create 1 dimensional array, but I don’t have any good idea what to do next.

---

As you suggest I try split at first using ; then , but my solution isn’t great. It works only when there will be 3 x 3 table. How to create a loop making String arrays?

public int[][] RunMSTFromTextFile(JTextArea ta)
    {
        String p = ta.getText();
        String[] tp = p.split(";");

        String tpA[] = tp[0].split(",");
        String tpB[] = tp[1].split(",");
        String tpC[] = tp[2].split(",");

        String tpD[][] = {tpA, tpB, tpC};

        int matrix[][] = new int[tpD.length][tpD.length];

        for(int i=0;i<tpD.length;i++)
        {
            for(int j=0;j<tpD.length;j++)
            {
                matrix[i][j] = Integer.parseInt(tpD[i][j]);
            }
        }
        return matrix;
    }

Answer 1

After using split, take a look at Integer.parseInt() to get the numbers out.

String lines[] = input.split(";");
int width = lines.length;
String cells[] = lines[0].split(",");
int height = cells.length;
int output[][] = new int[width][height];

for (int i=0; i<width; i++) {
    String cells[] = lines[i].split(",");
    for(int j=0; j<height; j++) {
        output[i][j] = Integer.parseInt(cells[j]);
    }
}

Then you need to decide what to do with NumberFormatExceptions