Question

I try to make a multidimensional array with methods. But i stuck in here; my print method not working properly. It shows nothing and no errors.

public void bas() { // ========> print method
for (int a = 0; a < dizi.length; a++) {
    for (int b = 0; b < dizi[a].length; b++) {
        System.out.println(" dizi[" + n + "][" + m + "] = "
        + dizi[n][m]);
    }}}

---

it fixed.

public int[][] doldur() { // ========> fill method
for (int i = 0; i < dizi.length; i++) {
    for (int j = 0; j < dizi.length[i]; j++) { //problem in here: The type of the expression must be an array type but it resolved to int

    }
}
return dizi;

}

dizi.length[i] => dizi[i].length

---

rest of my code:

public class ikiBoyutluDizi {
int n, m;
int[][] dizi = new int[n][m];

public int[][] diziBoyutu(int a, int b) {
    return dizi;
}

public int[][] doldur() { // ========> fill method
    for (int i = 0; i < dizi.length; i++) {
        for (int j = 0; j < dizi.length[i]; j++) {

        }
    }
    return dizi;
}

public void bas() { // ========> print method
    for (int a = 0; a < dizi.length; a++) {

        for (int b = 0; b < dizi[a].length; b++) {

            System.out.println(" dizi[" + n + "][" + m + "] = "

            + dizi[n][m]);

        }
    }
}

public static void main(String[] args) {
    ikiBoyutluDizi dizi2x = new ikiBoyutluDizi();
    dizi2x.diziBoyutu(2, 3);
    dizi2x.doldur();
    dizi2x.bas();
}

}

One more thing; can you check my print method? Do you think is it working properly after fix the fill method?

Answer 1

In the problematic line – you should use dizi[i].length instead of dizi.length[i].

The reason is dizi is of type int[][] and thus dizi[i] is of type int[] – which is an array, but dizi.length is an int, and you actually tried to access an element in an int – which is impossible!

You might also want to make sure dizi[i] != null before doing so

public int[][] doldur() { // ========> fill method
for (int i = 0; i < dizi.length; i++) {
    for (int j = 0; dizi[i] != null && j < dizi[i].length; j++) { 
      //               ^                         ^
      //           not null                   dizi[i].length 
      //                                         instead of
      //                                      dizi.length[i]
      // Do domething

    }
}