This is a brief tutorial on how to do jagged arrays in Java.

Most of the time, when we thing of arrays, we think of  M*N rectangular arrays, where M represents the rows and N represents the columns. These type of arrays are easy to create in Java:

public class arrayExample1 {
    public static void main(String[] args) {
        //Array is declared and initialized.
        int[][] array = new int[10][5];
        //Fill the array
        for (int i = 0; i<10; i++) {
            for (int j = 0; j<5; j++) {
                array[i][j] = j;
            }
        }
        //Test the array
        for (int i = 0; i<10; i++) {
            for (int j = 0; j<5; j++) {
                System.out.print(array[i][j]+" ");
            }
            System.out.println();
        }
    }
}

The output would be something like this:

0 1 2 3 4
0 1 2 3 4
0 1 2 3 4
0 1 2 3 4
0 1 2 3 4
0 1 2 3 4
0 1 2 3 4
0 1 2 3 4
0 1 2 3 4
0 1 2 3 4

But Rommel Rico can also create jagged arrays in Java! That is, we can create two-dimensional arrays that have M rows but each row has X columns. 'Whaaat!?', you say. Look:

public class arrayExample2 {
    public static void main(String[] args) {
        //Declare, Initialize, and fill the array
        int[][] array = {{0,1,2,3,4},
                         {0,1,2},
                         {0,1,2,3},
                         {0,1},
                         {0},
                         {0},
                         {0,1,2,3,4,5},
                         {0},
                         {0,1,2,3},
                         {0,1,2,3}};

        //Test the array
        for (int i = 0; i

0 1 2 3 4
0 1 2
0 1 2 3
0 1
0
0
0 1 2 3 4 5
0
0 1 2 3
0 1 2 3