looping through multidimensional array

Hi Gabriel,

This is a trick to get the length of an array, be it an array of primitives or an array of objects. This allows to write a method that operates on both array types.

For example here is a method that prints the content of any type of array:

void print(Object array) { for (int i = 0; i < Array.getLength(array); i++) { System.out.println(Array.get(array, i)); } } This will work with int[] or Object[] parameters.

Otherwise you should just use the .length static field.

The length property works just fine on multidimensional arrays. You just have to remember that a multidimensional array is an array of arrays (of arrays...) so array.length is the length of the first dimension. If you want the second dimension you need the length of that row in the array.

int[][] array = { { 1, 2, 3 }, 
                  { 4, 5, 6 }, 
                  { 7, 8, 9 } };
for( int i=0; i < array.length ; i++) {
    for (int j=0; j < array[i].length ; j++) {
        System.out.printf(array[i][j] + " ");
    }
    System.out.printf("\n");
}