I would like to use a multidimensional array to store a grid of data. However, I have not found a simple way to find the length of the 2nd part of the array. For example:
boolean[][] array = new boolean[3][5];
System.out.println(array.length);
will only output 3.
Is there another simple command to find the length of the second array? (i.e. output 5 in the same manner)
Try using array[0].length, this will give the dimension you're looking for (since your array is not jagged).
boolean[][] array = new boolean[3][5];
Creates an array of three arrays (5 booleans each). In Java multidimensional arrays are just arrays of arrays:
array.length
gives you the length of the "outer" array (3 in this case).
array[0].length
gives you the length of the first "inner" array (5 in this case).
array[1].length
and
array[2].length
will also give you 5, since in this case, all three "inner" arrays, array[0], array[1], and array[2] are all the same length.
array[0].length would give you 5
int a = array.length;
if (a > 0) {
int b = array[a - 1].length;
}
should do the trick, in your case a would be 3, b 5
IndexOutOfBounds exception.ArrayIndexOutOfBoundsException since a is the length of array. You probably just meant to use 0
new boolean[0][5] does.new boolean[0] works, array [0] is out of bounds.You want to get the length of the inner array in a 3 dimensional array
e.g.
int ia[][][] = new ia [4][3][5];
System.out.print(ia.length);//prints 4
System.out.print(ia[0].length);//prints 3
System.out.print(ia[0].[0].length); // prints 5 the inner array in a three D array
By induction: For a four dimensional array it's:
ia[0].[0].[0].length
......
System.out.println(array[0].length);