2D Arrays

Complete this code for a 2D array: int[][] temps = ___ int[5][2];

Complete this for loop code to loop until the end of an array called "grades":

for(int row = 0; row < ___ ; row++) ...

What is missing below order to declare the array as a 3D array:

int[][]___ multiArray;

In 2D arrays, each row must be the same length (e.g. 2D arrays cannot be ragged/jagged).

• True

• False

Answer explanation

In a 2D array, each row contains an array that consists of the columns. There is nothing stopping a 2D array from having rows of different sizes.

What value prints below?

int[][] vals = { { 1, 2 }, { 3, 4 } };

 

        System.out.println(vals[0][1]);

• 1

• 2

• 3

• 4

Answer explanation

The first subscript value (0) means "first row".

The second subscript value (1) means "second column" of that row.

Don't forget that index values start at 0.