# Two-dimensional arrays

In this section, you will learn about two-dimensional arrays with an example.` ### Two-dimensional arrays

In this section, you will learn about two-dimensional arrays with an example.` # Two-Dimensional Arrays

Two-dimensional arrays are defined as "an array of arrays". Since an array type is a first-class Java type, we can have an array of ints, an array of Strings, or an array of Objects. For example, an array of ints will have the type int[]. Similarly we can have int[][], which represents an "array of arrays of  ints". Such an array is said to be a two-dimensional array.
The command

int[][] A = new int;

declares a variable, A, of type int[][], and it initializes that variable to refer to a newly created object. That object is an array of arrays of ints. Here, the notation int indicates that there are 3 arrays of ints in the array A, and that there are 4 ints in each of those arrays.
To process a two-dimensional array, we use nested for loops. We already know about for loop. A loop in a loop is called a Nested loop. That means we can run another loop in a loop.

Notice in the following example how the rows are handled as separate objects.

 ```Code: Java int[][] a2 = new int; // print array in rectangular form for (int i=0; i

In this example, "int[][] a2 = new int;" notation shows a two-dimensional array. It declares a variable a2 of type int[][],and it initializes that variable to refer to a newly created object. The notation int indicates that there are 10 arrays of ints in the array a2, and that there are 5 ints in each of those arrays.

Here is the complete code of the example:

 ``` public class twoDimension{   public static void main(String[] args) {   int[][] a2 = new int;   for (int i=0; i

Here is the output for the program:

 `C:\tamana>javac twoDimension.java` ```C:\tamana>java twoDimension 0 0 0 0 0 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 4 4 4 4 4 5 5 5 5 5 6 6 6 6 6 7 7 7 7 7 8 8 8 8 8 9 9 9 9 9``` `C:\tamana>_`