09 May Multidimensional Arrays in Java
In the last lesson, we learned about One-Dimensional Arrays in Java and how to use them. Now, we will see the concept of arrays in Java, i.e., Multidimensional Arrays. Multi-dimensional arrays, as the name suggests, are arrays of arrays. You need to use two square brackets to declare a multidimensional array, unlike a one-dimensional array.
Video Tutorial (English)
Video Tutorial (Hindi)
Let us see an example to declare a 2 by 3 multidimensional array,
int result[][] = new int[2][3];
The following figure displays how a multidimensional array forms a 2×3 matrix,
Above, the left index determines row and the right index determines column.
We will now see how to display each element from our 2×3 matrix,
// Two-Dimensional (2D) Array in Java
class Demo {
public static void main(String[] args) {
int i, j, k = 0;
int[][] result = new int[2][3];
for(i=0; i < 2; i++) {
for(j=0; j < 3; j++) {
result[i][j] = k;
k++;
}
}
for(i=0; i < 2; i++) {
for(j=0; j < 3; j++) {
System.out.print(result[i][j] + " ");
}
System.out.println();
}
}
}
The following is the output displaying each element,
Let us see another example:
// Two-Dimensional (2D) Array in Java
class Demo {
public static void main(String[] args) {
int i, j, k = 0;
int[][] result = new int[3][3];
for(i=0; i < 3; i++) {
for(j=0; j < 3; j++) {
result[i][j] = k;
k++;
}
}
for(i=0; i < 3; i++) {
for(j=0; j < 3; j++) {
System.out.print(result[i][j] + " ");
}
System.out.println();
}
}
}
Output
0 1 2 3 4 5 6 7 8
In this lesson, we saw how to work with Multidimensional arrays in Java.
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