## Multi-Dimensional Array in Java:

We can use the Eclipse IDE for this example. If you do not know about it then follow this link- .How to Install Eclipse For Java and create a program in it |

Multi-Dimensional Arrays represent 2D, 3D, …… arrays that are combinations of several types of arrays. For example, a 2D array is a combination of two or more 1D arrays. Similarly, a 3D array is a combination of two or more 2D arrays. In this blog, we will learn about 2D arrays.

*Two-Dimensional Arrays (2D arrays):*

A 2D array represents several rows and columns of data. For example, the marks obtained by a group of students in three different subjects can be represented by a 2D array. If we write the marks of three students as:

- 40, 50, 55
- 35, 69, 30
- 40, 70, 80

The preceding marks represent a two-dimensional array since it got three rows (number of students) and in each row three columns (number of subjects). There are totally (3 x 3 = 9) elements. We can take the first row itself as a one-dimensional array. Similarly, the second row is a one-dimensional array and the third row is another one-dimensional array. So the preceding 2D array contains three 1D arrays within it.

*Source Code:*

```
public class Two_dimensional_array {
public static void main(String[] args) {
// TODO Auto-generated method stub
int[][] students_marks = new int[3][3];
students_marks[0][0] = 40;
students_marks[0][1] = 50;
students_marks[0][2] = 55;
students_marks[1][0] = 35;
students_marks[1][1] = 69;
students_marks[1][2] = 30;
students_marks[2][0] = 40;
students_marks[2][1] = 70;
students_marks[2][2] = 80;
for(int x=0; x<students_marks.length; x++) {
System.out.println();
for(int y=0; y<students_marks[x].length; y++) {
System.out.print(students_marks[x][y] + " ");
}
}
}
}
```

*Another way to write the above code:*

```
public class Two_dimensional_array {
public static void main(String[] args) {
// TODO Auto-generated method stub
int[][] students_marks = { {40,50,55},
{35,69,30},
{40,70,80} };
students_marks[0][0] = 40;
students_marks[0][1] = 50;
students_marks[0][2] = 55;
students_marks[1][0] = 35;
students_marks[1][1] = 69;
students_marks[1][2] = 30;
students_marks[2][0] = 40;
students_marks[2][1] = 70;
students_marks[2][2] = 80;
for(int x=0; x<students_marks.length; x++) {
System.out.println();
for(int y=0; y<students_marks[x].length; y++) {
System.out.print(students_marks[x][y] + " ");
}
}
}
}
```

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