Write a program in java to demonstrate the addition of two matrix
```java
public class MatrixAddition {
public static void main(String[] args) {
int[][] matrix1 = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
int[][] matrix2 = {{9, 8, 7}, {6, 5, 4}, {3, 2, 1}};
int rows = matrix1.length;
int cols = matrix1[0].length;
int[][] result = new int[rows][cols];
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
result[i][j] = matrix1[i][j] + matrix2[i][j];
}
}
// Displaying the result matrix
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
System.out.print(result[i][j] + " ");
}
System.out.println();
}
}
}
```
This program demonstrates the addition of two matrices `matrix1` and `matrix2`. The result of the addition is stored in the `result` matrix and then displayed.