# pattern generation

khimanichirag
pattern generation
1 Answer(s)      5 years and a month ago
Posted in : Java Interview Questions

write a program to print pattern shown below

1 2 3 4 5 16 17 18 19 6 15 24 25 20 7 14 23 22 21 8 13 12 11 10 9

August 7, 2012 at 4:09 PM

Here is an example of number spiral.

```public class NumberSpiral{

public static void main(String[] args) {
int dimension=5;
int[][] spiralArray = new int[dimension][dimension];
int num = (int) Math.ceil((dimension) / 2.0);

int j;
int len = dimension;
int number = 1;

for (int i = 0; i < num; i++) {
for (j = 0; j < len; j++) {
spiralArray[i][i + j] = number++;
}
for (j = 1; j < len; j++) {
spiralArray[i + j][dimension - 1 - i] = number++;
}
for (j = len - 2; j > -1; j--) {
spiralArray[dimension - 1 - i][i + j] = number++;
}
for (j = len - 2; j > 0; j--) {
spiralArray[i + j][i] = number++;
}
len -= 2;
}
for (int[] row : spiralArray) {
for (int elem : row) {
System.out.printf("%3d", elem);
}
System.out.println();
}
}

}
```

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