Spiral unwinding a matrix interview question solved java source code

To unwind a matrix spirally to an array.

/**
 * Unwinding a matrix in java
 * Tested a 5 x 5 matrix
 */
package com.konzern.solution;

/**
 * @author Arjun Babu
 *
 */
public class Unwinding {

/**
* @param amazon
*/
public static void main(String[] hematcs) {
Unwinding unwindMatrix = new Unwinding();
int[][] matrix = unwindMatrix.getInput();
unwindMatrix.display(matrix);
int[] value = unwindMatrix.unwindMatix(matrix);
}

private void display(int[][] matrix) {
System.out.println("The Input Matrix \n");
int len = matrix.length;
for (int i = 0; i < len; i++) {
for (int j = 0; j < len; j++) {
System.out.print(matrix[i][j] + "\t");
}
System.out.println();
}

}

private int[] unwindMatix(int[][] matrix) {
System.out.println("\nThe Output Array \n");
int len = matrix.length;
int loopCount = len * len;
int data[] = new int[loopCount];
int flag = 0;
int maxRow = len - 1;
int maxCol = len - 1;
int minRow = 0;
int minCol = 0;
int row = 0;
int col = 0;
for (int i = 0; i < loopCount; i++) {
data[i] = matrix[row][col];
System.out.print(data[i] + " ");
switch (flag) {
case 0:
col = col + 1;
if (col > maxCol) {
col = maxCol;
row = row + 1;
minRow++;
flag = 1;
}
break;
case 1:
row = row + 1;
if (row > maxRow) {
row = maxRow;
col--;
maxCol--;
flag = 2;
}
break;
case 2:
col = col - 1;
if (col < minCol) {
row = row - 1;
col = col + 1;
maxRow--;
flag = 3;
}
break;

case 3:
row = row - 1;
if (row < minRow) {
row = row + 1;
col = col + 1;
minCol++;
flag = 0;
}
break;
default:
break;
}
}
return data;
}

private int[][] getInput() {
int matrix[][] = { { 1, 2, 3, 4, 5 }, { 6, 7, 8, 9, 10 }, { 11, 12, 13, 14, 15 }, { 16, 17, 18, 19, 20 }, { 21, 22, 23, 24, 25 } };
return matrix;
}
}

The Input Matrix 

1 2 3 4 5

6 7 8 9 10

11 12 13 14 15

16 17 18 19 20

21 22 23 24 25

The Output Array 

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