Need help implementing the following Java code package mini2; import api.ITransf

Question

Need help implementing the following Java code

package mini2;

import api.ITransform;

/**
* Transformation implementing Conway's Game of Life.
* All cells have value 0 or 1. The new value is based on the center
* cell along with the sum S of its eight neighbors, according to
* the rules:
* <ul>
* <li>if S is less than 2 the result is 0
* <li>if S is greater than 3 the result is 0
* <li>if the center cell is 1 and S is 2 or 3, the result is 1
* <li>if the center cell is 0 and S is exactly 3, the result is 1
* </ul>
* See
* http://en.wikipedia.org/wiki/Conway%27s_Game_of_Life
*
* <p>
* The radius is 1 and the <code>isWrapped()</code> method
* always returns true.
*/
public class ConwayTransform implements ITransform
{

@Override
public int apply(int[][] elements)
{
// TODO
return 0;
}

@Override
public int getRadius()
{
return 1;
}

@Override
public boolean isWrapped()
{
return true;
}
  
}

Explanation / Answer

public class ConwayTransform implements ITransform {

   @Override
   public int apply(int[][] elements) {
       if (elements.length != 2 * getRadius() + 1 || elements[0].length != 2 * getRadius() + 1) {
           throw new IllegalArgumentException();  
       }
       int sum = 0;
       int centerCellValue = elements[(elements.length - 1) / 2][(elements[0].length - 1) / 2];
       for (int row = 0; row < elements.length; row++) {
           for (int col = 0; col < elements[0].length; col++) {
               if (!(row == (elements.length - 1) / 2 && col == (elements[0].length - 1) / 2)) {
                   sum += elements[row][col];
               }
           }
       }
       if (sum < 2 || sum > 3) {
           return 0;
       } else {
           if (centerCellValue == 1) {
               return 1;
           } else if (centerCellValue == 0 && sum == 3) {
               return 1;
           } else {
               return 0;
           }
       }
   }

   @Override
   public int getRadius() {
       return 1;
   }

   @Override
   public boolean isWrapped() {
       return true;
   }

}

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