1380. Lucky Numbers in a Matrix

class Solution {
    public List<Integer> luckyNumbers (int[][] matrix) 
    {

        for (int[] row : matrix) 
        {
            int minIndex = getMinIndex(row); //finding the col of the minimum element of thid row

            if(row[minIndex] == maxNumOfColumn(matrix, minIndex)) // checking if this min is also max in its col
            {   
                return List.of(row[minIndex]);

            }

        }
        
        return new ArrayList<>();

        
    }


    public int getMinIndex(int[] row)  // findimg our min col
    {
        int minIndex = 0;
        for(int j = 0; j < row.length; j++)
        {
            if (row[j] < row[minIndex]) minIndex = j;

        }
                
        
        return minIndex;
    
    }

    public int maxNumOfColumn(int[][] matrix, int j) // finding if max in column
    {
        int result = 0;
        for(int i = 0; i < matrix.length; i++)
        {

            result = Math.max(result, matrix[i][j]);

        }
        
        
        return result;
  }








}