Java俄罗斯方块游戏：无法将网格移动到网格中

Question

我用Java制作俄罗斯方块。一旦删除了一行（因为它已填满），我很难让我的块向下移动。我的代码抛出了一个arrayIndexOutOfBounds错误。其余的代码工作，它找到哪一行已满并将该行设置为0.但在底部附近的if语句中，它不起作用。谢谢 ！ ：）

// Removes any rows that are filled 
public static int removeRows() 
{
    // Variables
    int numOfRows = tetrisGrid.getNumOfRows(); 
    int numOfCols = tetrisGrid.getNumOfCols();
    int numRowsRemoved = 0;
    int [][] grid = tetrisGrid.getGrid();

    // Finds the number of rows that are filled 
    for (int row = 0; row < numOfRows; row++)
    {
      for (int col = 0; col < numOfCols; col++)
      {
        int blockValue = tetrisGrid.getBlockValue(row, col);

        if (blockValue == 0) 
        {
          break;
        }

        if (col == numOfCols - 1) 
        {
          numRowsRemoved++;

          // Sets the rows filled to zero
          for (int change = 0; change < numOfCols; change++)
          {
            grid [row][change] = 0; 
          }   

          // Shifts everything down until it hits blocks below
          for (int shiftRow = 0; shiftRow < 2; shiftRow++)
          {
            for (int shiftCol = 0; shiftCol < numOfCols; shiftCol++)
            {
              if (blockValue == 1)
              {
                grid [row][col] = 0;
                row++;
                col++;
                grid [row][col] = 1;   
                row--;
                col--; 
              }
              else if (blockValue == 0)
                break;

            }
          }

          // TAKE OUT -------------------------
          System.out.println ("--------"); 
          tetrisGrid.printGrid(); 
          System.out.println ("--------");
          // -------------------------
        } 
      }
    }  
    tetrisGrid.setGrid(grid);
    return numRowsRemoved; 
  }