What am I msising?

To be truthful, this is an assignment for my class that has just ended. I turned it in thinking that I had finished it. I was suppose to do the three methods at the bottom of the code and I did and I believe its correct but my professor gave me my grade saying that it didnt compile and I dont know why. Can someone help?

Code :

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import java.util.Scanner;
 import java.util.Random;
 
 
 public class user_Life
 {
 
    // the size of the grid (GRIDSIZE x GRIDSIZE)
    final private static int GRIDSIZE = 18;
 
    /********************************************************************************/
    public static void main ( String args[] )
    {
        boolean[][] board = new boolean[GRIDSIZE][GRIDSIZE];
        char choice;
        int x = 1;
        Scanner sc = new Scanner ( System.in );
 
        do
        {
            System.out.print ( "Start with a (r)andom board, the (q)ueen bee shuttle or the (g)lider pattern? ");
            choice = sc.next().charAt(0);
        } while ( choice != 'r' && choice != 'q' && choice != 'g' );
 
        clearGrid (board);
        setup(board,choice);
 
        do
        {
            System.out.printf ("Viewing generation #%d:\n\n", x++);
            displayGrid(board);
            genNextGrid(board);
            System.out.print ("\n(q)uit or any other key + ENTER to continue: ");
            choice = sc.next().charAt(0);
        } while ( choice != 'q' );
 
    }
 
    /********************************************************************************/
    public static void setup (boolean[][] board, char which )
    {
        Random randomNumbers = new Random();
 
        clearGrid(board);
 
        if ( which == 'q' )
        {
            // Set up the Queen Bee Shuttle pattern
            board[5][1] = true;board[5][2] = true;board[6][3] = true;board[7][4] = true;
            board[8][4] = true;board[9][4] = true;board[10][3] = true;board[11][2] = true;
            board[11][1] = true;
        }
 
        else if ( which == 'g' )
        {
            // Set up a Glider
            board [17][0] = true; board[16][1] = true; board[15][1] = true;
            board[16][2] = true;
            board [17][2] = true;
        }
        else
        {
            // set up random
            for (int row = 0; row < board.length; row++ )
            {
                for (int col = 0; col < board[row].length; col++ )
                {
                    if ( randomNumbers.nextInt() % 2 == 0 )
                        board[row][col] = true;
                }
            }
        }
 
    }
 
    /********************************************************************************/
    public static void displayGrid (boolean[][] grid)
    {
        // Start printing the top row of numbers
        System.out.print ("   ");
        for (int x = 1; x <= grid.length; x++)
        {
            if ((x / 10) != 0)
                System.out.printf ( "%d", x / 10 );
            else
                System.out.print ( " " );
        }
 
        System.out.println();
        System.out.print( "   " );
 
        for (int x = 1; x <= grid.length; x++)
        {
            System.out.printf ( "%d", x % 10 );
        }
        System.out.println();
 
        for (int r = 0; r < grid.length; r++)
        {
            System.out.printf ( "%d", r+1 );
            if (r + 1 < 10)
                System.out.print ( "  " );
            else
                System.out.print ( " " );
            for (int c = 0; c < grid.length; c++)
            {
                if (grid[r][c] == true)
 
               System.out.print ( "*" );
                else
                    System.out.print ( " " );
            }
            System.out.println();
        }
    }
 
 
    /*******************************************************************************/
 
    // put the three methods you must write here and make sure to document
    // them!
 
    public static void clearGrid ( boolean[][] board )
    {
       int col=0;
       for (int row = 0; row <=18; row++)
               {
               while(col<18)
               {
                       board [row][col] = false ;
                       col++;
               }
               }
 
    }
 
 public static void genNextGrid ( boolean[][] board )
 {
       boolean[][] temp = new boolean[GRIDSIZE][GRIDSIZE];
       for (int row=0; row<GRIDSIZE; row++)//start of row
       {
               for (int col=0; col<GRIDSIZE; col++)
               {
                       temp[row][col]=board[row][col];
                       int count = countNeighbors ( temp , row, col );
                       switch (count)
                       {//start of count switch
                       case 0: case 1:
                               temp[row][col]=false;
                               break;
                       case 2:
                               if(temp[row][col])
                                       temp[row][col]=true;
                               if(!temp[row][col])
                                       temp[row][col]=false;
                               break;
                       case 3:
                               temp[row][col]=true;
                               break;
                       case 4: case 5: case 6: case 7: case 8:
                               temp[row][col]=false;
                               break;
                       }//end of switch statement
                       board [row][col]=temp[row][col];
                       displayGrid(board);
               }//end of for row
       }
 }
 
 public static int countNeighbors ( final boolean[][] board, final int row, final int col )
 {
       int ncount = 0;
               for(int r = row-1; r <= row+1; r++)
               {
                       if(row < 0 || row >= GRIDSIZE )
                       {
                               continue;
                       }
                       for(int c = col - 1; c <= col + 1; c++)
               {
                       if(col < 0 || col >= GRIDSIZE || (r == row && c == col))
                       {
                               continue;
                       }
                       if(board[row][col])
                       {
                       ncount++;
                       }
               }
               }
               return ncount;
       }
 
    }
 }

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Your professor should be able to answer exactly why. Just glancing at the code the description says to be sure to document the methods...and there doesn't seem to be any documentation. The syntax is usually above the method and using format the javadoc tool understands.

Code :

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/**
*This is how you document a method. This documents and explains the method below, which 
* is some pathetic excuse for a method that doesn't really do much except return true for any 
* value of x.
*@param x A valid integer
* @return a boolean value - always true
*/
public boolean myMethod(int x){
return true;
}

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