大家帮我看一下这个这个程序 为什么不安我的意愿运行呢

public class SimpleDotComTestDrive {
    private static String guess;
      int numofGuesses = 0;
      GameHelper helper = new GameHelper();
    ArrayList<SimpleDotCom>  dotComsList = new ArrayList<SimpleDotCom>();
        private void setupGame()
                {
                SimpleDotCom dot1 =new SimpleDotCom();
                SimpleDotCom dot2 =new SimpleDotCom();
                SimpleDotCom dot3 =new SimpleDotCom();
                dot1.setName( "Go2.com");
                dot2.setName("Pets.com");
                dot3.setName("AskMe.com");
                        System.out.println("your goal id to sink three dot coms");
                        System.out.println("Pets.com,AskMe.com,Go2.com");
                        System.out.println("Try to sink them all in the fewest number of guessses");
                        for(SimpleDotCom dotComToSet:dotComsList)
                        {
                            ArrayList<String> newLocation = helper.placeDotcom(3);
                            dotComToSet.setLocationCells(newLocation);
                        }
        }
           public void startPlaying()
    {
                while(!dotComsList.isEmpty())
                {
                  String userGuess = helper.getUserInput("enter a guess:");
                  checkUserGuess(userGuess);
                }
                finishGame();
                }
               private void checkUserGuess(String userGuess)
               {
                    numofGuesses++;
                    String result ="miss";
                    for(SimpleDotCom dotComToTest : dotComsList)
                    {
                        result = dotComToTest.checkYourself(userGuess);
                        if(result.equals("hit"))
                        {
                            break;
                        }
                        if(result.equals("kill"))
                        {
                            dotComsList.remove(dotComToTest);
                            break;
                        }
                    }
                    System.out.println(result);
                }
                void finishGame()
                  {
                    System.out.println("game over !!");
                    if(numofGuesses<10)
                    {
                        System.out.println("a congratulations message");
                        
                    }
                    else
                    {
                        System.out.println("be perfect next time!!");
                    }
                }
              
public static void main(String[] args)
        {
    SimpleDotComTestDrive game =new SimpleDotComTestDrive();
        game.setupGame();
        game.startPlaying();
}
}
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */package SimpleDotComTestDrive;import java.util.ArrayList;/**
 *
 * @author 诸葛一帆
 */
public class SimpleDotCom {
        private ArrayList<String> locationCells;
        private String name;
        public void setLocationCells(ArrayList<String> locs)
        {
            locationCells = locs;
        }
             public void setName(String n) {
                 name = n;
                    }
  public  String checkYourself(String userInput) {
      String result="miss";
      int index = locationCells.indexOf(userInput);
      if(index>=0)
      {
          locationCells.remove(index);          if(locationCells.isEmpty())
          {
              result = "kill";
              System.out.println("Ouch! you sunk"+name+"  :( ");
          }
          else
              result ="hit";
      }
      return result;
    }
}
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */package SimpleDotComTestDrive;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;/**
 *
 * @author 诸葛一帆
 */
public class GameHelper {
    private static final String alphabet ="abcdefg";
    private int gridLength =7;
    private int gridSize = 49;
    private int [] grid = new int[gridSize];
    private int comCount = 0;   public String getUserInput(String prompt) {
        String inputLine = null;
        System.out.print(prompt+" ");
        try
        {
            BufferedReader is =new BufferedReader(
                    new InputStreamReader(System.in));
            inputLine = is.readLine();
            if(inputLine.length()==0)
                return null;
        }
        catch(IOException e)
        {
            System.out.println("IOException: "+e);
        }
        return inputLine.toLowerCase();
    }    public  ArrayList<String>  placeDotcom(int comSize) {
        ArrayList<String> alphaCells = new ArrayList<String>();
        String [] alphacoords = new String[comSize];
        String temp = null;
        int [] coords = new int[comSize];
        int attempts=0;
        boolean success = false;
        int location =0;
        comCount++;
        int incr = 1;
        if((comCount % 2)==1)
        {
            incr = gridLength;
        }
        while( !success & attempts++ < 200)
        {
            location =(int)(Math.random()*gridSize);
            int x = 0;
            success = true;
            while(success && x < comSize)
            {
                if(grid[location]==0)
                {
                    coords[x++]=location;
                    location += incr;
                    if(location >= gridSize)
                    {
                        success = false;
                    }
                    if(x>0 && (location % gridLength==0))
                    {
                        success = false;
                    }
                    else
                    {
                        success = false;
                    }
                }
            }            int y = 0;
            int row =0;
            int column = 0;
            while(y<comSize)
            {
                grid[coords[y]] = 1;
                row = (int)(coords[y] / gridLength);
                column = coords[y] % gridLength;
                temp = String.valueOf(alphabet.charAt(column));
                alphaCells.add(temp.concat(Integer.toString(row)));
                y++;
            }        }
            return alphaCells;
     
    }
}