This code of mine is not working, Please help.... i am studying from Head first java

[Mike Kris]

1. This works well for me...

 
public class SimpleDotCom {

    int[] locationCells;

    int numOfHits = 0;
    
    public void setlocationCells(int[] locs)

    {

        locationCells = locs;

    }
    
    public String checkYourself(String stringGuess) {

        int guess = Integer.parseInt(stringGuess);

        String result = "miss";

        for (int cell: locationCells)

        {

            if (guess == cell) {

                result = "hit";

                numOfHits++;

                break;

            }

        }

        if (numOfHits == locationCells.length)

        {

            result = "kill";

        }

        System.out.println(result);

        return result;

    }

}
   

2. This works well for me...

  
public class SimpleDotComTestDrive {

	public static void main (String[] args) {

	SimpleDotCom dot = new SimpleDotCom();

	int[] locations = {2,3,4};

	dot.setlocationCells(locations);
	
	String userGuess = "2";

	String result = dot.checkYourself(userGuess);

	}

	}  

3. This works well for me...

import java.io.*;
import java.util.*;

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();
  }
}
    

4. This is giving me an error.....

  

import helpers.GameHelper;
import java.util.*;

public class Game {
    public static void main(String[] args)
    {
        int numOfGuesses = 0;
        GameHelper helper = new GameHelper();
        
        SimpleDotCom theDotCom = new SimpleDotCom();
        int randomNum = (int) (Math.random() * 5);
        
        int[] locations = {randomNum, randomNum+1, randomNum+2};
        theDotCom.setLocationCells(locations);
        boolean isAlive = true;
        while (isAlive == true)
        {
            String guess = helper.getUserInput("enter a number");
            String result = theDotCom.checkYourself(guess);
            numOfGuesses++;
            if (result.equals("kill")) {
                isAlive = false;
                System.out.println("You took " + numOfGuesses + " guesses");
            }
        }
    }
}
  

I get the following error when i compile the Game class

D:\Java>javac Game.java
Game.java:5: package helpers does not exist
import helpers.GameHelper;
^
Game.java:12: cannot access GameHelper
bad class file: .\GameHelper.class
class file contains wrong class: chap05.GameHelper
Please remove or make sure it appears in the correct subdirectory of the classpa
th.
GameHelper helper = new GameHelper();
^
2 errors

Thanks to all in advance,

Mike

[Chiranjeevi Kanthraj]

D:\Java>javac Game.java
Game.java:5: package helpers does not exist
import helpers.GameHelper;
^
Game.java:12: cannot access GameHelper
bad class file: .\GameHelper.class
class file contains wrong class: chap05.GameHelper
Please remove or make sure it appears in the correct subdirectory of the classpa
th.
GameHelper helper = new GameHelper();
^
2 errors

According to the error which is showing GameHelper is in the package chap05, while importing you imported from helpers.GameHelper

[Mike Kris]

Chap 05......!!!

i am sorry to say, i am very novice and i didn't understand that..... Kindly help me by giving more details or how to fix it please.

Thanks,
Mike

[Chiranjeevi Kanthraj]

GameHelper.java is in the folder chap05
rename that chap05 folder in D: to helpers
then try to compile

[Campbell Ritchie]

Better to copy the code from the book (though some of it has misprints in), and leave out the package declarations at this stage. They are in the downloaded code to separate the files into folders. You would also miss out most of the "import"s.