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SimpleDotCom ArrayList test

Posts: 2
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Hi Everybody,

I am new to Java. I was trying an example in Head First Java book. this is Simpledotcom example. SimpleDotCom give me error of saying it cannot accept the int array to ArrayList object in method CheckYourSelf method. Does anybody know how to pass this to a ArrayList.

I am not able to figure out how to do it. Could anybody help me please.

Below is the code

public class SimpleDotComGame {

public static void main(String[] args) {

int numOfGuesses = 0;

GameHelper helper = new GameHelper();

DotCom theDotCom = new DotCom();

int randomNum = (int) (Math.random() * 5);

int[] locations = {randomNum, randomNum+1, randomNum+2};


boolean isAlive = true;

while(isAlive == true) {
String guess = helper.getUserInput("enter a number");

String result = theDotCom.checkYourself(guess);


if (result.equals("kill")) {
isAlive = false;

System.out.println("you took " + numOfGuesses + " guesses");
}// close if
}// close while

}// close main

}// close class


public class GameHelper {
public String getUserInput(String prompt) {
String inputLine = null;
System.out.print(prompt + " ");
try {
BufferedReader is = new BufferedReader(new InputStreamReader(;
inputLine = is.readLine();
if (inputLine.length() == 0 ) return null;
} catch (IOException e) {
System.out.println("IOException: " + e);

return inputLine;
import java.util.ArrayList;

public class DotCom {

private ArrayList<Integer> locationCells;

public void setLocationCells(ArrayList<Integer> loc) {
locationCells = loc;

public String checkYourself(String userInput) {

String result = "miss";

int index = locationCells.indexOf(userInput);

if (index >= 0) {


if (locationCells.isEmpty()) {
result = "kill";
} else {
result = "hit";

} //close if
} //close outer if

return result;
}// close method

public void setLocationCells(int[] locations) {
// TODO Auto-generated method stub

} //close class
Ranch Hand
Posts: 36
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int is a primitive datatype.
ArrayList accepts only objects not primitives.

Hence you got the error.Figure out how to convert int to Integer Object and pass the same to Arraylist.
Convert your integer array to Arraylist.
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