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Suman Adhikari

Game Not Working

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Suman Adhikari    109
Well, this a Game from the HEAD FIRST JAVA book...and there I found an error when I compiled it!!
Please help me compile the program without error!!
 
It's a game called Sink the Dot Com !!
 
____________________________________________________________________________________
 
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.println(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 x = 0;
int row = 0;
int column = 0;
while (x < comSize) {
grid[coords[x]] = 1;
row = (int) (coords[x] / gridLength);
column = coords[x] % gridLength;
temp = String.valueOf(alphabet.charAt(column));
alphaCells.add(temp.concat(Integer.toString(row)));
x++;      
}
return alphaCells;
}
}
 
 
____________________________________________________________________________________
 
 

public class DotComBust {
private GameHelper helper = new GameHelper();
private ArrayList<DotCom> dotComsList = new ArrayList<DotCom>();
private int numOfGuesses = 0;
 
private void setUpGame() {
DotCom one = new DotCom();
one.setName("Pets.com");
DotCom two = new DotCom();
two.setName("eToys.com");
DotCom three = new DotCom();
three.setName("Go2.com");
dotComsList.add(one);  
dotComsList.add(two);
dotComsList.add(three);
 
System.out.println("Your goal is to sink three dot coms.");
System.out.println("Pets.com, eToys.com, Go2.com");
System.out.println("Try to sink them all in the fewest number of guesses");
 
for (DotCom dotComToSet : dotComsList) {
ArrayList<String> newLocation = helper.placeDotCom(3);
dotComToSet.setLocationCells(newLocation);
}
}
 
private 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 (DotCom dotComToTest:dotComsList) {
result = dotComToTest.checkYourself(userGuess);
if (result.equals("hit")) {
break;
}
if (result.equals("kill")) {
dotComsList.remove(dotComToTest);
break;
}
}
System.out.println(result);
}
 
 
private void finishGame() {
System.out.println("All Dot Coms are dead! Your stock is now worthless.");
if (numOfGuesses <= 18) {
System.out.println("It only took you “ + numOfGuesses + “ guesses.");
System.out.println(" You got out before your options sank.");
} else {
System.out.println("Took you long enough. “+ numOfGuesses + “ guesses.");
System.out.println("Fish are dancing with your options");
}
}
 
public static void main(String[] args) {
DotComBust game = new DotComBust();
game.setUpGame();
game.startPlaying();
}
 
}
 
 
____________________________________________________________________________________
 
import java.util.*;
public class DotCom {
private ArrayList<String> locationCells;
private String name;
 
public void setLocationCells(ArrayList<String> loc) {
locationCells = loc;
}
 
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";
}
}
}
}
 
____________________________________________________________________________________
 
 
What seems to be the error in the above code!! 
When I compile it...The following error occurs!!
 
 
Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
 
at DotComBust.main(DotComBust.java:65)
 
 
 
 
 
Please...Someone help me on this JAVA stuff!!
 
 
 
 
 
 
Edited by DummyID

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Nicholas Kong    1535

Here is the fix: Above the last 2 braces of the DotCom Class, type "return result". The author forgot to put that. Your program will work now if you put that return statement. 

 

What chapter of the book is this? If you are just starting out with Java, this program would be an overkill because it involves built-in classes in the language and some he is writing from scratch. I would suggest focusing and writing one class with the main method instead of 4 classes and see what the code is doing line by line.

Edited by warnexus

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Muzzy A    737
// This is what he meant by putting tags around it
// just put '[code]' in front of the beginning of the code, and '[/code]' at the end
// and you might want to space it out like it should be, so we can all read it lol
 
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.println(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 x = 0;
int row = 0;
int column = 0;
while (x < comSize) {
grid[coords[x]] = 1;
row = (int) (coords[x] / gridLength);
column = coords[x] % gridLength;
temp = String.valueOf(alphabet.charAt(column));
alphaCells.add(temp.concat(Integer.toString(row)));
x++;      
}
return alphaCells;
}
}
 
____________________________________________________________________________________
 

 
public class DotComBust {
private GameHelper helper = new GameHelper();
private ArrayList<DotCom> dotComsList = new ArrayList<DotCom>();
private int numOfGuesses = 0;
 
private void setUpGame() {
DotCom one = new DotCom();
one.setName("Pets.com");
DotCom two = new DotCom();
two.setName("eToys.com");
DotCom three = new DotCom();
three.setName("Go2.com");
dotComsList.add(one);  
dotComsList.add(two);
dotComsList.add(three);
 
System.out.println("Your goal is to sink three dot coms.");
System.out.println("Pets.com, eToys.com, Go2.com");
System.out.println("Try to sink them all in the fewest number of guesses");
 
for (DotCom dotComToSet : dotComsList) {
ArrayList<String> newLocation = helper.placeDotCom(3);
dotComToSet.setLocationCells(newLocation);
}
}
 
private 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 (DotCom dotComToTest:dotComsList) {
result = dotComToTest.checkYourself(userGuess);
if (result.equals("hit")) {
break;
}
if (result.equals("kill")) {
dotComsList.remove(dotComToTest);
break;
}
}
System.out.println(result);
}
 
 
private void finishGame() {
System.out.println("All Dot Coms are dead! Your stock is now worthless.");
if (numOfGuesses <= 18) {
System.out.println("It only took you “ + numOfGuesses + “ guesses.");
System.out.println(" You got out before your options sank.");
} else {
System.out.println("Took you long enough. “+ numOfGuesses + “ guesses.");
System.out.println("Fish are dancing with your options");
}
}
 
public static void main(String[] args) {
DotComBust game = new DotComBust();
game.setUpGame();
game.startPlaying();
}
 
}
 
____________________________________________________________________________________
 

import java.util.*;
public class DotCom {
private ArrayList<String> locationCells;
private String name;
 
public void setLocationCells(ArrayList<String> loc) {
locationCells = loc;
}
 
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";
}
}
}
}


Edited by Muzzy A

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ultramailman    1720

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
 
at DotComBust.main(DotComBust.java:65)

Also, the error message should give you some hint as to where it went wrong, even if it doesn't tell you exactly what. In this case, it points to DotComBust.java, line 65 (or somewhere near that line).

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Suman Adhikari    109

hat chapter of the book is this? If you are just starting out with Java, this program would be an overkill because it involves built-in classes in the language and some he is writing from scratch. I would suggest focusing and writing one class with the main method instead of 4 classes and see what the code is doing line by line.

Well, it;s the full game...and I'm learning from 5 books at the same time so 

having a little hangover!!

 

Plus exams on head!!

 

Will finish it in about a week if I use the forum well!!

 

And I MEAN 1 WEEK TIME CONTINUOUSLY!!

 

not with break!!

 

P.S. chk my page!! 

 

http://fb.com/IntelligenceIsMyCommonSense

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Suman Adhikari    109


public class DotComBust {
private GameHelper helper = new GameHelper();
private ArrayList<DotCom> dotComsList = new ArrayList<DotCom>();
private int numOfGuesses = 0;
 
private void setUpGame() {
DotCom one = new DotCom();
one.setName("Pets.com");
DotCom two = new DotCom();
two.setName("eToys.com");
DotCom three = new DotCom();
three.setName("Go2.com");
dotComsList.add(one);  
dotComsList.add(two);
dotComsList.add(three);
 
System.out.println("Your goal is to sink three dot coms.");
System.out.println("Pets.com, eToys.com, Go2.com");
System.out.println("Try to sink them all in the fewest number of guesses");
 
for (DotCom dotComToSet : dotComsList) {
ArrayList<String> newLocation = helper.placeDotCom(3);
dotComToSet.setLocationCells(newLocation);
}
}
 
private 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 (DotCom dotComToTest:dotComsList) {
result = dotComToTest.checkYourself(userGuess);
if (result.equals("hit")) {
break;
}
if (result.equals("kill")) {
dotComsList.remove(dotComToTest);
break;
}
}
System.out.println(result);
}
 
 
private void finishGame() {
System.out.println("All Dot Coms are dead! Your stock is now worthless.");
if (numOfGuesses <= 18) {
System.out.println("It only took you “ + numOfGuesses + “ guesses.");
System.out.println(" You got out before your options sank.");
} else {
System.out.println("Took you long enough. “+ numOfGuesses + “ guesses.");
System.out.println("Fish are dancing with your options");
}
}
 
public static void main(String[] args) { //Line 65!!
DotComBust game = new DotComBust();
game.setUpGame();
game.startPlaying();
}
}

The error still exists at line 65...I marked the error!!

 

 
Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
 
at DotComBust.main(DotComBust.java:65)
 
Some1 plz help with this stupid error!!
 
I am using Eclipse... Is it because of Eclipse??
Edited by DummyID

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BitMaster    8651

Some1 plz help with this stupid error!!

Don't you think it's a bit stupid that you ask people to sink quite a bit of time into your problem and you don't even have the time or interest to type "someone" and "please"?

I am using Eclipse... Is it because of Eclipse??

No.

You told Eclipse to launch the application despite the fact that your program is not a valid, compilable Java program. Fix whatever error is around line 65 in DotComBust.java.

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Suman Adhikari    109

Some1 plz help with this stupid error!!

Don't you think it's a bit stupid that you ask people to sink quite a bit of time into your problem and you don't even have the time or interest to type "someone" and "please"?

>I am using Eclipse... Is it because of Eclipse??

No.

You told Eclipse to launch the application despite the fact that your program is not a valid, compilable Java program. Fix whatever error is around line 65 in DotComBust.java.

 

Well...First of all...I am not a JAVA professional...am still a learner!!

 

Now would you please look into it!!

 

if(you.are.happy){

System.out.println("Please look into it!!");

}else{

System.out.println("Knowledge is Peace!!");

}

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