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9,985 PointsWhat is going on?
I tried to run on IntellJ and this is what I got
Prompter.promptForGuess(Prompter.java:15) at nyc.c4q.personabe1984.Hangman.main(Hangman.java:10) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
then when I tried to run console I got
javac Hangman.java && java Hangman Hangman.java:7: error: cannot find symbol Game game = new Game("Treehouse"); ^ symbol: class Game location: class Hangman Hangman.java:7: error: cannot find symbol Game game = new Game("Treehouse"); ^ symbol: class Game location: class Hangman Hangman.java:9: error: cannot find symbol Prompter prompter = new Prompter(game); ^ symbol: class Prompter location: class Hangman Hangman.java:9: error: cannot find symbol Prompter prompter = new Prompter(game); ^ symbol: class Prompter location: class Hangman 4 errors Hans (master *+) personabe1984 $ javac Game.java Hans (master *+) personabe1984 $ javac Prompter.java Prompter.java:8: error: cannot find symbol private Game mGame; ^ symbol: class Game location: class Prompter Prompter.java:10: error: cannot find symbol public Prompter(Game game){ ^ symbol: class Game location: class Prompter 2 errors
9 Answers
Ryan Blakeney
8,870 PointsAlright so, i am literally in the same spot and i literally had the exact issue. It was answered in this thread: https://teamtreehouse.com/community/how-to-fix-javalangnullpointerexception
You need to import a scanner and replace the console with scanner and it works perfect.
Scanner console = new Scanner(System.in);
System.out.println("Enter a letter: ");
String guessAsString = console.nextLine();
Ryan Blakeney
8,870 PointsCan you please post your code?
sldknflskdngd
9,985 Pointspublic class Hangman {
public static void main(String[] args){
Game game = new Game("Treehouse");
Prompter prompter = new Prompter(game);
boolean isHit = prompter.promptForGuess();
if(isHit){
System.out.println("is a hit");
}else{
System.out.println("is a miss");
}
}
}
sldknflskdngd
9,985 Pointsimport java.io.Console;
public class Prompter {
private Game mGame;
public Prompter(Game game){
mGame = game;
}
public boolean promptForGuess(){
Console console = System.console();
String guessAsString = console.readLine("Enter a letter: ");
char guess = guessAsString.charAt(0);
return mGame.applyGuesses(guess);
}
}
sldknflskdngd
9,985 Pointspublic class Game { private String mAnswer; private String mHits; private String mMisses;
public Game(String answer){
mAnswer = answer;
mHits = "";
mMisses = "";
}
public boolean applyGuesses(char letter){
boolean isHit = mAnswer.indexOf(letter) >= 0;
if(isHit){
mHits += letter;
}else{
mMisses += letter;
}
return isHit;
}
}
sldknflskdngd
9,985 PointsThe console object is not sitting well when I run it on intelliJ so when I tried to do it on terminal I still get the errors above.
sldknflskdngd
9,985 PointsThanks. That solved the problem. But do you know why we cannot use the Console object?
sldknflskdngd
9,985 Pointsnever mind apparently even with the import the Console object is not available on IDE. So strange.
Ryan Blakeney
8,870 PointsBecause we are not running the program in the Console, we are running it in the IDE. Its explained in that thread better than i could explain it.
Stephen Wall
Courses Plus Student 27,294 PointsStephen Wall
Courses Plus Student 27,294 PointsThis fixes it, runs perfectly thanks!