Qfyilyi

I'm getting this error "Attempt to invoke virtual method 'java.lang.String eecs1022.caps.Game.qa()' on a null object reference"

I just want to know why im getting this error and how I can work around it.

The game object is returns a string but for some reason it says its a null object. Here is my main class and my game class.

MAIN:

private Game game;

private String question = "";

private String answer = "";

private int score = 1;

private int qNum = 1;





@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    ask();

    }





public void ask(){



    String apple = game.qa();

    int indexanswer = apple.indexOf("n");

    answer = apple.substring(indexanswer);

    question = apple.substring(0,indexanswer);



    ((TextView)findViewById(R.id.question)).setText(question);



}



public void onDone (View v){



    if (qNum == 10){

        finish();

    }



    String answerinput = ((EditText)findViewById(R.id.answer)).toString();



    if (answer.equalsIgnoreCase(answerinput)){

        score++;

    }



    String oldlog = ((TextView)findViewById(R.id.log)).toString();

    String a = oldlog + "n" + "Q# " + qNum + ": " + question + "n" + "Your answer" + answerinput.toUpperCase() + "n" + "Correct Answer: " + answer + "n";

    ((TextView)findViewById(R.id.log)).setText(a);



    qNum++;

    String orange = "SCORE = " + score;

    String banana = "Q# " + qNum;



    ((TextView)findViewById(R.id.score)).setText(orange);

    ((TextView)findViewById(R.id.qNum)).setText(banana);



    ask();

}

}

GAME:

         public class Game {



public String capitalanswer = "";

public String countryanswer = "";



private CountryDB db;



public Game(){

    this.db = new CountryDB();

}



public String qa(){



    List<String> countries = db.getCapitals();

    int n = countries.size();

    int index = (int)( n * Math.random());

    String c = countries.get(index);

    capitalanswer = c;

    System.out.println(capitalanswer);



    Map<String, Country> data = db.getData();

    Country ref = data.get(c);

    countryanswer = ref.toString();

    System.out.println(countryanswer);



    if (Math.random() < 0.5){

        return "What country has the capital " + ref.getCapital() + " ?" + "n" + ref.getName();

    }else{

        return "What is the capital of " + ref.getName() + " ?" + "n" + ref.getCapital();

    }



}

}

Any help is appreciated!

By doing this:
private Game game;

You declare the variable game, but you don't actually initialise it. That tells the compiler that you will be using game to refer to a variable whose type is Game. However, you don't actually give a value to game. That is why game is null.

To initialise game, you should be doing this instead:
private Game game = new Game();