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Property null when it looks like it shouldn't


well, can't see any obvious issues here.

However, I would say the "protected" attribute using here not looking good to me, would recommend in Question class you have:

private ArrayList<Answer> answers
= new ArrayList<Answer>();
protected ArrayList<Answer> getAnswers(){
    return answers;
}

In sub class TrueFalse, refer that by getter method

System.out.println(question.getAnswers());

question.getAnswers().add(answer);

Categories : Java

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