java - Adding item to the quizQuestion ArrayList -

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hey guys have method 

public void addquestion(question question) {  }

i have created arraylist in class section

private arraylist<question> quizquestion;

and have initialised arraylist in constructor typing 

quizquestion = new arraylist<question>();

what type in method above can add questions question arraylist. :)

public void addquestion(question question) {      quizquestion.add(question); }

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