How to remove question in Java program for quiz mode given the following code for adding a question?

public void addQuestion() Question newQuestionnew Question() String questionCode-getQuestionCode) Question existingQuestion questions.get (questionCode); while(existingQuestion! null){ System.out.println("Question exists": questionCode - getQuestionCode (); existingQuestion questions.get (questionCode); newQuestion.SetQuestionCode (questionCode); String questionText -getQuestionText); newQuestion.SetQuestionText(questionText); int numberOfQuestiongetNumberOfQuestions(); newQuestion.createQuestionAnswerArray (numberOfQuestion); String answer for (int 1-0 inumberOfQuestion i+) answer getAnswerText(i+1, questionCode) newQuestion.questionAnswers[i] - answer; int correctAnswer - getCorrectAnswer (numberOfQuestion) newQuestion.SetCorrectAnswerNumber (correctAnswer) questions.put (questionCode, newQuestion) System.out.printf("Question %s s saved ", questionCode); System.out.println("")