abstractquestion.java

考试系统

package paper;

import java.io.Serializable;

/**
 * @author SpiritRain
 *
 * Abstract class of Question
 * 
 */
public abstract class AbstractQuestion implements Serializable {
	/**
	 * to identify Binary Question 
	 */
	public static final int BINARY = 1;
	/**
	 * to identify Choice Question 
	 */
	public static final int CHOICE = 2;
	/**
	 * to identify factual Question 
	 */
	public static final int FACTUAL = 0;
	/**
	 * Store Question Name 
	 */
	public static final String[] TYPENAME =
		{ "Factual Question", "Binary Question", "Choice Question" };

	/**
	 * create a new empty question with specifically type
	 * @param type Question type
	 * @return Question
	 */
	public static AbstractQuestion createNewQuestion(int type) {
		if (type == FACTUAL) {
			return new FactualQuestion("", null, "", 0, 0);
		} else if (type == BINARY) {
			return new BinaryQuestion("", null, "", 0, 0);
		} else if (type == CHOICE) {
			return new ChoiceQuestion("", null, "", 0, 0);
		} else {
			return null;
		}
	}

	/**
	 * answers of the question 
	 */
	protected AbstractAnswerSet answers;
	/**
	 * difficulty value
	 */
	protected int diff;
	/**
	 * hints String
	 */
	protected String hint;
	/**
	 * Strings to describe the question
	 */
	protected String questionText;
	/**
	 * score value
	 */
	protected int score;

	/**
	 * Create a question and initiate variables  
	 * @param qutestionText question string to discribe the question
	 * @param answers answer of the question
	 * @param hint hint of the question
	 * @param score score of the question
	 * @param diff difficulty of the question
	 */
	public AbstractQuestion(
		String qutestionText,
		AbstractAnswerSet answers,
		String hint,
		int score,
		int diff) {
		this.questionText = qutestionText;
		this.answers = answers;
		this.hint = hint;
		this.score = score;
		this.diff = diff;
	}

	/**
	 * if ans is correct, return score
	 * else return 0
	 * @param ans the answer to be checked
	 */
	public int check(AbstractAnswer ans) {
		if (answers.check(ans)) {
			return score;
		} else {
			return 0;
		}
	}

	/**
	 * return the score of the question
	 * @return score value
	 */
	public int getQuestionScore() {
		return score;
	}

	/**
	 * return the difficulty of the question
	 * @return difficulty value
	 */
	public int getDifficulty() {
		return diff;
	}

	/**
	 * get hint of the question
	 * @return string of hint
	 */
	public String getHint() {
		return hint;
	}

	/**
	 * get key answer of the question
	 * @return key answer
	 */
	public AbstractAnswer getKey() {
		return answers.getKey();
	}

	/**
	 * return question text of the question
	 * @return string of question text
	 */
	public String getQuestionText() {
		return questionText;
	}

	/**
	 * return the type of current question
	 * @return type value
	 */
	public abstract int getType();
}