paper.java

考试系统

package paper;

import java.io.Serializable;
import java.util.Vector;

/**
 * @author SpiritRain
 *
 * paper contains a question set
 * and the answer of user
 * 
 */
public class Paper implements Serializable {
	private String pName;
	private int questionCount;
	private Vector questions;
	private Vector userAnswer;

	/**
	 * Create an empty paper with paper name = pName
	 * @param pName paper Name
	 */
	public Paper(String pName) {
		this.pName = pName;
		questions = new Vector();
		userAnswer = new Vector();
		questionCount = 0;
	}

	/**
	 * Appends a question at the end of questions set
	 * @param q the question to be Appended 
	 */
	public void addQuestion(AbstractQuestion q) {
		this.userAnswer.add(null);
		this.questions.add(null);
		this.setQuestion(questionCount++, q);
	}

	/**
	 * calculate total score of user's answer
	 * @return int of score
	 */
	public int calScore() {
		int score = 0;
		for (int i = 0; i < questionCount; i++) {
			score += this.getQuestion(i).check(this.getAnswer(i));
		}
		return score;
	}

	/**
	 * get user answer
	 * @param index user's answer index
	 * @return user's answer
	 */
	public AbstractAnswer getAnswer(int index) {
		return (AbstractAnswer) userAnswer.get(index);
	}

	/**
	 * get key answer
	 * @param index key answer index
	 * @return key answer
	 */
	public AbstractAnswer getKey(int index) {
		return getQuestion(index).getKey();
	}

	/**
	 * get the Name of paper
	 * @return String of paper name
	 */
	public String getName() {
		return pName;
	}

	/**
	 * get the question at the specified position 
	 * @param index question position
	 * @return AbstractQuestion
	 */
	public AbstractQuestion getQuestion(int index) {
		//		return questions[index];
		return (AbstractQuestion) questions.get(index);
	}

	/**
	 * return how many questions in the paper
	 * @return int of question acount
	 */
	public int getQuestionCount() {
		return questionCount;
	}

	/**
	 * Replaces the Answer at the specified position with ans
	 * @param index the positon ans will be placed 
	 * @param ans new AbstractAnswer
	 */
	public void setAnswer(int index, AbstractAnswer ans) {
		this.userAnswer.set(index, ans);
	}

	/**
	 * change paper name to name
	 * @param name new name of the paper
	 */
	public void setName(String name) {
		this.pName = name;
	}

	/**
	 * Replaces the Question at the specified position with q
	 * @param index the positon q will be placed 
	 * @param q new question
	 */
	public void setQuestion(int index, AbstractQuestion q) {
		this.questions.set(index, q);
		this.userAnswer.add(null);
		if (index > questionCount) {
			questionCount = index;
		}
	}
}