examquestionservice.java

本系统是用NetBeans IDE 6.1所写

/*
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package com.online.service;

import com.online.dao.ExamQuestionDAO;

import java.util.List;

/**
 *
 * @author fyadmin
 */
public class ExamQuestionService {
    
    
    private List questionCollection = null;
    
    private ExamQuestionDAO dao = null;
    
    public ExamQuestionService() {                
        this.dao = new ExamQuestionDAO();
    }

    
    public List getQuestionCollection(){
        if ( questionCollection == null ) {
            questionCollection = dao.getExamQuestion();
        }
        return questionCollection;
    }
                 
}