answerdaofactory.java

来自「简易的java问答系统」· Java 代码 · 共 24 行

package cn.netjava.factory;

import cn.netjava.dao.*;
import cn.netjava.dao.impl.*;

public class AnswerDAOFactory {
	private static AnswerDAOImpl a = null;

	/**
	 * 
	 * @return PersonDAO具体实现类
	 */
	public static AnswerDAO getAnswerDAOInstance() {
		if (null == a)
			a = new AnswerDAOImpl();
		return a;
	}

	// 不允许实例化
	private AnswerDAOFactory() {

	}
}