daofactory.java

来自「电话号码查询系统 要求有电话录入」· Java 代码 · 共 12 行

public class DaoFactory {

	synchronized public static DaoInterface getDao() {
		DaoInterface dao = null;
		if (dao == null) {
			dao = new DaoImpl();
			return dao;
		}
		return dao;
	}
}