私有化构造函数后，使用反射初始化

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public interface IFactory {    public IUserDao createUserDao();    public IAddressDao createIAddress();}
//单例模式  私有化构造函数
public class MySqlDaoFactory implements IFactory{    private static MySqlDaoFactory osdf=new MySqlDaoFactory();    private MySqlDaoFactory(){};    public MySqlDaoFactory getInstance(){        if(osdf!=null){            return osdf;        }        return new MySqlDaoFactory();    }    public IUserDao createUserDao(){        return new UserDao();    }    public IAddressDao createIAddress(){        return new AddressDao();    }}

//反射
public class test01 {    @Test    public void testss(){        try {            String dao = "com.whb.test.MySqlDaoFactory";            Class clz =  Class.forName(dao);            Constructor<?> cn=clz.getDeclaredConstructor();            System.out.println(cn);            cn.setAccessible(true);            MySqlDaoFactory m= (MySqlDaoFactory)cn.newInstance();           IAddressDao ia= m.createIAddress();            ia.show();        } catch (Exception e) {            e.printStackTrace();        }    }}

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