DAO做成泛型的知识

package testDao;

import java.lang.reflect.ParameterizedType;

public class BaseDaoImpl<T,M> {

private Class clazz;

public BaseDaoImpl() {

ParameterizedType pt = (ParameterizedType) this.getClass()

.getGenericSuperclass();

this.clazz = (Class) pt.getActualTypeArguments()[0];

System.out.println("Type为： " + clazz.getSimpleName());

this.clazz=(Class) pt.getActualTypeArguments()[1];

System.out.println("第二个Type为： " + clazz.getSimpleName());

}

}

参数化类型

测试

package testDao;

import bean.BaseRole;

import bean.Person;

public class UserDao extends BaseDaoImpl<Person,BaseRole> {

public static void main(String[] args) {

UserDao dao=new UserDao();

}

}