03-Java反射机制

转自：http://blog.csdn.net/tanksyg/article/details/49928115

User.java：

package cn.tzz.lang.clazz;  
  
public class User {  
  
    private Integer id;  
    private String name;  
    public Integer getId() {  
        return id;  
    }  
    public void setId(Integer id) {  
        this.id = id;  
    }  
    public String getName() {  
        return name;  
    }  
    public void setName(String name) {  
        this.name = name;  
    }  
      
} 

 BaseHibernateDao.java：

    public class BaseHibernateDao<T,ID extends Serializable> {  
          
        private Class<T> clazz;  
          
        public BaseHibernateDao(){  
            //当前对象的直接超类的 Type  
            Type genericSuperclass = getClass().getGenericSuperclass();  
            if(genericSuperclass instanceof ParameterizedType){  
                //参数化类型  
                ParameterizedType parameterizedType= (ParameterizedType) genericSuperclass;  
                //返回表示此类型实际类型参数的 Type 对象的数组  
                Type[] actualTypeArguments = parameterizedType.getActualTypeArguments();  
                this.clazz= (Class<T>)actualTypeArguments[0];  
            }else{  
                this.clazz= (Class<T>)genericSuperclass;  
            }  
        }  
      
        public Class<T> getClazz() {  
            return clazz;  
        }  
    }  

 

public class UserService extends BaseHibernateDao<User, Integer>{  
  
} 

 

测试实例：

    public class TestUserService {  
        public static void main(String[] args) {  
            UserService userService = new UserService();  
            System.out.println(userService.getClass());  
        }  
    }  

 

运行结果：

class cn.tzz.lang.clazz.User