public interface BaseDao<T> {      T get(String id);  }  

 1 import java.lang.reflect.ParameterizedType;   2 import java.lang.reflect.Type;   3    4 public abstract class HibernateBaseDao<T> implements BaseDao<T> {   5     private Class<T> entityClass;   6    7     /**  8      * 这个通常也是hibernate的取得子类class的方法  9      *  10      * @author "yangk" 11      * @date 2010-4-11 下午01:51:28 12      */  13     public HibernateBaseDao() {  14         Type genType = getClass().getGenericSuperclass();  15         Type[] params = ((ParameterizedType) genType).getActualTypeArguments();  16         entityClass = (Class) params[0];  17     }  18   19     @Override  20     public T get(String id) {  21         try {  22             return entityClass.newInstance();  23         } catch (InstantiationException e) {  24             // TODO Auto-generated catch block  25             e.printStackTrace();  26         } catch (IllegalAccessException e) {  27             // TODO Auto-generated catch block  28             e.printStackTrace();  29         }  30         return null;  31     }  32   33 }