List对象排序通用方法

 import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 import java.lang.reflect.Method;
 import java.lang.reflect.InvocationTargetException;
 /**
 * 通用排序
 */
 public class SortList<E>{
     public void Sort(List<E> list, final String method, final String sort){
         Collections.sort(list, new Comparator() {
             public int compare(Object a, Object b) {
                 int ret = 0;
                 try{
                     Method m1 = ((E)a).getClass().getMethod(method, null);
                     Method m2 = ((E)b).getClass().getMethod(method, null);
                     if(sort != null && "desc".equals(sort))//倒序
                         ret = m2.invoke(((E)b), null).toString().compareTo(m1.invoke(((E)a), null).toString());
                     else//正序
                         ret = m1.invoke(((E)a), null).toString().compareTo(m2.invoke(((E)b), null).toString());
                 }catch(NoSuchMethodException ne){
                     System.out.println(ne);
                 }catch(IllegalAccessException ie){
                     System.out.println(ie);
                 }catch(InvocationTargetException it){
                     System.out.println(it);
                 }
                 return ret;
             }
          });
     }
 }

调用示例：

 List<UserInfo> list = new ArrayList<UserInfo>();
 //调用排序通用类
 SortList<UserInfo> sortList = new SortList<UserInfo>();
 //按userId排序
 sortList.Sort(list, "getUserId", "desc");