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");