import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.Date;import java.util.List;/** * 排序List   * @param 
    
      排序的对象 */public class SortList
     
      {			public void sort(java.util.List
      
        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;		    }		 });	}		public static void main(String[] args)throws Exception{				class UserInfo{			private Integer id;			private String name;			private Date date;			public UserInfo(Integer id, String name, Date date){				this.id = id;				this.name = name;				this.date = date;			}			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;			}			public Date getDate() {				return date;			}			public String getDateFormatted() {				return new SimpleDateFormat("yyyy-MM-dd").format(date);			}			public void setDate(Date date) {				this.date = date;			}			@Override			public String toString() {				return id + ", " + name + ", " + getDateFormatted();			}		}				List
        
          list = new ArrayList
         
          (); SimpleDateFormat formater = new SimpleDateFormat("yyyy-MM-dd"); list.add(new UserInfo(3,"b",formater.parse("1980-12-01"))); list.add(new UserInfo(1,"c",formater.parse("1980-10-01"))); list.add(new UserInfo(2,"a",formater.parse("1973-10-01"))); System.out.println("-------原来序列-------------------"); for(UserInfo user : list){ System.out.println(user.toString()); } //调用排序类 SortList
          
            sortList = new SortList
           
            (); System.out.println("--------按id排序------------------"); sortList.sort(list, "getId", "desc"); for(UserInfo user : list){ System.out.println(user.toString()); } System.out.println("---------按name排序-----------------"); sortList.sort(list, "getName", null); for(UserInfo user : list){ System.out.println(user.toString()); } System.out.println("---------按date排序-----------------"); sortList.sort(list, "getDateFormatted", null); for(UserInfo user : list){ System.out.println(user.toString()); } }}