struts2 iterator 排序

<s:bean id="myComparator" name="com.sample.util.MyComparator"></s:bean>  
  <s:sort comparator="myComparator" source="list">      
  <s:iterator status="st"> </s:iterator>  
 </s:sort>  

package com.sample.util;    
import java.util.Comparator;   
 public class MyComparator implements Comparator<Object> {      
public int compare(Object arg0, Object arg1) { 
    if(条件1){        
      return 1;// 排列顺序为 arg1, arg0
    }else if(条件2){
      return -1;//排列顺序为 arg0, arg1
    }
    return 0;
}