我會走向何方

package?com.fangq.collections;
/**?*//**
?*?
?*?@author?fangq
?*
?*/
public?class?StudentDTO?{
????private?String?xm;//姓名
????private?String?xh;//學號
????private?String?nl;//年齡
????public?String?getNl()?{
????????return?nl;
????}
????public?void?setNl(String?nl)?{
????????this.nl?=?nl;
????}
????public?String?getXh()?{
????????return?xh;
????}
????public?void?setXh(String?xh)?{
????????this.xh?=?xh;
????}
????public?String?getXm()?{
????????return?xm;
????}
????public?void?setXm(String?xm)?{
????????this.xm?=?xm;
????}
????
}

package?com.fangq.collections;

import?java.util.Comparator;
/**?*//**
?*?按dto的某個字段排序
?*?@author?fangq
?*
?*/
public?class?StudentComparator?implements?Comparator{

????public?int?compare(Object?arg0,?Object?arg1)?{
????????//?TODO?Auto-generated?method?stub
????????if(arg0?instanceof?StudentDTO&&arg1?instanceof?StudentDTO){
????????????StudentDTO?dto1?=?(StudentDTO)arg0;
????????????StudentDTO?dto2?=??(StudentDTO)arg1;
????????????int?nl1?=?Integer.parseInt(dto1.getNl());
????????????int?nl2?=?Integer.parseInt(dto2.getNl());
????????????if(nl1<nl2)
????????????????return?-1;
????????????else?if(nl1==nl2)
????????????????return?0;
????????????else
????????????????return?1;
????????????
????????}
????????return?-1;
????}

????

}

TestComparator.java
package com.fangq.collections;

import java.util.Arrays;

import org.apache.commons.lang.math.RandomUtils;
/**
?*
?* @author?fangq
?*/
public class TestComparator {
?public static void main(String[] args){
??StudentDTO[] dtos = new StudentDTO[10];
??for(int i=0;i<dtos.length;i++){
???dtos[i] = new StudentDTO();
???dtos[i].setXh("xh"+i);
???dtos[i].setXm("xm"+i);
???dtos[i].setNl(String.valueOf(i+RandomUtils.nextInt(20)));
??}
??System.out.println("排序前===============");
??for(int j=0;j<dtos.length;j++)
??System.out.println("姓名："+dtos[j].getXm()+"年齡："+dtos[j].getNl());
??
??Arrays.sort(dtos,new StudentComparator());
??System.out.println("排序后===============");
??for(int k=0;k<dtos.length;k++)
??System.out.println("姓名："+dtos[k].getXm()+"年齡："+dtos[k].getNl());
??
?}
}