ArrayList排序与对象的序列化

将good队列序列化到文件，并根据日期排序输出；
public class good implements Serializable
代码如下：
View Code
  1 package com.app;
  2 import java.io.FileInputStream;
  3 import java.io.FileNotFoundException;
  4 import java.io.FileOutputStream;
  5 import java.io.IOException;
  6 import java.io.ObjectInputStream;
  7 import java.io.ObjectOutputStream;
  8 import java.io.Serializable;
  9 import java.util.ArrayList;
 10 import java.util.Collections;
 11 import java.util.Comparator;
 12 
 13 public class app {
 14     
 15     private static ArrayList<good> goodlist;
 16     /**
 17      * @param args
 18 */
 19     public app(){
 20         goodlist = new ArrayList<good>();
 21     }
 22     
 23     public static void main(String[] args) {
 24         // TODO Auto-generated method stub
 25         ObjectOutputStream os = null;
 26         good good1 = new good();
 27         good1.setYear(2001);
 28         good1.setMonth(11);
 29         good1.setDay(2);
 30         good1.setId(0);
 31         
 32         ArrayList<good> input = new ArrayList<good>();//ArrayList中存储着对象的地址
 33         input.add(good1);
 34         
 35         good good2 = new good();
 36         good2.setYear(2001);
 37         good2.setMonth(10);
 38         good2.setDay(2);
 39         good2.setId(1);
 40         input.add(good2);
 41         
 42         good good3 = new good();
 43         good3.setYear(1991);
 44         good3.setMonth(10);
 45         good3.setDay(12);
 46         good3.setId(2);
 47         input.add(good3);
 48         
 49         try {
 50             os = new ObjectOutputStream(new FileOutputStream("./good.dat"));
 51             os.writeObject(input);
 52             os.flush();
 53             os.close();
 54         
 55         } catch (FileNotFoundException e) {
 56             // TODO Auto-generated catch block
 57             e.printStackTrace();
 58         } catch (IOException e) {
 59             // TODO Auto-generated catch block
 60             e.printStackTrace();
 61         }
 62         
 63         try {
 64             ObjectInputStream ois=new ObjectInputStream(new FileInputStream("good.dat"));
 65         
 66             //答应good列表
 67             goodlist = (ArrayList<good>)ois.readObject();//序列化中读出的和写入的类型是一样，否额
 68 //出现cast错误
 69             
 70 //goodlist根据日期排序
 71             Comparator<good> comparator = new Comparator<good>(){
 72                 public int compare(good input1, good input2){
 73                     if(input1.getYear() != input2.getYear()){
 74                         return input1.getYear() - input2.getYear();
 75                     }else{
 76                         if(input1.getMonth() != input2.getMonth()){
 77                             return input1.getMonth() - input2.getMonth();
 78                         }else{
 79                             return input1.getDay() - input2.getDay();
 80                         }
 81                     }                
 82                 }
 83             };
 84             
 85             Collections.sort(goodlist, comparator);
 86             
 87             for(int i = 0; i < goodlist.size(); i++){
 88                 System.out.println(goodlist.get(i).getId());
 89                 System.out.println(goodlist.get(i).getYear());
 90                 System.out.println(goodlist.get(i).getMonth());
 91                 System.out.println(goodlist.get(i).getDay());
 92             }
 93             
 94         } catch (FileNotFoundException e) {
 95             // TODO Auto-generated catch block
 96             e.printStackTrace();
 97         } catch (IOException e) {
 98             // TODO Auto-generated catch block
 99             e.printStackTrace();
100         } catch (ClassNotFoundException e) {
101             // TODO Auto-generated catch block
102             e.printStackTrace();
103         }        
104     }
105 }