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：

package com.app;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

public class app {
    
    private static ArrayList<good> goodlist;
    /**
     * @param args
*/
    public app(){
        goodlist = new ArrayList<good>();
    }
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        ObjectOutputStream os = null;
        good good1 = new good();
        good1.setYear(2001);
        good1.setMonth(11);
        good1.setDay(2);
        good1.setId(0);
        
        ArrayList<good> input = new ArrayList<good>();//ArrayList中存储着对象的地址
        input.add(good1);
        
        good good2 = new good();
        good2.setYear(2001);
        good2.setMonth(10);
        good2.setDay(2);
        good2.setId(1);
        input.add(good2);
        
        good good3 = new good();
        good3.setYear(1991);
        good3.setMonth(10);
        good3.setDay(12);
        good3.setId(2);
        input.add(good3);
        
        try {
            os = new ObjectOutputStream(new FileOutputStream("./good.dat"));
            os.writeObject(input);
            os.flush();
            os.close();
        
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        try {
            ObjectInputStream ois=new ObjectInputStream(new FileInputStream("good.dat"));
        
            //答应good列表
            goodlist = (ArrayList<good>)ois.readObject();//序列化中读出的和写入的类型是一样，否额
//出现cast错误
            
//goodlist根据日期排序
            Comparator<good> comparator = new Comparator<good>(){
                public int compare(good input1, good input2){
                    if(input1.getYear() != input2.getYear()){
                        return input1.getYear() - input2.getYear();
                    }else{
                        if(input1.getMonth() != input2.getMonth()){
                            return input1.getMonth() - input2.getMonth();
                        }else{
                            return input1.getDay() - input2.getDay();
                        }
                    }                
                }
            };
            
            Collections.sort(goodlist, comparator);
            
            for(int i = 0; i < goodlist.size(); i++){
                System.out.println(goodlist.get(i).getId());
                System.out.println(goodlist.get(i).getYear());
                System.out.println(goodlist.get(i).getMonth());
                System.out.println(goodlist.get(i).getDay());
            }
            
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }        
    }
}