是否可以在優化跟改進

package com.imooc.serial;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;


public class ProductTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Product iphone = new Product("123","iphone","telephone",4888);
		Product ipad= new Product("234","ipad","computer",5088);
		Product macbook = new Product("345","macbook","computer",10688);
		Product iwatch= new Product("256","iwatch","watch",4799);
		
		try {
			FileOutputStream fos = new FileOutputStream("apple.txt");
			ObjectOutputStream oos = new ObjectOutputStream(fos);
			FileInputStream fis = new FileInputStream("apple.txt");
			ObjectInputStream ois = new ObjectInputStream(fis);
			oos.writeObject(iphone);
			oos.writeObject(ipad);
			oos.writeObject(macbook);
			oos.writeObject(iwatch);
			oos.flush();
			try {
				
				System.out.println(ois.readObject());
				System.out.println(ois.readObject());
				System.out.println(ois.readObject());
				System.out.println(ois.readObject());
				
				
				
			} catch (ClassNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			fos.close();
			oos.close();
			fis.close();
			ois.close();
			
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		

	}

}