java.io.NotSerializableException

  Java序列化的实现很简单,须要序列化的类实现Serializable接口;java

  而后就可使用ObjectOutStream的write()方法输出;app

  反序列化:使用 ObjectInputStream的read()方法便可输入;iphone

  序列化和反序列化实现很简单,可是要注意实现Serializable接口的类中不能有其余类的实例化对象;ide

  即:若是这个类中还包含别的类的实例,那么被调用的类也须要实现Serializable接口。this

  下面就是一个我在学序列化时,遇到的麻烦:spa

  嫌麻烦,在Serializable接口的类中实例化了Scanner类的对象,致使运行错误;code

  做业需求:对象

应用对象序列化和对象反序列化向文件写入对象,并将对象读取出来输入到控制台上。blog

效果图: 继承

//img.mukewang.com/climg/5af016d50001dc4902330565.jpg

任务要求:

一、建立Product类,并声明它的属性:ID,name,categories,price
二、继承Serializable接口;
三、定义Product类构造方法;
四、在Test类里面,建立Product类的对象:iphone,ipad,macbook,iwatch
五、实例化对象输入流和对象输出流;
六、写入Product类的四个对象;
七、从文件里读取四个product类的四个对象。

 

个人代码:

 1 import java.io.Serializable;  2 import java.util.Scanner;  3 
 4 public class Apple implements Serializable {  5     private String id;  6     private String name;  7     private String categories;  8     private double price;  9     Scanner sc = new Scanner(System.in); 10     public Apple(String id, String name, String categories, double price) { 11         this.setId(id); 12         this.setName(name); 13         this.setCategories(categories); 14         this.setPrice(price); 15  } 16     public String getId() { 17         return id; 18  } 19     public void setId(String id) { 20         this.id = id; 21  } 22     public String getName() { 23         return name; 24  } 25     public void setName(String name) { 26         this.name = name; 27  } 28     public String getCategories() { 29         return categories; 30  } 31     public void setCategories(String categories) { 32         this.categories = categories; 33  } 34     public double getPrice() { 35         return price; 36  } 37     public void setPrice(double price) { 38         this.price = price; 39  } 40  @Override 41     public String toString() { 42         return "产品ID:" + id + "\n产品名称:" + name + "\n产品属性:" + categories + "\n产品价格:" + price+"\n"; 43  } 44     
45 }

 

package com.task8; 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.OutputStream; import java.io.OutputStreamWriter; public class FileTest4 { public static void main(String[] args) { try { FileOutputStream fos = new FileOutputStream("apple.txt"); FileInputStream fis = new FileInputStream("apple.txt"); ObjectOutputStream obs = new ObjectOutputStream(fos); ObjectInputStream ois = new ObjectInputStream(fis); obs.writeObject(new Apple("123","iphone","telephone",4888.0)); obs.writeObject(new Apple("234","ipad","computer",5088.0)); obs.writeObject(new Apple("345","macbook","computer",10688.0)); obs.writeObject(new Apple("256","iwatch","watch",4799.0)); System.out.println("apple系列产品信息:"); for(int i = 0;i<4;i++) { try { System.out.println(ois.readObject()); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block
 e.printStackTrace(); } } fos.close(); fis.close(); obs.close(); ois.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block
 e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block
 e.printStackTrace(); } } }

运行结果:

 

 重要的事说三遍:

        实现Serializable接口的类中不能有其余类的实例化对象;

   实现Serializable接口的类中不能有其余类的实例化对象;

   实现Serializable接口的类中不能有其余类的实例化对象;

  即:若是这个类中还包含别的类的实例,那么被调用的类也须要实现Serializable接口。

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