Java.io.NotSerializableException

The implementation of the Java serialization is simple and requires the serialization of the class to implement the Serializable interface;

You can then use the Objectoutstream write () method output;

Deserialization: Can be entered using the Read () method of ObjectInputStream;

　Serialization and deserialization implementations are simple, but be aware that the class that implements the serializable interface cannot have instantiated objects of other classes;

That is, if the class also contains instances of other classes, then the called class also needs to implement the serializable interface.

Here's a list of the problems I'm having when I'm learning to serialize:

It is troublesome to instantiate the object of the scanner class in the class of the serializable interface, resulting in a running error;

Job Requirements:

Applies object serialization and object deserialization to the file to write to the object, and reads the object out of the input to the console.

:

Task Requirements:

1. Create the product class and declare its properties: Id,name,categories,price
2, inherit the Serializable interface;
3, define the product class construction method;
4. In the test class, create the object of the product class: Iphone,ipad,macbook,iwatch
5. Instantiate object input stream and object output stream;
6. Write four objects of the product class;
7. Read four objects of four product classes from a file.

My Code:

1 Importjava.io.Serializable;2 ImportJava.util.Scanner;3 4  Public classAppleImplementsSerializable {5     PrivateString ID;6     PrivateString name;7     PrivateString categories;8     Private DoublePrice ;9    Scanner sc = new Scanner (system.in);Ten      PublicApple (string ID, string name, string categories,DoublePrice ) { One          This. SetId (ID); A          This. SetName (name); -          This. Setcategories (categories); -          This. Setprice (price); the     } -      PublicString getId () { -         returnID; -     } +      Public voidsetId (String id) { -          This. ID =ID; +     } A      PublicString GetName () { at         returnname; -     } -      Public voidsetName (String name) { -          This. Name =name; -     } -      PublicString getcategories () { in         returncategories; -     } to      Public voidsetcategories (String categories) { +          This. Categories =categories; -     } the      Public DoubleGetPrice () { *         returnPrice ; $     }Panax Notoginseng      Public voidSetprice (DoublePrice ) { -          This. Price =Price ; the     } + @Override A      PublicString toString () { the         return"Product ID:" + id + "\ n Product Name:" + name + "\ n Product attributes:" + categories + "\ n Product Price:" + price+ "\ n"; +     } -      $}

 PackageCom.task8;ImportJava.io.FileInputStream;Importjava.io.FileNotFoundException;ImportJava.io.FileOutputStream;Importjava.io.IOException;ImportJava.io.ObjectInputStream;ImportJava.io.ObjectOutputStream;ImportJava.io.OutputStream;ImportJava.io.OutputStreamWriter; Public classFileTest4 { Public Static voidMain (string[] args) {Try{FileOutputStream fos=NewFileOutputStream ("Apple.txt"); FileInputStream FIS=NewFileInputStream ("Apple.txt"); ObjectOutputStream Obs=NewObjectOutputStream (FOS); ObjectInputStream Ois=NewObjectInputStream (FIS); Obs.writeobject (NewApple ("123", "iphone", "Telephone", 4888.0)); Obs.writeobject (NewApple ("234", "ipad", "Computer", 5088.0)); Obs.writeobject (NewApple ("345", "MacBook", "Computer", 10688.0)); Obs.writeobject (NewApple ("iwatch", "watch", 4799.0)); System.out.println ("Apple Series Product Information:");  for(inti = 0;i<4;i++) {                Try{System.out.println (Ois.readobject ()); } Catch(ClassNotFoundException e) {//TODO auto-generated Catch blockE.printstacktrace ();            }} fos.close ();            Fis.close ();            Obs.close ();        Ois.close (); } Catch(FileNotFoundException e) {//TODO auto-generated Catch blockE.printstacktrace (); } Catch(IOException e) {//TODO auto-generated Catch blockE.printstacktrace (); }    }}

Operation Result:

The important thing to say three times:

The class that implements the serializable interface cannot have instantiated objects of other classes;

The class that implements the serializable interface cannot have instantiated objects of other classes;

The class that implements the serializable interface cannot have instantiated objects of other classes;

That is, if the class also contains instances of other classes, then the called class also needs to implement the serializable interface.

Java.io.NotSerializableException