Myujth

I want to save some objects into a file. but I got java.io.NotSerializableException.

This is the full exception log:

java.io.NotSerializableException: main
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
 at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
 at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
 at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
 at main$FileOperator.<init>(main.java:484)
 at main.keyPressed(main.java:79)
 at processing.core.PApplet.keyPressed(PApplet.java:3056)
 at processing.core.PApplet.handleKeyEvent(PApplet.java:2931)
 at processing.core.PApplet.dequeueEvents(PApplet.java:2602)
 at processing.core.PApplet.handleDraw(PApplet.java:2440)
 at processing.awt.PSurfaceAWT$12.callDraw(PSurfaceAWT.java:1557)
 at processing.core.PSurfaceNone$AnimationThread.run(PSurfaceNone.java:313)

And I think from at main.keyPressed(main.java:79) the problem is in main at row 79, so:

 void keyPressed() 

And I have some class, for example the abstract class Shape implements Serializable and class Line extends Shape and some others what extends class Shape.

I am trying to save the objects into file like this:

import java.io.*;
import java.util.Random; 

class FileOperator
 FileOperator(int io, ArrayList<Shape> shapes)
 if(io == 0)
 try
 Random rand = new Random(); 
 rand.nextInt(40);
 String filename = "draw" + rand + ".txt";
 FileOutputStream f = new FileOutputStream(new File(filename));
 ObjectOutputStream o = new ObjectOutputStream(f);
 for(Shape s:shapes)
 o.writeObject(s);
 

 o.close();
 f.close();

 catch (FileNotFoundException e) 
 System.out.println("ERROR: File not found"); 
 catch (NotSerializableException e) 
 println("ERROR: trying to serialize: ");
 e.printStackTrace();
 catch (IOException e) 
 println("ERROR: initializing stream");
 e.printStackTrace(); 
 

 else
 //read
 
 

So I don't know but I am wondering whether I should serialize keyPressed somehow?

Or how can I resolve this exception?

It doesn't really make sense to serialize a function. You serialize instances of a class.

Your error is caused by trying to serialize an instance of a class that's not serializeable. It has nothing to do with a function not being serialized.

Trace through your code to find the class that's not serializeable, and then either mark it as serializeable or stop trying to serialize it.

It looks like your error is saying that the main class (side note: please follow standard naming conventions, classes should start with an upper-case letter) is not serializeable. Maybe you have an inner class or something?