Re: ClassCastException problem with 2D float array serialization

From:

Thomas Hawtin <usenet@tackline.plus.com>

Newsgroups:

comp.lang.java.programmer

Date:

Wed, 26 Apr 2006 20:11:28 +0100

Message-ID:

<444fd272$0$9225$ed2619ec@ptn-nntp-reader01.plus.net>

erenay wrote:

Hi, I get an "java.lang.ClassCastException: [[D" with the following
code:

FileOutputStream fout= new FileOutputStream("C:\\A.txt");
ObjectOutputStream out= new ObjectOutputStream(fout);
....
float[][] vocabArray = new float[voc_cnt][groupNum];
....
out.writeObject(vocabArray);
out.close();
....
float[][] vocabArray2 = new float[voc_cnt][groupNum];
FileInputStream fin5 = new FileInputStream("C:\\A.txt");
ObjectInputStream oin5 = new ObjectInputStream(fin5);
vocabArray2 = (float[][])(oin5.readObject()); //It gives error here
oin5.close();

What you have written appears to be fine. However, is that exactly what
you have tried, and are you sure that you wrote over your file?

Here's some complete code I wrote. Does that work for you?

import java.io.*;

class Save {
     public static void main(String[] args) throws Exception {
         OutputStream fileOut = new FileOutputStream("file.ser");
         ObjectOutputStream out = new ObjectOutputStream(fileOut);
         float[][] array = new float[10][20];
         out.writeObject(array);
         out.close();
     }
}
class Load {
     public static void main(String[] args) throws Exception {
         InputStream fileIn = new FileInputStream("file.ser");
         ObjectInputStream in = new ObjectInputStream(fileIn);
         float[][] array = (float[][])in.readObject();
         in.close();
     }
}

Tom Hawtin
--
Unemployed English Java programmer
http://jroller.com/page/tackline/