ClassCastException problem with 2D float array serialization

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erenay - 25 Apr 2006 21:08 GMT

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();

Can anybody see any problem here? I would really appreciate any help.

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Thomas Hawtin - 26 Apr 2006 20:11 GMT

> Hi, I get an "java.lang.ClassCastException: [[D" with the following
> code:
[quoted text clipped - 12 lines]
> 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

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

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erenay - 29 Apr 2006 15:05 GMT

Thank you Thomas, I've created the serialized array's File again and it
worked fine.

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Oliver Wong - 01 May 2006 21:23 GMT

> Hi, I get an "java.lang.ClassCastException: [[D" with the following
> code:
[quoted text clipped - 12 lines]
> vocabArray2 = (float[][])(oin5.readObject()); //It gives error here
> oin5.close();

You could call .getClass().getName() to find out the name of the class
of the thing that's being returned.

- Oliver

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ClassCastException problem with 2D float array serialization

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