Re: ClassCastException problem with 2D float array serialization

Thomas Hawtin <>
Wed, 26 Apr 2006 20:11:28 +0100
erenay wrote:

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

FileOutputStream fout= new FileOutputStream("C:\\A.txt");
ObjectOutputStream out= new ObjectOutputStream(fout);
float[][] vocabArray = new float[voc_cnt][groupNum];
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

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?


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];
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();

Tom Hawtin
Unemployed English Java programmer

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