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How can I convert any Java Object into byte array? And byte array to file object

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Question: How can I convert any Java Object into byte array?

Answer: Very elegant way I found on SUN's web site:


  public static byte[] getBytes(Object obj) throws java.io.IOException{
      ByteArrayOutputStream bos = new ByteArrayOutputStream();
      ObjectOutputStream oos = new ObjectOutputStream(bos);
      byte [] data = bos.toByteArray();
      return data;

How to convert bytes[] into File object?

Please remember that " byte[]" is byte array and it is just a bunch of bytes.

convert java object to byte array

So, when we say that we want to save bytes[] into File object it means that we want to write the contents of your byte array to some file on your hard drive.

It is very easy to save your bytes to File, look at the example below, copy and paste it into your program:


String fileName;
byte [] justByteArray;
String fileName = "saveBytesToFileObject";
FileOutputStream outStream = <strong>new </strong> FileOutputStream(fileName);
outStream.write(justByteArray); out.close();

Reference: class File description in SUN's API: File

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