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Asked: 2026-05-25T16:26:36+00:00

I was going through a blog and one question came to my head. Is

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I was going through a blog and one question came to my head. Is it possible to overwrite the way ObjectOutputStream is writing.

Let’s say i am writing to a file out.dat i.e. 

ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(new File("C:\\out.dat")));
out.writeObject(o);

When i opened the file out.dat in Notepad++, i saw the binary data. Which makes sense. What if, I would like to customize the way this data is being written. Lets say i want my out.dat file in JSON format (Thats just an example, It could be any other format). What method should i overwrite to do this?

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  1. Editorial Team

    You’ll be able to do what you want by implementing Externalizable and overriding the writeExternal and readExternal methods. See http://download.oracle.com/javase/7/docs/platform/serialization/spec/output.html#3146 for details.

    Note that it will allow customizing the output of the serialization of one object, but not the format of the whole stream. You will thus find your JSON string inside other binary data.

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