JAVA - how to save array of Shape to file on desktop?

Question

I have array of Shape:

Shape[] myshape = new Shape[13];

How I can save it to file?

I have found some code:

String fileName = "file.test";

BufferedOutputStream bs = null;

try {
    FileOutputStream fs = new FileOutputStream(new File(fileName));
    bs = new BufferedOutputStream(fs);
    bs.write(byte_array);
    bs.close();
    bs = null;
} catch (Exception e) {
    e.printStackTrace()
}

if (bs != null) try { bs.close(); } catch (Exception e) {}

But code work only for byte array, can anyone help me?

You need to make your Shape class Serializable. See: http://stackoverflow.com/questions/447898/what-is-object-serialization/447920#447920 — Rn222, Apr 24 '13 at 13:22

score 1 · Answer 1 · edited May 23 '17 at 11:43

1

Or you can use serialization to save the whole object.

Look at the javadoc:

http://docs.oracle.com/javase/6/docs/api/java/io/Serializable.html

And here a example from stackoverflow:

serialization/deserialization mechanism

edited May 23 '17 at 11:43

Community

1
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answered Apr 24 '13 at 13:09

Kingalione

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score 1 · Answer 2 · answered Apr 24 '13 at 13:10

There are lots of options for saving objects, of which native Java serialisation is one. If you don't want to use serialisation, you could look at XStream, which will write POJOs out as XML.

The advantages are that it'll write out human-readable XML, and oyu don't have to implement particular interfaces for your objects. The disadvantage is that XML is relatively verbose.

CloudyMarble · Accepted Answer · 2013-04-24T13:50:01.500

0

Try it like this:

Shape[] myshape = new Shape[13];

// populate array

// writing array to disk
FileOutputStream f_out = new FileOutputStream("C:\myarray.data");
ObjectOutputStream obj_out = new ObjectOutputStream (f_out);
obj_out.writeObject(array);

// reading array from disk
FileInputStream f_in = new FileInputStream("C:\myarray.data");
ObjectInputStream obj_in = new ObjectInputStream (f_in);
Shape[] tmp_array = (Shape[])obj_in.readObject();

edited Apr 24 '13 at 13:50

answered Apr 24 '13 at 13:05

CloudyMarble

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Code it OK, but if i read from myarray.data to tmp_array, tmp_array is empty(NULL)... – JaLe29 Apr 24 '13 at 13:22
Thank you @JaLe29 missed the declaration. – CloudyMarble Apr 24 '13 at 14:00

score 0 · Answer 4 · answered Apr 24 '13 at 13:08

0

You have to serialize your shapes to turn them into a byte array. I don't think Shape implements serializable, so you'll to do that yourself.

answered Apr 24 '13 at 13:08

DeadlyJesus

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JAVA - how to save array of Shape to file on desktop?

4 Answers4