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serializing multiple objects in the same file

Posted on 2010-11-14
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Last Modified: 2012-06-21
Thanks experts for extended support..

Can some one please give a simple example of serializing multiple objects in the same file and deserializing them
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Question by:hipal
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Expert Comment

by:CEHJ
ID: 34132761
Just call oos.writeObject several times with the corresponding ois.readObject
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Author Comment

by:hipal
ID: 34132771
so what if I want to read 4th object that I wrote ?
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Accepted Solution

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CEHJ earned 500 total points
ID: 34132787
You need to read them in order. Or serialize a List and then you can access by index
import java.io.*;
public class WriteRead {
    public static void main(String[] args) throws Exception {
	ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("x.ser"));
	for(int i = 0;i < 5;i++) {	
	    oos.writeObject("" + i);
	}
	oos.close();
	ObjectInputStream ois = new ObjectInputStream(new FileInputStream("x.ser"));
	for(int i = 0;i < 5;i++) {	
	    System.out.println(ois.readObject());
	}
	ois.close();
    }
}

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Expert Comment

by:objects
ID: 34132790
add them to a ArrayList (or array) and then serialize/deserialize the list/array
that will handle reading/writing all objects in one call
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LVL 86

Expert Comment

by:CEHJ
ID: 34134989
:)
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