Write a object with ObjectOutputStream

Question

It is clear that I can't write the Test object to the file Test.dat, my question is what exactly is the reason that it will not succeed?

import java.io.*;

public class Test {

    private int a = 10;
    private double b = 7.5;
    private String m = "valu";

    public static void main(String[] args) {
        Test t = new Test();

        ObjectOutputStream output = ObjectOutputStream(new FileOutputStream("Test.dat"));
        output.writeObject(t);
        output.close();
    }
}

Exception in thread "main" java.lang.Error: Unresolved compilation problem: The method ObjectOutputStream(FileOutputStream) is undefined for the type Test at hst17.Test.main(Test.java:15) — GeenIdee
– GeenIdee, Commented Feb 27, 2015 at 17:08

Ramesh Kotha · Accepted Answer · 2015-02-27 17:14:05Z

2

Apart from new key word, you forgot to implement Serializable

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class Test implements Serializable{

    private int a = 10;
    private double b = 7.5;
    private String m = "valu";

    public static void main(String[] args) throws IOException {
        Test t = new Test();

        ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream("Test.dat"));
        output.writeObject(t);
        output.close();
    }

}

answered Feb 27, 2015 at 17:14

Ramesh Kotha

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Comments

Paul Medcraft · Accepted Answer · 2015-02-27 19:32:52Z

1

Try

ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream("Test.dat"));

You had missed the "new" so the compiler is looking for a static method rather than the constructor

edited Feb 27, 2015 at 19:32

answered Feb 27, 2015 at 17:11

Paul Medcraft

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2 Comments

GeenIdee Over a year ago

great, thank you very much. It works when I add a FileNotFoundException, IOException and the new ObjectOutputStream.

Paul Medcraft Over a year ago

Please accept an answer if someone has answered it correctly. In this case Ramesh put a bit more effort in so I won't be offended if you choose his ;-)

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