Reading Objects from a File by using the ObjectInputStream class: The following StudentRecordReader program uses the ObjectInputStream class to read objects from a file on disk: import java.text.*; import java.io.*; /** * StudentRecordReader.java * This program illustrates how to use the ObjectInputStream class for reading * objects from a file. I can see two solutions for you. When file pointer is at the end of the file and you try to read from ObjectInputStream the EOFException is thrown. The definition of readObject() on ObjectInputStream doesn't specify that it will return null when the end of stream is reached. Instead an exception is thrown if you attempt to read an additional object beyond the end of the file.
- Java Bufferedreader End Of File
- Java Objectinputstream End Of File File
- Java Objectinputstream End Of Files
Java object serialization and deserialization is a neat feature of the SE platform that makes it easy to read and write instances of your JavaBeans to the file-system or across a network. https://powerfulsx.weebly.com/hormone-imbalance-vegan-diet.html. In this ObjectInputStream and ObjectOutputStream example, we provide a quick tutorial to get you started with Java serialization. Avoid ObjectInputStream.readObject() from throwing EOFException at End Of File in java You are here: Home / Core Java Tutorials / Serialization And Deserialization Tutorial in java Before going into this post I’ll strongly recommend you to have knowledge of how objects are Serialized and DeSerialized in java.
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Active6 years, 3 months ago
I'm doing a schedule book, and I'm saving a .txt all my objects, that works fine, the problem comes when I read them, my program reads , when the end of the file comes, my program doesn't know what to do, I won't put my code because it's a mess right now, but here's my teacher's code, which is the one that I'm using as a template to do mine:
As you can see, the catch exception it's empty, so, when i use my teacher's code, it looks like it's working flawlessly, but, i put a println there, and it always prints it. Meaning that something's wrong, and i'm pretty sure that is the
bacause Netbeans says that this expression is never null. So i'm guessing that the program doesn't know what to do after he reaches the end of the file.. Any sugestions pals? Thanks in an advance!
Here is the exception:
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3 Answers
That exception means that you reached the end of the file, but you still ask for more objects to be read. The program can't read any more, because it has reached the end of the file, so the exception is thrown.
How to program a bmw key e60. As mentioned before, you should handle your resources more carefully. Fax server software open source windows.
You should catch the exception and handle it naturally.
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![Java Java](/uploads/1/2/6/1/126131364/977045646.jpg)
ObjectInputStream.readObject()
throws EOFException
when the end of the stream is reached. Your loop should be of the form while (true)
or for (;;)
and it should contain a catch (EOFException exc)
block which breaks out of the loop.Testing
user207421while (fileIn != null)
is entirely futile.Java Bufferedreader End Of File
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The while loop is completely incorrect
If your input file exists, then
fileIn
will always be non-null. You should check if fileIn
is null immediately after constructing it, however, in case the file path is wrong.Without the while loop, you are then just reading one object from the stream. Fight night champion keygen crack free. Whether this is correct or not, I don't know. However, one should generally know how many objects were written to the stream so that the corresponding number of objects can be read back.
(You could read until you get an
EOFException
, however I wouldn't personally condone that. I'd suggest you instead stored a container object with a number of sub-objects. An EOFException
may be thrown for reasons other than because the last object has been read successfully. However, I appreciate you may be forced to code this way to complete your assignment).Finally, you need to ensure your input streams are closed, even if an exception occurs. If you are using Java 7, the try-with-resources construct can make this easier.
Duncan JonesDuncan JonesJava Objectinputstream End Of File File
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