Group items matching "programming" in title, tags, annotations or url - Java Development

1More

Online Java Training - Creating threads - 0 views

shared by Merit Campus on 07 Nov 14 - No Cached

2More

Java Quote - 0 views

www.diigo.com/...rsh1 tutorial Java programming for beginners Learning online

shared by Merit Campus on 10 Nov 14 - No Cached

2More

Coding is fun - 0 views

www.diigo.com/...mg0d Learn Java programming

shared by Merit Campus on 05 Dec 14 - No Cached

2More

Life motto. Be Awesome!! - 0 views

www.diigo.com/...qhrp Java online training programming tutorial

shared by Merit Campus on 30 Oct 14 - No Cached

1More

Java programming tutorial | Learn Java - 0 views

java.meritcampus.com/...terface---defer-implementation Learning java Online training

shared by Merit Campus on 24 Oct 14 - No Cached

1More

Method Overriding - Example | Learn Java Online - 0 views

java.meritcampus.com/...d-overriding---another-example Java online training programming tutorial

shared by Merit Campus on 28 Oct 14 - No Cached

17More

JavaBlogging » What is serialVersionUID? - 2 views

www.javablogging.com/what-is-serialversionuid java Serializable serialVersionUID

shared by Rinav G on 09 Nov 10 - Cached

private static final long serialVersionUID = 1L
...

Cancel
and it is still there even after the program finished. Let’s see if we can read that file once again, this time without creating it first.
...

Cancel
Now, let’s see what happens, when we change the serialVersionUID value and try to deserialize once again our file. Change the line 2 in the class SerializeMe so that serialVersionUID contains now 2 instead of 1:
...

Cancel
...13 more annotations...
serialVersionUID = 2L;
...

Cancel
static final
...

Cancel
Exception in thread "main" java.io.InvalidClassException:
...

Cancel
As you can see, this time the deserialization didn’t go well. ObjectInputStream complained about the serialVersionUID being changed.
...

Cancel
How does he know that it changed? If serialVersinUID is static, then it should not have been serialized in the first place, and there should be no information about the previous value 1 during the deserialization, right? Well, serialVersionUID is an exception to the rule that “static fields don’t get serialized”.
...

Cancel
Moreover, if there is no serialVersionUID officially declared in the class to be serialized, compiler automatically adds it with a value generated based on the fields declared in the class.
...

Cancel
The deserialization of that object does not necessarily have to occur exactly after serialization. It can occur after a few months or on a completely different JVM
...

Cancel
there is a chance that the class declaration has changed between serialization and deserialization.
...

Cancel
It checks if the data read from the input stream is compatible with the current definition of the class.
...

Cancel
when the visibility of a field changes, the serialVersionUID changes too.
...

Cancel
sometimes you just want for some reason to forbid deserialization of old serialized objects,
...

Cancel
you might tend to write it once for every serializable class ( or have it generated by the IDE ) and forget about it. WRONG !!!
...

Cancel
If you write it once and don’t take care to update it when necessary, you loose all the merits of serialVersionUID.
...

Cancel

Rinav G on 09 Nov 10

What is serialVersionUID? What is it Used For???

<div class="cArrow"> </div><div class="cContentInner">What is serialVersionUID? What is it Used For???</div>

...

Cancel