question on ObjectOutputStream

[money123]

Which one of the following requirements must a class meet in order to be written to a stream using ObjectOutputStream?

Choice 1

The class must implement the Serializable interface.
Choice 2

The class cannot have any fields declared as transient.
Choice 3

The class cannot contain any static fields or methods.
Choice 4

The class must provide a SerialPersistentFields array.
Choice 5

All fields and methods in the class must be declared public.

[shanePreater]

Choice 1 is needed to write an object out to an object stream.

[money123]

thankyou so much...... ....one more question is there..........

synchronized void move() throws java.io.IOException {

Additional code here

}

Referring to the sample code above, how can a method in the same class invoke move()?

Choice 1

By enclosing the call inside a "try" block followed by a "catch (java.io.IOException e)" block.
Choice 2

By enclosing the call inside a "try" block.
Choice 3

By calling wait() to obtain the object's monitor before calling move().
Choice 4

By following the call with a "catch (java.io.IOException e)" block.
Choice 5

By enclosing the call inside a "catch (java.io.IOException e)" block.

I think answer is choice 1....am i correct

[shanePreater]

The method is defining throws IOException so anything calling the method will need to either define the same throws clause or call the method with in a try / catch block where IOException is caught.

Which of the options conforms to one of the above?

[money123]

yes..i think Option 1 is correct...
thanks for clarification....

[shanePreater]

Correct and no worries glad to help.