I'm moving this to the Java In General (Beginner) forum.
I think what you're asking is this:
Even though java automatically assigns value for varialbles, why [does an] error occurs if the variables are printed without [first being] initialised?
Variables are given a default value if they are declared at a class level, but they are not assigned a value if they are declared locally (within a method). So you will receive an error if you try to use (for example, print) a local variable that you did not specifically assign a value to.
Check out this example to see what I'm talking about
[ January 06, 2005: Message edited by: Jessica Sant ]