Question To what value is a variable of the String type automatically
initialized? (Core Java)
Answer The default value of an String type is null.
Question What is a task's priority and how is it used in scheduling? (Core
Java)
Answer A task's priority is an integer value that identifies the relative order in
which it should be executed with respect to other tasks. The scheduler attempts
to schedule higher priority tasks before lower priority tasks.
Question What is the range of the short type? (Core Java)
Answer The range
of the short type is -(2^15) to 2^15 - 1.
Question What is the purpose of garbage collection? (Core Java)
Answer
The purpose of garbage collection is to identify and discard objects that are no
longer needed by a program so that their resources may be reclaimed and reused.
Question How may messaging models do JMS provide for and what are
they? (JMS)
Answer JMS provide for two messaging models, publish-
andsubscribe and point-to-point queuing.
Question What information is needed to create a TCP Socket? (Networking)
Answer The Local System?s IP Address and Port Number. And the Remote
System's IPAddress and Port Number.
Question What Class.forName will do while loading drivers? (JDBC)
Answer It is used to create an instance of a driver and register it with the
DriverManager. When you have loaded a driver, it is available for making a
connection with a DBMS.
Question How to Retrieve Warnings? (JDBC)
Answer SQLWarning objects are a subclass of SQLException that deal with
database access warnings. Warnings do not stop the execution of an application,
as exceptions do; they simply alert the user that something did not happen as
planned. A warning can be reported on a Connection object, a Statement object
(including PreparedStatement and CallableStatement objects), or a ResultSet
object. Each of these classes has a getWarnings method, which you must invoke
in order to see the first warning reported on the calling object
Do'stlaringiz bilan baham: |
