The Cloud Wars - Is
Guitar Hero a Cloud?
Roland Judas wrote: I am
following the cloud
discussions for some
months n...
Jul. 20, 2008 04:57 PM
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Secrets Of The Masters: Core Java Job Interview Questions
JDJ Enterprise Editor Yakov Fain Offers 30 Core Java Questions You Might Expect During Job Interviews
By: Yakov Fain
Jun. 17, 2008 06:00 AM
Digg This!
For senior-level developers: ** Q21. What's the difference between a queue and a stack? A. Stacks works by last-in-first-out rule (LIFO), while queues use the FIFO rule ** Q22. You can create an abstract class that contains only abstract methods. On the other hand, you can create an interface that declares the same methods. So can you use abstract classes instead of interfaces? A. Sometimes. But your class may be a descendent of another class and in this case the interface is your only option. ** Q23. What comes to mind when you hear about a young generation in Java? A. Garbage collection. ** Q24. What comes to mind when someone mentions a shallow copy in Java? A. Object cloning. ** Q25. If you're overriding the method equals() of an object, which other method you might also consider? A. hashCode() ** Q26. You are planning to do an indexed search in a list of objects. Which of the two Java collections should you use: ArrayList or LinkedList? A. ArrayList ** Q27. How would you make a copy of an entire Java object with its state? A. Have this class implement Cloneable interface and call its method clone(). ** Q28. How can you minimize the need of garbage collection and make the memory use more effective? A. Use object pooling and weak object references. ** Q29. There are two classes: A and B. The class B need to inform a class A when some important event has happened. What Java technique would you use to implement it? A. If these classes are threads I'd consider notify() or notifyAll(). For regular classes you can use the Observer interface. ** Q30. What access level do you need to specify in the class declaration to ensure that only classes from the same directory can access it? A. You do not need to specify any access level, and Java will use a default package access level. The J2EE questions are coming soon. Stay tuned for Yakov Fain on Live SYS-CON.TV. Ask your questions to Yakov on the air! Page 2 of 2 « previous page
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The pressure is on to
keep pace with Web 2.0
entrants into the
marketplace. Rewriting is
expensive; adding AJAX
widgets results in a
complex, unmaintainable
application. Both require
you to hire scarce
JavaScript developers.
Google Web Toolkit -- the
SDK that allows you to
write 
A standard from OASIS
called Web Services for
Remote Portlets (WSRP) is
used so portlets can be
decoupled from a portal.
In part one (JDJ, Volume.
13, issue 3) of this
article, we introduced
the relevant standards
and specifications and
then demonstrated WSRP's
capabilities by co
Two of the biggest
launches in Rich Internet
Application history took
place in 2007/2008 when
Adobe launched AIR 1.0 in
February '08 and
Microsoft launched
Silverlight (September
'07). At the 6th
International AJAXWorld
RIA Conference & Expo in
October SYS-CON Events is
delighted 
On Tuesday evening Sun
issued a fourth-quarter
guidance range largely
above analysts'
estimates. The company
pre-announced that
revenue for its fiscal
fourth quarter ended June
was $3.725 billion to
$3.8 billion, with gross
margin in the 44-45%
range. Sun expects
non-GAAP profits
Brian Stevens, the Chief
Technology Officer and
Vice President of
Engineering of Red Hat,
delivered his
Virtualization Keynote
'The Future of the
Virtual Enterprise' at
SYS-CON's Virtualization
Conference & Expo 2007
West in San Francisco.
'Virtualization is the
hottest subject 
JavaScript is one of the
most interesting and
misunderstood programming
languages in common use
today. Most developers
will go their entire
careers without realizing
its full potential. It's
not often that you get a
language that supports
the feature set that
JavaScript does, whi
