| 1. What scripting language can you use in the Java SE 6 platform? |
| Blank
X |
Answer (E): The Mozilla Rhino engine implements the JavaScript
technology scripting language and is available in the core Java Runtime Environment (JRE). However, the scripting API allows you to
use any scripting engine that conforms with JSR
223.
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| 2. What is the normalization of Unicode text? |
| Blank
X |
Answer (C): The Java SE 6 platform provides the public
java.text.Normalizer class, which allows you to convert
text data to common composed or decomposed forms, allowing for
accurate comparisons and searches on text. Before the Java SE 6
platform release, the Normalizer class had been hidden
in the Java platform. The class is now a public API.
|
| 3. How do you launch your host's default browser to view a
specific URL?
|
| Blank
X |
Answer (B): The Desktop API allows your program to launch
applications associated with certain file types on the host platform. The current implementation can launch a web browser, text editor, and email application.
|
4. How can I sort JTable content? |
| Blank
X |
Answer (D): A javax.swing.table.TableRowSorter wraps your existing TableModel. You can configure it to filter or sort your
JTable contents.
|
| 5. What is the correct annotation to use to export a method as a
web service operation using Java API for XML Web Services (JAX-WS), version 2.0? |
| Blank
X |
Answer (B):
The @WebMethod annotation is
used to mark a method that is exposed as a web service operation.
Note that the @WebService annotation is used to specify
that the class is a web service or that the interface defines a web
service. The programmer will likely use the @WebService
annotation in conjunction with the @WebMethod annotation. See the article "Introducing JAX-WS 2.0 With the Java SE 6 Platform, Part 1" for more information.
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| 6. In JDK 6, the JMX Monitor API now uses a thread pool to
increase performance. What is the purpose of the JMX Monitor API? |
| Blank
X |
Answer
(D): The JMX Monitor API allows an application
to sample an attribute property of an MBean periodically and send a
notification event if it passes a given threshold. It now uses a
thread pool instead of creating a thread for each monitor. Another
improvement is the ability to monitor a value within a complex type.
|
7. JDK 6 incorporates an advanced version of the SwingWorker class into core Java technology. What is
the purpose of the SwingWorker class? |
| Blank
X |
Answer (D): Since the 1998 publication of SwingWorker in the article "Threads and Swing," developers have continuously requested that it be moved into core. At the 2004 JavaOne
conference, the Desktop team presented a new version of SwingWorker that included generification, use of the
concurrency package, and PropertyChangeListener support. Much of this functionality assists with interthread
communication. The Java SE 6 platform release incorporates a similar version of SwingWorker that greatly assists
developers in processing GUI-driven functionality off the event-dispatching thread, indicating status and progress and aggregating
the results.
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|
8. What is the best Java platform to use with the upcoming release of the Microsoft Windows Vista operating system? |
Blank
X |
Answer (A): The Java SE 6 platform release works best with the latest user
interface (UI) enhancements of Windows Vista. According to a recent
blog entry by Chet Haase: "The primary delivery of Java for Vista is Java
SE 6; that release has received most of our focus during the Vista
beta release timeframe." Go to the JDK 6 Project
site to download the most recent version. The
release is pretty close to final, so it is working very well at this
point. All of the serious Windows Vista problems have been
fixed in this release for months, so it is a particularly good test
vehicle for Java technology on Vista.
|
| 9. In the Java SE 6 platform, what key tuning option(s) are
needed to achieve high performance? |
| Blank
X |
Answer (D): See the blog entry "No Tuning Required: Java SE Out-of-Box Vs. Tuned
Performance" for a comparison of out-of-box and hand-tuned
performance.
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|
10. The Java SE 6 platform delivers a technology that can greatly
improve performance by reducing unnecessary synchronization
overhead. It allows a thread to lock and unlock an object with
minimal use of atomic operations. What is this technology called?
|
| Blank
X |
Answer (B): The technique called store-free biased
locking eliminates all synchronization-related atomic operations on
uncontended object monitors. The technique supports the bulk
transfer of object ownership from one thread to another, and the
selective disabling of the optimization where unprofitable, using
epoch-based bulk rebiasing and revocation. It has been implemented
in the production version of the Java HotSpot virtual machine (VM)
and has yielded significant performance improvements on a range of
benchmarks and applications.
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