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In the past I’ve been stuck using Nextel for mobile internet access. Nextel service seems to work ok, but it is very slow, has limited coverage, costs $79 per month, doesn’t support Bluetooth, requires third-party software to work with OS X. So when I had an opportunity to switch to a different carrier I went with T-mobile because they have Bluetooth phones and because they offer unlimited internet access for $20 per month when added to an existing cell phone plan.
Continue reading “Using Bluetooth and a Mobile Phone for Internet Access”
New Sun Java Programmer Test for 1.5
The new certification test for Java 1.5 (or Java 5 or Tiger) is going to be coming out as a beta soon. According to Kathy Sierra’s weblog the new test is going to avoid the complicated “puzzle” type problems and concentrate more on your ability to accomplish specific objectives with Java code. It sounds like they are using a new type of test question that lets you drag and drop code (kind of like magnetic poetry) to make the code work or behave in a specific way.
The test is also going to cover some of the new features in the Java language like generics and autoboxing and spend more time on collections.
Sun.com lists some details about the exam. The beta version has 138 questions and gives you up to 4 hours to complete it. You can register for the beta exam at Prometric’s website for $49.
If you want to take the test a a discounted price, this might be a very good way to do it.
Actual Conversation on Amtrak
I took a train from Grand Rapids to Chicago to pickup a car. This is an actual conversation that took place two seats in front of me on the ride down:
Lady: …. this is my first train experience …
Ticket Man: Well then we will make sure it is a miserable one. Can I get you anything else?
Lady: Coffee?
(They don’t serve coffee because the pots might tip over)
Ticket Man: (Sarcastically)I wish. It’s pathetic.
I wonder if this is why most of the train was empty?
Comments in Java
One of the questions I ran into when preparing for the Java Certification exam dealt with how Java handles nested comments. Since this isn’t something I usually do in my code I wasn’t sure how it worked. It turns out the results were different than I expected.
First lets look at the double slash comments. Since they mark everything to the end of a line as a comment there isn’t really any way to nest them. You can do something like this:
System.out.println("hi"); // Comments // More comments
But the “More comments” is never evaluated because the compiler simply skips the rest of the line. However with /* */ comments can be nested. First lets look at what happens when you nest // comments inside /* */ comments.
1 /* //important comment */
2 class Comment {
3 public static void main(String args[]){
4 System.out.println("test");
5 }
6 }
So what happens in this code? If the compiler sees the // and skips the rest of the line then the rest of the code will be marked as a comment because the closing */ will be skipped. This will produce a compile time error. So lets try compiling the code and see what happens.
Continue reading “Comments in Java”
Passing the Java Programmer Certification Exam
After using Java for about four years, I started wondering how well I really understood the language, so I started looking into Sun’s certification. Sun offers the following certifications:
- Sun Certified Programmer
- Sun Certified Developer
- Sun Certified Web Component Developer
- Sun Certified Business Component Developer
- Sun Certified Developer for Java Web Services
- Sun Certified Enterprise Architech
- Sun Certified Mobile Application Developer
The Programmer certification is the pre-requisite for all of the other certifications. It consists of a 61 question, two hour test taken at a Prometric testing center. You need at least a 52% to pass. At first I was surprised at such a low passing score, however it makes more sense given the complexity of the questions.
The Developer certification involves writing an actual application based on specifications from Sun. After completing the program, you take a test over your design choices. It seems the test is to make sure that you actually wrote the code yourself.
Since the Programmer certification was the only one I was eligible for, I started looking for a good study guide. Several years ago I worked through a book by McGraw-Hill when preparing for a CCNA exam. I liked the format so I was pleased when I found for the Java exam. I ordered it used from Amazon. After it arrived I noticed it was jointly written by Kathy Sierra. Kathy specialty is cognition and learning. She worked for Sun and helped develop the Java exams. She is also the creator of the Head First series of books published by O’Reilly and Java Ranch (a website dedicated to Java certification topics).
Continue reading “Passing the Java Programmer Certification Exam”