My Computer Science discovers interesting things sometimes. Recently we were doing a little practice with Exceptions and try-catch blocks. One of our projects was to handle division by zero and not crash the program. That sounds like a ordinary project, but as it turns out, it was a more surprising than anyone would have ever [...]
Back to the old Java Grid Stone this week, but hey, it’s fun anyway. This time, it’s Matrix Multiplication. I failed to find sufficiently explained information about this horrid excuse for Java, so I want to help everyone else out.
In java, you’re typically dealing with matrices of int or double. The code I provide below [...]
If you have a 64-bit operating system, you might consider taking advantage of the 64-bit version of Java and Eclipse. Once you have installed the 64-bit Java, you’ll probably go to Eclipse.org to grab a copy of your favorite IDE. But it work right.
You’ll need a 64-bit version of Eclipse to work with your 64-bit [...]
Our favorite development tool, Eclipse, makes it slightly confusing to read files properly inside of a Java program.
To start with, I make a file as anyone would, just a quick right click in the Project Tree, then New and finally to File as in a blank file.
One would assume that a non-java would exist [...]
I encountered this error today from copying and pasting a code snippet that was from one of our PDF textbooks.
illegal character /160
After making sure that our brackets matched, methods weren’t variables, variables weren’t methods, we didn’t know what was going on. Everything looked good and clean. So we decided to do the unthinkable: we retyped [...]
Sometimes you need to use an ArrayList. It can be when you’re lazy or when you want flexibility. Eventually, you’ll want to get away from the ArrayList and use your stores objects as standard object array. Doing this isn’t very complicated but it is slightly hidden.
We’re going to pretend for a moment that we have [...]
Most methods in java have a defined accessibility. There are public, private and protected. These access modifiers are there to keep the API clean. For instance, a method might be called, getNumberOfHousesInMinnesota but there may be too much code for just one method. A programmer might split that method into sub-parts and declare the helper [...]
A regular constructor for an object is run once. It is only run when the object is created, it is initialized. All constructors are named based on the class’ name, if I have a class called Computer, my constructor’s method is also Computer. This is a normal constructor and this causes a plain vanilla initialization. [...]
Java is silly sometimes. There are times when code will work fine, or at least seem too, even when it looks wrong.
Example 1: if
For example you can end an if statement with a semi-colon. Wait, you say you’re not supposed to end those with a semi-colon? That’s right, you normally don’t. You would expect [...]