Java questions which don't deserve their own thread, yet.

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Java questions which don't deserve their own thread, yet.

such a nice boy: Mar 22, 2002

Contract Otter posted:

I've now gone through two courses of Java-programming in my university and while I feel I know the basics of the syntax and object orientated programming,

Don't say orientated.

# ¿ Mar 20, 2008 01:42

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# ¿ Apr 28, 2024 10:23

such a nice boy: Mar 22, 2002

Since you know the format of the student ID, you can use that as a reference point. Look for 3 numbers, a dash, two numbers, a dash, four numbers (use a regex!). Everything before that is the name. After that, you'll have two fields separated by whitespace, so that's easy to parse.

# ¿ May 23, 2008 05:20

such a nice boy: Mar 22, 2002

Phillyt posted:

What's a regex?

A "regular expression". It's a way of matching text. I googled a bit and this looked like a good page for beginners:

http://gnosis.cx/publish/programming/regular_expressions.html

and here's the Java Regex lesson:

http://java.sun.com/docs/books/tutorial/essential/regex/

Regexes are incredibly useful when trying to parse text. Every decent programming language has support for them. You need to know how to use them.

# ¿ May 23, 2008 05:58

such a nice boy: Mar 22, 2002

Phillyt posted:

I can't really figure out where to put the tokens. I have a .txt file named hello which is basically made up of entries like above but I am really bad at using tokens to scan it. Right now all I'm trying to do is check for \t delimiters. Here's my code:
code:
...
            while ((l = inputStream.readLine()) != null) 
            {
                outputStream.println(l);
            }
...

OK, so this is the core of your program. All it's doing right now is reading a line from inputStream and writing it to outputStream. What do you want it to do?

Well, you want to write the output in a standardized way. You want to be able to use something like this:

code:

outputStream.println("\"" + name + "\", <" + emailaddress + ">");

There's probably a better way to do that using some string formatting stuff but I haven't worked in Java in a while. Anyway, that line presupposes that the variables "name" and "emailaddress" have the right information in them. Let's write the code to make that true...

code:

// we're going to use a regex to find the student ID:
Pattern idpattern = Pattern.compile("\d{3}-\d{2}-\d{4}");
// then we split the original string at the student ID:
String[] items = idpattern.split(l);
String beforeID = items[0];
String afterID = items[1];
// and then you write some code here that figures out the name and address because I can't do homework for you...
String name = ????
String emailaddress = ????

Hope that helps. Use that Java Regex guide to figure out what I did with "Pattern" up there. I can't guarantee that this code compiles or works because I haven't tried it but the idea is right.

# ¿ May 23, 2008 06:10

such a nice boy: Mar 22, 2002

shodanjr_gr posted:

Yet another SWING question (i managed to hack around and get my previous one fixed :P).

Is it possible to somehow add the SAME component (meaning, the same instance of a component) to two separate containers?

No.

shodanjr_gr posted:

edit: Second question, why the heck does the JVM get "clogged up" (for lack of a better term), when it captures mouse events on a container?

I move my mouse, over my container, and some times fail to get an update on it's position. Then i wiggle it around a bit, and get about 10-15 updates together...This really kills my GUI (im changing stuff inside my container, depending on the mouse's position).

Threading stuff. It's complicated. Read this:
http://java.sun.com/products/jfc/tsc/articles/threads/threads1.html

# ¿ May 24, 2008 02:42

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Java questions which don't deserve their own thread, yet.