| --- Log opened Sun Oct 09 00:00:55 2011 |
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| 12:30 | | * gnolam starts to wonder if the NSFS has forgotten about the proceedings. |
| 12:30 | < gnolam> | Srsly. It's been two months since the conference, and they were going to publish them electronically... so WTF? |
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| 17:36 | | bob_work [NSwebIRC@Nightstar-f9f2b179.static.qwest.net] has joined #code |
| 17:37 | | * bob_work is stuck on an assignment. |
| 17:39 | < bob_work> | Java class: I have a class given to us by the instructor. It is called AirData.java, and a text file called AirData.txt. Assignment is to take the AirData.txt information and pass it into AirData classes. |
| 17:40 | < bob_work> | Now, I've done the file reader, scanner, and even broken it down to arrays to seperate the information...my problem is sending it over to the AirData classes. |
| 17:41 | < TheWatcher> | Noes AirData's constructor take any useful arguments? |
| 17:41 | < bob_work> | It takes a string, int, int |
| 17:41 | < bob_work> | My main problem I'm running into is running the for loop to send data to the class(es) I'm creating |
| 17:42 | < bob_work> | For loop creates class object by "AirData Bob = new AirData(Name, RevMiles, PassMiles)" But...it's going to create a lot of Bob's unless I can figure out how to create more than one class from the loop |
| 17:43 | < bob_work> | So this is probably a first level problem, but I'm stumped on how to make a variable name for the class object. |
| 17:43 | < bob_work> | Unless that's bad and I'm doing it all wrong. |
| 17:44 | < Namegduf> | Objects aren't "attached" to the name of the variable you use to create them. A variable just references or is the current one being worked on by that piece of code. |
| 17:44 | < Namegduf> | If you want to store them outside the loop, use a list. |
| 17:46 | <@ToxicFrog> | Also, it's not a "class object" - it's an object of type AirData (where AirData is a class). |
| 17:47 | <@ToxicFrog> | Apart from that, Namegduf has it - create a list or similar container that can hold several objects (ArrayList is a good go-to container for this sort of thing), and as you create each AirData object in the loop, stuff it into the container. |
| 17:47 | <@ToxicFrog> | When the loop completes, now you have all of your AirDatas available and can do whatever you like with them. |
| 17:48 | < bob_work> | ArrayList is part of the assignment. But they throw my brain into a spin when I try to contemplate them. I will carry on in that direction though. |
| 17:48 | < bob_work> | Thank you |
| 17:50 | < Namegduf> | Think of objects and values as anonymous things you give a name to temporarily so you can refer to them in code. |
| 17:51 | < bob_work> | I...I think I've figured it out. WOO! (expect an "crap" in a few minutes if otherwise) |
| 17:51 | < Namegduf> | That statement will create a class each time, but as soon as the reference to it from the variable disappears at the loop end, the class gets lost and will eventually be collected. |
| 17:52 | <@ToxicFrog> | Namegduf: will create an object each time. |
| 17:52 | < Namegduf> | Right, sorry. Instance of a class, an object. |
| 17:53 | <@ToxicFrog> | (the distinction is especially important in languages where classes are themselves objects and/or can be created on the fly) |
| 17:53 | <@ToxicFrog> | (although this is not, as a rule, true of Java, barring reflection tricks) |
| 17:56 | < bob_work> | makes sense. |
| 18:17 | < bob_work> | Ok, so I can get the data into an array list |
| 18:17 | < bob_work> | But I have no frakking clue what happens to it in there. |
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| 18:19 | < bob_work> | I have a (class I think) level variable created at the top of my .java class for the ArrayList variable like so: |
| 18:19 | < bob_work> | ArrayList<AirData> Bob = new ArrayList<AirData>(); |
| 18:20 | < bob_work> | In my for loop later, I have |
| 18:20 | < bob_work> | Bob.add(new AirData(Name, RevMiles, PassMiles) ); |
| 18:20 | < bob_work> | But...yeah. No idea how I would reference individual AirData objects like which Name goes with which RevMiles |
| 18:26 | | * bob_work goes for a walk and think |
| 18:37 | < Namegduf> | It's a list of AirData objects. You can access objects by index. |
| 18:38 | < Namegduf> | Look at the API for ArrayList. |
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| 18:49 | <@ToxicFrog> | bob_work: I believe the method you want is ArrayList.get(), but check the javadocs for ArrayList. |
| 18:50 | <@ToxicFrog> | Also, for iterating over everything in the ArrayList, just use a for loop: for (AirData ad: listOfAirData) { ...do stuff with ad... } |
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| 19:11 | | * bob_work gives up; decides to go play somewhere more sane...like traffic |
| 19:11 | < bob_work> | thanks guys |
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| --- Log closed Mon Oct 10 00:00:19 2011 |