Alright, I'm making a kind of receipt class where after all the data is entered it is displayed on a new JFrame. Well I use about 10 JPanels in columns starting from top to bottom, then I'll add another JPanel from top to bottom. How can I make sure that the columns are no bigger than whats in the ArrayList. Ex. ...
Hi I have a object of ArrayList and i m using as a queue. while queueing an element from it i use toString() to use its value becouse the values that are being enqueued are of type string before dequeuing i check it using isEmpty() funtion but some time this funtion returns false and controll goes to else case. and when ...
Would you be able to help me correct these errors? Thank you very much. These programs are based on the Java Swing Address Book example (http://www.beginner-java-tutorial.com/java-addressbook.html), which consists of three programs that were written by Hemanth Balaji. The Java Swing Address Book example demonstrates how to create a simple address book program using java swing and jdbc. One of the programs ...
The Code For the Ticket Class is: import java.util.ArrayList; import java.util.Iterator; public class Ticket { private int numberOfLines; private ArrayList lottoLines; public Ticket(int num) { numberOfLines = num; lottoLines = new ArrayList(numberOfLines); for(int i = 0; i < numberOfLines; i++) { lottoLines.add(new Numbers()); } } public void printTicket() { System.out.println("**************************************"); System.out.println("** **"); System.out.println("** Lotto Ticket **"); System.out.println("** **"); System.out.println("**************************************"); System.out.println("** **"); ...
You can only add Objects to Collections, not primitive types. So you need to use the wrapper class for the char type, which is the Character class. You can also use the syntax ArrayList, but this means an ArrayList of char arrays, so that's why you are getting this message. Regards, Juliano Message was edited by: JulianoAlberto
Model: Define and manage the applications data(coordinating the activities of several programmer defined classes) respond to messages from the view We have the GUI completed I just need some help getting the arraylist started to run the program. We will need to keep a count and index of all the regions created by the user and you need to be able ...
Overview My program needs to store 11 different types of data (numbered 1 through 12, skipping 5, although I may find a way to fill this gap soon). Each type of data needs to have a bunch of entries of undeterminate size (ArrayList), but I know there will always be 11 different types of data. I figured instead of having 11 ...
for(Iterator innerIter = verList.iterator(); innerIter.hasNext();) { selVer.println(innerIter.next()); } ...allList is an ArrayList of ArrayList.. i want to get the certain element which is an arrayList and put it in the verList which is of type ArrayList... ...since verList is contains the information i need, i want to print all of its details to the selVer... please help me.. thank you!
My cue is the following, Where and How can I put that classes pMove, pLgin, pAdmin, etc... ? and that classes will be a JFrame to will be contained in a big JFrame called TragamonedaFrame tf and I want to do a for for that classes for setting their bounds, actionListener, etc.
I have an ArrayList that holds calculations of the real data, and I am trying to retrieve them according to corresponding year. For example, I have selected 3 years such as 2000, 2001, 2003. I want to display each year's data in individual column. Instead I am getting the data of the 2003 and copied over to the rest of the ...
The ArrayList is compiled before the add method is called, all of these attacks extend the abstract class Attack, and all of the attack are located in the same folder as the Pikachu class. The error that the compiler gives me is Pikachu.java:148: cannot find symbol symbol : variable ThunderShock location: class Pikachu moveSet.add(ThunderShock); ^ Any ideas?
______________________________________________________ the food reservation is store in an arraylist. if i remove the food reservation no. 1, the other 2 food reservation position will move. wat am i suppose to do to let the position to stay put in the arraylist so that if i want to remove food reservation no.3, ithe arraylist will not be out of bound?
/** * If there are more than a couple of menu items, it probably makes sense to * move this functionality into a separate class. * * If you wind up with lots of actions, you may want to look into the Mediator * pattern rather than passing panelTest2 all over the place. */
Hey, i have a 2D array and need it into an ArrayList instead. How can i convert the matrix (2D array ) to an ArrayList in the program? I read some things on putting an ArrayList inside another ArrayList but those confused the hell outta me. I wouldnt know whats what and i would never be able to work like that. ...
} br.close();//the arraylist files now has each file name that containes words System.out.println(files); } catch(IOException e){} } public void GUI() { Container con; JLabel l1; JPanel top, middle, bottom; con = frame.getContentPane(); con.setLayout(new BorderLayout()); top = new JPanel(new GridLayout(1,3)); middle = new JPanel(new GridLayout(2,1)); bottom = new JPanel(new GridLayout(1,3)); top.add(new JLabel("Search for:")); top.add(text); middle.add(new JLabel("Results: ")); middle.add(new JScrollPane(display));
Hello Everyone, I'm new to Java and going over a code, what does the below line mean??? ArrayList activeObjId = new ArrayList(); when I try to implement the example using Java 1.4, it gives me a syntax error saying that parametrized types are only available if source level is 5.0. I can't switch over to java 1.5, is there any way ...
classes: Play Element Set BEES Play - contain variables such as title, playwright, and genre Element - an abstract class that play extends Set - a class with an arraylist object that it uses to store and manipulate multiple plays BEES - displays the menu and takes in all data from the keyboard aSet is a set object the problem is ...
Called in for work. Here is the input. Enter the measurements separated by spaces and a negative number to terminate your input: 42.3 50.6 41.8 36.5 28.6 40.7 48.1 48.0 45.7 39.9 31.3 30.7 40.5 40.9 51.2 38.6 35.6 22.9 33.4 46.5 41.5 43.5 41.1 38.5 44.4 -1 Enter the number of classes the histogram will have> 10 Here is the ...
I tested with a small code, and it did not as I expected, but in my bigger code something is wrong, After running a method there happens alot of changes in the datastructure( all the variables pointing to children nodes are suddenly null ). Without me setting them to null.. This kind of stuff is a big pain in yall know ...
Did I create the ArrayList of FMStations right? How should I use the loadStations method. My instructions for the main method are: main: a public static method that returns nothing and takes one parameter, an array of Strings. The design and implementation of this method is left to the student. It must produce output consistent with the samples provided below, call ...
Are the parameters for the constructor right? How do I create the right size? Is the one line of ArrayList code enough or am I missing a line? Did I call it right, is there more, or is any code wrong? I'm working on creating a deep copy, maybe I can do that.
you can't really cut down arraylist, it's pretty sparse as it is. why does it need to be "cut down" anyway? and ArrayList is still going to be in rt.jar whether you use it or not, so I don't see what benefits you think you'll be getting by basically re-inventing the wheel. only smaller. and without any curves I'm off to ...
I am not sure what IList is but assuming it is a List interface, it is generally considered good practice to code to an interface rather than an implementation. This allows the internals of the method to be hidden from the user. Later, if it is discovered that another type of List would be better, the internal implementation can be chanced ...
The code I used to use was: WorldObj = new ArrayList(); //Array of objects That doesn't work anymore. I changed it a bit and forgot exactly how it used to be, but I think that's it. It says identifier expected or something like that when I run it and I have Java release 4 the latest one for Mac. I am ...
Hmm, It seems that there is no problem about the ArrayList manipulation in your code, however, be sure that whether there is any problem about your text file or not. Examine your read method body carefully, since it implements the IO Stream manipulation. Message was edited by: samue-1 Message was edited by: samue-1
whejn we display it it shows up like a matrix. the lab is stupid cause we have to make an array l8ist act if it is a matrix. we display a set of numbers in a 3 by 5 matrix and then have to resize it to a 4x4. we cut off the end and add zeros to the bottum.
I forgot to mention that I did print out both variables. Let's say my ArrayList holds the following: Microwave id123 120.00 10 Fridge id456 250.5 5 Toaster id678 10.99 4 if for instance newProd is a Microwave, name would be equal to Microwave. The first time round both name and tempProName (which is the same as products.get(i).getProName();) hold "Microwave" and hence ...
Arraylist allows for expandable arrays. This class supports dynamic arrays that can grow as needed. After arrays are created, they cannot grow or shrink, which means you must know in advance how many elements an array will hold. However, sometimes you may not know how large an array you need. To handle this situation, collection framework has defined ArrayList class. An ...
Very quick question. Does anyone know why ArrayList.removeRange() is protected? I've checked the documentation and the source, and I don't see any potential gotchas, either documented or in the code (which seems very straightforward). It's no big deal, but it does seem mildly annoying to have to extend the class in order to make use of such a nice method. Winston ...
Yes, I did get it working with ArrayList, but only with the help of a peer. I'm still new to the Java API and haven't really learned all of the java sytax. That is why I'm asking for help. I am currently browsing through Oracle tutorials also, but I figured asking for help here wouldn't be bad either.
Suppose that the integer array list has been declared and initialized as follows: int[ ] myList = {11, 12, 13, 14, 15}; Given this array, what is the effect of calling the method myMethod (myList); if myMethod( ) is defined as: public void myMethod (int[ ]intArr) { int k = intArr.length; while (k > 1) { k--; intArr [k - 1] ...
I have no problem reading in the data (eg. a = x.nextInt() where x = Scanner) and assigning it to an index in the List, my problem comes when I must sort the names in abc order but continue to associate their respective int values with the name. Is there anyway that I can take a member of my List, and ...
Yeah you're right, it doesn't have a next, my mistake. Next() was provided in a class given to me What do you mean I can use variables? Obviously I know how to use them, but I don't understand in this context. Sorry I've been posting such simple questions ( to you at least) on here, its just I need to finish ...