36,051 Topics
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| | As the title states, I can't get the background of my JFrame window to change. I would've bet that just .setBackground(Color.RED) would've worked but no luck. Here's my code: [CODE]import javax.swing.JFrame; import javax.swing.*; import java.awt.*; public class win { public static void main(String[] args) { JFrame guiWindow = new JFrame("Calculator"); … |
| | Hi! Is it possible to dynamically update a text of items in JList? Let's say there is JList defined as follows: [CODE] list1.setModel(new AbstractListModel() { Object[] values = listOfTasks.toArray(); public int getSize() { return values.length; } public Object getElementAt(int i) { return "Task " + i; } }); [/CODE] As …  |
 | I can't figure out for the life of me why the names of the square and rectangle won't show up....can anyone help? [code] public class Square extends NamedShape implements Shape { public void Length() { System.out.printf("Please Enter Length Value: ", this.getLength()); } public Square(String name) { super(name); System.out.printf("Shape:", this.getName()); } … |
| | Hi would you be able to clarify If you use a J list selection to access one of a number of StringArrays in a class. What needs to happen. Is it the selection of an 'name' in the JList can then can act as a reference The part I am … |
| | Every time I think I am really making progress in understanding object oriented programming, I run into something that makes me have to go back and start all over again... This time its "subclassing". I believe that I understand the basics inheritance and overriding, but when I start to develop … |
| | Hi all, I want to parse the elements in my arraylist to double. May I know how to implement that? [CODE]import java.io.*; import java.util.*; public class Array2 { static ArrayList myDouble = new ArrayList(); static String[] temp; static String[][] finalTemp; static String[] arr; static int rows; public static void main(String … |
| | Hi everyone, I am having a little(lot of..) trouble figuring out how to combine a GUI I have made and the code that goes with it. I am vaugley familiar with action listener process, and I understand this is how to give functionality to buttons etc. However, the part I … |
 | Hello,I am making a website in JSP celled employee info system.In this whenever a new emp. registers in the system he is given a unique employee id. Currently in my registration page the employee himself will have to manually enter a unique id.Is there a way in which the unique … |
| | Hello gentlemen. I have a question over here. with the following piece of code i want to extract data from a document. The question is how can i assign the values [B]Sentences, Words[/B] in the Array. [CODE] String data[][]; //[files][sentences][words] public void ScanSearch() { for (int i = 0; i … |
 | This file is saved as Employee.java [CODE]// Employee.java //Employee Class with a construuctor to initialize the first name, last . public class Employee { private String FirstName; //first name for this Employee private String LastName ; //last name for this Employee private double MonthlySalary; //Monthly salary for this Employee //constructor …  |
| | [CODE]java.lang.NoClassDefFoundError: Main Caused by: java.lang.ClassNotFoundException: Main at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) Could not find the main class: Main. Program will exit. Exception in thread "main" Java Result: 1[/CODE] after i had done my system. this error message pop up and restricted me … |
| | Ok, well Ive pretty much finished my program and now all thats left is this error that keeps coming up and I dont know how or where to fix it. The error comes up under the bracket. Iam guess Iam missing a bracket at the end, but when I put … |
| | Hi all I made this animation app and I think its all correct however i get a error message which is: Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 2, Size: 2 at java.util.ArrayList.RangeCheck(Unknown Source) at java.util.ArrayList.get(Unknown Source) at Animation.getScene(Animation.java:56) at Animation.getImage(Animation.java:49) at MainAnimation.draw(MainAnimation.java:64) at MainAnimation.movieLoop(MainAnimation.java:53) at MainAnimation.run(MainAnimation.java:34) at MainAnimation.main(MainAnimation.java:10) I cant … |
| | [code]private void Search(java.awt.event.ActionEvent evt) { int rows = ((DefaultTableModel)jTable1.getModel()).getRowCount(); int index1 = 0; int index2 = 0; try { index1 = Integer.valueOf(jTextField1.getText()); index2 = Integer.valueOf(jTextField1.getText()); } catch (NumberFormatException e) { e.printStackTrace(); } if (index1 < 0 || index2 < 0 || index1 >= jTable1.getRowCount() || index2 >= jTable1.getRowCount()) { JOptionPane.showMessageDialog(jTable1, … |
| | Hi all, I have a GUI and working programs, however I need to put the program into the GUI to make it work, but im experiencing the problem that my GUI codes are all in a class and my codes are in man different classes, is there a way to … |
| | First off, yeah I know there are many codes out there for this, but how can one learn without doing. Ok So we need to write a code to see whether two words are anagrams of one another. Here is what I have, it compiles but does not work. The … |
| | [CODE] class example { public static void main(string args []) { Sysytem.out.printIn (This is a simple Java program....); } } [/CODE] I am using Windows Vista Ultimate I tried to rum this program in DOS shell...... Error 1 :Exception in thread "main" java.land.NoClassDefFoundError : example I tried to remove it...by …  |
| | HEY GUYS I'M WORKING ON A CALCULATOR USING THE SCANNER CLASS. HOWEVER THERE IS A CATCH TO IT I CAN ONLY USE ADDITION AND SUBTRACTION TO CALCULATE ANSWERS. I HAVE TO MAKE IT INTERACTIVE AND ASK THE USER WHAT FUNCTION THEY WOULD LIKE TO DO(1.ADDITION,2.SUBTRACTION,3.DIVISION,4,MULTIPLICATION) I'M GOING TO USE A … |
| | This is the sample code my proffessor posted online [CODE]import java.applet.*; import java.awt.*; public class AnAppletSubclass extends Applet { public void init() { System.err.println("Hello from AnAppletSubClass.init - the current value of n is " + n); color = Color.green; } public void paint(Graphics g) { setBackground(color); System.err.println("Hello from AnAppletSubClass.paint-- the … |
| | hey guys, i have a little problem i have got a method that removes the line of text in a file. for example if i specify a name and the name is on one of the lines in the file.txt it would remove it. what i want is that once … |
| | Hi there, i just joined this forum in hope improving my Programming skills. Currently i have a college assignmnt. It is to create a dice game "There is a little known dice game which is played with a pair of dice and has the following rules: the player keeps rolling … |
| | I need to create a large integer array but I am not able to increase its size beyond max int value. How do I create larger arrays?  |
| | Hi! I'm trying to create String array from ArrayList. This task seems to be trivial, however I have a problem because of using "interface". The code and error message are shown below. Please, give me some advices to solve this problem. Thanks! [CODE]public class Class1 { public List<myInterface> getAllTasks() { … |
| | hey everybody ... well im facing this difficulty .. i made one project .. and im not able to .. create a jar for it my project consists of the following files a package Prj that contains all the classes along with it i have 2 files.. with contain some … |
| | Hi! Does somebody know how to get the total number of MenuItems in JPopupMenu? I'm searching for something like, popupmenu1.getNumberOfMenuItems(). I need it for the FOR statement [CODE](for int i=0; i<popupmenu1.getNumberOfMenuItems(); i++) { ... } [/CODE] Thanks! |
| | [CODE] import javax.swing.*; import javax.swing.JFrame; public class Ejer1 { public static void main(String [] args){ JFrame frame = new JFrame (Box); frame.setVisible(true); frame.setSize(300,300); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JLabel label = new JLabel(); JPanel panel = new JPanel(); frame.add(panel); frame.add(label); System.out.println("*********"); System.out.printf("%s\n%s\n%s\n%s\n%s\n", "* *","* *","* *", "* *", "* *","*", "* *","* *","* *","* … |
| | Need idea for start this program.....? Consider the following Student class specification: public Student() //CONSTRUCTOR Initialized the attributes public String name () This Student’s name public String address() This Student’s address public String matric () This Student’s matric number public int creditHours () Number of credit hours this Student enrolled …  |
| | Hello Members, How do I change the code below sothat I can have the JLabel at the center of the JFrame and the two JButtons directly below the JLabel? Thank you! [CODE]import java.awt.*; import javax.swing.*; public class Layout { public static void main (String args[]) { JFrame m = new … |
| | Hi! Could someone please tell me how can I create an obejct of the Class1 shown below? Let's say I want initialize the List of subjects. I try the following code, but it doesn't work: [CODE] List<ClassInterface> myInterface; myInterface = Class1.getAllSubjects();[/CODE] Thanks! [CODE]public class Class1 { public List<ClassInteface> getAllSubjects() { … |
| | Hi! My question is about JFormDesigner plugin for Eclipse. So, I opened JFormDesigner in Eclipse, added the ActionListener to the JButton and defined a procedure to be runned after pressing this JButton. Then I pressed "Build All" and runned the form (*.jfd file) from Eclipse. However, it seems that the … |
| | hi, anyone can help with the insertion - when insert into a 2-node -> become 3-node, then if insert again in the 3-node, how it will pass/split up the parent - then, when the parent/root become the 3-node,how can it split up again? Below is what i got: [CODE]public class … |
| | There is text file with information held on it, with average rainfall per month. 1914,50.9,87,115.8,32.3,47.1,56.6,97.1,63.9,48.1,62.4,110.3,190.8 1914 being the year and the average rainfall follow it. The year goes up to 2008. I created a enumeration which has Jan-Dec (months) And I need to create a class which will store the … |
| | 1.In the Java API, the String class and all numeric wrapper classes (Number, Integer, Float...) are immutable. Name 3 other classes in the Java API whose objects are immutable. Give an example of creating a new object from each class. 2. Name 3 classes in the Java API whose objects … |
 | This code is giving minimal change from real Python class to JavaMonster with every method having setter and getter not following the PEP8 naming but capitalizedWordsFormat. When instrunctor turns his head or if you put the code in your library, you can simply remove the setter/getter lines. |
| | A little help guys i have a JButton..i wanna use it to repeat the SQL statements but with an updated value.... my JButton reads [code] if(ae.getSource()==b1) { v1=v1+2; System.out.println(v1); } [/code] v1 gets a new value everytime i click the button and the v1 is used here ...under public static … |
| | Hi all, I'm actually equating a 2D array from a class to another class. I call it using method call. However, it seems like the 2D array is empty after I equate it to another 2D array in another class. May I know where is the problem? [CODE]import java.io.*; import … |
| | anybody can say the process of jsp application and connection to the all the databases?  |
| | Hi! please help me for how can i scroll through database using JDBC on a jsp page. if i m creating 4 buttons say First,Last,Next,Previous. First button will take me to the first record of the database. Last button will take me to the last record of the database. Next … |
| | Help I'm looking to find a fix for webapps running on a tomcat with IIS6 running on it too. Why am I getting this message. HTTP Status 500 - ________________________________________ type Exception report message description The server encountered an internal error () that prevented it from fulfilling this request. exception … |
| | hello friends, can i change the port of oracle 10.i am using tomcat 6.0 and both are using same port 8080.so how could i use oracle with tomcat in windows 7.Reply plz. |
 | Please provide some links to good downloadable e-books for JSP. This collection may be helpful to all the jsp community.And please keep on adding as you comes to know about some good ones. Thanks a lot !! |
| | hey guys... my database consists of questions...for a quiz....i need to read the question so that its displayed into the JLabel... [CODE=JAVA] //package Proj; import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.sql.*; class Testpage extends JFrame implements ActionListener { public static String usr; JMenuBar mbr; JMenu File,Help; JPanel p1,p2; JLabel … |
 | I am wondering how to make the red aquare jump around in the script. This is a menu. I would like the red squareto jump around every 1 or 2 seconds (doesn't have to be exact). Right now I have it when someone moves the mouse but I woule like … |
 | I use: [ICODE]Integer.toBinaryString(number);[/ICODE] to get binary string. I want to get the sum of two binary number. how do i do? example: 0010 + 0011 = 0101! Thanks! smb help me please! |
| | Im making a simple program to for a bank (its a course exercise), but i want to know how do i save for example a costumer data like Strings...?... any suggestions, please and thank you.. |
| | For my Computer Science class, we are writing several different methods to reverse a singly linked list in Java. I cannot figure out the last way, which uses three helper methods, pointerToLast(Node n) which returns the tail node, nextToLast(Node n) which returns the second to last, and append(Node a, Node … |
| | can any body tell me what is basically JVM and for what is it used for.thanks in advance |
 | Hello! Here's the problem: After making some GUI application (NetBeans) in output directory (containing generated .jar file) also appeared a directory 'lib' with additional .jar. This jar is some extra library with classes, which path is added in manifest ("Class-Path: lib/bla.jar"). So I've used to pack my applications always intto … |
| | This is probably very simple but i'm not seeing how to do it. My GUI for a project reads objects from a flat file (substitution for database) and puts each object as an item in a jComboBox. Then if the user wants to delete one of the objects, he selects … |
| | i have written the following code, my 1st combo box getting the write data but when i have problem in the getting the data in 2nd combo box when i select from the 1st one....kindly help me....advance thnx for answering String obj =(String)jComboBox1.getSelectedItem(); res=stat.executeQuery("Select flight from main where Route="+obj); String … |
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