36,051 Topics
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 | hye guys, can you help me to create the name for the jPanel using the netbeans? i want to create the name for jpanel. please look at this link http://netbeans.org/kb/articles/gui-functionality.html#Exercise_2b for example. i just want to give a name same at the picture "number Addition". so how to write it. …  |
| | i'd like to change my code from procedural to OOP and i've got a problem when it comes to naming methods. can somebody explain to me what's wrong with this - sort.java:36: ';' expected public static int sortAscending () { - i understand that semicolon is not needed sort.java:36: illegal …  |
| | Hi all, hope you can give me some help to edit my code. I'm unaware how to merge two arrays and allocate them to a third array(of the right size) and let's just say for the sake of things, we'll call it C. I went ahead and instead used the … |
| | I'm working on a static method that I want to use to query mysql; I'd like the option of handing a char in but I'm only seeing string or int, what if I want to use a wildcard? '_' or an int '1', anyone have a clever solution? |
| | I have this singleton class public final class MySingleton{ public static MySingleton singletonInstance; private MySingleton(){} static{ singletonInstance=new MySingleton(); } public static MySingleton getInstance(){ return singletonInstance; } } I wanted to know is there any other simpler and better way of creating a singleton instance? |
| | I'm still getting my feet wet with Java and I'm not familiar with all the custom libraries that exist; is anyone familiar with a library for working with multiple sheets of a Excel workbook? I need to pull data from a specific worksheet in the book to work with. |
| | I having a serious problem here. This is the code i wrote and i have yet run it because too many errors. I tried minimize the errors. Anyone can help me? As for now even the simple looping also shows error. If you found any other mistake, feel free to … |
 | Hi folks. I encountered a problem. My application works perfectly if i run it from netbeans. Even it works fine when i build my project and run the jar file from the netbeans(dist) folder. But when i copy the jar file to another place(or another drive) , the jar file … |
| | I have this program where when I click start, it starts painting rectangles one on top of the other by storing each rectangle created by paintComponent in an array and then displaying them on the screen. When I click stop, the animation stops. This is all fine and dandy but …  |
 | Hey everyone, I am attempting to add an array of JTextFields to one of my JPanels and for some reason i keep getting errors and the program crashes when i run it. I know i am prob making some noob mistake but this a project for my first Java class … |
| | hi friends. i need a help how to enable and disable multiple textboxes corresponding a button click belwo i will show u the image  when i click the check box i want to enable these text fields.. hw it possible please provide a sample codes or give me … |
| | I'm working on learning some basic java programming. I have a project that I've been working on dealing mostly with arrays. I have completed the objective, I'm just not sure that I did it in the most effective way possible. My question here is to see if an experienced java …  |
| | Hey guys having some troubles here with screen scraping just wondering whats causing it not to pick up the string from the webpage it throws an error. package com.lati.latifoodmenu; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLConnection; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.webkit.WebView; public … |
| | Hi folks. I am learning java from past 5 years and constantly upgrading myself and excited to know interesting classes of java. Whats your favourite class in java? Plz share if you find any new interesting inbuilt class that comes in jdk or even 3rd party is also fine. |
| | So the mission here is to have all the user input data to display to the display panel. I was able to achieve this, however instead of the info display after I click the display button the info will display after clicking on any of the radio button options. Im … |
| | I know that java.long.String is an immutable class. I need to know different ways on to how create an immutable class in java. What are the pros and cons of immutable class |
| | Hello, I just have a quick question, I have two while loops that don't quite do what I want while (e == true && num != 1) { do statement } while (e == false && num !=1) { do different statement } if (num == 1) { System.out.println(value); } … |
| | Hello, I am trying to understand what a byte array is. public class ByteArrayExample { public static void main (String args[]) { byte[] array = "1".getBytes(); System.out.println (array); } } The output of this program is : [B@44770739 Is this a hexadecimal representation? If any of the members can explain … |
| | How do I refer to a file that is in the following directory in Java web app: ***webapps/WEB-INF/myfiles/filename*** I have read that this has got to do with relative paths, but I do not understand how to do that. |
| | http://ideone.com/XRMOPI line 43 is throwing this exception and i can't figure out why //Exception in thread "main" java.util.InputMismatchException //at java.util.Scanner.throwFor(Unknown Source) //at java.util.Scanner.next(Unknown Source) //at java.util.Scanner.nextDouble(Unknown Source) //at TestC.getBusinessInfo(TestC.java:50) //at TestC.main(TestC.java:29) any help is very much appreciated |
| | running into an issue haven't seen this before where content during the encoding and decoding of an image looses byte count. I have an app taking the photo image and sending the file via: ----------------------- byte[] imageBytes = new byte[(int) imageFile.length()]; inputFile = new RandomAccessFile(imageFile, "r"); inputFile.read(imageBytes); String base64String = … |
| | I've been planning a certain program for 3 years. During these 3 years, I've let thoughts and ideas formulate, and stew, in order for me to critique them properly. I know precisely what I want this program to do. For almost every function I know what as a client I … |
| | Review for a final and I had a question... You are give a hash function h(x) = x%11 and the size of the hash table is 11. The inputs are 4371,1323,6173,4199,4344,9679,1989. What would the resulting hash table be using quadratic probing. Would I start with 4371 and then do the … |
| | So this is basically what's supposed to be the outcome of my code: > 69:hw/05/src> javac WordOccurrenceCounter.java 70:hw/05/src> java WordOccurrenceCounter Reading the book... Getting counts from a TreeMap... Enter a string ('q' to quit): wealth wealth occurred 7 times. Enter a string ('q' to quit): poverty poverty occurred 10 times. … |
| | Hi, I have a jsp file which call java class file function passing connection as a parameter all was working fine once but when i changed few code in java file and compli it complied successfully but jsp file still giving previous class function output. I am working on amezon … |
| | Hello, I am supposed to write recursive program. I have done this below, however I don't know if my understanding of recursion is correct. I believe that it is a method which calls this method inside. In my case (insertCommas). private String insertCommas(String str) { if(str.length() < 4){ return str; … |
| | Hello, For an assignment I have to implement some search algorithms in order to solve the travelling salesman problem, I understand the problem and I understand how the algorithm works, I simply don't know how to implement it (my Java isn't great) but this should really be the easy part … |
 | Hello Internet. So the task is to create our own parser for a expression calculator. For Example: Input: 3+2*1-6/3 Output: 3 Input: 3++2 Output: Invalid Expression Input: -5+2 Output: -3 Input: 5--2 Output: 7 The code [Here](http://www.technical-recipes.com/2011/a-mathematical-expression-parser-in-java/) solves a part of the problem except that it has a fixed input … |
| | I have ran into an issue when programming a plugin that is dependent on another plugin. The plugin in question has 3 different versions, all of them are incomparable with each other. Instead of writing 3 separate plugins, I would like to know which .jar file exists, and import the … |
| | Hello, I've created a Button in one form. I've to make it work like, if I click on that button it should open another JFrame Form or JPanel form which I've created as addStock.java.. I don't know how to trigger this action.. Anyone can help me? Regards, Rahul. |
| | I am trying to test [this](http://www.tutorialspoint.com/jsp/jsp_java_beans.htm) code but unfortunately I get `Can't find a method to write property 'age' of type 'int' in a bean of type 'test.StudentsBean'` error. But when I change age type to String and also its getter and setter methods it works well. Can anybody tell … |
| | I have a list of sizes ( for example : 3X1 , 4X2 and so on..) i want to check if i can put all of them in one matrix. i need to do it in a recursive way. the function I need to write is a function that get … |
| | Hello All I have an issue. created 2 java programs, a.java and b.java content of a.java: package test; import test1.*; publuc class ATEST { public static void main (String[] args) { BTEST.call(); } } content of b.java: package test1; public class BTEST { string name; void call() { . . … |
| | Hey, I'm new to this site and asking for help in general, but this prompt my teacher gave us to do makes no sense to me at all. I dont know if he is asking us to input values manually from the keyboard into the 2 dimensional array or if … |
| | hey guys , I don't understand why the outPUT is that for the code below.. can someone please explin me how it works. Thank you. class example{ public static void main (String[]args){ int i = 1,j; while (i<=3){ j=i; while(j<=4){ System.out.println(j+" "+i); j=j+2; } i=i+1; } } } HERE IS … |
| | hei, please help me. I have a project sales .. in the form of sales transactions I would add an update on caret functions texfield subtotal. caretupdate function I use to buy goods at more than one then it will be totaled automatically which will go on with new texfield … |
| | import java.awt.event.ActionListener; import javax.swing.JFrame; //This Java Program determines the weighted average //of four test scores. //import statements for the needed packages public class Assign1 extends JFrame { //declare JLabel variables as reference to label components //declare JTextField variables as reference to input/output text boxes //declare JButton variables as reference to … |
| | I'm trying to write an applet with menus but is not working I'm getting these errors: load: MenuFrame$AppletMenu.class can't be instantiated. java.lang.InstantiationException: MenuFrame$AppletMenu at java.lang.Class.newInstance0(Unknown Source) at java.lang.Class.newInstance(Unknown Source) at sun.applet.AppletPanel.createApplet(Unknown Source) at sun.applet.AppletPanel.runLoader(Unknown Source) at sun.applet.AppletPanel.run(Unknown Source) at java.lang.Thread.run(Unknown Source) could some one please explain me what is wrong. … |
| | I am doing image segmentation using region growing algorithm. I have created Region and Pixel class where each region has list of pixels. public class Region { private List<Pixel> pixelList; } Pixel class has fields like r,g,b, hue,saturation, brightness of individual pixel in image. The result of segmentation is list … |
| | I have created a csv file, and display data from database into that file, how can I add a pie chart to that file, this is the code which I made: File file = new File("C:/Users/MY TOSHIBA/Desktop/chart.CSV"); Writer output =null; output = new BufferedWriter(new FileWriter(file)); Connection con = DriverManager.getConnection("jdbc:oracle:thin:@ 127.0.0.1:1521:XE","username","password"); … |
| | ***Can you help me to write a java program to evaluate a mathematical expression written in a a Prefix Order ?? *** |
 | ***How To Search Value From Data Base and IF Data is Not Available then show a message "Data Is Unavilable" My Codes are as Follows :-*** private void Sf_Reg_search_ButtonActionPerformed(java.awt.event.ActionEvent evt) { String str2 = JOptionPane.showInputDialog(null, "Please Enter Staff Reg No: ","Enter Reg No For Search", 1); try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); con=DriverManager.getConnection("jdbc:odbc:HMS_DS","",""); … |
| | This is my assignment. I've done it 36 hours straight and I can't think properly so my program looks like kindergarden kid's program. Basically, we have to do a GUI for Pizza ordering. Everything works except for the amount. The output for amount is "0.00". I have to send it … |
| | I have a program that figures out what the total cost for gas is on trip. I now have another piece made where you enter the trip data to save it to a file. How do I make the main program call this new window so the user can enter … |
| | I am confused "HOW to make a series of numbers in reverse orDer In java" I got the basic idea but i cannot join them together ...in this program compUtter Will identify weather input is binary or decimal .i am unable to make computer identify numbers in.please help wit Java … |
| | Ok final project of semester is to make a maze with gui , i started with the disjoint class already but am a bit confused on how the walls or cells will work with disjoint sets, has in how do i go about creating them will this work? , my … |
| | I found this example online and cannot figure out why it will not work. I was wondering if anyone could help me figure out why this code does not work ive spend a few hours tinkering with it and no luck. I learn best by example and just basically need … |
| | Hello, I have a class (Buttons.java) which inherits from JButton and implements the ActionListener interface. The second file (ButtonsTest.java) creates a GridLayout of Buttons and adds them to the applet. The issue I am having is when I click on any of these buttons, the event is not registered. I … |
 | Hi I am having problems running and compiling a program with more than one class, but I am not sure how to do it in netbean, it keeps complaining. I have the 2 following files called respectively Account.java public class Account { String name; String address; double balance; } and … |
| | Hi I am having some problem understanding the do-while loop in the following program, and I was hoping for some help: import java.io.File; import static java.lang.System.out; import java.util.Scanner; class DeleteEvidence { public static void main(String args[]) { File evidence = new File("c:\\cookedBooks.txt"); Scanner keyboard = new Scanner(System.in); char reply; do … |
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