35,619 Topics
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| | I have just started out with Java. I have been programing with C and C++ for some years now. I have this problem. Im not able to call a non static method belonging to the main class from the static main method. This is the code: [CODE]public class Helloworld { … |
| | Hey guys, Here's the problem I have: I am writing a server application in Java using the ServerSocket and Socket classes. I have an instance of ServerSocket which listens for connection and accepts them. The server runs a website that requires users to log in using an e-mail and a … |
| | Hi friends, I am using struts2.I have a select tag in jsp page.After submiting form to action class,again i am redirecting to same jap page. Here, In my jsp page i want to retain <s:select list="topcat_list" name="topcat_select"> options after coming back also. Is there any way.how can i do that.thnaks … |
| | OK I have a project due tonight at midnight and I know I should have posted sooner but it seemed like such simple things that I just knew I could do it on my own. I was wrong. I need your help. I have a program that essentially makes a … |
| | Hey guys, I am pretty new in using jsp. I am currently using tiles and action mappings for my project. I am just wondering if there is a way to use action mapping with <jsp:forward> or any other forward script, especially in tiles? I tried to do the following and … |
| | I'm receiving the following errors when trying to read from a file: java.io.FileNotFoundException: rates.txt (The system cannot find the file specified) at java.io.FileInputStream.open(Native Method) at java.io.FileInputStream.<init>(FileInputStream.java:120) at java.util.Scanner.<init>(Scanner.java:636) at MortgageCalculator4.submitButtonActionPerformed(MortgageCalculator4.java:187) at MortgageCalculator4.access$000(MortgageCalculator4.java:20) at MortgageCalculator4$1.actionPerformed(MortgageCalculator4.java:70) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236) at java.awt.Component.processMouseEvent(Component.java:6288) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) at java.awt.Component.processEvent(Component.java:6053) … |
 | hey there again, I am trying to build a small mechanism that lets me store product names and prices on a produktet.txt file. the file should hold lines as follows: product1 price1 product2 price2 . . productN priceN So, I built a small panel with three rows and one column. … |
| | Hi Everyone, So I just finished writing a program from my Java class,except I can't figure out how to validate the bookID. "In the Book class, you need to provide a validate method that validate weather the book id is correct. The book id should be a [B]string[/B], which contains … |
| | I have been recently working on a java project to just practice java and work on making programs for fun, but i came up upon this bug: When i use Thread.sleep on my java program, it doesent execute the line above the try-catch block where i have my Thread.sleep. heres …  |
| | How would I get a box to appear when I hover over a JLabel? The box is to explain what the label is. This is just a minor detail for the user-interface functionality of a game. So when a user hovers over a label, a box appears explaining it. |
| | Hi Can someone please let me know which classes, objects, etc I should use into to convert an image file (.png, probably) to a printable string in Java? The image will be around 100px square and I presume I could scan 1px lines into arrays, etc? I'm hoping Java has … |
 | Dear Friend..... I want to make web site that it want to plugging with facebook..... In other words, If i type & submit something,I want to publish in Facebook wall (if i can publish in selected person's walls its very worth) it like what the youtube done after some video … |
| | I was planning to start with a java speech program and went on with some research across the internet. I found that for any such program I need an API called the java Speech API. However when I wrote down import java.speech it showed no existence of any such API. … |
| | Hi, In our application there is we have made connection code on jsp page. that code working properly but if we press long time F5 key then we get Exception is as followes : - "java.sql.SQLException: ORA-00942: table or view does not exist" after that if we press one time … |
| | i have created a war file and save it in tomcat/webapps folder.this war file contains the code of the server that will read xml file and return it as table in a Jframe.i coded it in java and it is a web service where i create a war file after … |
| | [CODE] String ip = "www.google.ro"; String pingResult = ""; String pingCmd = "ping " + ip + " -c 4"; String s; try { Process p = Runtime.getRuntime().exec(pingCmd); BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream())); BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream())); // read the output from the command System.out.println("Rezultat ping:\n"); for … |
| | I am using the Comm API, i have made a small desktop app for sending sms. I cannot send sms one after the other since it gives "Port In Use Exception". I have closed the Input and output streams as well as the serial port but still it gives "Port … |
| | hi please help me to develop code for JTextField exception handling. i have 10 JTextFields out of which 2 are necessary to fill. if the user left them blank then error message will appear. [CODE]try{ text1=a.getText(); text2=b.getText(); while(a!= null && b!=null);} catch(Exception e){ System.out.println("Please write some text" +e.getMessage());} [/CODE] this … |
| | im a newbie and im learning java just week ago. I wonder how i cant make the ball bounce in one axis only (the X axis) im not good in logic:( and i want that logic to be in one event. [code]if(x<0){ ++x;//go right }else if(x>500) {--x;//go left } [/code] … |
| | hello, i ask for help if you can : i have to write algorithm detect all cycles in undirected graph , I don't know , can any one help. Thanks . |
 | Hi All, Is it possible to bind an array or a Vector with a event listener? For an example if we add an element to the Vector or remove from the Vector, can I use an event listener to track the changes? Thanks a lot in advance. Cheers..!! |
| | So I'm busy with a small website I'm able to login at the website with the help of sessions that all goes well. But I'd like to expand the website a bit more, it's a sport website where people can add players, add teams, and add matches, and those are … |
| | I am learning Java, and found a code segment as follows. [CODE]public static void displayClusters(final Collection<Cluster> clusters) { displayClusters(clusters, Integer.MAX_VALUE); } public static void displayClusters(final Collection<Cluster> clusters, int maxNumberOfDocumentsToShow) { displayClusters(clusters, maxNumberOfDocumentsToShow, ClusterDetailsFormatter.INSTANCE); } public static void displayClusters(final Collection<Cluster> clusters, int maxNumberOfDocumentsToShow, ClusterDetailsFormatter clusterDetailsFormatter) { System.out.println("\n\nCreated " + clusters.size() + … |
| | what is the Diffrence between Compare & compareTo |
| | Hello, I have a string taken as input from user. I just want to check if a particular character within that string, is part of Standard English character set or not. How do I code the IF condition for this purpose? Regards, Arvind. |
| | i hope you can modify my simple bouncing ball :( its flickering.... i dont know how to solve it. [CODE]import javax.swing.*; // For JPanel, etc. import java.awt.*; // For Graphics, etc. import java.awt.event.*; import java.awt.geom.*; // For Ellipse2D, etc. //import java.util.*; import java.io.*; import java.util.Random; public class aball extends JFrame … |
| | hello... everyone! i have included graphics over Map like a popup menu, but now i need to provide a mouse click action over the graphic. Is it possible...?? let me explain properly. i have given city details over open street maps by using graphics2D, now i need to give a …  |
| | hi everybody, i'm a student and i'm sick of going around this. lol i have to make a game of tic tac toe, and i did everything, and everything is working fine exept this. this is a method to see if there is a victory in a line, it does … |
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| | In the listener for a button in the actionPerformed(ActionEvent e) part, if you call e.getSource it returns a type object. So how can I turn that object that it returns into the original button? |
| | I have a bmi application that was written in Java via netbeans but now I am trying to convert the Java to C#, I have pasted a sample of my Java and under that what I have so far for my C#. I would be grateful for some help with … |
| | hi again, I think I installed Java 3d correctly... I can compile code, but the code won't run. this is the error I am getting: [QUOTE] # # A fatal error has been detected by the Java Runtime Environment: # # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0949c964, pid=3832, tid=3604 # # JRE … |
| | ok so i have a project for school, and i finished so the teacher wants it to read for a .dat the parameters for the java class here is what i got: [CODE]public void cargarCurso(){ try{ BufferedReader fileIn = new BufferedReader( new FileReader("c:/cursoSem2.dat")); String dataRenglon = fileIn.readLine(); while(dataRenglon !=null){ StringTokenizer … |
| | Hi I have always seen many softwares having a customized look, for example, PuTTY software has two computers icons in a network. Others, such as NetBeans IDE, when double-clicked first show some sort of a window before showing a real software environment. So I am just curious about how this … |
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| | Hi ,I am trying to implement stack with linked list ,but when I run it show up NullPointerException How can I avoid that with try and catch Thanks [CODE]public char pop() { try{ ListNode returnNode = top; top = top.next; } catch (Exception e){} return returnNode.value; }[/CODE] |
| | Hello, Can anybody help me for connection to multiple database dynamically. Its means I wann to connect the respective database by choosing of the user , Tell take an exmple we have 3 clients namely C1,C2,C3 and having respective databases namely D1,D2,D3. I want to connect the database D1 if … |
| | Hi i am trying to use Java for a video conferencing [B]web application.[/B] I am having trouble finding an appropriate framework which enables capturing webcam video in a web page. Could you help me out if you have had similar experience. I guess applets can be used but some recommended … |
 | I have a check button and I was wondering how to get the value from it. When I use this code it gives me that it is selected always, even when it is not. [CODE] public void itemStateChanged(ItemEvent e) { // TODO Auto-generated method stub JCheckBox sourceBox = ((JCheckBox)e.getSource()); wave1Invert … |
 | Hello experts! I've made a GUI that calculates the surface area and volume of several shapes based on User input of discreet information such as length, width, depth, etc. [IMG]http://i246.photobucket.com/albums/gg88/mustardy85/ScreenShotGUI.png[/IMG] _______________________________________________________________________________________________________ How do I get java to draw the shapes of images in the BLUE rectangle to the right of … |
| | Hey guys, i made a program that calculates a heat index for a area. User inputs humidity, tells actualy temeperaute. But when i compile it, it says i havea syntax error at the Scanner Input = new Scanner(System.in) line? why is that?[code]public class HeatIndexCalculator { private static final double c1 … |
| | SA : I ask if anyone can help me in this algorithm , it is suppose that this algorithm find all the cycles in given graph . but there exist a bug it return only one cycle not all : [CODE]public class Main { public boolean funcs(boolean Graph[][]){ ArrayList<ArrayList<Integer>>l=new ArrayList<ArrayList<Integer>>(); … |
| | Hello, In case anyone has used the JADE multi-agent framework: Is it possible to run a Main container on a PC and a regular container on another PC over the Internet, rather than just LAN? |
| | Ello, Does anyone know of some 3rd party libraries that can simplify working with XML through Java, because as we all know the normal SDK's libraries are terrible.. Thanks in advance! |
| | Hello, forum. My question is: how can I format my output when outputting in JTextArea. I want to have the same functionality as System.out.format has (custom spaces between values). Maybe it is possible to print PrintSream objects in JTextArea? I am currently using append(String s) method but I am not … |
| | Hi, I was wondering if someone could help me. I am using java SWT and am trying to output a list of files and its properties to the screen. I have a file browser popping up and when i select a directory and click ok it outputs the path and … |
| | [CODE]import java.io.File; import java.io.IOException; import java.io.FileOutputStream; import java.io.FileNotFoundException; import java.awt.TextArea; import java.awt.Font; import java.awt.Color; import java.awt.Image; import java.awt.Toolkit; import java.awt.Canvas; import java.awt.Graphics; import java.awt.FileDialog; import java.awt.event.*; import java.awt.image.BufferedImage; import javax.imageio.ImageIO; import javax.print.DocFlavor.URL; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JLabel; import javax.swing.JButton; import javax.swing.JTextField; import javax.swing.Timer; import javax.swing.event.MouseInputAdapter; import javax.swing.*; … |
| | I'm trying to replace values in an array while removing extra values. This is what I have, but it doesn't seem to work and I have no idea why. I'm just challenging myself to not use any Strings in my project. This will be the last step. [CODE]/** * * … |
| | Let me tell you I already got the tutorial on how to do this [url]http://db.apache.org/derby/docs/10.3/adminguide/tadminconfig814963.html[/url] But sincerely speaking I did not understood how to do any of the two methods described. Let me tell you my confusions and what I didn't understood and I am developing my project in netbeans. … |
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