36,051 Topics
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| | i'm having a problem with my code for evaluating postfix expressions. any comments on what's wrong on my code? [code] import java.io.*; import java.util.*; import java.util.Stack; public class Eval { private Stack<String> operatorStack; private Stack<Integer> operandStack; public int evaluate(String output) { StringTokenizer s = new StringTokenizer(output);//divides into tokens int value; …  |
| | in my application i have to use multiple databases. i am using i-batis. i wants to access multiple database instances through I-Batis. i dont want to use multiple configs. Is it possible to connect to multiple databases using same configs file in i-batis. Any help will be appreciated. Thanks ! |
| | I want to be able to create JLabels, all different names, with a for loop ex: [CODE] static JLabel[] totalAYearLabelYr = new JLabel[termYears]; [/CODE] So I got 30 JLabels named totalAYearLabelYr, which I'm not sure you can have 30 JLabels named the same thing. I wanna name them all totalAYearLabelYr1 … |
| | -List of names in a database -names have double assigned to them, x -each name has random 10 digit double generated from 0 to x -the name with the highest number double is assigned to a variable -if two names generate the same double then the name with in the …  |
| | [ICODE]I need to solve a 3x3 matrix, x,y,z of a funtion (I only have a 2x2 matrix determinant solved) I have figured out how to solve the determinant with this code and I have created another attached program that displays any size matrix I thought it might help.[/ICODE] [CODE] public … |
 | Hey guys. So I want to learn how to do a simple I/O to and from a file. I want the simplest way to do this. My teacher sent me her program but I don't think I get what she is doing and it's giving me an error. So I … |
| | I have a very simple question for someone. I am trying to get back into java programming and I downloaded the latest textpad. Can someone please provide me the link of what else I need? I am on a Windows 7 machine. |
| | Hello, I have written some java classes to generate a random network. The network is made of : 200 nodes . Each node has a maximum of 50 neighbors. What i want is to Randomly chose a node from that network and GRAPHICALLY show it with its one hop neighbors …  |
| | I created a simple [B]Node.java[/B] class, where each Node instance has an 1-id variable of type int 2-Neighborlist of type Arraylist I wrote a code that gives me a random network, made of 200 nodes, and each node can have up to 55 neighbors. [CODE]for(i=0; i <200; i++ ) // … |
| | Hi, I am new to java (normally program in perl and bash). I have an array that has X amount of rows that look like this: 2011-02-24,XXXDAO_456912 - (none) - (direct),(none),(direct),(not set),(not set),0,5447,1,3639.71,3521.86,0,0 What I need to do is take this column - XXXDAO_456912 - (none) - (direct) - and … |
| | it give an access denied<java.io.filepermission Item.txt write> error any suggestion for a simple id generator? [code]import java.applet.Applet; import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.io.*; import java.lang.*; public class Shoes extends Applet implements ActionListener, ItemListener { Font SansSerif = new Font ("SansSerif", Font.BOLD, 12); Button create = new Button("Create a … |
| | Hi guys, ran into a small problem, i can read & write anything i want to a text file as well as append to the end of the line but I cant seem to figure out how to edit a specific line. Lets say in the text file i have: … |
 | I recently came across [URL="http://www.twilio.com/"]Twilio.com[/URL] that provides API facilities to implement voice or text capabilities through the internet. They aren't the first to provide this kind of service but the capability of the API and their pricing seem to make them worth looking at for anyone who has a need … |
| | I write a simple average program, but for some reason I keep getting compiler error. I tried to check my work, but still can't find where do I do wrong. It shows the message on average = total/10, and it says something like unable to reach statement. [CODE] //test import … |
| | Hy, I'm trying to read from a xml file and save it's data in an ArrayList then a HashMap my xml file looks like this: [code] <components> <component id="door1"> <bounds> <left>10</left> <top>5</top> <width>25</width> <height>10</height> </bounds> <properties> <propertie name="allignment" value="horizontal" /> <propertie name="orientation" value="top" /> <propertie name="isOpened" value="false" /> <propertie name="isLocked" …  |
| | I hava my program working, but it will not display in the JTextArea of the GUI. I believe that I am missing a line of code. However for the life of me I just cannot figure it out. Please Help. Here is my code: Thank you for the help!!! [code]package … |
| | Hi, I'm newbie on Jython and on this forum as well. I need to create a GUI with Swing. My original code is based on Tkinter (see below, code adapted from Tony Veijalainen's [URL="http://www.daniweb.com/code/snippet283859.html"]Tkinter Info Grid by loops and tuples[/URL]). The main point is the use of mainloop() allowing the … |
| | I have a motion detection code that creates a processor for my webcam bu then I want to transmit this video stream also. I am trying to use the VideoTransmit code provided by sun. Can I be able to modify it to use the same processor as my Motion detection … |
| | Hello, I am new to Java and would like some help. I have to write a small application that converts a user inputted sentence to a string array. The string is 'cleaned' from special characters before splitted into an array (Only numbers and alphabetical characters are allowed). I have managed … |
| | i have the table with 100 records at the first time the page loading i want to display only 10 records and the more link if the link is clicked display 10 more records the records are populated from the oracle database i don't know how to use the oracle … |
| | Hey all! I am having trouble debugging my program, and after exhausting all of my options i decided to come to you guys. The assignment requires us to create our own custom linkedList class representing a polynomial, where each term is a link. I have most of it working, but … |
| | hey guys i need help with my tic tac toe program - its just the rules of the game not the graphical parts. the gameisover() method isn't working its supposed to check each row and column and diagonal to see if it has all X's or O's and it should … |
| | Hi guys, Im trying to compile this class below, but its just not working, it keeps sating 'missing return statement' int the method declaration line. Can u see to check if there is anything missing in my code or if iv done something wrong?? Thanks! public class swapping { public … |
| | Hi, I have initialized an array like this: [CODE] int[][] my_array= new int[28][28]; my_array[-6][12]=2; [/CODE] But when i assign my_array with my_array[-6][12] it is giving me error.I know the doubt is very stupid but I am very confused. I want to store values in an array which has negative as … |
| | Hi I been trying to figure out this problem for last few days but cannot find the answer. I am trying to use nested for loops to try and create a 6 character string using letters/numbers from a array. I need it so that it starts off with one character … |
| | I'm trying to create a program in Java that I have in C++. In my C++ file, I have main the main method outside of any classes. Eclipse does not seem to like this. Is this not possible in Java? Do I need to put main in a class? import … |
| | Hi i get "illegal start of expression" compiling error ZMOD.java:1295: illegal start of expression for (int j = 0; j < paramArrayOfgz.length; j++) localArrayList.add(paramArrayOfgz[j] = = paramArrayOfgz[j]); ^ 1 error Press any key to continue . . . the whole code is this [CODE] import java.io.BufferedInputStream; import java.io.File; import java.io.FileInputStream; … |
| | I've been making games for a Nintendo DS homebrew with PAlib and DevkitPro and C code for a while now but I was wondering if DS game development would be available with Java. If not the DS, what would Java be able to make games with? I know that Android … |
| | hello im having problems on how to make a column sorter for my JTable. i want to make a sorter for each column. but i dont know what to do. any advices will be glady accepted :) i've seen other tables that their column headers can be clicked to sort … |
| | Hello, I have a calculator that has a set of memory buttons that I want to store the result of a calculation in.. Here is the code: [CODE] ActionListener memPadListener = new ActionListener() { @Override public void actionPerformed(ActionEvent e) { String memOperator = e.getActionCommand(); double numForMem = 0.0; if (memOperator.equals("M+")) …  |
| | Hi, I have a project that uses 'basicplayer', a mp3 player. I can get it to work when it runs in netbeans 6.9.1, but when I build project (into jar file in dist folder), it no longer runs. I need to get the jar files that I added to project … |
| | Could anyone point me in the right direction or provide a step-by-step process to create an expression evaluator in Java using StringTokenizer, Stacks, and Recursion? It would be appreciated. The method I need help with is "public float evaluator()" Here's the current code: [CODE] import structures.Stack; import java.io.BufferedReader; import java.io.IOException; … |
| | I have imported a project in my Netbeans workspace. It asks me to Resolve missing server problem. I right clicked the project and clicked on 'Resolve missing server problem'. It asks me to Add the server which i did (Tomcat 6.0) and then it asks me to browse the location … |
| | Hi Am working on s shape inheritance hierarchy project where we are supposed to define 2d or 3d shapes then use a few examples e.g circles or spheres to calculate areas and volumes of the 2d and 3d shapes respectively. Everything is working fine it compiles and builds successfully but … |
 | Hello Guys, Im Using GridbagLayout as LayoutManager, but I am not able to place my button at top-right of my frame. I'm also attaching my current output and what i actually want to do. here's my code: [CODE]package projectilemotion; /** * * @author Taimoor */ import javax.swing.*; import java.awt.*; public … |
| | hi guys, i am trying to store a bigrams into a dictionary. but i am not sure what is the best way to do it?should i use hash table to store it?if yes, how to know whether the word for example am belong to amazing and maybe other words. thanks |
| | Hi, everyone, First of all, I wasn't sure where to put this tread so I apologize if it is in the wrong place... I am developing a web application using jsp, java and Tomcat, so I figured this is as good place as any... I am in need of help. … |
| | [code=text]jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=C:/Users/Kix/Desktop/IMPORTANT DOCS/oop/BANKSYSTEM/Accounts.mdb;DriverID=22;READONLY=false} Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at banksystem.BankDBDriver.retrieveData(BankDBDriver.java:200) at banksystem.BankSystem.actionPerformed(BankSystem.java:109) 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:6267) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) at java.awt.Component.processEvent(Component.java:6032) at java.awt.Container.processEvent(Container.java:2041) at java.awt.Component.dispatchEventImpl(Component.java:4630) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168) at java.awt.Container.dispatchEventImpl(Container.java:2085) at java.awt.Window.dispatchEventImpl(Window.java:2478) at java.awt.Component.dispatchEvent(Component.java:4460) … |
| | what are categories of each of the compile time errors and run time errors with examples for each |
| | I thought "JTree. setRootVisible(false)" would hide the root yet display its children, but it doesn't. I've even tried to expand its children but nothing shows when I hide the root. Here's the code if you need to see it. [code=java] DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("Root"); JTree projectTree = new JTree(rootNode); … |
| | i need to manage post query with images attachment for different-2 users ....so how can i manage it..... while upload any file i am having access denied error..plz tell me and send me specific link... |
| | [COLOR="Green"][B]Assume that you need to calculate a sum of large number of integers which are in a array. by using the thread class. plz i want the answer today.\\\ thank you[/B][/COLOR] |
| | jsf page: [CODE] <%@page contentType="text/html" pageEncoding="UTF-8"%> <%@taglib prefix="f" uri="http://java.sun.com/jsf/core"%> <%@taglib prefix="h" uri="http://java.sun.com/jsf/html"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <f:view> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <title>JSP Page</title> </head> <body> <h:form> <center> <br><br><br> <h:dataTable id="dt1" value="#{tableBean.perInfoAll}" var="item" bgcolor="#F1F1F1" border="10" cellpadding="5" cellspacing="3" rows="4" width="50%" dir="LTR" frame="hsides" rules="all" summary="This is a … |
| | Hi everyone, I need your help please What do i need to make my program read the next character using console.nextChar(); I've added the following: import java.util.*; static Scanner console = new Scanner(System.in); and then in the main: char ch; ch = console.nextChar(); and when i compile i get this … |
 | Hello, I've been trying recently to find out how to print out text into the screen like from keyboard, that is printing into active window, just like from keyboard port. Is there a premade package/method for that or how do I use the keyboard port? |
| | Hello, I'm creating a windows like calculator using Java, I seem to be having some problems.. It will let me calculate two numbers together e.g. 2 + 2 (It will display 4) however, if I want to do multiple calculations... e.g. 2 + 2 + * 3 It will only … |
| | I made a program which converts binary with ft pt but cant get it work, what could be wrong here? [CODE]import java.io.*; import java.util.Scanner; public class NumberConverter { public static void main(String args[])throws Exception { Scanner sc = new Scanner(System.in); System.out.print("Enter a number: "); String string_input = sc.nextLine(); double double_input … |
 | So I'm trying to define a counter in a while loop, and print it from the class: [CODE]public class odd { public static void main(String[] args) { System.out.println("Input your number"); int x = IO.readInt(); int odd = 0; int even = 0; while (x != 0) { if (x % … |
| | So I'm trying to write a program: Print a number in scientific notation with 3 significant digits (e.g., 0.000838423 = 8.34*10^4). You must define and use a module that rounds a number to a specified number of decimal places. Here is what I've got so far: [CODE]public class Sn { … |
 | hello every1, Need 1 help here in creating a .jar bookmark, I m newbie in java. I want to make a jar bookmark 4 my site. Tell me how can made thisin pc , step by step, is there is any software? |
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