36,051 Topics
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| | I am currently making my project and it involves graphing functions. I have chosen Java because as I have surfed the net, i was able to download a library (JGraphT) that tells me that it can help me graph mathematical functions. Now, my problem is, i dont know how to … |
| | Hello everygone!! I signed up here hoping I will receive some help. I realize that every 2nd person writes: I am new...bla bla bla. I am new:)...I was sitting last 2 days trying to solve the issue and I think I am close but I don't see something. This is … |
| | I am currently working on writing a simple vending machine that dispenses just one drink, I am just a beginner at this so I would appreciate some help from this community. [CODE]package assignment1; public class VendingMachine extends java.lang.Object{ // fields java.lang.String givenDrinkName; private int givenDrinkPrice; private static final int INITIAL_BALANCE … |
| | this is my problem! I have to create a console application that asks for numbers of quarters, dimes, nickesl,and pennies. I have to use the Scanner class that read in the integer values for each coin. Calculate total values in cents. Calculate number of dollars and remaining cents. [CODE]import java.util.Scanner; …  |
| | Hi, I'm trying to set custom fonts, I can do it without problem with this code: [CODE] InputStream is = this.getClass().getResourceAsStream("/src/someFontName.ttf"); Font f=null; try { f = Font.createFont(Font.TRUETYPE_FONT,is).deriveFont(15f); } catch (FontFormatException ex) { Logger.getLogger(PanelLiquidacion.class.getName()).log(Level.SEVERE, null, ex); } catch (IOException ex) { Logger.getLogger(PanelLiquidacion.class.getName()).log(Level.SEVERE, null, ex); } txtPlace=new JTextField();txtPlace.setBounds(185,10,310,20); if(f!=null){ txtPlace.setFont(f); lblPlace.setFont(f); … |
| | I have an assignment Enhance the CashRegister class so that it keeps track of the total number of items in a sale. Count all recorded purchases and supply a method int getItemCount() that returns the number of items of the current purchase. Remember to reset the count ast the end … |
| | I have three classes. I have a main app, a Draggable class, and a creator class. I want it so that when i click on one rectangle it produces the same exact dimensions as the shape i pressed. However, the problem is that when I use mousePressed, it seems that … |
| | Hi, I have a program that generates an outputstream with XML-data. With a socket connection, I have to read multiple XML-files from the inputstream. To read only one XML-file from the inputstream is not a problem, the fact that there are more than one and I have to split up …  |
| | Hi guys (again), I have a new issue. I am trying to bubble sort my array of objects to display in alphabetical order. Here's the code: [B] Subscriber class:[/B] [CODE]package assignmentone; import java.util.Scanner; import java.util.StringTokenizer; import java.util.Random; /** * * @author Bill */ public class Subscriber { //Field declarations private … |
| | Hey everybody I really need help on a problem in a Java code. Any help would be really appreciated. The problem is to : Write a test program that prompts the user to enter a11, a12, a13, a21, a22, a23, a31, a32, a33 for a matrix and displays its inverse …  |
| | HTTP Status 500 - -------------------------------------------------------------------------------- type Exception report message description The server encountered an internal error () that prevented it from fulfilling this request. exception org.apache.jasper.JasperException: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:500) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:428) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) root cause java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 java.util.ArrayList.RangeCheck(Unknown Source) java.util.ArrayList.get(Unknown Source) com.mhub.ocs.dataaccess.MhubuserDAO.findByProperty(MhubuserDAO.java:106) com.mhub.ocs.dataaccess.MhubuserDAO.findByUsername(MhubuserDAO.java:125) com.mhub.ocs.aas.DelegateLoginAuthenticator.authenticate(DelegateLoginAuthenticator.java:25) …  |
 | using java? how i'm going to get the data in notepad. in short of file streaming? |
| | Hello I am using windows vista and the problem is that \r i.e., carriage return does not work properly on my system. When I run my java code, it inserts a new line rather than returning the carriage. Can anyone suggest a solution to this problem? |
| | [CODE] import javax.swing.JFrame; public class snake extends JFrame { public snake() { add(new Board()); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(320, 340); setLocationRelativeTo(null); setTitle("Snake"); setResizable(false); setVisible(true); } public static void main(String[] args) { new Snake(); } }[/code] This is Board.java file: [code]import java.awt.Color; import java.awt.Font; import java.awt.FontMetrics; import java.awt.Graphics; import java.awt.Image; import java.awt.Toolkit; import java.awt.event.ActionEvent; … |
| | Hi All, I was having trouble with getting my program to display all the necessary conversions. Here is a snippet of the code to help explain what I want to do: [CODE] private class CalcListener implements ActionListener{ public void actionPerformed(ActionEvent e){ String centInput, inchInput, meterInput, yardInput; double cent, inch, meter, … |
| | Ok im exhausted and just want to go to bed and this has been frustrating me for the last 45 minutes. This method needs to include a check for a 10 digit number from the acctNum and then parseInt but im just brain locked as to where to even put … |
 | So basically i've been thinking really about the different programming languages as i have been looking at computer science courses at university. A lot of the courses use java as their main programming language. It got me thinking, is Java the future of programming and if so why? I am … |
| | Hello, I want to know how to implement an authentication system. I know how to use HttpSession, but how will I ensure that an user cannot create false cookies to access protected area? Is it safe to keep the password as a session attribute? |
 | Hey guys, I have this code wherein I have 4 buttons to determine what set of values to display on my jtable. I've successfully displayed my data. After running the program, clicking a button, data is displayed in the jtable. Problem is, when I minimize/maximize the window, the data disappears. … |
| | I've often pondered over this subject. I know the main method has a special signature the JVM looks for, but why is it static? |
| | [CODE]I am planning to make an application that can graph all functions.(polynomials, rational, trigonometric,etc) but I can't make a decision on which programming language I am going to use. I am choosing between Java and VB.net. what are the ups and downs of these languages? Which one would be better … |
| | hi i put information in jtable how can i print the content of jtable? |
| | Hello frnds I need sm help for installing JAI on my computer! the file im getting from sun's site is a corrupt file! Pls Help Me! |
| | Hello ! As I wrote in the title. I'm looking for a Java command wchich is simmilar to ' tr -s" " ' in UNIX. tr -s"[sequence]" : Replace each input sequence of a repeated character that is listed in SET1 with a single occurrence of that character. thanks for … |
| | Good Evening! We recently had a project about java, and i chose to make a program that measures time. What i want is like a server in computer shops, but i dont know how to make a timer, displayed while running.. i guess it must have a loop to increment, … |
| | hi i am trying to make a CAD program that read a text file which contain a vertecises and number of triangles, which look something like this"the file" : 8 -2.0 -1.5 -0.5 2.0 -1.5 -0.5 -2.0 1.5 -0.5 2.0 1.5 -0.5 -2.0 -1.5 0.5 2.0 -1.5 0.5 -2.0 1.5 … |
| | Hello! I'm trying out an idea I had which requires me to capture the contents of a java window/Frame, much like a screenshot but without the window and menubar, just the contents rendered in java, i.e. an exact image of what is visible in the java application at the moment. …  |
| | I am starting a new project and the certain requirements will be: JSF, JPA, JMS, WebServices Rest and EJB3.1. There will be at least 4 servers. Probably this will be the division: first server for backing beans and JSF. Other two servers for EJB cluster and the last server for …  |
| | Hi, I am using eclipse: 3.4.1 and tomcat 5.5.25. I run the application on tomcat server created inside eclipse. Until 3 days back I could sunccessfully use tomcat server inside eclipse but now I get following message 'Starting Tomcat v5.5 server at localhost' has encountered a problem Server Tomcat v5.5 … |
| | Hello, I am beginner Java programmer and I would greatly appreciate help. The sections with which I need help are pointed out by comment lines. I am having a lot of difficulty with methods and I do get the basic function of them but I don't know how to implement … |
| | I am new to programming, so please accept my apologies if this question is simple. I have a class (say called Student). I want to store the name of the student (name) and the course (course) I have declared some variables in my Student class: [code] private String name = … |
| | I'm having some trouble with this section of code: [CODE] for(int i = 0; i < MAX_NUM ;i++) { subList[i].readIn(); System.out.println("\nDo you want to enter another subscriber? " + "(Y/N): "); anyMoreSub = keyboard.nextLine().toUpperCase(); if (anyMoreSub.equals("N")) { break; } } while(!isDone) { menuChoice = JOptionPane.showInputDialog("Please enter the letter for " … |
| | hi guys i am doing an applet that reads information from a website, stores it and uses it to graph the data and displays it in a very friendly way. it works perfectly fine in the viewer when i run it in eclipse but as soon as i try to … |
| | I have to do my first assignment for my java class for friday this week. So due in 3 days. I wrote the polynomial class but haven't done the driver for it yet as i don't know if my polynomial class is good. Please check and let me know if … |
| | please, i am new to java and have this project on generating a university timetable using genetic algorithm. this software is to be a GUI based software... please can any one give me ideas about how i can go about it... thanks |
| | Now this question is being written in Scala, but Scala is Java compatible. I will translate the java code into Scala. // Write a recursive function "upto" // that takes two Int parameters "start" and "end" and produces a "List[Int]" // that counts DOWN from "start" to "end" (inclusive at … |
| | Hi, I want to transfer files between 2 servers. But Not able to find any decent tutorials. Please suggest some. If there's any api...then much better. Thank You  |
| | hi gyz, i've got my first Assignment of java. first i do coding plz take a look. : /* The HelloWorldApp class implements an application that simply displays "Hello World!" to the standard output. */ public class HelloWorldApp{ public static void main(string[]args){ //Display the string.No global main System.out.println("Hello World!"); } … |
| | Hi, I have to do program that uses a for loop to traverse a linked list. I have 99% of the program done and ready to go but our professor wanted us to use a specific loop which is the loop on line 31. I don't understand what b is … |
| | Sir, I am not getting any fault in my code but the code is not executing with the demands which I have. I just want to insert values into the database using jsp ,execcuteUpdate() is not working. please help me out. [B]HTML CODE[/B] [CODE] <html> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; … |
| | I am a final year student ,I have taken up this social network as my final year project. I want to make a video conferencing social network,Much like Omegle, searched the whole internet but didin't found it Is there a way of doing it using java applets,Or through any other … |
| | In my application, I have to draw 25 images of 700*500 pixels. I am trying to use ImageIO.read() method, which is called by creating another Thread. Its taking too much time to read images. I thought since i am calling the image read functions by creating another thread my another … |
| | In the book "The Complete Reference-JAVA" by Herbert Schildt. Its written there that "In C/C++, char is an integer type that is 8 bit wide and char in JAVA is a unicode 16 bits wide." I ve understud the point but I want to ask that char in JAVA isn't … |
| | In C, array is sequence of variables. int arr[3]; if arr is 2000 then arr+1 is 2000+sizeof(int). lly arr+2 is 2000+2*sizeof(int). in that way array elements are accessed but in JAVA array elements are dynamically allocated using new. then how all others variables are accessed, means I want to ask … |
 | I have a code which works, but I need a main method. can anyone please tel me where I can put the main method, I'm still struggling with that and maybe someone can give me pointers for the future. Thanks [CODE]public class BinaryTree { BinaryTree left; BinaryTree right; int value; … |
| | Hi Guys, I have a problem which in java i have a method called turn() is there a way to count the amount of times it gets called upon, ultimately counting the amount of turns? |
| | i have two classes:parentbox and chiildbox [CODE]class parentbox { int width; int height; int length; }[/CODE] [CODE]class chiildbox { public static void main(String args[]) { parentbox babybox1= new parentbox(); parentbox babybox2=babybox1; babybox1.height=10; babybox1.length=19; babybox1.width=2; int vol; System.out.println("the vol of babybox1 is"+(babybox1.height*babybox1.length*babybox1.width)); //parentbox babybox2=babybox1; System.out.println("Now babybox2 contains:"); System.out.println("babybox2.height=",+babybox2.height); System.out.println("babybox2.length=",+babybox2.length); System.out.println("babybox2.width=",+babybox2.width); } … |
| | I've already read the stickied about "STarting java" but the thing is I am not starting java, soo my question is, what's the best book to learn core java and Java EE? and what's their difference and it would be good if you will site the books you've read regarding … |
| | [CODE]/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package schedule; /** * * @author Kix */ import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.sql.*; public class Fourth extends JFrame { static JLabel lblFaccode,lblFaculty,lblSpace,lblSpace1; static JButton btnExit; static JTable tblOne; … |
| | Hello forum vaironl here, I'm having a little bit of trouble with a school assignment which is storing up to 10 names and printing them out in the command box or just printing out the names if the user presses -1. For some reason my loop doesn't wait for the … |
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