36,051 Topics
 | |
 | Hello, This is my first post on DaniWeb and will probably not be the last so I hope I'm doing this right: I'm currently working on a Sudoku Solver that allows the user to type in the name of a Sudoku text file that looks like this: 6 8 . … |
| | I'm writing Conway's game of life for a school assignment. I have a text file with coordinates of the initial locations with bacterium. All I need to know is how to tell java to compare a coordinate in the matrix to a coordinate from the file. The pairs are listed … |
| | I am doing my home work in which i have to pass values from java text field to text text file. My code of program is given below. The problem is that the program is not passing values from text field to text file. Please help me. /** * @(#)GUITest.java … |
| | Hello everybody, I have a trouble with my assignment . In my assignment, the application have to read the lists of text file before performing the another taks. I want my application run independently on any computer with JVM, so it must be read the text file in the jar … |
 | Hello, some of my Friends, and I decided to make a Media player using Java just for the fun of it. here are my Questions, #1: is it possible using Java ? or should I use a different language? #2: the process of Reading||Displaying||Viewing Video files is called ? #3: … |
| | Hello folks, I recently started learning Java and bought a book to look at some examples. When I copied this example program out of the book I get a null pointer exception. Most of the other programs worked perfectly this is the only one iv had a problem with so … |
| | Hello I am recieving error [icode]java.sql.SQLException: At least one parameter to the current statement is uninitialized.[/icode] at ConnectStudentDAO.java at [icode]ResultSet rs=ps.executeQuery();[/icode] Not sure if the xml statment or the bean variables or if ps.close() is needed [b] output [/b] [code] run: driver tableName from xml: org.apache.derby.jdbc.EmbeddedDriver in bCreatedTables: created table: … |
| | i need help, for some reason i cannot remove items that i have added to my JPanels the welcome.remove will is causing a problem [CODE]// The "RunescapeCalc" class. import java.awt.*; import hsa.Console; import javax.swing.*; import java.awt.event.*; import sun.audio.*; import java.io.FileInputStream; import java.math.*; public class Game1 extends JFrame implements ActionListener { … |
| | I cannot seem to get the array to work and display the second and third loans, only the first one displays. Here is what I need to clarify the situation. I added the array to the program and it only works for the first loan. Can someone point me in …  |
| | * At other projects it's working. I try to do in eclipse: export -> java -> Runnable Jar... but it tells me: could not find main method... [IMG]http://i43.tinypic.com/nbapux.jpg[/IMG] but in my main class I defined it it has: public static void main(String[] args) (the file is created, but when i … |
| | hi all; i always find answers for my problems here at daniweb, but this is my first time i post a question, so have mercy on me :) i have a jsp page and a huge scriptlet inside of it, the page adds new users to the application, so i … |
| | hi everyone. im currently working on a project where my scenario is that a company hired me to make programe for their company. what i need in my programe is [ICODE]I. Add/Update customers II. Add/Update products III. Add/Update salesman IV. Make transactions: Many products are sold to customers by salesman …  |
| | Hi, I want to take a character using the scanner class and then i want to find and count it in certain file i did like this char countingChar ; countingChar= scan.nextChar(); but my compiler show error at this line scan.nextChar() then i find this blog on the sun [url]http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5066699[/url] … |
| | |
| | I need to display a message like "Data has been already inserted " in a jsp If inserting data has already exits in a database table |
| | A small ferry company has just purchased a computer for its new automated ticketing system. The company director has asked you to design the new system to assign seats for each trip of the 50-seater ferry, which covers the route from Penang to Langkawi and back daily. The upper deck … |
| | Hello Daniweb. I'm new to Java, and I love learning it and want to continue learning it. I was curious about how a Java chat server could be made so I found an open source very basic one online. But the problem is when I run the server it gives … |
| | I am working on a project where I am building a student object from student java class. The student.java class specifies a method of: [code=java] public void setCourses(ArrayList<Course> courses) { this.courses = courses; } [/code] So I have built the following two methods in my main.java class file: [code=java] public … |
| | How should i handle click events of a JButton array i have frame containing 100 JButtons .I need to find out which one was pressed by the user[code]import java.awt.*; import java.awt.event.*; import java.sql.*; import javax.swing.*; public class Screen1 implements ActionListener , WindowListener { int i; JFrame scrfrm1; JLabel lblscr; JButton … |
| | Dear Friends, Please help me in getting out of the below error. I have made attachment of source file, kindly try to execute the program experience the error and guide me. D:\Tomcat 6.0\webapps\Beer-v1\WEB-INF\classes\com\example\web>javac -classpath " D:\Tomcat 6.0\lib\servlet-api.jar" BeerSelect1.java BeerSelect1.java:3: package com.example.model does not exist import com.example.model.*; ^ BeerSelect1.java:15: cannot find … |
| | Hi, I am creating a web application. In that I have multiple radio button and two button. What I want to do is-- I want to choose a radio button and according to that value if I will click the button1, I want to display a different jsp page. But …  |
| | Hi All, I have JSP and Servlet that need to "talk" to each other. Actually I need to get record from database, fill it in JSP file. I have created Servlet that does the query and gets the result. I need those results to be shown on JSP file. In … |
| | |
| | As I understand it equal hash codes in general imply a high probability of equality between objects, but they aren't perfect. But I've been told that in Java the base hash code of an Object is simply the memory address of the object, so I've assumed that Object hash codes …  |
| | I understand that this means I'm using more memory than is available to the JVM, but I'm not sure why or what to do about it. The purpose of the program is to simulate an item in a store that is being tracked with a bar code id number (or …  |
| | Hi Guys, I need some help with a permutation problem. Say I have a string, 6 characters long - "123456" - how can I generate a list of all permutations of that string, limited to 4 characters long? So basically, each permutation generated can only be 4 characters long. As … |
| | I cannot seem to get the array to work and display the second and third loans, only the first one displays. Here is what I need to clarify the situation. Can someone help me out please. Modify the mortgage program again. Remove the amortization table. This time enter 3 different … |
| | help me plz , write a java program that reads a number and verifies if it has the same value when we read it from right to left and from left to right. my program should display "having the same value so it is readable from both sides" if the … |
| | Hi all, I used [B]Timestamp[/B] data type in mysql and Date object in jsp. Now my question is how can I store system`s current Date n Time in Timestamp field using jsp? |
| | Here I have a program and I'm getting the following error ControlPanel is not abstract and does not override abstract method actionPerformed(java.awt.event.ActionEvent) in java.awt.event.ActionListener public class ControlPanel extends JPanel implements ActionListener ^ I don't fully seem to understand how the best way is to overcome this? [CODE]import java.awt.*; import javax.swing.*; … |
| | Hi I was wondering if anyone knows why I'm getting the reached end of file while parsing error. It mentions the bracket at the end of the file however when I remove it I get loads of errors. I know that I need to remove it however i dont understand … |
| | This is a code to solve a maze using A* search algorithm. When I run it, it gives me the following error: Exception in thread "main" java.lang.NullPointerException Can someone help me out? Below is all the code: [CODE] import java.util.List; import java.util.ArrayList; import java.util.Queue; import java.util.PriorityQueue; import java.util.Stack; public class … |
| | I'm making a game engine and an integral part of the game is that it populates worlds based on maps loaded from a XML file, a method "Actor load(Map<String, String> code)" in a class ActorLoader takes a map and returns an actor based on this map. When you make a … |
| | Hi!! I'm using JSP+Servlets+JavaBeans to make a simple application of inventories. I have created some beans in the servlet that contain the name of a factory , and then i want to get that data in a jsp page. Since i'm having many names of factories i named the respective … |
| | Hello Is there a way to get data from the db with ConnectStudentDAO and populate the StudentBean.java and then copy the bean over to the model (Student.java) Is this how it is done. I'm not sure how to work out the Cast error. Thanks [b]LoginInfoBean.java[/b] [code] public String loginAction(String newUser, … |
| | hi, i need to to display urdu in java midlets it is showing (?????) signs in database can someone please help me.its urgent |
| | Hello folks... I want to know how to enable an application (using Java) that it can understand Gujarati fonts? I want to store the Gujarati data and want to retrieve the data with understanding like the occurrence of a given word, replacing a given word with some other word and … |
| | can someone plz explain why each option is valid or invalid..i have no clue of waht is going on in these questions? all i can see are they are being multiplied?.. i do not understand these attributes and instances and cannot find any helpful resources either? i know in the … |
| | Hi, I need help with an Assignment that requires me to continue(inheritance) on an existing assignment that I previously did. When I run the program and choose option 4 or 5 nothing happens, it skips the rest of the loop and starts again. #This is the main code that uses … |
| | Hi, I want to know the general information about java. Is java is opensource or not? Thank you, Prem |
| | hi everyone can u please correct the errors in these codes? [CODE] // Testing the Stack class of the java.util package import java.util.*; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class StackTest extends JFrame { public StackTest() { super( "Stacks" ); Container c = getContentPane(); final JLabel status = new … |
| | Please help me out with this... Sorry, Don't know how to post in coding option. this might be hard to understand. | I just copy it and posted it.... thanks in advance. /* * To change this template, choose Tools | Templates * and open the template in the editor. … |
| | please give me a java codes to print this triangula shape using for loop........... 1 22 333 4444 55555 |
| | I recently starting learning Java, I have a pretty good grasp on C/C++ and wanted to expand my horizons. Anyway, I have being using the Headfirst Java book and recently finished the chapters on GUI. One thing that wasn't covered by the book was how to deal with child windows. … |
| | What are the pros and cons of class and object methods? Which is more concise (usually)? What kind of computations can be expressed most naturally using each style)? Explain PLZ!!!  |
| | Im trying to call the reset method within this Connect4Model class is that possible. As you can see I have made and attempt and I'm getting 33 errors. I can't exactly see where I'm going wrong. If someone can guide me and let me know where I've gone wrong that … |
| | Hi, I have some code for a program that I'm doing. Basically I'm trying to write method whereby the reset() method takes two parameters which are number of columns and number of rows. I'm doing this method whereby I have to to move all the contents of the Connect4Model constructor … |
| | I'm new to doing Java and i was wondering if anyone would happen to know why this return type error is occurring. this is the following error C:\Users\..\Desktop\Connect4Model.invalid method declaration; return type required public reset(int numCols, int numRows) [CODE]public class Connect4Model { Connect4Column [] columns; // an array of columns … |
| | OK I am writing a custom application which needs to do a limited amount of web browsing... i.e. browsing is not its main intention but yes it is ABSOLUTELY necessary for it to be able to browse the web.... I am using a JEditorPane with the HTMLEditorKit for the display … |
| | Hello, I have written a small java program that simulates a Lottery draw. I would like to generate multiple "lotto tickets" e.g 20 tickets containing 7 numbers at one time when i run the program rather than just a single ticket every time i run the program. Below is the … |
The End.