36,051 Topics
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| | Is it ever acceptable to make instance variables public? If so, when? |
| | hi everybody I have a little problem I can not fill all the cells in the table that I made by java swing can anyone help me |
| | Hi Daniweb community! I started learning javascript in school, and the best way to learn is to get into it. So I found a Sudoku game online "http://iphone.janjanousek.cz/isudoku/" and download the files on to my hard drive with much success (all the scripts). The game and site is very well … |
| | Hi all, my assignement is developing an API. my API should be used by developer in 2 ways.1 is computer base developer and another 1 is web developer.im using java application.the problem is, i dont know what must i have to develop an API for web user |
| | Hello, i am develop website in jsp as per our final year project rule of college.my project is public transportation.i am creating site for it. now my problem is to create database for bus train and flight ticket reservation.. how can i create database for it and also journey table … |
| | Hi all, I am currently trying (and now wondering if) you can add multiple threads to a program to do the same job? Basically I am writing a web crawler for a search engine and it adds many URLs to an ArrayList which is used as a queue. I add … |
| | Hi! I am creating a desktop Java application using Netbeans. My task is to generate an array and than sort it (InsertSort, SelectSort, BubbleSort). My question is how do I show the value of all elements from generated array into the textfield? What i have tried to do is: [CODE] … |
| | import java.util.Scanner; public class FirstProgram { public static void main(String[]args) { Scanner input = new Scanner(System.in); int x = 3; int num1, num2, num3, num4; while (x <= 3) { System.out.println("enter a number 1,2,3>"); num1 = input.nextInt(); num2 = input.nextInt(); num3 = input.nextInt(); num4 = input.nextInt(); { if (num1 == … |
| | Hello Members, I am trying to add weights to a Graph that is implemented using JGrapht. I keep getting a NullPointerException, which I am unable to understand as all other edges seems to be added fine. I would be grateful for any help. The code so far: [CODE]import org.jgrapht.*; import … |
| | hi can anyone tell me why the netbeans ide generates a null pointer exception. here my code. for class CustomFileFilter [CODE]import java.io.File; public class CustomFileFilter extends javax.swing.filechooser.FileFilter { private String extension; private String description; public void setDescription(String description) { this.description = description; } public void setExtension(String extension) { this.extension = … |
| | I am currently writing a program in which you input a word and the program then outputs all of the different ways the characters can be moved round into anagrams. I have wrote a way of turning the command line argument into a char array using the toCharArray() now I …  |
| | I have a form in my application in which I want to validate the user inputs. It has a combo box which is populated from db table. So I have to go to the action class first to populate it(for eg: populateFormAction). Then it will go to form.jsp page. But … |
| | I'm using PrintStream, to put some text in a txt. But how do I append to the end of the file? I saw some code whilst google-ing and it had other inputbufferstream stuff in it. Does PrintStream have its own append option? |
| | hi, i have a problem comparing values in an array and how to display them sample: [code]int[] d = new int[c]; for(i=0,j=1;i<d.length;i++,j++){ d[i]=Integer.parseInt(JOptionPane.showInputDialog("Enter value : "+j)); }[/code] i don't know how to start comparing values of each index's in the array..can someone help me? thanks BTW(new to this forum):)  |
| | Hi, I have a problem related to Java servlet sessions. I don't understand why the getAttribute() function of the session object is used before setAttribute(); Here is the code: [code]Vector buylist=(Vector)session.getAttribute("Register"); if (action.equals("del")) { String del = request.getParameter("deli"); int d = (new Integer(del)).intValue(); buylist.removeElementAt(d); } session.setAttribute("Register", buylist);[/code] Thanks. |
 | hi, I have the following code and it compiles on Netbeans with no errors or warnings but when I load the applet in a browser the browser does not display all of the pictures that I got it to draw. The only picture it draws is my_gif. I have tried … |
| | I'm working on a simple program, but I help with a part of it. When I click the submit button I need the name field to be cleared and for all of the checkbox to be unchecked. I have the name field done, but I need help with unchecking all … |
| | Hello, I'm kind of new with JSP and I'm developing an school project. So far I have my web application configured to work with a database. Now I have a form that receives a user and a password, then when the user clicks enter, it calls a servlet which checks … |
| | Please help with this program! I wrote & modified this code many time but not quite find a good solution for it. Below are some error after complied. Program problem: Input: student names, student IDs, their courses and letter grades Output to a file in table layout format with: College … |
| | While coding a random Employee storer, I use Scanner, and its .nextInt(); to ask the user for the employee's contact number: [CODE] Scanner Scan = new Scanner(System.in); out.print("\nEnter Employee Contact Number:"); newEmployee.contactNumber = Scan.nextInt(); //(I have a class Employee) [/CODE] I get the error : [CODE] Enter Employee Contact Number:456645 … |
| | This code highlights all instances of keywords in a JTextPane. I don't think it is very CPU efficient (it has three loops per LINE) It splits all the lines, creates a Matcher for each keyword, and iterates through those, which consequently means slow execution with larger files. The thread is … |
| | hi everyone , m new in development field, currently doing a project for my friend on android, client based application, need help any one....  |
| | here is the error message: Exception in thread "main" java.lang.NullPointerException at DriverClass.DriverExam.questionsMissed(DriverExam.java:48) at Chapter7ALabDemo.main(Chapter7ALabDemo.java:33) program is to read a answer key txt and a student's answers txt, then the number of questions would be entered to correspond with the txt file. and here is my code in two files: [ICODE] … |
| | Hello, I want to create an application that can make selections from a webpage. I did an assignment for school and now I want to extend my program. The assignment was to parse a webpage and display the data. The webpage's exact URL was given to us. The URL was … |
| | New to Java! We have to create a "sales" 2D array and initialize it with 100.00. Then we have to up the 3rd quarter by 500.00 and then lower the 4th quarter by 50.00. I know there's something simple I'm missing, but I can't quite figure it out. Any help … |
| | Hi all, I want to ask a question about replacing specific word in a string for example I have a string of: input = a fast nope e i want to replace word "a", if I use method replace which is: input.replace("a", "hello"); the character a in fast will also … |
| | I need to write several algorithms and one is giving me trouble. The one giving me issue requires the use of recursion to produce a summation for an integer. For example summation(4)=0+1+2+3+4=10. The code I am working with is: [CODE] public long recursion(int N){ if (N <=1) return 1; else … |
| | Hi, I would like to learn the backtracking algorithm. I do some prior knowledge in algorithm. Can someone please direct me to a good website that can teach me backtracking algorithm or a video. If someone can teach me on this thread that would awesome. Thank you. P.S I was … |
| | Alright, I admit that I'm struggling a bit with Java but for the project that I'm trying to do I need to create a bunch of bank accounts and then calculate the interest and return the names of the account holders and their balance and interest, as well as the … |
| | I need to implement gregorian calendar in java Please give me ideas how to start and what to use? |
| | [CODE]if(count == 4){ qFinal.enqueue(q.peek()); if(count3 == 0){ System.out.println(qFinal); break; } else{ sort(qFinal); } } [/CODE] this code is inside a while loop, and with the break statement, it should break out of the loop right? instead i think the program also executes the sort(qFinal) method b/c after it prints qFinal … |
| | Basically I need to setup a conditional loop to have the game run up to 10 times and then have it display the results for both the computer and user. I have my display function in the works but how could i setup the loop or counter to run the … |
 | Here is experiment of how VM and Swing UI manage the sort test posted previously, instead of CPython and Tkinter. The timing is not so sweet, but at least no Java required! [CODE]K:\jython2.5.2>java -jar jython.jar swing_test.py 256000 words generated in 10.93 s Sorted in 1.68 s List prepared in 22.71 … |
| | Dear All, How can I call a javascript to my VB.Net Window Application. Apprecited for immediate attention.. |
| | i am implementing a client server arch on LAN, what's more suitable for me to use, jsp or servlets????? let there be max 4 clients for a server...... i m done wid the designing part using AJAX and embedding those in jsp pages. made the database using sql server 2008. … |
| | Hi, I have a web application that allows users to schedule a group of Emails to be sent out. I am using Quartz to do this. I've set up the quartz.properties file, coded all the back end java business logic, but I believe to get this to work on a … |
| | Hi! My problem is that i have an object that needs to be in an array however the array must not be the same size each time I create an array. I know that you would use the [ICODE]classType[] objectName={new classType(),new classType(),new classType(),etc};[/ICODE] That would only work if I had … |
| | hi! i am totally new in perl and i have a problem..i have a search maschine and after every query i call a perl script to do the jod and see the results. i want every time i run the perlscrit to be able to see a progress bar in …  |
| | My homework assignment is to do the following steps below. I am able to write steps 1,2,3, and 5. I am stuck on how to go about writing code for step 4. Can I include this step into one of my for loops or do I need to write another … |
| | I have a simple text file that I am reading the contents of in a GUI. It's a simple program that enables a user to browse the file and add to it if needed. I have this part running fine, but I'm having some difficulty reading just the first word … |
| | i am getting an error in this. basically it sorts a queue in abc order. [CODE]public class Queue2{ public static void main(String [] args){ LinkedQueue q = new LinkedQueue(); q.enqueue("d"); q.enqueue("v"); q.enqueue("b"); q.enqueue("a"); q.enqueue("d"); System.out.println(q); System.out.println("----------------"); sort(q); } public static void sort(LinkedQueue q){ LinkedQueue qFinal = new LinkedQueue(); int count … |
| | I'm having issues with basically moving the snowman itself. I know I have to repaint image in a different position, but I tried and failed. The snowman always end up having a line of color and shape following it as an aftereffect. Can anyone help me out on how to … |
| | Hello everybody, I am working on a school project now and I want to have a blinking LED. The piece of hardware we use is not familiar because it is designed by school. I have the methods to put on the led and to put off, but can't get it … |
| | I have never programmed a client / server before but I would like to create a game where objects can be passed back and forth between two players who reside on separate machines. An example object would be a game piece and the reason it would be passed is because … |
| | I was reading a bit about the JDBC, i've made a lot of programs related to JDBC, but i've never been able to understand the concept of Class.forName(). Please explain it fully, i know the basics, as what are the strings passed, what is done and all. I wanna know … |
| | Hello everybody, I try to find out how to download any file from a URL that doesn't specify. For example: [url]http://translate.google.com/translate_tts?q=Daniweb[/url] ^^This URL directs to an .mp3 file, which is the spoken text by Google Translate. I have this code already, but it helps only when I use URL with … |
| | Hey, I am having a problem figuring this out. I didn't use file I/O before this so be gentle at me :P. Here is my problem: I am writing to a file, an object Book. The constructor looks as follows: [CODE]public Book(float bookId, String bkName, String bkAuthor, int year, String … |
 | hi all! i have a saimple applet which tries to insert a text from textfield init oa table named samp.here is my code [CODE] import java.sql.Connection; import java.sql.ResultSet; import java.sql.PreparedStatement; import java.sql.DriverManager; import java.awt.*; import java.applet.*; import java.sql.*; import java.io.*; import java.awt.event.*; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; public class Appletsamp extends … |
| | Hi, im a student doing a project on attendance system.... i have problem where the text entered (username)from formA jTextField1 need to pass to FormB in order to the combo box in FormB shows(subject,course,time) that correspond to the username was entered in Forma....i have try it....but got error... Here is … |
| | Ok im lost in trying to create a button array to test them out with an if statement in the actionlistner method. I need to create 2 buttons one name "Go" and another named "Clear" for an application. In the actionlistener i then have to use an if statement to … |
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