36,051 Topics
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| | How do I write an event listener that displays an image when I click the upload button? so far i have [CODE] jButton1 = new javax.swing.JButton(); jButton1.setText("Upload"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } });[/CODE] and then [CODE]//the LOAD button for loading the file private void jButton1ActionPerformed(java.awt.event.ActionEvent …  |
| | [CODE] String[] names = new String[namesListSet.size()]; int[] nums = new int[namestimesSet.size()]; namesListSet.toArray(names); [B]namestimesSet.toArray(nums);[/B] for (String s : names) { System.out.print(s); } [/CODE] i'm getting an error on the bold part. getting symbol not found. |
| | [CODE]String[] myArray = {"Player 30","Player2 35"};[/CODE] This statement [CODE]Arrays.sort(scoreArray);[/CODE] will sort myArray by Letters. Output: [CODE]aPlayer 30 bPlayer 35[/CODE] Problem: Is there a way to sort myArray by numbers from highest to lowest? The output should be: [CODE]bPlayer 35 aPlayer 30[/CODE] I even tried foolish things like. [CODE]String[] myArray = …  |
 | The [COLOR="Red"]red[/COLOR] is where the problem is: Thanks for the help. [code] // The "ChoseYourStory" class. import java.awt.*; import hsa.Console; public class ChoseYourStory { static Console c; // The output console public static void main (String[] args) { c = new Console (); int move; String start = ("yes"); int … |
| | can somebody tell me what this code actually does? [CODE] int i = 0; while (i < -1) { double x = xCoordinates[i]; double y = yCoordinates[i]; long xx = getWidth() - Math.round((double) getWidth() * x / 1024.0); long yy = getHeight()- Math.round((double) getHeight() * y / 768.0); g2.translate(xx, yy); … |
| | Can someone teach me or guide me using GUI..or can some one help how to understand right away the GUI..and please give the link which can help me to learn more about GUI.. |
| | //This is the error that i have Exception in thread "main" java.lang.NullPointerException //at CardTest.main(CardTest.java:16) /** * @(#)CardTest.java * * * @Robert Coughlin * @version 1.00 2010/10/15 */ //this is the main public class CardTest { public static void main(String [] args) { Card [] randomCard=new Card[20]; for(int i= 0; i<20; …  |
| | I have this txt file containing names and scores. "[COLOR="red"]ex. Player1 35[/COLOR]". My program able to read it and store it to an Array of String. Here's my question. Is possible to separate the name and the score and store them in different Arrays? [CODE]ex. myArray = {"Player1 35","Player2 30"};[/CODE] … |
| | Hi I have a project in which I have to build an algorithm visualization tool. Up until now I have been going in a static direction thinking of having in built menus that allowed a user to create an animation of a sorting algorithms but now my tutor wants me … |
| | Why is my while statement being ignored? [B]Problem:[/B] Write a method called squareRoot that takes a double as a parameter and that returns an approximation of the square root of the parameter, using this algorithm. You may not use the built-in method Math.sqrt. As your initial guess, you should use … |
| | Hi, anyone can help me on how to connect PHPMyAdmin with java?  |
| | Hii all, Using Scanner class I am accepting an input string which serves as a password field Is it possible to mask the field while the input is being given ?? eg: This is how my output will be : Username : abcde1 Password : abcd@xyz This inputs are given … |
 | Would be possible to create "generic" sub-forum in Databases where we can place any db related stuff which doesn't fit into any of our present options?(MySQL, MS SQL, Oracle, MS Access and FileMaker Pro, Database Desing) Having something similar to Software Development sub-forum Legacy and Other Languages. Reason: Often there … |
| | Write a java program that calculates the grade point average of three course and their credit hours through, if the grade points and credit hours are as follows: COURSE/SUBJECT GRADE GRADEPOINT CREDIT HOURS Maths A 4.0 3 English composition B 3.0 2 French B+ 3.3 3 Now, if the grade … |
| | Im writing a program that will instatiate an object from another object but I have no idea how to get it to work. Here is my main code [code] public class testPurse { public static void main(String[] args) { Purse p1 = new Purse(); System.out.println(p1); p1.insert(3,0,2,1); System.out.println(p1); p1.insert(3,1,1,3); System.out.println(p1); p1.remove(3,1,0,2); … |
| | Can somebody pls explain me this error that I am getting when I try to run my web application on Tomcat. java.lang.NullPointerException business.Cart.addItem(Cart.java:27) cart.CartServlet.doGet(CartServlet.java:49) javax.servlet.http.HttpServlet.service(HttpServlet.java:617) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) The code for the Cart.java is [CODE]package business; import java.io.Serializable; import java.util.ArrayList; public class Cart implements Serializable { private ArrayList<LineItem> items; public Cart() { … |
| | here is code for my assignment. I am getting: Exception in thread "main" java.lang.NullPointerException at SortedStringList.insert(SortedStringList.java:33) at TestSortedStringList.main(TestSortedStringList.java:6) Line 33 is the "while" loop in my insert. Its supposed to be a double linked list of nodes w/string in each node, alphabetically arranged. here is the code: public class SortedStringList … |
| | [CODE] String names1 = ""; System.out.println("enter names: "); names1 = kb.next(); while (names1 != "stop") { System.out.println("enter names: "); names1 = kb.next(); namesList.add(names1); } [/CODE] everytime i type "stop," the program keeps running... |
| | Hi all, Im having issues with this program. I've looked online and seen others that have basically the same program but have issues also. My issue is a compiling error, thats one problem thats obvious to me. This program is suppose to get the user to enter grades for five … |
| | Hello Members, Does BlueJ support Networking? Can you have the main() of Client.java and Server.java running at same time? I always get this "Your program is running.You cannot start another execution......". Any help would be greatly appreciated. Thank you!! sciprog1 |
| | [code] c = new Console (); int lvl = 1; double exp = 0; int x = 1; double monsterhp; int monslvl = 1; int a = 1; while (a == 1) { int lvlup = 10 + (lvl * 40); if (exp >= lvlup) { lvl = lvl + … |
| | i want to disable the NO and CANCEL option , can you guys help me because im only a begineer of JOPTION here is ma code: btw this is my assignment in my 1st year college "compro" my teacher tell us to create a program , and my system is … |
| | Hello, I am in Object Oriented Design for C++ at the moment... The test we are having has a question on it and the professor wants us to find and know the answer before we come in for the test. The question is this: The following code out puts what … |
| | Hey!I have to make a Quiz game using arrays in java...Now,i have to create a random function such that the questions appear randomly n without any repetition?plz help... Here's the code: [code]import java.util.*; public class KBC { String questions[]; String options[][]; int answers[]; long money[]; int history[]; public KBC() { … |
| | I'm doing an assignment for a Data Structures class, and I'm supposed to to implement a binary search tree with a client side method to create the tree. I've gotten most of it running I think, based on some debugging lines I added to track which part of the code … |
| | Hi! I'm making a code right now but I don't know how to continue.....my problem is that I have to make an online shopping list...first, data will be shown to the viewer or buyer...i've done that already. next the buyer should enter the itemID then the number of pieces of … |
| | Hi! I am newbie in java program. All I want is to have a method that check the filename of the file that I want to upload, if it is correct given filename convention. |
| | I have created a Java program which scans a given folder and creates a .txt with a list of names of all the files in that folder. I want to create a table on MYSQL server on a website and fill it with the names of the files given in … |
| | I need to sort a text file that has text, whole integers and float integers. The code I have thus far is able to take the data and perform required calculations. Next I need help with sorting by last name and outputting data in a table. I was successful in … |
| | Hey there, Here's a snippet of my code. 1)I am trying to assign the value "[COLOR="Red"](votes + " : " + Str2)[/COLOR]" as an element of the String[] Results at the end of my for loop. So at the end of every loop, there is a new entry made to … |
| | Hello Members, I have two classes(A and B) which extend from a JPanel. These two JPanels are then added to a JFrame in a third class. I would like the program to be such that when I click a certain button in A, A becomes invisible and B becomes visible … |
| | Hi all, I'm really having trouble with this been going in circles for days some fresh insight would really help. Basic idea - is i have n nodes that have m ports that connect by links to other nodes each port has 1 link to an adjacent node. my idea … |
| | Hey guys, new to the forum. So sorry if i am posting this in the wrong location. To my question: I am trying to create a random password generator, and I think it's done is this way. I have made four arrays, two for the alphabet (capital letters and not), … |
| | Hey guys I'm working on a program that asks the user to enter a month and year and then prints that month's calendar page on the screen. However, to do this I created a daysBetween() method that accepts 2 dates and finds the number of days between them. So basically … |
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| | because I'm beginner user of Netbeans pls help me!. |
| | Hi! I'm creating a guessing game where I ask the user to guess a number between 1-1000. The output where the computer asks the user for a number is contained in a [I][COLOR="Green"]do loop[/COLOR][/I]. The problem I'm having is that I have a high score list and in the high … |
| | In the J2EE tutorial from sum site, it is often mentioned this term. For example, the timersession example: "Because it's a business method, setTimer is exposed to the local, no-interface view of TimerSessionBean and can be invoked by the client." Thanks. |
| | Hello everyone, I'm working on a project where I wish to find out who the instructor for a particular course is. The user is has to input the course name and course id for that course id then the script will search for the instructor. If the value returned is … |
| | Hi I have created a simple search form to search a movies database on my page using jsp and mysql, how can I make a download link after results have been extracted in a result page. Thanks for your nice reply. |
| | So i am suppose to write two methods called superPop and superPush. superPop() pops a StarLine object from the stack, sends it to System.out.print, and returns it. superPush() pushes a StarLine object onto the stack, sends it to System.out.print, and returns it. I am continuing to try new things but … |
| | Salary calculator: this program will ask for the number of hours you have worked and compute the salary including the overtime. Note: working hour over 45 is considered an overtime on this example. plss!.. give me the code. pls!.. |
| | .how would able to show monthly balance .would like to charge a fixed a fee each month .would like to charge withdrawal fee import java.awt.*; import java.awt.event.*; import javax.swing.*; class GuiAccTest extends Frame implements ActionListener { Label lab=new Label(" "); Label lab1=new Label(" "); TextField t[]=new TextField [4]; Label l[]=new … |
| | This is my homework for a Java class. I get a perfect score followed by a query as to why I didn't use a void method. The answer is I don't understand the difference. Can someone illustrate for me how it would look. I need a better grasp of this. … |
| | Hi Everybody, I am a new joinee as an Android Application Developer. Now I have a duobt that "Does the Android Application Development uses the J2ME platform, I mean can we call the Android Programming as the J2ME programmimg or the Android Programming has nothing to do with J2ME or … |
| | how would i be able to show the end of month balance using pop up window and also would like to charge a fixed a fee each month and withdrawal fee import java.awt.*; import java.awt.event.*; import javax.swing.*; class GuiAccTest extends Frame implements ActionListener { Label lab=new Label(" "); Label lab1=new … |
| | help ! how to do a simple log in program in netbeans using java database ? tnx in advance ! :D |
| | Hi All, I am creating an application in which I want to keep refreshing a jsp file and in that jsp file i need to keep calling another url of type [url]www.daniweb.com/receive.jsp?a=xxx&b=xxx[/url] and save this url in database. Here the url keeps changing in every second ie. values of a …  |
| | hello iam a student of following computer engineering in srilanka.I haven't a good knowledge about java.Can you help me to learn it from begining.O.K.Thankyou.  |
| | i need to develop a java project (UNO card game) using Graphical user interface and Database access... i dont knw how to do it... can any1 help me solve out this problem... am new to java... plz help me :) asap |
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