36,051 Topics
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| | Problem while running program: java.lang.NoSuchMethodError: main Exception in thread "main" My code is: [CODE] import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Plane extends JApplet implements ActionListener { JTextField input; JLabel prompt; JButton yesButton,noButton; int section, firstClass,economyClass; boolean seats[]; boolean questionPosed= false; public void main( String args[] ) { prompt … |
| | Can someone help me figure out what I am doing wrong here. I think I may be running my head into this way to many times to see what is wrong with it. The error code is posted below. [CODE] import java.util.Scanner; public class userName { /** * @param args … |
| | my problem comes up with the code is creating an envelope it keeps saying that envelope can not be resolved to a variable any idea on how to fix this? [CODE]import java.io.*; import java.net.*; import java.awt.*; import java.awt.event.*; /* $Id: MailClient.java,v 1.7 1999/07/22 12:07:30 kangasha Exp $ */ * A …  |
 | I have this code, when run, it is terribly unorganized. It looks like this: [Label Here] [Button Here] [-----TextField Here ----] [invisible Label][Button] my program does this: when something is entered in the JTextField and then you click the [Button Here] then it prints what you printed in the [invisible … |
| | [CODE]//Created by //Ticket Reservation System of 5 first class and 5 economy tickets import java.util.Scanner; public class Planeticket { public static void main(String args[]) { boolean EconArray[] = new boolean[5]; // boolean array with 5 elements boolean FirstArray[] = new boolean[5]; Scanner input = new Scanner(System.in); int value; for(int i … |
| | Hai, I just want to ask, How to run java program without opening the code? I mean when we click on an icon, the program will automatically run... Thank you. |
| | Hey all.I got a question about the use of action listeners.Actually its more about actionEvents.Anyway,my question is: Supposing i have a frame with four buttons,say "A","B","C","D". I want each time i press a different button something different to appear on TextField.I know i can make 4 different button subclasses,each with … |
| | Hi, I'm new to Java and programming. I have an assignment I'm trying to do and I'm pretty stumped on this question. I have a TreeMap where the keys are Strings (of musical artists) and the values are Lists (of artist name, album title, album genre and album year). I …  |
| | I know this is a pretty newbie question but is it possible for me to start an external application then exit my java application ? But the application I hav started should remain running until it exits on its own. |
| | i want to encrypt the password and store in the database. i extract character find ascii value of that and changed that value and stored in the database.but when i use this it wont have much security. can anyone help me for password encryption.i m using JSP+HTML |
| | How i can call webservice(which is develop in eclips) on JSp page !! please give suggestion |
| | I want to reverse and array of integer recursively, I think this is the way but I get this error when trying with a 5 integer array: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 5 at name.of.package.ArrayAscDesc.CambioAscDesc(ArrayAscDesc.java:12) at name.of.package.ArrayAscDesc.main(ArrayAscDesc.java:34) Here's the code: [code]import java.util.Scanner; public class ArrayAscDesc { public static int[] CambioAscDesc … |
| | I am getting the following error.................. [QUOTE]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: Unable to compile class for JSP: An error occurred at line: 9 in the generated java file Only a …  |
| | Hi, I have to insert data into a database table using jsp and jdbc, query the table data and convert it into an xml file. I am using NetBeans IDE. I'm really stuck and i have a project due. Please do help:'(. Thanks in advance. |
| | hey guys i came across a tutorial online that shows how to make a java media player using JMF..the problem is when i run the program and open the file i get the following error..i googled this and found no help can anyone please tell me whats wrong ? T_T … |
 | Hello, I was wondering if there is some sort of Java code that can get information from a webite ONLY when it needs to. To better explain (by using an example) let's say I have a slow webpage (minimal traffic) where a user clicks a button and Java opens my … |
| | Hey, I made this code with the bits and pieces of knowledge i have, but i don't know how to convert it into a while loop. it is currently in a for loop. the program counts how many certain letters there are in a sentence/ word. String word; String letter; … |
| | How to create a property file in java |
| | In the method below trying to calculate average age in each category('o','u','n'). Ages are stored in a separate class. Code: public double averageAge() // calculating average age in each BMI group { double numbers[]=new double[this.list.length]; double result=0; char[] cat={'O','U','N'}; for (int i=0;i<this.list.length;i++){ int b=this.list[i].age; for(int j=0;j<3;j++){//loop runs three times, as … |
| | HI I have method object appointment ,and inside this object I have another object time and I want to get startHour method(inside the time object) (method startHour(inside TIME(object)inside Appointemt(object)) How can I do that :@ Thanks |
| | Hey guys, Can anyone tell me what I missed in the following code? I've tried everything that came up to my mind, but I can't pass this error. Let me give you some context. My friend and I are making this program that is supposed to send message through command … |
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| | Activity # 1. Create a program that inserts nodes using a binary search tree. Use an array structure to represent nodes of the trees. Activity # 2. Create a program that traverses a binary tree. Use the preorder, inorder, and postorder traversals. |
| | Hi, I have to make a linked-node based priority queue for an assignment. For some reason, however, the enqueue and dequeue just won't work. I have honestly no idea why, because I think the algorithm should work. Can anyone point out the problem? It would be greatly appreciated. [CODE] public … |
| | hi can any one suggests me how to read barcode from pdf file in java is there any library . thanks in advance actully i serached on net for that i found some library such as apose barcode reader but it is not freeware and i also found JBarcode library … |
| | hi i want to read barcode from pdf file. that pdf file has more than one barcode i have to read second barcode then what i do for that |
| | Sir, i am in a trouble and i need some suggestion from you. I have used a sql query and have successfully showed the results in a JTable from the database. Now, what i needed is that after clicking a JButton which in a JPanel i need to show different … |
 | i have tried adding scrollpanes to the Textare but to no avail it cant Appear. i have initialised some text and added it ot the Textarea bt it dosent work. Help me solve it lifesavers! [CODE] import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; import java.lang.Object.*; import javax.swing.border.*; import java.awt.Toolkit; … |
| | which of the following statements is true about casting a) you must cast to convert from an interface type to a class type. b) you must cast to convert from a class type to an interface type. c) you cannot cast to convert an interface type to a class type. … |
| | ok i have this assignment which i'm just having problems with the iterator part of it. from the [B]ListType [/B]class, this is what i wrote: [CODE] public Iterator iterator(){ return new OrderedStringListTypeIterator(list); } [/CODE] this code is from the textbook which idk how they got theirs to work, but... [CODE]import … |
| | how to fix the errors? [CODE]package app.util; import java.io.*; import java.util.ArrayList; import java.util.List; import app.obj.Book; public class BookDatabaseReader { public BookDatabaseReader() { bookDatabase = new File("C:"+File.separator+"User"+File.separator+"Marissa"+File.separator+"Desktop"+File.separator+"eto na"+File.separator+"dat"+File.separator+"bookdb.txt"); } public List<Book> getAllBooks() { List<Book> bookList; bookList = new ArrayList<Book>(); BufferedReader reader = null; reader = new BufferedReader(new FileReader(bookDatabase)); for(String str = … |
| | Hello everyone :) I'm learning Java and I'm creating a pong game. There is something I don't understand how to do though. It's how do I make it so that when a button in one panel is pushed, it calls a method in another panel. Let me quickly explain the … |
| | Hello, for this assignment, we have to imitate SW Airline's boarding process. I think I have everything working so far, except for the fact that my program ignores every Passenger entered into the queue except the first one. It's almost as if it bypasses the if statement asking if the … |
| | What a project i must create if i want do some gui´s windows, and put the code after select item, i do graphical sudoku with difficulty. Can someone write me the way, i would like to start with graphic window and after that code and get the code to the … |
 | Hello guys, I've been surfing the web for hours and trying different published codes to make a [B]stopwatch[/B] work but had no luck so far so I had to come here hoping someone can guide me or refer me to a tutorial on how to make one. [B]The stopwatch is … |
| | Hai!!! I have a class, Search Class...this class suppose to search the data from the MySQL db...on top of the JFrame, should have two JMenu bar button which is call About Us and Help...the problem is, if you run this code, the JMenu Bar doesn't appear on top of the … |
| | I WAS JUST EXPERIMENTING SOMETHING. AFTER COMPILING THIS I GOT THE ERROR: "<identifier>expected x=1;" i have got this error many times, but don't know why this occurs and also i have made the object of the class dabba in the dabba class's main method, is it wise thing to do?????? … |
| | [CODE]import java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingAnimation{ Thread th; ImageIcon images; JFrame frame; JLabel lbl; int i = 0; int j; public static void main(String[] args){ SwingAnimation sa = new SwingAnimation(); } public SwingAnimation(){ frame = new JFrame("Animation Frame"); th = new Thread(); lbl = new JLabel(); Panel … |
| | How can I retrieve an entire database in JSP and compare the first record with the first parameter obtained from a HTML form, the second record with the second parameter obtained from the HTML form and so on..?? Here is my code: MS-ACCESS database:- database name: question table name : … |
| | Hi, This is just a thought. So please don't get mad at me and please don't waste much time over this either. Just wanted to share something that occurred to me. Now I've done a bit of java and a bit of C. Now what I want to do is … |
| | Hi, I just started Java (But I do have 1.5 years in c++) and I found that string switchs aren't allowed, so I tried using a character array, now when I try to define the array, it says that [ICODE]char [10 for example]array;[/ICODE] is not allowed because of [10 for … |
| | Hello, For some reason when I use the particualr block of code below it will work the first time, but when called again with RemComps as true, it will work almost the way I want it to, but instead of the one set of buttons it has 2 (or the … |
| | I tried everything could possibly think of to do this and have spent hours trying to figure it out.. I'm trying to take this timestamp: 2011-03-23 00:43:07 which is in GMT zimezone and convert it to a Date that is in my timezone which is 4 hours later. 1. It … |
| | I've been making a program which reads several strings from a Notepad file which's location is set through user input. Then they enter a string which is in the file, a positive message is shown if it's not then a negative one is shown. However I can only scan the … |
| | Hi. Im making a flash cards program and need help with making graphics, making a menu, making it so that they can go back in and access the decks, and making it so i can give it o other people, and a few other things. Here's my code: [CODE] import … |
| | Hello everyone...! this is my first post here. I have a problem regarding finding the average from an arraylist containing database values. From the database using getString() method i have stored the results of 3 fields in 3 separate arrylist. now what i needed is to find the average from … |
| | Hey people , i need some help in order to complete my game. Explanation: Think we have 4*4 matrices 1 2 3 4 5 6 7 8 9 if we pressed 1 , 2 and 4 , i mean neighbours of the numbers,will be lighted. if the number which we …  |
| | Hi All; need java code to upload and download excel files to the file system.. |
| | We want to write two peograms: I: write a program from the investor takes the values of r, n (where r, n positive values greater than the correct one) And calculates the total shown in relation (1) and shows the value And then calculates the total of the relationship (2) … |
| | Hi guys, I am relatively new to java language of which I'm studying at the moment. I Have spent considerable time looking through examples and java class libraries but have not been successful in finding a solution for: 1) naming an Array within a method 2) adding data to the … |
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