32,204 Topics
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 | I am confused about static class and nested class. Is there any difference to code and use of static & nested class?.  |
 | What is the difference between an instance variable and field in java? |
| | i am trying to get an input from my mic, and amplify the sound, i started searching for sample source codes, and java sound amplifying tutorials, but i found none of them relevant. so how can i amplify the sound that i received as input from a mic. can some … |
| | Im developing a J2EE project and also Using JBOSS 4.0.2 server,when i run the Servlet program im getting the error "The Selection Is Not Within A Valid Module". Please Reply...Thanks In Advance.... |
| | if i click button in pqge 1 page 2 should refresh if i click page 2 button page 3 shoould refresh if i click page 3 button page 1 shoud refresh ... can any one tell me the javascript code for this plz |
| | Hey, I am trying to find a way to limit how many characters a user can enter into a JTextField. Does anyone know how to do this? Thanks! |
| | Hello, I am having problems with indexOf() and contains() they work if I put letters in the code to test, but I want it to test what the user enters. And that is not working. The user enters a letter into a JTextField, and I am storing that word to … |
| | Hello guys, I'm trying to create a method where it takes a InputStream as a parameter, reads the stream and returns the number of characters it contains as an int. I'm having difficulties with this. I've searched the internet for examples, but i can't find one that helps me with … |
| | Hi There, We have one java class which is to do the document generating, and from the log files we found that this servlet doing the replacing the data "PK" to "Key", wondering why it doing this. 2009-05-22 12:07:24,921 [ (self-tuning)'] DEBUG rk.servlet.PDFGeneratorServlet - Replacing the PK's with Key values … |
| | Hi, I'm trying to figure out how can I make split read from the file and recognize how to put the strings into an array from a file, based on a new line break. Example of my txt file: [ICODE]This will be my first huge paragraph, it will contain many …  |
| | I want to read a jpg image from a file to an Image object and then paint it on my JPanel, but the image doesn't appear.I've tried drawing some other stuff on the panel (like lines etc.) and everything appeared without any problems. My code: This class represents my JPanel: … |
| | I am creating a mobile game using Netbeans IDE 6.0.1 but I have a problem adding new configuration I get the following error: java.lang.NullPointerException at org.netbeans.modules.mobility.project.ui.customizer.NewConfigurationPanel.isValid(NewConfigurationPanel.java:198) at java.awt.Component.invalidateIfValid(Component.java:2740) at java.awt.Component.setLocale(Component.java:1810) at javax.swing.JComponent.<init>(JComponent.java:595) at javax.swing.JPanel.<init>(JPanel.java:65) at javax.swing.JPanel.<init>(JPanel.java:92) at javax.swing.JPanel.<init>(JPanel.java:100) at org.netbeans.modules.mobility.project.ui.customizer.NewConfigurationPanel.<init>(NewConfigurationPanel.java:96) at org.netbeans.modules.mobility.project.ui.customizer.J2MECustomizer.run(J2MECustomizer.java:304) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561) [catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986) anyone know what …  |
| | [code] import java.io.*; import java.util.*; public class lab11_2{ Scanner in=new Scanner(System.in); private int month=12; private int sum; private int value; private int rainfall; private double total=0; private double average; private double standard_deviation; private double largest; private double smallest; private double months[]; public lab11_2(){ months=new double[12]; } public void setMonths(){ for(int … |
| | hi, i want to draw rectangle based on mousedrag event. if user dragging the mouse, then the rectangle on the applet should increase or decrease basing on current mouse coordinates. i have the following code. in the following code i am using [b]SelectionArea[/b] class which extends a canvas on which … |
| | How do i compare an object with null? From what i've seen right now, at execution an NullPointerException will be thrown :S For example, if I have a list: [code=java] class List { private Node data; private Lista urm; public List(Node d,Lista u) { data = d; urm = u; …  |
| | Below I described a complex polynomial which is a part of my newton method. When I define the complex number [x = new ComplexNumber (0,0)] it only returns 0 or 1. Also I have overriden the basic string format to make it look like a complex number, but it doesn't … |
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| | I am new to programming and am trying to create a program to access a database of DVD's. I want to input a unique code for a title and display relevant fields from that record. I am getting the error above and have spent many hours now trying to see … |
| | Hello everyone, I am trying to update a JTable after a user clicks a button. I have a bunch of data in a TreeMap, which I then convert to a String[][], and pass to a DefaultTableModel, and then use that DefaultTableModel in the JTable. When the user clicks a button, … |
 | Hi. My problem i guess it is simple but i guess I'm simple as well :). The problem is the flowing: I have a JTextFead and a search method for IDs. The IDs are 7 char long. I want to be able when the user enters 7 chars the search … |
| | Just had a quick question about my code. Seems like a very simple solution, perhaps I'm just too sleepy to think straight. What I am wanting to do is if a certain index is selected in my combobox i want certain textfields to display which is apparent by the code: … |
| | Hi me and my class are getting this problem with tim.start(); and stop. we get start to work with a button but cant stop and we can stop with the keyboard but not with the buttons bad explaination i know but have an look plz :P [CODE] /* * To … |
| | Hello, For some reason, my program prints out extra zero from my linked list Can anyone tell me why? Thank you [ICODE]public class Main { public static void main(String[] args) { IntNode my = new IntNode(5,null); LinkedList list = new LinkedList(); list.createList(0); list.addValue(1); list.addValue(23); list.addValue(3); list.addValue(4); list.print(); list.getLength(); } }[/ICODE] … |
| | Hello, I was wondering why do we need to assign value of -1 to the top of the stack? topOfStack = -1; Thank you |
| | Ok, i got this so far ... [code] import java.util.regex.Matcher; import java.util.regex.Pattern; public class Testing2 { public static void main(String[] args) { Pattern p = Pattern.compile("[wati]"); String text = "water"; Matcher m = p.matcher(text); if (m.find()) { System.out.print("Found !"); } } } [/code] With that code i got a match, … |
| | Hey all, Im working with assembly atm and thought i might just get a better idea understanding loops if i know how java loops work not that it is really the same im just trying to back track. Im trying todo the following: When var1 = 3 It then needs …  |
| | Hi i have created a list which reads from a text file. how can i view the contennts of the list outside of the method it was created. I have inserted my code below. [ICODE]//read Customers.txt and save in an object. List<Customer2> list = new ArrayList<Customer2>(); File file = new … |
| | Hi ... i found a way to add watermark in java to the following images format: PNG , JPG , GIF... (like this: [url]http://blog.codebeach.com/2008/02/watermarking-images-in-java-servlet.html[/url]) Now im looking for a way to do the same with BMP and TIF... (cause this way doesn't work on that format...) Anyone know how to … |
| | Im trying to program a Caeser cipher that will upload a file from documents and enrypt/decrypt it. i do not know how to implement one main class containing all that and different methods in one class. i have different separate classes. can anyone pls put them together as one main … |
| | I have design report with ireport, if that report i run in netbeans its ok, but while i move to drive c: got error like this "error displaying report page. see the console for details" if i try in command prompt get message [code] java.lang.NullPointerException at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown … |
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