36,051 Topics
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| | Following me everywhere? why do I get those exceptions very much??? why are they raised?? My classes are always in the same package as the class they accesses them.. I know they are there. Why doesn't the compiler find them???? thanks for your help ppl...please help :@ |
| | Hey all - I have to create a basic client browser that creates a socket with a webpage and then uses a command similar to : GET index.html\r\nHTTP/1.1\r\nHost: [url]www.mysite.com\r\n\r\n[/url] To get the source code for the website. I will store each line recieved from the server into an arrayList, which …  |
| | Hi, I'm having some problems with an infinite loop. For some reason, the process 112 is not being send anywhere. What i'm suppose to to do is to mimic a CPU. Each line represents a process which the first number is the machine time that it suppose to be send … |
| | I'm working on a program in which I am using the BorderLayout Manager. However, I'm having a difficult time changing the size of the window. I want to make it longer and more narrow, with only one or two text fields per row and want to make the text field … |
| | Hello, I need to read in objects from a binary file and place those objects into an ArrayList. Not sure on how to go about adding the objects - this is what I have so far: [CODE]ArrayList<MailingLabel> arrayOfMailingLabels = new ArrayList<MailingLabel>(); try { ObjectInputStream in = new ObjectInputStream(new FileInputStream("labels.dat")); while …  |
| | Just need a few pointers with the code below. I have the below class to complete but I am stuck on the isAllValidDigits() method where i have to create a loop to check and return true if all the int values of the authorId array and the programId array are … |
| | im creating little program which produces cars, tractors and mopeds. car has 4 wheels and 4 cilinder engine, tractor has same, and moped has 2 wheels and 1 cilinder engine. this is what i have at the moment. next thing i need to do that with 2 factories.. home factory … |
| | Hi, I have to do a project on Sudoku. I am finished generating the complete board. Now my major task is to generate a puzzle out of the complete board with the difficulty level. Can some one give me clue to remove the elements randomly from the board. Later on … |
| | Hi, I have a rather large binary file that I am attempting to read in, but I only want to read in the first 100 characters or so. I've tried searching the internet for help or an example, but I've only found examples that read in the entire file...and this … |
| | I am trying to change the look of the jsp/servlet pages dynamically based on the device from which the request comes. i have done the part of how to identify the devices from which the request arises. but stuck at the part where i should change the css sheet. is … |
| | hi iam programming bisection method in java but i dont know how to evaluate functions if someone can tell me a class to do it function y=3sinx +cosX example f(a)f(b)<0 |
| | i am calling a JSP from a servlet but i am getting a error Error 404- Not found. Servlet file is reside in E:\Simple\WEB-INF\classes\servlet folder. ServletHome.java [CODE] package servlet; import javax.servlet.*; import javax.servlet.http.*; import java.io.*; import java.net.*; public class ServletHome extends HttpServlet { public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, … |
| | Im running windows XP Professional I have all of the latest updates on my laptop and I just downloaded the latest version of SQL Developer but when I try to open the program I receive this error “Unable to create an instance of the java virtual machine.” Ive been looking …  |
| | Hey folks :) I was writing some code today, and I wrote a function for computing factorials without use of recursion. What do you think about this one? [CODE]int factorial(N) { int r; r = 0; while (N > 0) { r *= (n-1); n--; } return r; }[/CODE] |
| | Hi All, I am pretty new to Java and i am having difficulty using overloading on the [I]equals[/I] and [I]compareTo[/I] methods. I have a sample application for a school and i need to check for duplicates in records using the equals and compareTo methods. All records have Firstname, Lastname and … |
| | Hi, I am quite new to Comp Sci and I just wrote a program in BlueJ that calculates the value of truth tables and validity in arguments. I followed the book's instructions and have a method with the signature: (It's in the class "Main") public static void main(String[] args) { … |
| | Hi! I try to create HashSet of the next object: [CODE] import java.nio.file.Path; public class WatchedPath { public Path dir; public boolean recursive; public Filter filter; // Ctor with only Path - for comparing between the object (comparing is only by the path!) public WatchedPath(Path dir) { this.dir = dir; … |
| | 1. Create a doubly linked circular list in Java. Each element in the list contains a data which is an object of a Student class and two links, next and previous. 2. The Student class contains two class fields only: • name - The first and last names are in …  |
| | Hey lads, Just have a small query here thats really bugging me. When details are entered by user and checked in database, the program should display one of two messages as seen below. When the details are entered correctly the welcome message displays correctly. However, when incorrect details are entered, … |
| | suppose i created a dequeue class, with methods like insertFront() insertRear() removeFront() removeRear() peekFront() peekRear() isEmpty() isFull() how can i wrap it around and array ?? Will it work the same way as circular does? |
| | Hi, I get this error: `Exception in thread "Thread-4" java.lang.NullPointerException` When I try to send the vector to my form. Does someone knows where I made a mistake? Here is a part of my code: (this part is from my clientapplication (where I make a connection with the server) if … |
| | Hi i'm implementing a small java program where we have the game running in an applet. After each turn I want the applet to reset to the original setting for the next turn. Basically the game is a football being kicked into the goal. After the goal is made/missed the … |
| | I am new one for jsp and web developement... if i click back arrow in navigation toolbar (from any page in my application) ,then go to logout page... For example.... Suppose i am in page4... here i click backarrow in browser then i want to go logout page, don't go … |
| | I am trying to basically use the methods as functions and then call them in main but I cant figure it out. I thought it could be done like this but maybe I am just confusing my php&mysql class with Java. At the bottom of my code, there is a …  |
| | I am new one of jsp .i have developed simple webapplication using jsp... Step 1 : I have one login page : (contains username ,password and sumbit button) Step2 : I have one logout page : it has one link (Go to login page), just u click this link go … |
| | [CODE]// this is overkill Date now = new Date(System.currentTimeMillis()); [/CODE] Why is this overkill? |
| | Hi all, I have a web app and in the web.xml file there is a filter which is applied to all the jsp files. However I need to change the particular filter so that it is not applied to 1 jsp file. I tried searching in regular patterns if there … |
| | Hello, apon summing the rows of a two-dimensional array how can you put the results into a new 2D array so that the results can be sorted from largest to smallest or vice versa? we started with a 7 column 8 row array and now want a two column 8 … |
| | I had done a program with JFrame a year ago and I am trying to convert it to with JApplet so I can put it on the web. So far so good and I am able to see the applet and seems every functions are still working... there is one … |
| | I am having problems setting up drop down menue for a application I am trying to do for a class. Can someone please give me some pointers. Here is the class assignment. Write the program in Java (with a graphical user interface) and have it calculate and display the mortgage … |
| | Hi I'm new to java and working on a program where I want to show the number of rentals for one person in one box and the total rentals in another box. I am having trouble storing the variable or it is not recognizing that I want to keep adding … |
| | I am having error in the following code. What should I do to fix it? Also, how should I call it in main method to test the code? please HELP :( [CODE] package sortingelements; public class Main { public static void main(String[] args) { } public int indexOfMaxInRange (int[] myArray, …  |
| | Hopefully this is fairly basic. I've never used enumerated types in Java. I'm sort of trying to take my C concept of them and make it work in Java. Basically use them as constant integer values. That might be putting the square C block into the round Java hole. I'm … |
| | I seem to have hit a wall with implementing my own version of merge sort. I can sort the list fine in ascending order, but once I try to reverse the ordering (passing in a boolean), I get an ArrayIndexOutOfBounds error. I'm guessing that what I'm experiencing is some sort … |
| | I posted this on Oracle Forums to the sound of crickets chirping. This question entails more Oracle specific tasks then java but since my code is in java, here goes" Hello, I have a java package where I am attempting to implement a database Change notification registration and listener. I … |
| | public class Welcome extends JFrame { private Toolkit toolkit; private static String passy = "123456"; public Welcome() { setSize(300,550); setTitle("Welcome"); setDefaultCloseOperation(EXIT_ON_CLOSE); JPanel panel = new JPanel(); getContentPane().add(panel); panel.setLayout(null); JLabel label = new JLabel("Enter Password"); JPasswordField password = new JPasswordField(6); password.setEchoChar('*'); password.addActionListener(new AL()); label.setBounds(0,0,300,25); password.setBounds(100,0,200,25); JButton b1 = new JButton("1"); b1.setBounds(0,100,100,100); … |
| | Hey guys, I'm stuck at a problem. Check out the code: [CODE]import java.util.*; class testAll { public static void main(String[] args) { Scanner input = new Scanner(System.in); ArrayList pointsArray = new ArrayList(); ArrayList linesArray = new ArrayList(); System.out.println("Enter amount of sides: "); int sides = input.nextInt(); if (sides <= 2 … |
| | On line no 1 there are 1 star On line no 2 there are 3 stars On line no 3 there are 5 stars On line no 4 there are 3 stars On line no 4 there are 3 stars On line no 5 there are 1 stars * *** …  |
| | [CODE]private void eaddbtnActionPerformed(java.awt.event.ActionEvent evt) { if(eaddbtn.getText().equals("Add")){ eaddbtn.setText("Save"); eupbtn.setVisible(false); // edeletebtn.setVisible(false); ecanbtn.setText("Cancel"); } else{ Enrollment e = new Enrollment(eid_txt.getText(),ecode_txt.getText(),egrade_txt.getText() , emarks_txt.getText() ); // ERROR APPEARS IN HERE e.SaveEnrollment(); } } [/CODE] i want to add int value to mysql database...how can i do that? how to convert int value to string … |
| | I need to write a program that displays 50 priome numbers . I need to use a stack to store prime numbers.This is what I hava so far I need some help Please. My while loop is weird |
| | Okay I have managed to finish everything. However, my output for average minutes and average hours is wrong for some reason. I have looked over my code multiple times and I cannot figure out what the problem is. I would appreciate any help. Here is my code. Can you tell … |
| | I have a public class change which holds the private static int [B]commonresource[/B] and the methods : public synchronized void [B]increment[/B](int inc) public synchronized void [B]decrement[/B](int inc) to handle the variable commonresource I have a main class which starts 2 new threads "nikos" , "fosses" with a constructor that takes …  |
| | hi guys , i am trying to use flex in java , can any boday help me guiding it . and how to send data safely to server |
| | I am having problem with the following code `public void grow(int size)`, can't seem to get it working import ou.*; import java.util.*; /** * Class DiscoLight * This class uses the Circle class, and the Shapes window * to simulate a disco light, that grows and shrinks and * changes … |
| | my previous button does go to the previous file: [CODE] import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.io.*; public class StudentAddress extends JPanel { private JButton submit, clear, next, display, previous; private JLabel first, last, street, town,state, zip; private JTextField fName, lName, hStreet,hTown,hState, hZip; private int studentCount=0, displayCount=0, i; //studentCount … |
| | i am trying to make ajax call to a jsp and setting up a few variables using(retrieved from the session) # delimiter using out.println and then use this variable in the response object of onSuccess call back function. and then i have to remove that from the session. But if … |
| | I have a 2D image of a map. What I want to do is 1) Paint this image in a 3D Canvas. And then rotate it with the help of mouse 2) Secondly do some path planning, i.e If I select 2-3 points in space on top of that map … |
 | Hello everyone I'm currently following a course "Game Development" where we learn everything from design to 3d drawing to programming. The language we use is C++, however I'd like to learn Java as well and have there for decided to create a large project (together with a number of other … |
| | Hey guys, how would I happen to utilize a System.out.printf statement to make three columns with the three headings. |
| | I running my little blog on Tomcat 6 server. My hosting company allows me to set up multiple sub domains. I was trying to do for last few hours, but no luck. Having started with [code=xml] <Engine name="Catalina" defaultHost="mydomain.co.uk"> <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/> <Host name="mydomain.co.uk" appBase="/home/user/public_html" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> <Alias>www.mydomain.co.uk</Alias> … |
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