31,001 Topics
 | |
| | I fixed the StackOverFlowError problem from my last thread.. however, my ActionListener is still not working. if any GUI guru here may point out the issue, it would be great. i think this is something very simple and i miss it. [code] //my ActionListener class import java.sql.*; import javax.swing.*; import … |
| | Hello everyone, I am currently developing a chat application and I want to encrypt all send messages. I am using the example below: [code] import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.NoSuchPaddingException; import javax.crypto.IllegalBlockSizeException; import javax.crypto.BadPaddingException; import java.security.Key; import java.security.Security; import java.security.NoSuchAlgorithmException; import java.security.InvalidKeyException; public class DESCryptoTest { public static void main(String[] … |
| | [CODE] import java.util.Scanner; public class testcircle { public static void main(String[] args) { System.out.println("welcome"); double i; Scanner sc = new Scanner(System.in); Scanner scan = new Scanner(System.in); String choice = y; while (i<=10) { while (choice.equalsIgnoreCase("y")); { System.out.println("Enter the Radius"); String radius=sc.next(); System.out.println("Enter the Object name"); String Object = scan.next(); if(Object.equalsIgnoreCase("circle")) … |
| | Hi everyone, I'm trying to create a simple Java game, The Last Space Invader, where you control the last space invader and the tank automatically tracks and shoots at you. The code for my invader is as follows: [CODE]import javax.swing.*; import java.awt.*; import java.io.*; import javax.imageio.*; import java.awt.event.*; public class … |
| | hi, would someone please point out what is wrong with my ActionListener setup? [code] // in my menu class, parse JScrollPane and JTable to the showTable constructor in the ShowTable Class showTableMItem.addActionListener(new ShowTable(scrollPane, table)); [/code] [code] /* * set local JScrollerPane and JTable to be the JScrollPane and JTable from … |
| | Hello guys, I want to know if its possible to use the same socket to transfer two things at the same time. [code] // set up input stream for objects input = new BufferedReader(new InputStreamReader(clientsoc.getInputStream())); // set up output stream for objects output = new PrintWriter(new OutputStreamWriter(clientsoc.getOutputStream())); output.println(nickName + " … |
| | hi. I get a NillpointerException. Here's my code: [CODE] private void Login_ButtonMouseClicked(java.awt.event.MouseEvent evt) { String usrname = uname_TextField.getText(); String pass = passwd_PasswordField.getText(); String pwrd = pass.toString(); String args[] = null; boolean auth_flag = false; try{ R = S.executeQuery("select uname, passwrd from Employee_Master;"); while(R.next()){ if(usrname.equals(R.getString("uname"))){ if(pwrd.equals(R.getString("passwrd"))){ this.dispose(); [B]args[0] = R.getString("uname")[/B]//causing nullpointerexception … |
| | hii i am new learner of java.. I just want to know that it is necessary to declare a default constructor if we are declaring parameterised constructor.. |
| | Hello friends, Got a new question, can someone explain to me how to put an HTML link in my Java program. Example ... "Click here to visit the developer website". So when someone will click on the link, the web page should automatically open in the browser. I searched on … |
| | Hi, I'm pretty new to java and I'm not asking for anyone to do any coding for me. I just need pointing in the right direction. How do I go about printing out the objects of an array sorted alphabetically by name without altering the original array. I know I … |
| | i have to do a java program to perform polynomial operations. i can manage those operations part. but i have a problem when storing the terms of the polynomial in to a linked list. for example when it is given polynomial("4 2 5 3 6 0"); // 4x^2+5x^3+6 may be … |
| | my program won't even run so i must have missed something drastically but i don't see it.... anyway, Create a class called Factor that has a public method called calculateFactor. The method has two two arguments of type integer and checks whether the smaller of the two integers is a …  |
| | [CODE]public abstract class CircleShape { public double radius; public CircleShape(){} public CircleShape(double radius) { this.radius=radius; } public void setradius(double radius){ this.radius=radius; } public String toString() { return "radius"+ radius; } abstract String getDisplayText(); } [/CODE] [CODE]public class circle extends CircleShape{ private double area; public double area() { return radius*radius*3.14; } … |
| | Hi All, I am just learning Java and there is a concept that I cannot grasp. I am writing a simple exercise program that works with stacks. I have a sum method for two different types - Integer and Double. They both have the same logic, so it seems redundant … |
| | Hello, I am attempting to create a program that accomplishes the following: *I am to develop a heap, that is tree-based(not array) *The heap should be ascending *Include the method toss() -This method will randomly toss a node into the heap and will not maintain the proper heap conditions *Include … |
| | hi. I have a jlist on a frame. I want to add items dynamically in the list. So, I am using DefaultListModel..Here's my code: [CODE]public class AdminFrame extends javax.swing.JFrame { private Statement S; private ResultSet R; DefaultListModel model = new DefaultListModel(); JList Employee_list = new JList(model); /** Creates new form …  |
| | I don't know where this question came from, but... Is there a way to start at one directory, say... C:\ . and I wanted to go into that folder, and printout a list of the folders/files in that directory, and then do the same for the rest of the folders … |
| | Hello, this is my first time in participating in this forum and also this is the first time that I've used Java for my entire life. The objective behind my problem was: "Create an Animal Interface that has two methods: eat and move. All these methods do not have any … |
| | Hi. I have two tables in mysql - [B]customer_master[/B] and [B]contact_master[/B]. customer_master has a primary key - "cust_id" ,which is a foreign key in contact_master and "cust_name" which is also a foreign key in contact_master. I have a [B]frame[/B] which will do [B]CRUD operations for contact_master[/B]. The frame has two … |
| | I'm trying to compare two variables that is being inputed by the user but then it wont function [code] if (txt_pay.getItem() < txt_amount.getItem()) { jOptionPane1.showMessageDialog(this, "please enter the right amount"); } [/code] what could be wrong? the error says [quote] operator < cannot be applied to java.lang.string [/quote] another one … |
| | Hi to all, I wrote the java pgm for download the webpage content(html+images) and write on local host.Its wrks fine .But some time it stop while downloading .ie it download only some pages and images.I wrote pgm within try &catch.It doesnt throw any exception like connection time out,connection reset; iam …  |
| | hi, i have just written a simple hello world java program in my linux server, installed jdk ... and tried to compile and run it and it gave me some errors. please details below: [root@localhost javaFiles]# cat HelloWorld.java [code] import java.util.*; import java.io.*; public class HelloWorld { public static void … |
| | Here is my assignment: Write a class named 'Video' that has two attributes, a title (type String) and rating (type int). Then write an application class named 'VideoStore' that first creates an array consisting of 5 video objects, then display the list three times; first unsorted, then sorted by title …  |
| | hi there! I have a file.txt looks like this: [QUOTE]Michael 001 Yeeka 002 Sam 003 Tom 004[/QUOTE] Michael is the member name, while 001 is the ID number. How can I write a coding to validate that whether user has type in the correct name and ID that is inside … |
| | I am trying to implement a breadth first search tree. I need to be able to go up and down the tree, and on each layer there can be varying amounts of nodes on each one. My problem is I've never made a tree before, and i don't know how … |
| | Hello everyone I was failing, how to write an Access Database using Java J2SE 5 edition ? Could you guys help me out? Any help would be appreciated. Thanks  |
 | Hi guys, Am faced with a challenge in the office to develop a software that can take a smaller mpeg4 frames and search for the occurrances of the frames within a larger mpeg4 file. For example a television station pragrammes are recorded for 24 hours and a company that placed … |
| | below is a method describes polynomial multiplication. all the insertTail() and insertFirst() are in the normal format of linked lists. can anyone please show me why it doesnt give me the right multiplication. [CODE] public static void mulpolynomial(String poly1, String poly2) { String[] pp1 = poly1.split(" "); String[] pp2 = … |
| | Hi mates :) how are you? I hope everything is all-right.. ;) I have a small question, it is my HW to be honest here is the question: "Write a method that calculates the following equation: f(x) = 1 if x = 0,1 √ f(x-1) + √ f(x-2) if x … |
| | Hi all I am new to Java and having trouble with constructors with images and audio. I have tried to use the API library to work it out myself but cannot understand what they are talking about. My problem is that I am trying to create two instances of the … |
The End.