36,051 Topics
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| | Hey everyone, I have been assigned to create a recursive maze program and I am having trouble to figure out how to start it. I am pretty much lost and confused and don't know what to do. I do not want anyone to complete it for me but giving me …  |
| | i have to create a DigitsDisplay application that prompts the user for a non negative integer and then displays each digit on a separate line like such "Enter a positive integer: 789 7 8 9 so far i have int num; c.print ("Enter a postive number: "); num = c.readInt …  |
| | hello everyone i'm trying to create algoithm for binary search in multi dimensinal array i have done it on one dimensinal and changed some things but still there is something wrong here's the code i hope you can help public static void binarysearch(int [][] numbers,int searchedvalue) { int lowrow = … |
| | Write java program to do the following: Write a METHOD to input an array of type LONG that stores the value of all the powers of 2 from 0 to 63 (i.e. 2^0 to 2^63 ) Output the contents of the array screen (what happens if you try … |
 | Hi all, Im writing a program, that takes the a, b, and c from an equation, and uses them to find x using the formula: [http://www.purplemath.com/modules/quads/qform01.gif](http://www.purplemath.com/modules/quads/qform01.gif). The problem im getting, is that when I plugin the equation 1x^2 +3x +4 I get x = -Infinity and x = infinity instead …  |
| | hi i create a jsp and a servlet to get data from the data to be displayed in the jsp page. the code is below ListCustomer.jsp <table id="customerListTable" border="3"> <tr > <th bgcolor=>ID</th> <th bgcolor=>Name</th> <th bgcolor=>Address</th> <th bgcolor=>TelNo</th> <th bgcolor=>Req</th> </tr> <c:forEach var="customer" begin="0" items="${requestScope.customerList}"> <tr> <td>${customer.cusid} </td> <td>${customer.cusname} </td> <td>${customer.cusaddress} </td> … |
 | how to do POS tagging in java netbeans7.0.1 applications? |
 | This is my first program apart from the infamous "HelloWorld" one. The purpose of this program is to simulate a lottery number generator. The program is printing numbers which is great, but it isn't behaving like how it should. It's supposed to print 100 number combinations and it only prints … |
 | Hi to Dear Daniweb Members, The application populates data from database into JTable in Netbeans. It has 2 classes. First class retrieves all data from Employee table using Derby. Second class creates the GUI with a JTable component inside it. However i got the following messages. I am so confused. … |
| | Dear Daniweb Members, First of all sorry my english writing. I installed JavaJDK 7u13 with NetBeans 7.2.1 and db-derby-10.5.3.0-bin.zip on a fresh OS. Then i set the environment variables according to their relative paths as seen below. By using ij the test database and the test table created, records inserted … |
 | im having a little troubele with this problem. i am working on an intrest calculator and have hit a snag.its saying there is error with my Math.pow punction can someone help please. ill add what i have so far below import java.util.Scanner; public class Calculator { public static void main … |
| | Dear Daniweb Members, First of all sorry my english writing. I installed JavaJDK 7u13 with NetBeans 7.2.1 and db-derby-10.5.3.0-bin.zip on a fresh OS. Then i set the environment variables according to their relative paths as seen below. By using ij the test database and the test table created, records inserted … |
| | Hello, I'm trying to code a genetic algorithm in java but my code doesn't seem to be working as it should. I think the problem lies within my roulette wheel selection method. Can anyone spot it/point me in the right direction on how to solve it? private static Individual[] rouletteWheelSelection2(Individual[] … |
| | i dont understant why its not going inside "error_01 or error_02" if statment? if user enter username and hit sumbit than it goes in "worked" if statment but if user dont enter any thing in usrname it still go in "worked" if statment. <!-- login form --> <form method ="POST" … |
| | i have project folder name: website_test package name: hello_servet testing_01.java web.xml index.html i need help with servlet name. i think iam names wrong. for ex is servlet-name the class name or project folder name?? web.xml file: <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <servlet> <servlet-name>website_test</servlet-name> <servlet-class>hello_servet.testing_01</servlet-class> … |
| | Hello, I am trying to learn how to use the JGrapht API and a sample program on the web has the following line on how to create a SimpleGraph: SimpleGraph graph = new SimpleGraph<String, DefaultEdge>(DefaultEdge.class); The above line is clear execpt for the "DefaultEdge.class" in the parenthesis. What's the significance … |
| | I have a string as [Ian Wood P. M. Visscher] [Ian Wood L. Mengersen] [Ian Wood] [P. M. Visscher Ian Wood].I want to write this string into two dimensional array. (i.e) String a[0][0]=Ian Wood ,a[0][1]=P. M. Visscher,a[1][0]=Ian Wood, a[1][1]=L. Mengersen and so on.Every time when I would give input, the … |
 | I am working on a project that is suppost to work with 3 xml files. The program is suppost to ask which file you would like to import. It then makes a new folder in the current directory. The program is supposed to create a new file in the created … |
| | Hi all Just looking a creating a possible java or jsp based messenger for a web site. I have tested java based lan messengers, p2p messengers and even openfire+spark+smack instant messaging, XMPP (also called Jabber) which I admit I liked a great deal. They say dont try re-invent the wheel … |
 | Scanner input = new Scanner(System.in); System.out.println("Enter a value : "); String s3 = input.next(); System.out.println("Enter another value: " ); String s5 = input.next(); String s = ("1= add, 2 = subtract"); int op = Integer.parseInt(s); double result=0; switch (op) { case 1: result = addValues(s3, s5); break; case 2: result … |
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| | hi folks, im having a problem here on my code can't figure what's wrong.. so here's my code: import java.awt.*; import java.awt.Font.*; import java.awt.Color.*; import java.awt.Button.*; import java.awt.event.*; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.*; import javax.swing.JOptionPane; public class Calc extends JFrame implements ActionListener { JTextArea txtArea; static final … |
| | plz tel me how to write a jsp pgm to take values from mysql?plz help me  |
| | I was proposed a project that sounds like this. Consider a set of logical gates like AND, OR, XOR or NOT. Allow for building any logical circuit by connecting such gates. Provide input (0/1) to a number of gates and collect the results at the output of some of the … |
 | System.out.printf("\nRegular pay:$ %.2f",regularPay) System.out.printf("\nOvertime pay:$ %.2f",overtimePay) System.out.printf("\nTotal Pay:$ %.2f",overtimePay+regularPay); to print like /Regular Pay: $ Overtime Pay: $ ///Total Pay: $ ignore the '/' |
| | I have created my project using jsp,servlets.I have also used meta tag for deleting browser's cache. Once logout,the user should not be able to perform any function using back button.I dont want to disable back button.The user should be on logout page even if he presses back button. |
| | Sorry for the long code. Here it loops through a text file with up to 5 lines and reads a random line. If the line it reads is null then it generates a random response. However when compiled with a test file of 2 lines it only has an output … |
 | Write a Java program to do the following: A dairy farm sells organic brown eggs to local customers. They charge $3.25 for a dozen eggs, or 45 cents for individual eggs that are not part of a dozen. Write, compile, and test a Java class that prompts a user for …  |
 | This prompt scanner works outside of this program but when i integrate it, it doesn't work: All code work. just no together. Help would be much appreciated. Scanner in = null; Scanner key= new Scanner(System.in); System.out.print("Input file name: "); try { String filename = key.nextLine(); in = new Scanner(new File(filename)); … |
 | Uhh, hello. I just want to get a sample line of codes that displays the given string, insert a new element and deletes an old element. So far, this what I have done: import java.io.*; public class EmpLists { String employees[] = {"A", "B", "C", "D", "E" }; } class … |
 | import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class Calculator extends JFrame{ // Declare GUI components private JTextField jtfFirst; private JTextField jtfSecond; private JTextField jtfResult; private JLabel jlblFirst; private JLabel jlblSecond; private JLabel jlblResult; private JPanel entryPanel; private JPanel buttonPanel; private JButton jbtAdd; … |
| | I have done the following codes to create a bar chart with the data from DB, and save it as an JPEG file. I wanted to add percentage value anywhere in the table, JDBCCategoryDataset dataset = new JDBCCategoryDataset("", "oracle.jdbc.OracleDriver", "", ""); String query = "SELECT std,id from table"; dataset.executeQuery(query); JFreeChart …  |
| | Hello, When I run the project using my localhost, everything works fie. But when I use an other server I get this error: No suitable driver found for jbdc:mysql:// public void populateList2() { Connection con = null; Properties conProps = new Properties(); conProps.setProperty("user", "abn859"); conProps.setProperty("password", "100011399"); try { con = … |
| | pls help to under stand the java program |
| | well, this question maybe so silly, but i need to know.. i have to make an application with client-server system with java (client application for on android and server application for on PC) and i asked to make the class diagram for both in one class diagram (not seperately). so … |
| | Hi, Can anyone please help me out .I am trying out to send a mail using JAVAMAIL API, While executing the jsp code on server it is throwing few exception error. <%@ page import="java.io.*,java.util.*,javax.mail.*"%> <%@ page import="javax.mail.internet.*,javax.activation.*"%> <%@ page import="javax.servlet.http.*,javax.servlet.*" %> <% String result; // Recipient's email ID needs to … |
| | hai every one.. am uploading image file before uploading i want know the height and width of image and also size of file please help in java script. thank you |
| | I have made following code.The first statement gives me output 21. That is i know that default capacity is 16 + 5 for Hello But i don't get, why it gives 44 as output as i am increasing capacity from 21 to 30 by using ensurecapacity() method. StringBuffer sb = … |
| | So im working on a public and private case and i posted ealier with issues, but i thought i had most of them fixed and turns out fixing those just opened up more problems... any help is appreciated thank you! ( I am very new to using java...) /** * … |
| | One large chemical company sells its chemical equipment at the following rates: Equipment Code Description Price RQ1 Reactor 0.5KL GMP $1500 RQ2 Reactor 20 KL Non GMP $3000 The company pays its salespeople on a commission basis. The salespersons receive the basic pay of $ 2000 per month plus a … |
| | My problem is with a **Polymorphic** method , getSalary (which should be of type double. The problem is that the salary in this case depends on the average mark of a student and thus I felt the need for an **If Statement** because of the 2 conditions. However java does …  |
| | Hi, Which os is best for java and oracle programming.. suggest me. |
| | I have been working on this code for days now and I am down to one error:error: class, interface, or enum expected showing at line 56, I have no idea why it won't work... any suggestions? thanks! import java.util.*; public class Pet { // This gives the user a field … |
| | Ok so I do not know where this post belongs, but apparently, Java is the language that is used for Arduino boards...I thought that it would be C. I have no idea where to begin, but I am really interested in tinkering with Arduino boards. Like REALLY. So I need … |
| | Hey guys I'm having problems figuring out how to write my driver class for my Array class. My questions 1.How do I make the array in my Array class reference the array in my Driver class? 2.How do I pass my class methods from my Array class to my Driver … |
| | Hey guys looking for some help with my ArrayTester class... The array is supposed to 1.create a 20 element int array and populates it with random elements in the range 20 through 65 (both inclusive). -I Believe I have already done this. 2.Use the java.util.Random class with a seed of … |
 | Hi! So i'm trying to code a program that works like an ATM machine. You 'insert a card' and then enter your pin. once the program has verified your pin, you may continue on to the next steps which include making a deposit, withdraw, printing a monthly statement and checking … |
| | I'm writing a class to represent a flight. The only error I'm getting is on line 97. Flight.java:97: error: missing return statement /** Class Flight represents a plane at an airline Author: Anna Mae Decker E-mail address: adecker0033@kctcs.edu Last changed: 02/10/13 Assignment1 */ public class Flight { /* * declare … |
| | I have done RND on Spring Application development on Apache Server at home which works fine. Now we are about to start the development of web application using Spring in my company. Is Spring deployment is feasable with **sun java system web server** And which tool to prefer for development … |
| | Im trying to call the method "public void insertCard(int p)" within the same class into the method " public void deposit (double amount) " My code for both methods is displayed below. the objective would be to have the deposit method return the last print statement if the card is … |
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