32,199 Topics
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 | 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[] …  |
| | 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 … |
| | 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 '/' |
| | 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 … |
| | 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 … |
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