32,199 Topics
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 | I am trying to do an assignment that requires us to do something with pentagonal numbers. This is my code: import java.util.Scanner; public class Pentagonal { public static void main(String[] args) { System.out.print("The Pentagonal Numbers: "); getPentagonalNumber(10); } public static int getPentagonalNumber(int n) { Scanner input = new Scanner(System.in); System.out.print( … |
| | I am trying to reverse the number that is doubled from the user input. Problem is that if they enter a number like 20000 it gets doubled into 40000 but it reverses it to 2 rather than 4. How do i get it to make the doubled number reversed and … |
| | Okay, so for another assignment I have to find the distance of two points. I understand how that works but for some odd reason, when the program the professor set up tests it, the numbers are way off. This is what i have done: public class Distance { public static … |
 | I made this minesweeper game earlier this summer. It shows many things, including: array use, 1D array to 2D array, gridlayout, changing the way a JButton works depending on mouse button used, floodfill, loops, GUI. slightly long, 382 lines, can probably be condensed. There is one known bug that i … |
| | This is how you calculate the area of a triangle, hope you guys find this useful. import java.text.DecimalFormat; import java.util.Scanner; public class Exercise2_15 { // find the area of a triangle public static void main (String [] args) { double side1 = 0; double side2 = 0; double side3 = …  |
| | I have a problem with my newly application where i want to execute a c/java program file. And after executing the file i want to work with the output of that file. Please anybody give me the solution for that how can i do this? |
| | Hi guys, i am trying to find the area of a triangle and for some odd reason i can't get it to produce the right numbers. Here is my code: import java.util.Scanner; public class Exercise2_15 { // find the area of a triangle public static void main (String [] args) … |
| | [CODE] try { Class.forName("oracle.jdbc.driver.OracleDriver"); Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl", "scott", "tiger"); if (con == null) System.out.println("Connection not successful"); else System.out.print("successful...."); con.close(); } catch (Exception e) { e.printStackTrace(); } [/CODE] Error: [CODE] java.sql.SQLException: The Network Adapter could not establish the connection at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:412) at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:531) at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:221) at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:503) at …  |
| | Hi, I need to create a Add-on for firefox I have tried the following methods and it is working fine 1. Using XUL runner 2. Drag and Dropping the .XPI file in the Mozilla Firefox.(using XUL, HTML,CSS and Javascript). Can anyone tell me How to create an Add-on for Firefox …  |
| | Hello I'm new to programming and I'm trying to make a java application that will "hear" (not record necessarily) the sound and display how loud is.I'm thinking of converting the sound recordings to numbers,so I can see the difference on the sound levels.I got this code and I added the … |
| | I have following questions, can someone tell me if i answered correctly Can we configure portlet wiring for two portlets mapped on two different pages? no Custom Validators in JSF will be executed during the Render phase, is it correct? yes SOAPUI is specialized in optimizing the web services message … |
| | How do you add a membership records in java(bluej) First Name, Last Name, phone number. Please can you help me  |
| | Hi, I was asked to make a Phone Book thats saves entries and call them up. Then the teacher added a new task. The Program should delete entries. He gave us a methode and said we are not allowed to use ArrayList or Hashmaps, ONLY Arrays. I tried alot but … |
| | Hello guys i want to know if its possible to format a text as it is done ms-word on a jframe? i want to be able to edit the text i put on my jframe by specifying the heading, making some texts bold, adding font color to som texts and … |
| | Okay, last question of the night. My program is to have a program collect a number, double it, and reverse. I am having problems with reversing it... Here is my code: import java.util.Scanner; import java.text.DecimalFormat; public class ReverseNumber { public static void main(String[] args) { Scanner s = new Scanner(System.in); …  |
 | hi guys, I wonder if anybody can clarify something for me. Take these 2 fragments of code (2 constructors belonging to 2 different applications): First one: public MouseTrackerFrame() { super( "Demonstrating Mouse Events" ); mousePanel = new JPanel(); // create panel mousePanel.setBackground( Color.WHITE ); // set background color add( mousePanel, … |
| | Testing the following code from a book public class RunTime { public static void main(String[] args) { Runtime r = Runtime.getRuntime(); //MEMORY MANAGEMENT long mem1, mem2; Integer intmatrix[] = new Integer[1000]; System.out.println("Total memory is :" + r.totalMemory()); mem1 = r.freeMemory(); System.out.println("Initial free memory is :" + mem1); r.gc(); mem1 = … |
| | Okay, so this is a similar error to the code before. So I created this: import java.util.Scanner; public class IntegerCount { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter an integer, the input ends if it is 0: "); int num = input.nextInt(); if (num == … |
| | On my code, it says that there are 2 mistakes and I can't fix them. Here is my code: import java.util.Scanner; public class Exercise4_1M { public static void main(String[] args) { int countPositive = 0; int countNegative = 0; int count = 0; int total = 0; Scanner input = … |
 | // Create the cboSelectGroup, and add it to the navigation panel: //String[] strDefaults = {"Defaults"}; //cboSelectGroup = new JComboBox(strDefaults);Public Class Form1 cboSelectGroup.setPreferredSize(new Dimension(150, 40)); cboSelectGroup.setMinimumSize(new Dimension(150, 40)); cboSelectGroup.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { btnImagesActionPerformed(evt); } }); |
| | Hi guys, I am working on an assignment for a class of mine (Java) and I am really frustrated with it. This was my very last attempt (out of like 20)... System.out.print( "Enter temperature in Celsius to convert to Fahrenheit: " ); double c = kbinput.nextInt(); double f = ( … |
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 | I'm currently working on a homework assignment in one of my classes, and I'm having some trouble with it. I am supposed to make a multithreaded messaging program that allows users to connect using both TCP and UDP. The messaging program works perfectly when TCP is selected. However, I do …  |
| | hi, everyone I am a Java newbie. I have followed a bunch of tutorials and examples from the web but they all failed miserably at teaching me how to properly apply this library: com.google.gson. First how do I receive properly in the java servlet a json request that has been …  |
| | Hello Everyone, I am having trouble getting a display of my program on the JTextArea "DisplayWindow". My code works and compiles but i do not know how to transfer the program to run on the GUI. It is really simple and I just want it to display and accept the … |
| | I'm new and trying to draw a table type where I can place scores inside like 5; A B C 1 5//this is where it all falls apart 2 3 I have this so far but not working; public class Table3 { static int[][] list = new int[4][4]; //private char … |
 | Dear all, I have a program to code which would take several lines of input from user (a fruit name, it's price per kg and the number of kgs sold). Each seperated by a space. It would then output the total money made and the name of the fruit that … |
 | I've got a JTable called chances_T full of doubles ranging from 0 to 100. I'm trying to set the background color of each cell based on the cell's value. So I built a custom cell renderer: class CustomRenderer extends DefaultTableCellRenderer { @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, … |
| | I am trying to cut the decimal off the output of this small code: import java.util.Scanner; public class Distance { public static void main(String[] args) { java.util.Scanner in = new java.util.Scanner( System.in ); double x1 = in.nextDouble(); double y1 = in.nextDouble(); double x2 = in.nextDouble(); double y2 = in.nextDouble(); double … |
| | I am trying to set the boolean newEnergy to true only when the item is found. However, it is true at the beginning of the game and remains true until the command 'use' is used. Is there anyway to set newEnergy = true only when the item is found or … |
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