import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;
public class FileHandlingDemo {
[code].....
As you can see my Intention is to save randoly generate Integer in the output file And this is not working but if I use Something like this
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class FileHandlingDemo {
[code].....
it's working fine reading that from Input.txt and writing that data in output.txt file. but not in first case Both file are in working directory already created.Where is wrong?
My instructor gave me this code to use as my Array sort. I can not get this to work. I do not get any compile errors, the code just does not do anything.
Java Code:
package inventoryprogram4; import java.util.Scanner; public class Inventoryprogram4 { static GUI mainGUI = new GUI(); static String outText = "";
I am working on a contact list program with a GUI for a school project.I'm running into all kinds of issues when trying to update the JList in my GUI which displays the contacts.I think my issues are being caused by a lack of synchronization between the contact list that stores the data, and the contact list that is being displayed.I've tried all kinds of getters and setters, passing array indexes, passing array member objects etc.
General rundown of how I want the GUI/Code to work: When I select an object in the JLIst, the fields on the right should display that objects information.When the "Add Contact" button is created, a new blank contact should be created and added to the Contact List, and then displayed in the JList.When a field on the right side of the GUI is updated, the object in the contact list is updated simultaneously (using document listener), and therefore the JList would also be updated.
Here is the program I wrote for calculating the circumference of a circle.
//circumference.java //program that calculates the area and circumference of a circle import java.util.Scanner; //program uses class scanner public class circumference{ //main method begins execution of Java application public static void main(String args[]){
[Code] .....
Even though my code compiles and runs without any errors, the program doesn't calculate the circumference.
Alright so I'm trying to write a code that implements a for loop and if statements that displays any number from 100-200 if the number is divisible by either 5 or 6 in rows of ten numbers each row. If it is not divisible by that number then it should go back to the beginning of the loop until it reaches 200. My main problem is that it doesn't display anything. I don't get any errors or anything but every time I run the program it just displays nothing. Sample output is at the bottom of the code.
public class Exercise5_11 { public static void main(String[] args) { int count = 0; int i = 100; //for (the numbers from 100 to 200) for (i = 100; i>100 && i<200; i++){
I am currently writing two java classes (client and server). The client takes an input number form keyboard and sends it to the server. The server then multiplies this number by two and sends it back to the client. The numbers should also be printed to screen along the way, for example if I input the number 3 I should get
"From Client: 3" "From Server: 6"
They should continuously do this unless a negative number is received by the client, say for example the number -3 is sent to the server and it returns -6.
The code I have for the two classes so far is:
import java.io.*; import java.net.*; import java.nio.ByteBuffer; import java.util.Scanner; class Client { public static void main(String args[]) throws Exception { DatagramSocket clientSocket = new DatagramSocket();
[Code] .....
Currently, when I run the program all I get is an output of the number first entered. I am aware it requires a loop but I don't know where and what the condition should be.
Also if I wanted to adapt this so that it would take the integer from client and subtract two at the server and return to client who sends back to server to keep subtracting two unless it reaches a negative number at which point the client will terminate the program - how might I do this.
I do realise there needs to be a while loop in the above code, but I wanted to test it sent the number from client to server and its not doing it. All I get is a print screen of 'enter number' and then the number I enter.
Working on a program that creates an array from a file, organizes it in various ways, and then prints the results. Right now I'm specifically having trouble with the printAry() method - when I try to run it, I receive a NullPointerException for the active line in printAry() (EDIT: line 102). Not sure which sections are important to this, so I will include the client class and most of the service. I realize that the amount of documentation I included is not necessary, but it is required for the class.
class Lab3StudentAryService { private int count; private Lab3StudentData [] studentAry = new Lab3StudentData[50];
/* @param: none @return: none reads file and converts to array. */ public void fillAry() //constructor { Scanner scan = new Scanner(System.in);
My Computer Programming teacher has given the class a problem that requires the use of var.charAt(), var.length() and while/for. Basically, the problem is that we have to create program that'll show a mirrored or reverse version of the entered word. Like for example, if your input is the word "Hello" (the quotation marks aren't included), the output will be "olleH".
Here's the code:
import java.io.*; public class StringMirror {public static void main (String [] args) throws IOException {BufferedReader scan = new BufferedReader (new InputStreamReader(System.in)); String enteredWord = ""; int lengthOfTheWord = 0; int lengthOfTheWordMinusOneVersion = 0;
[code]....
It is working, but the problem is that after the output, there's this error that says String index out of range: -1.
the program is working but I kind of wanted it to have no errors in the end.
I have a java program which would display a message dialog box. The problem is it would stopped working before even displaying the message dialog box. This is my code.
import javax.swing.JOptionPane; public class HelloDialog { public static void main(String [] args) { JOptionPane.showMessageDialog(null, "Hello World!"); } }
There is a pop-up window which would say "Java(TM) Platform SE binary has stopped working." I am using textpad. What should I do with this?
I'm attempting to make a simple Pythagorean Theorem program (A squared + B squared = C squared) but am running into problems when I write it as object oriented. The darn thing works when written as a simple process, but that isn't Java now is it? Here's the simple:
public class PythagoreanTheorem extends ConsoleProgram { public void run() { println ("Finding C from A and B."); double a1 = readDouble("Input A: "); double b1 = readDouble("Input B: "); double aSq = (a1*a1); double bSq = (b1*b1); double cSq = (aSq + bSq); double c = Math.sqrt(cSq); println ("C = " + c);
I am developing an application to share my client screen with server, it is working well on swing. But i want to develop as web application, i am trying to using applet. But i am facing the fallowing problem..,
1) The Applet screen also open and project also running well on server mechine. But unable to see the client screen on the server.
2) The problem may be to display the JDesktopPane or JInternalFrame.
My working Server Code extends withe JFrame..Java Code:
Why in my program keys are not working, what I forgot to write?
import javax.swing.JFrame; public class Main { public static void main(String args[]) { JFrame frame = new JFrame("Stickman"); frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE); frame.setSize(450, 490);
I am working on a fairly simple program where I have a colour change three times using the red green blue spectrum. The problem is that I keep getting a result of zero no matter what I do.
import java.awt.*; class RectangleMain { public static void main (String[] args) { ColouredRectangle blocky = new ColouredRectangle(50, 100, 20, 40, Color.red); System.out.println(blocky.getColour()); blocky.mixColour(Color.blue);
I'm programming a game, but the keyListener doesn't work. Here is the source code:
import java.awt.event.KeyEvent; import java.awt.event.KeyListener; public class InputHandler implements KeyListener{ public InputHandler(Game game) { game.addKeyListener(this);
[code]....
My Question is: Why will it not say "up", if I press "w"?
I'm having a problem where an if statement isn't working. In the Person class boolean olderThan ignores my if statement so it always returns false and I just don't get why that's happening.
import java.util.Calendar; public class Person { private String name; private MyDate birthday; public Person(String name, int pp, int kk, int vv) { this.name = name;
I have added a Simple Jar file in Eclipse Proect->BuildPath->jar file but class Inside that are not showing in My project this is my Project Structure and I have all ready checked in Order and Export..But jar file is not working.
I am learning out design patterns and doing a little fun project on Model Control View (MCV). I got the concept down, it is pretty simple for the most part. However my buttons are not working.
Here is the code:
public class Controller { private Model model; private View view; Controller(Model model, View view) { this.model = model; this.view = view;
[code]....
It runs but nothing. My other questions is how can I make a box that will print the results.
I need to find out if one array list is a sub-sequence of another. The elements in the first list all need to be in the second list and must be in the same order. So s1<n, t, a> is a sub-sequence of s2<q, n, f, r, t, d, a>, but s1<a, a, t> is not a sub-sequence of s2<a, t, a>. I need to use iterators to go through each list, and I should only go through each list once (since it has to be in the same order) so nested loops don't seem like they would work because it would start at the beginning of one list every time it moved to another element in the outer loop's list.I seem to have an issue where the itr1. next() is ignored when in an if statement.
My current code just stalls and will never stop running. I've also switched things around and put the not equal check after the if it is equal and it throws a NoSuchElementException.
import dataStructures.*; public class Subsequence3 { public static void main(String[] args) { ArrayList<Character> s1 = new ArrayList<Character>(); s1.add('n'); s1.add('p'); s1.add('a');
the problem which im facing when executing jar file is it is not working same as when i run file using the IDE.When run jar file, it won't open the new frame even the user and pass combination correct.But when i'm compiling using the IDE, it works as charm. The main menu popped up after i logged in.I've tried Clean and Build and it's not working too.
I code a program using Eclipse Keppler with Java 8.0. I made a program with 2 JPanel. The first JPanel is working well. From a button in first JPanel, I excute second JPanel, but It is not working. No error when I compile the code. Here is, I attached the source code.
working on a project but cant seem to get my while loop to restart i want to restart this guessing game if the user inputs y at the end otherwise it will end.
import java.util.Scanner; import java.util.Random; public class GuessingGame{ public static void main(String[] args){ Scanner in = new Scanner(System.in); String again = "y"; while(again=="y"){
i am trying to make taxi meter which shows the current price.Rightnow I have to click startmeter afterevery 1 minute than it's update the new price but I want it to update automatically once the price change after 1 minute instead of me pressing startmeter everytime.This is my 1st time I am using timer class. I am not sure why timer is not working.
i have a problem with the jsf 2.0 version with inplace select,in jsf 1.2 it was working, but in jsf 2.0 it is not
problem: when select one of the item in inplace select dropdown,I am trying to update it with the selected value using the a4j:ajax tag, using but the control is not calling the update() method
<rich:column id = "locationClmn"> <f:facet name = "header"> <h:outputText id = "LocationHeder" styleClass = "headerText" value = "#{messagesRefdata['notifications.locations']}"/> </f:facet> <c:set var = "locations" value = "#{notificationConfigurationBean.listOfLocations(ntc.notification)}"/> <rich:inplaceSelect value = "#{ntc.location}" showControls = "true"
[code]....
I have even tried f:ajax, execute= "@this", immediate = true.
there is no divider in the operation. Iadded a print i to confirm the loop works. I tried with and without the brackets..Can you use the i in the operations of the loop? I figured I could since printing it out give me a list of numbers
public class harmonique { public static void afficherHarmonique( int wholeNumber ) { int harmonique = 1; for( int i = 2; i <= wholeNumber + 1; i = i + 1 ) { System.out.println ("i =" + i); harmonique = harmonique + (1/i); System.out.println ("harmonique =" + harmonique);
