DAO Based Application - Replacing Old Textfile
Apr 16, 2014
I'm currently trying to build a DAO based application where you use a text file as a data source. It have worked out well until I tried to delete lines from the file.
public void delete(DTOBil dtobil) {
try{
reader = Files.newBufferedReader(Paths.get("databilar.txt"),charset);
writer = Files.newBufferedWriter(Paths.get("temp.txt"), charset, StandardOpenOption.CREATE_NEW);
String line = null;
while((line = reader.readLine()) != null){
[Code] ....
I've managed to fill out the temp file with everything except the line I wanted to remove, but when I try to replace the original file with the temp file it won't work. It casts the error: "temp.txt -> databilar.txt".
I've also tried to use the renameTo method without any success...
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Feb 13, 2014
I am new to JSP !! and I'm developing a web-based chatting system using JSP and socket.
The problem I am facing is that the sender can send message but on the receiver side we have to manually refresh the page. The sender stays into blocking mode until the receiver refresh its page !
After that I've implemented auto-refresh on the receiver side and "Connection Refused" exception is generated.
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Jun 19, 2014
a new java executable file which does heavy processing (batch). Development hasn't really started yet and the design phase is just beginning. Now the client is asking us to give them the minimum server specs to be able to run our application..I'm thinking this can't be done without performance testing, which will be after development. Is there a better and faster way to be able to assess this?
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Sep 16, 2014
Any example of client/server socket based application using Spring and Maven where application do the following
Client sends a request with a path to any file on the server
„h Server reads the file and responds back with the content
„h Client outputs the content to the console
I am trying to follow this [URL] ....
I am using java 6
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Apr 15, 2011
At our company we run a third-party Java-based GUI application on one of our Linux server machine, displaying the application to our local Windows work stations using the Cygwin X Server.We noticed a few problems with a new version of this application and was able to narrow it down to the following conditions:
1. Java Swing application running on a UNIX host;
2. Java used is 1.6 (problem not noticed when using Java 1.5)
3. Displaying to Cygwin X server (I've heard other windows-based X servers have the same issue, but I don't have access to any others at this time).
If we run the application natively on Windows, I'm told if the application runs on the Linux host and displays natively to that machine's display there are no problems (although I'm not able to verify this myself).The problems are:
1. Any new frame/dialog is opened in the geographic center of the dual displays, rather than in the middle of one or the other;
2. Any attempt to drag the window to a different location on the display seems to work, but as soon as you let go of the drag, the window snaps back to the original location. This only happens the first time you try to move each window.
3. Drop-down controls (JComboBox, for example) just close back up as soon as you click on them. If you click and drag the mouse to attempt to make a selection, no selection can be made.
Are these known problems using 1.6 on UNIX displaying to Windows-based X Servers?
The only real problem is number 3. I expect that if I put more work into the window placement, I should be able to get past number 1. Number 2 is just a minor annoyance.The following is a simple Java Swing application which when run in the correct environment will exhibit the problems.
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
[code]....
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Nov 23, 2014
The explanation is a bit lengthy because I just tried to explain everything in one shot.
Link to the question
java - Show a System Tray notification or Desktop notification from the web application
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Feb 15, 2015
I have the textfile which has lines:
A B 2 midterm 100
C D 1 final 90
C D 1 midterm 90
A B 2 final 80
**NO ARRAYLIST IS ALLOWED!** And the textfile is passed into the method. How to get the size for the array non-randomly inside the method from the passed Scanner file?? What if you have lots of numbers of lines, so how could that be done?
I have doubts about this line Exam[] object = new Exam[12];
Java Code:
public static Exam[] readAllExams(Scanner s) throws ArrayIndexOutOfBoundsException
{
String firstName = "";
String lastName = "";
[Code].....
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Jan 7, 2015
I want to print a text file from java by clicking on a JButton. How to use PrintJob for that?
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Aug 8, 2014
I am trying to make a method that takes in a cmd command (nslookup, systeminfo, etc), and outputs the response to a text file. I have tried a dozen different ways with no success. below is my most current failure. It succeeds when i run it, but nothing shows up in the text file.
public static void runSystemCommand(String command) {
command = "ping 192.168.1.3";
try{
Process proc = Runtime.getRuntime().exec(command);
InputStream in = new BufferedInputStream(proc.getInputStream());
OutputStream out = new BufferedOutputStream(new FileOutputStream("C:NetPanelDataping.txt"));
[Code] ....
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Jan 19, 2015
I am having trouble with reading specific lines from a text file in to a JTextArea. I want it to read only the first line of my text file and print it out in my JTextArea, however nothing is printing out.
BufferedReader a = null;
try {
a = new BufferedReader (new FileReader ("D:/FinalProjectFile.txt"));
a.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
[Code] ....
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Nov 29, 2014
I have a textfile that contient the name of items separated by blank space
Header 1Header 2Header 3Header 4Header 5javaoraclesqlphpjavasql phpphporaclejava
First i want to read the text file and I want to count the number of occurrence of each item and after that i want store the result in hashmap structure...
Example :
Header 1Header 2java3oracle2sql2PHP3
How can I do that ?
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Mar 7, 2014
Is that the only way to code the JOptionPane? Seems rather similar to Sys.out
--- Update ---
I had more than this, but post was deleted somehow and this was the gist of it:
for(i = 0 ; i < charArray.length; i++){
if(Character.isDigit(charArray(i))){
address.replace("6", "*");
address.replace("7", "*");
Is there a better way to scan a character array for digits and replace any number in the array with another character ("*") in this case? The array is the address, " 1234 Runner Road " .
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May 24, 2014
how to replace the values in my array with the results of my function factorial.
public static void main(String[] args) {
//this is my main function:
int[] array = {5,4,3,2,1};
int i = 0;
System.out.print("results: ");
for (i = 0; i < array.length; i++){
System.out.print(factorial(array[i]));
[code]....
So, what I'm trying to do is change the contents of the array "array" into their factorial value. So, they should be replaced with {120,24,6,2,1}. then add those using linear sum but that's a different story.
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Jul 24, 2014
so my task is to write a code which would ask user to input the year as integer and first three letters of the month with first being an upper case letter. Than the program would determine the number of days for given year and month.
Currently I have a brain crash on how to check, if the user has provided the month with first character being upper Case. If not, than the program would automatically correct the character. Problem starts at line 17.
import java.util.Scanner;
public class DaysOfMonth4_17 {
public static void main (String[] args) {
//Initiate scanner
Scanner input = new Scanner (System.in);
//Ask for year input and use is as INT
System.out.println("Enter the year");
[code]...
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Feb 18, 2014
I have a file which contains certain positions ([a][b]) that require to be placed in a certain multi-dimensional array. For example I might have an array String[][] that is a size of 6x6 but only have values in positions [2][1] and [3][2]. Because it is important for me to maintain the given array size and also do certain actions with the given positions I cannot modify the size. In addition I need to count the surrounding neighbors each element has (including elements that are null). However because some of my further code cant process with null elements I need to remove all null elements with " " (blank).
I am not sure how this is done or if it's even possible. If it is not possible how can I do something as close as possible to my needs?
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Feb 14, 2014
With the code below, I am trying to replace all regex matches for visa cards within a given text file.
My first test was with a text "new3.txt" exclusively containing the visa test card 4111111111111111. My objective was to replace the card with "xxxx-xxxx-xxxx-xxxx". This was successful.
However, when modifying the text file to include other characters and text before and after (ex: " qwerty 4111111111111111 adsf zxcv"), it gives mixed results. Although it successfully validates the match, it replaces the whole text in the file, rather than replacing solely the match.
When trying this search and replace with words (rather than a regex match), it does not have this behavior. What am I missing?
import java.io.*;
import java.util.regex.*;
public class BTest
{
//VISA Test
private final static String PATTERN = "(?s).*4[0-9]{12}(?:[0-9]{3})?.*";
public static void main(String args[])
{
try
[Code]...
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May 28, 2014
How can I replace each letter for example "abcde" to "edcba" with StringBuilder only and without the reverse tool. This is what I tried:
StringBuilder str=new StringBuilder("abcde");
int indexBegin=0;
int indexEnd=4;
for(int i=0;i<str.length();i++){
str.setCharAt(i, str.charAt(indexEnd));
indexEnd--;
}
System.out.println(str);
The output is:edcde with i understand why its wrong ,the last two letters already swap so it didnt take from the original str.
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Oct 2, 2014
Java Code:
public class Puppy{
int puppyAge;
public Puppy(String name){
// This constructor has one parameter, name.
System.out.println("Passed Name is :" + name );
}
public void setAge( int age ){
puppyAge = age;
[Code] ....
How do I put 3 values of the each variable without replacing the last inputted one?
Like when I input "Tommy" and input another name "Gerald", "Tommy" won't be replaced by "Gerald" when I input again.
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Oct 15, 2014
I have 2 strings
String value ="/abc_12_1/abc234/abc/filename.txt";
String src="abc"
Sring tgt=xyz
Now I have to replace the string in variable value in case of exact match; I am trying to do the following :
if(value.contains(src)
{
value.replaceall(src,tgt);
}
Now the problem here is it replaces all the occurrence of abc in the string value and I get the below output as :
value=""/xyz_12_1/xyz234/xyz/filename.txt";
However my requirement is only in the case the value exactly matches with source the replacement shd happen. I am expecting the output like this :
String value ="/abc_12_1/abc234/xyz/filename.txt";
Also the above code is in a function which will be called multiple times and the values will keep on changing. However the target and source will remain the same always.
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Aug 3, 2014
Below is a method that i want to try to renew the expiry date.
Well I'm trying to read the file and rewrite the data into the txt file, is that possible?
Java Code:
public static void renew()throws IOException{
Scanner s=new Scanner(System.in);
Scanner s2=new Scanner(System.in);
Calendar calendar = new GregorianCalendar();
int year = (calendar.get(Calendar.YEAR));
[Code] ...
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Jun 5, 2014
For an array implementation of a Hangman game I have created an array to hold the game board progress. It is initialized as "_ _ _ " where the underscores represent the number of letter in the word to be guessed. I have written the following method to replace underscores with a correct guess. It is functioning correctly in that it is replacing the underscore with a correct character guess, but it is only replacing the first time this letter appears in the word. I.e. for "greed" guessing "e" would only replace the first e: _ _ e _ _how I may be able to fix this issue.
// Updates gameboard from "_" to current guess if guess is correct
if (isCorrectGuess(move)==true){
if(inWinningState()==false){
guessProgress[charLocation] = guess;}
return true;}
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Aug 29, 2014
I'm trying to set up a splash screen where a native splash screen is shown initially and then replaced with the stage from my preloader. This is fairly simple to do. I use the below code to get everything lined up properly.
private void alignStage(Stage stage) {
SplashScreen splashScreen = SplashScreen.getSplashScreen();
if (splashScreen != null) {
// Align the stage based on the current splash location
Rectangle bounds = splashScreen.getBounds();
stage.setX(bounds.getX());
stage.setY(bounds.getY());
[Code] ....
The problem I'm having is that my Stage isn't actually shown by the time the commented event gets fired. The API for onShown says:
Called just after the Window is shown.
My guess is the window has transitioned to being shown, but there's a slight delay until it gets rendered on screen. If that's a decent assumption, is there a reliable way I can make sure my preloader stage is visible on screen before I hide the native splash?
The best option I can think of so far is to delay hiding the native splash until the preloader gets the BEFORE_START notification. This works (no flicker), but, since both splash screens are actually visible for a while, using a transparent splash doesn't work very well (which actually isn't too big of a deal).
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Mar 11, 2014
I have created a gui which accepts username in the text field and once clicking on submit button it fetches user details and throws it on gui via JTable.
But when i click submit for the second time using different username the background process goes well and good the vector that i pass to jtable changes with new data but the values in gui still contain the old data.
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Apr 23, 2015
When I hover over a JTextField, I want to change the writing cursor from this to the system regular mouse pointer. How could I do it?
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Nov 17, 2014
convert or move standalone java thread application into Tomcat server container for accessing its JNDI services? Also is it possible to schedule this thread application in Tomcat server? is it possible to keep this app in tomcat as web application and schedule in window's scheduler.
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Mar 11, 2014
I am new to work on JNLP program. I have created a SWING program, JNLP file when i deploy the ear file i am getting 404 error. Please find the steps in details.
1.Created a dynamic web project JWStartProject in eclipse
2.Create a HelloWorld.java class under default package.
import javax.swing.*;
public class HelloWorld extends JFrame {
private static final long serialVersionUID = 4968624166243565348L;
private JLabel label = new JLabel("Hello Java Web START!");
public HelloWorld() {
super("Jave Web Start Example");
this.setSize(350, 200);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
this.setLayout(null);
[Code] ....
Now I exported this project as JWStartProject.war contains following code.
Created Server in Websphere Admin console
Deployed this war file under the server and started.
I have added MIME types also.
I am unable to launch the application. I am getting 404 errors. May I know where I went wrong?
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