GUI Program - Read And Write To File
Oct 17, 2014
I'm rather new to programming and I'm trying to make a gui program that will allow the user to create text files. They will be prompted to enter what they'd like to save their file as and then they will be allowed to input text to that file . They will also be allowed to open their files to modify or view its contents. So to start things off, I'm making a prototype if you will.. I've been able to save to a file the problem occurs when I try to read/display it.
Main Class:
public class MainActivity {
public static void main(String[] args) {
// Access to other classes
WriteFile writer = new WriteFile();
ReadFile reader = new ReadFile();
[Code] ....
View Replies
ADVERTISEMENT
Oct 14, 2014
Write a program that reads an integer and displays, using asterisks, a filled diamond of the given side length. For example, if the side length is 4 the program should display.
*
***
*****
*******
*****
***
*
I have it where it displays the top half of the diamond. But i cannot figure out how to get it to draw the bottom half.
import java.util.*;
public class E616 {
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
System.out.print("Enter number of rows. ");
int N=input.nextInt();
[code]...
View Replies
View Related
Feb 23, 2015
Write a java program to read the time intervals (HH:MM) and to compare system time if the system time between your time intervals print correct time and exit else try again to repeat the same thing. By using StringToknizer class.
View Replies
View Related
Jun 4, 2014
I want to read and write json to/from a file. I read the following document:
JsonReader (Java(TM) EE 7 Specification APIs)
I try to define a JsonReader object in Eclipse:
JsonReader jr
But there appears to be no import for it. Where I am supposed to get the Json library?
View Replies
View Related
Jul 25, 2013
My background is mainframe and i'm new to java. We're moving from mainframe to the java world and I'm trying to achieve a task. I have a main folder and then bunch of sub folders and each sub folder has bunch of xml files, files size are varies some of them are 900kb. I need to read these xml files and send the output to the txt file (comma separated).
Some possible options or sample example... Please find below the sample xml file. I need to extract information's only where
FORM name="F00001".
[CODE]<PACKET>
<FORM name="F00001" sequence="0">
<FIELD sequence="1">02</FIELD>
<FIELD sequence="2">00000</FIELD>
<FIELD sequence="3">CAB100</FIELD>
<FIELD sequence="4">TEFAP001</FIELD>
<FIELD sequence="5">EMPTY FIELD</FIELD>
<FIELD sequence="6">009.999.989</FIELD>
[Code] .....
View Replies
View Related
Oct 10, 2014
Ex. If I type 5943, the program will say
mill = 5
hun = 9
ten = 4
uni = 3
get the picture I had to translate the decimal value names from a different language.
This is what I have tried...,
Java Code:
import java.util.Scanner;//Permite el uso de leer el teclado del usuario
public class DeterminarValorDecimal//Nombra el documento
{
public static void main(String [] args)//Podemos ver la clase
{
[Code].....
But what this does is I have to enter the single digits one by one. I want to be able to type the whole number. Is there a method that reads the length of the whole number and lets me classify each digit so I can do what I want to do?
View Replies
View Related
Feb 6, 2015
I wanna learn to create a method where I use a scanner or any other way to input.The stuffs I input will be strings. The whole thing will be like a destination creator.So if I input the string USA, it will write this to a file:
1:USA
When I go to the method again the ID will be added so if I input UK, the file will contain:
1:USA
2:UK
Now if I terminate the program, next time when I run it again it will be able to read the ArrayList, so if I wanna go to the method again and write: Norway the file will contain:
1:USA
2:UK
3:Norway
Later I also want to be able to use println to show all of these lines from the file, as well I would like to be able to delete an ID, so if I delete ID 2 the file would contain:
1:USA
3:Norway
I'm quite new to Java, I'm in a Java course since soon 3 weeks back and I have sure learned a lot, all the loops and basic statements that exist in most languages, but now when it comes to this I just don't understand.
View Replies
View Related
Apr 21, 2014
I got a question in my last interview, its all about multithreading, interviewer asked me to write a program, to write the contents of three files(F1,F2,F3) in to a new File F4, using multithreading , first thread should read the first file and second thread should read second file, so the File F4 should contain F1's contents in first then F2's contents after that etc. I tried to give my best shot, but i couldn't get a way to ensure that the first thread is reading the first file and write to F4 then second thread reading the second file and writing once first file is written completely into F4 and so on ..how to do this?
View Replies
View Related
Jan 10, 2014
What i basically do is that i read the information of what course that needs to be updated with a new course date and then i log into the wordpress page and navigate to the course and add the date.
I need the java program to be able to do these following actions.
1. Open a webpage
2. write to a form
3. click a button
4. search for a text on screen
5. click on a specific place on the screen/click on a link
6. read from an excel file.
and so on...
View Replies
View Related
Mar 19, 2014
My program successfully reads a file, reports back what it finds and creates an output file. However, I cannot get it to write to the output file, it is always blank!
Here's my code:
import java.util.Scanner;
import java.io.*;
public class Ex19
{
public static void main (String [] args)
{
//Variables
[code]....
View Replies
View Related
Jul 10, 2007
I want to create and write to a excel file from a java program. I found a tutorial online and wrote a java file as under:
Java Code: import java.io.File;
import java.util.Date;
import jxl.*;
import jxl.write.*;
public class jExcel{
WriteableWorkbok workbook = Workbok.createWorkbook(new File("output.xls"));
public static void main(String args[]){
WriteableSheet sheet = workbook.createSheet("First Sheett",0);
Label label = new Label(0,2,"A label record");
sheet.addCell(label);
[code].....
But when I compile this file, I get errors telling that package jxl does not exists and so on. Do I need to download it ?
View Replies
View Related
Mar 30, 2015
i am trying to write a program in which the user will select a text file(which contains information that the graphical output will be based). I have successfully set up my file chooser however when i select the text file,i do not get any graphical out put. please see attached .zip file for code.
View Replies
View Related
Feb 27, 2014
I have a program that is a XML-parser, and it works fine when I'm running it from NetBeans. But when I create a JAR-file and run the very same program, it cannot find the xml file. Consider this small program that addresses my problem:
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.DocumentBuilder;
[Code] .....
View Replies
View Related
Jan 12, 2014
I wrote a program to read a .txt file and return how many times a, e, s, and t occur in the .txt file. I am getting an error that I do not know how to fix. It says Error: FileNotFoundException cannot be resolved to a type...
import java.util.Scanner;
import java.io.File;
import java.io.IOException;
import java.io.BufferedReader;
public class Count
{
public static void main (String[] args) throws FileNotFoundException {
String phrase; // a string of characters
[Code] ....
View Replies
View Related
Apr 17, 2014
I've got a nasty nullpointer that I have tried to resolve to no avail as of yet. The program should prompt for a listings.txt file and take its info and write to a report file. Here's the stacktrace:
run:
Input file: listings
Exception in thread "main" java.lang.NullPointerException
at java.io.Writer.<init>(Writer.java:88)
at java.io.PrintWriter.<init>(PrintWriter.java:113)
at java.io.PrintWriter.<init>(PrintWriter.java:100)
at kettask2b.PropertyListingsReport.main(PropertyListingsReport.java:34)
Java Result: 1
Some adjustments that I have attempted are:
BufferedWriter pwfo = null;
for (int i = 0; i < args.length; i++) {
String string = args[i];
pwfo = null;
[Code] ....
Here's the code:
package kettask2b;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
[Code] ....
View Replies
View Related
Dec 3, 2014
The main method will drive your program by doing the following:
-Create an array to hold all the individual golfers and par scores (type is Golfer[ ]).
-Prompt the user for a data file containing the Par scores and the player names and score. The format of the input file should look like
Par, 3, 4, 4, 3, 4, 3, 5, 3, 4
George, 3, 3, 4, 3, 4, 2, 3, 3, 4
Paul, 4, 5, 4, 3, 6, 3, 4, 3, 5
Ringo, 3, 3, 4, 3, 4, 2, 4, 3, 4
John, 4, 4, 4, 3, 4, 2, 5, 3, 4
Your program should read the file contents and store the information in your array of Golfers.
View Replies
View Related
Dec 2, 2014
I am now stuck. I am writing a program that reads information from a data file and runs it through but program. However, I am almost finished with the program, but cannot figure out the last few parts.
public class Storm {
private final double KnotsToMPH = 1.15;
// global user-defined types:
private int beginDate;
private int duration;
private String name;
[Code] .....
I have not attached the data file because it contains a total of 360 lines of hurricane information.
View Replies
View Related
Aug 7, 2014
i am fairly new to java but have made a few projects so i do know most aspects that would allow me to complete the task its just i have been stuck at the same place now for 2 days.The project is to create a java program that can read specific data within a csv file to work out the averages etc. The csv file is a database of different weather stats . an example of the first 12 months of the csv file is below..
[CSV FILE]
year ,month,average rainfall etc
1946 15.70.616108.131.5
1946 28.23.56111.871
1946 38.82932.9 102.9
1946 414.16.3029.2 150.5
1946 513.96060.7 143.6
[code]...
I know that once the data is indexed i can than use a double to find the average of the 12 specific pieces of data and so on. once this is complete i should than be able to transfer the data to a simple graph.
View Replies
View Related
Feb 4, 2014
I am trying to do a read/write int property called currentQuestionIndex. This property is the index of the question currently selected, and the value of the property is 0 when a DrivingTest object is first created. I dont understand how to do this. I am not sure how to get the index of the current question. i was trying to use an iterator but i dont think i was doin it right. My question class that hold all my data
package cs320Labs.servlet;
public class Question {
String description;
String answerA;
String answerB;
String answerC;
int correctAnswer;
[Code] ....
View Replies
View Related
Sep 30, 2014
How can i use java for usb device? I want to read or write in a usb device in java. I've looked for in the web and i didn't find anything!
View Replies
View Related
Mar 31, 2014
I have seen different methods of creating and reading files (specifically text files) in Java. The PrintWriter method or the Formatter with a Scanner to read the file, using a BufferedWriter with a BufferedReader, etc. They will all read/write text files, but from what I understand they do so in different ways. When would it be more beneficial to use a buffered writer than, say, PrintWriter, which is much simpler code-wise? Is there a "best" way to handle i/o in general in Java?
View Replies
View Related
Mar 17, 2014
I have a question for the read and write method in file.In my code for writing i m using PrintWriter and for reading Scanner.So i m saving data to file and when is need it i m reading from the file.but i also have to delete specific data from it.Is there a way to delete a specific line from the file?When i google my problem i found that is better to save your data to temporary file and then to the final.
View Replies
View Related
Apr 15, 2015
To read or write to a USB device must use an external library?
Such as this? usb4java - About
View Replies
View Related
Aug 8, 2014
I have a database of 100,000 research articles, all as full text. From a GUI I'm building ( w. Scene Builder and NetBeans) I would like to enter a journal name and have some of the articles read into memory, in a background thread. Then I would analyze them, also in a background thread. Then I would write various results, e.g., lists of authors or titles, wordlists, to the GUI for examination by a user.
How to create background threads from my model that will read from and write to a GUI using Tasks and/or Services.
View Replies
View Related
May 29, 2014
I designed a Java desktop application (i.e the app runs on local computer), everything is fine until when I compiled the program and wanted to run it on another computer then it tell me "java.sql.SQLException: attempt to write to only read database".
View Replies
View Related
Apr 21, 2015
I have a requirement to read all the xml files from a parent folder and write in a spreadsheet(separate spreadsheet for each xml file)
I have written the below code in which xml and excel file name are hardcoded. The format of xml file is same.
package xmlexcel;
import org.apache.poi.hssf.usermodel.*;
import java.util.ArrayList;
import java.awt.List;
import java.io.*;
import java.util.ArrayList;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.SAXException;
[Code]...
View Replies
View Related
