I'm refitting a snippet of code I found on the net to write stuff into text files. After a bit of fiddling, here's what the code looks like in one of my classes:
public void addItem(String Item){
try{
Writer out = new OutputStreamWriter(fos, "UTF8");
out.append(Item);
out.flush();
// out.close();
}
catch (IOException e) {
System.out.println(e.toString());
}
}
The original snippet included the close() method. However, when I tried to do a test run writing multiple lines, I'd get an IOException about the stream being closed. I removed the close() method line, everything seems to work the way I want it, but I just wanna know if there's anything I'm missing out on by not having the close() method anywhere, especially when the IDE finds it important enough that it lit a warning about the stream not being closed somewhere as I was repurposing the original snippet.
if(Directory.getText().matches("")){ JOptionPane.showMessageDialog(null, "Please search for the directory"); } else if(fileName.getText().matches("")){
[Code].....
This is actually my question:
Java Code:
1. billing-20140527[09].txt has
a)XGMS,2014-05-27 10:08:04,122,PLAYER_VERIFY,VERIFY to LBA,0x580000,0xC0000,253040. b)XGMS,2034-05-27 30:08:04,122,PLAYER_VERIFY,VERIFY to LBA,0x580000,0xC0000,253040.
2. billing-20140527[10].txt has
a)XCGS,2014-05-27 10:08:04,122,PLAYER_VERIFY,VERIFY to LBA,0x580000,0xC0000,253040. b)HELO
[B]I try to find the number 1 in both text files, if lets say I input the text file name is billing, I can find the number 1 in both text file and output them:[/B]
a) XGMS,2014-05-27 10:08:04,122,PLAYER_VERIFY,VERIFY to LBA,0x580000,0xC0000,253040. b) XCGS,2014-05-27 10:08:04,122,PLAYER_VERIFY,VERIFY to LBA,0x580000,0xC0000,253040.
[B]However, if I specify the text file name: billing-20140527[09].txt and find the number 1 inside the text file, it will only output:[/B]
a) XGMS,2014-05-27 10:08:04,122,PLAYER_VERIFY,VERIFY to LBA,0x580000,0xC0000,253040. mh_sh_highlight_all('java');
I'm trying to write information into a file using PrintWriter. The program complies correctly but when it get's to the following part of the program, an error is given. "Exception in thread 'main' java.io.FileNotFoundException" What is wrong with it?
System.out.print("Enter the filename:"); filename = kb.nextLine(); PrintWriter outputFile = new PrintWriter(filename); outputFile.println(balance); outputFile.print(item1+" "+item1Price); outputFile.println(" "+item1Quantity); outputFile.print(item2+" "+item2Price); outputFile.println(" "+item2Quantity); outputFile.print(item3+" "+item3Price); outputFile.println(" "+item3Quantity); outputFile.close(); System.out.println("Data written to the file.");
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?
I have to write a diff which will compare two txt files, diff have to return changes and additional lines in console with indicating in what file and line.
I'm trying to use graphics for my programs and here I'm trying to write a program that searches through files for text received from a JTextField. However, it does not seem to be working as my message is not displayed when text is found...
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
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?
I'm supposed to write a computer based testing program using files. I have started writing however, I am stuck. I am to prompt the user to enter the file name 'test.dat" and if something different is entered then a error message should be displayed. Also the file will create an input stream for the data using the file. I am to have the user enter other information about an employee and then write the record to the file.
The program should be created so when the user enters "quit" the loop is terminated and the file is closed. I'm not asking for code. I was just giving a brief synopsis of the project. Where I am stuck is I wrote the first part of the program that creates the file; however when I enter a wrong file name the exception error message does not display. The code is below:
import java.io.*; import java.lang.*; import java.util.*; public class Project5Write { private Formatter x; public void openFile(){
I wrote a simple random spelling game for a class project, was never able to get the labels to update when they should. I have tried .updateUI, .paintImmediately followed by .revalidate and by .repaint. Nothing seems to be working.
What the game does is show a random word for about 10 seconds, disappear and they user is to spell that word, you have 3 tries then will start over. The "brains" of the game work just fine, it is the labels updating with new text when they should doesn't seem to be working. There is 4 classes but the below is the "Main" that has the problems. Also have a null exception problem with the timer.stop(); not sure why. I am still pretty new to java.
Public class SpellMe extends JFrame { // variables JPanel mainPanel, secondPanel, thirdPanel; JLabel mainLabel, wordLabel; String spWord, sp; JTextArea guess;
I extended the SimpleFileVisitor class. And I am able to traverse the file directories. I give a file path then have it display the files full path and out put that to a text file. Here is what i have so far.
public class Main { public static void main(String[] args) throws IOException { Path fileDir = Paths.get("somedirpathhere"); FileTraversal visitor = new FileTraversal(); Files.walkFileTree(fileDir, visitor);
[code]...
I am able to printout of the arraylist to the console. I cant get it to write to a text file whats in the arraylist to a text file.
I am getting a nullpointer exception after "cleaning" up my code by putting repetitive stuff in a method.
The error points to this: ai.getItRight(n, answer);//make sure the user enters yes or no..
The error occurs at lines 19 and 25.Here is the relative code:
public boolean AskQuestions(Node n, String yesOrNo, String answer, String question){ if(yesOrNo.equalsIgnoreCase("no") && n.getRight() == null){//i guessed the wrong answer System.out.println("I give up. Who is it: "); answer = input.nextLine();
[code]....
My previous code, which use to have the contents of getItRight in place of lines 19 and 25 worked just fine. So why am I getting this error? I dont want my methods to be crazy big like how they usually end up.
So I have a text file, and I want my Java program to store names from the text file. How do I do that? This is what I have so far.
Java Code: import java.util.Scanner; import java.io.File; BingoCard[] cards = new BingoCard[n]; //Array of BingoCard objects, n being the length of the Array Scanner sc = new Scanner(File("Names")); //Names is the name of the file for(int c = 0; c < cards.length; c++) cards[c] = new BingoCard(sc.nextLine); mh_sh_highlight_all('java');
Here's the constructor.
Java Code: private string myName; public BingoCard(String name) { myName = name; } mh_sh_highlight_all('java'); Whenever I compile, I get this error message.
**Here is my question. I'm trying to use input and loop method to search for a file. The above code works but my problem is lets say I try to find 2 different text files**
1. billing-20140527[09].txt has
a)XGMS,2014-05-27 10:08:04,122,PLAYER_VERIFY,VERIFY to LBA,0x580000,0xC0000,253040. b)XGMS,2034-05-27 30:08:04,122,PLAYER_VERIFY,VERIFY to LBA,0x580000,0xC0000,253040.
2. billing-20140527[10].txt has
a)XCGS,2014-05-27 10:08:04,122,PLAYER_VERIFY,VERIFY to LBA,0x580000,0xC0000,253040. b)HELO
I try to find the number 1 in both text files, if lets say I input the text file name is billing, I can find the number 1 in both text file and output them:
a) XGMS,2014-05-27 10:08:04,122,PLAYER_VERIFY,VERIFY to LBA,0x580000,0xC0000,253040. B)/> XCGS,2014-05-27 10:08:04,122,PLAYER_VERIFY,VERIFY to LBA,0x580000,0xC0000,253040.
However, if I specify the text file name: billing-20140527[09].txt and find the number 1 inside the text file, it will only output:
a) XGMS,2014-05-27 10:08:04,122,PLAYER_VERIFY,VERIFY to LBA,0x580000,0xC0000,253040.
How can I do so? Because I can output the number 1 from both text files even though I specify the name.
I've written a program to read files in a directory but I'd like for it to only read the text files of that directory.
import java.io.*; public class Data { public static void main(String[] args) throws IOException { String target_dir = "C:files"; File dir = new File(target_dir); File[] files = dir.listFiles();
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.
I need to write a program where the user inputs name, age, email, and cell and write the user inputs to a text file. I need to have it so the file can be added to if more than one set of information is added. Currently, every time I click the button, the file is overwritten instead of added to. How do I correct this? Current code is as follows:
I just went over how to open and edit text files in java. Was wondering how to open mp3, mp4 and other media files, is there a special package i need to import or plugin that I need to install in eclipse?
Why is it simple for a word processing software (one that reads number of words, words greater that x characters etc) to deal with text file(.txt) and not with a doc file (.doc) file?? Is there any special requirements or what are the points taken into consideration while developing the software for a .doc file?
I've been trying to write a program for some time now, but im encountering problems while trying to complete it. The program has a student class and a course class (set up with some info about the class, like #, professor name, course title, course time). Now, i have a text file in the workspace, and i have to import the data from the textfile, and thats just what i did, but then there is an option which allows the user to delete a course only by inputing the course number, and when he does that, the program outputs the course's name, and confirms the deletion of the course (From the student's record, i created a vector for that and imported all the courses from the text file). But how can i let the program know what's the name of the course when the user inputs the course number ???
When the data is read from the file, objects should be created and added to the student's course record. <- i think here's where i messed up ? i imported the data, but how can i actually make them objects before adding them into the vector ?
PHP Code:
public static void main(String[] args) throws IOException { Scanner scan = new Scanner(System.in); Vector Record = new Vector(); try {FileReader filereader = new FileReader("CLASSES.txt"); BufferedReader bufferedreader = new BufferedReader(filereader); String test = ""; while(test != null) { Record.addElement(test); test = bufferedreader.readLine(); } mh_sh_highlight_all('php');
I have problem with my simple program. I tried put some text in my text area using button1 but textListener in RighButtons is always null and it's give me NullPointerException.
WriteToArea - interface public interface WriteToArea { public void add_a(String text); } BaseFrame public class BaseFrame extends JFrame{
I am writing to a file coordinates of texts using PathIterator (Java Platform SE 7 ) saved as SVG format i defined the Font attributes using AttributedString (Java Platform SE 7 ) and TextLayout (Java Platform SE 8 ). It is saving to the file and working properly, but it is just writing as a single line of text where is my target is multiple lines of text, i began using LineBreakMeasurer (Java Platform SE 7 ) Class, but some text is removed plus i got single line of text only, where i face the problem that , How to determine the width to get multiple lines of text ? i tried to figure out from this exampleDrawing Multiple Lines of Text (The Java - Tutorials > 2D Graphics > Working with Text APIs) where is drawing multiple lines of text but i am using getBounds().getWidth() of TextLayout object the code i tried