Java IO File Reader / Writer
Feb 2, 2015
I've been working on a saving system for a game I'm working on using java IO writer and reader. When I tried exporting it (as a executable jar) to test I couldn't get it to work, when it worked before. If I had to guess it's the file location not being able to find the file. Which it just looks like :
FileReader end = new FileReader("Saves.txt");
I don't exactly know how to set it up to read the file. I'd tried giving it a look up but I don't know how to exactly word my problem.
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Sep 22, 2014
Trying to write to a txt file using buffered writer - however I'm getting some issues.
BufferedWriter says 'The resource type BufferedWriter does not implement java.lang.AutoCloseable'
br says 'The type BufferedWriter is not visible'
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
public class FileWriter {
public static void main(String[]args){
[Code] .....
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Apr 2, 2014
I am using netbeans to create a hotel booking system, just tessting out code to get the booking information input to a file when the next button is clicked.
File file = new File("file.txt");
try (BufferedWriter br = new BufferedWriter(new FileWriter(file))) {
br.write("################################");
br.newLine();
br.write(" Booking Information");
br.newLine();
br.newLine();;
br.write("First Name: " + TxtName.getText());
} catch (IOException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
Nothing is getting wrote to the file though. Does that code seem right?
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Apr 25, 2014
I am completing a USACO online problem and am trying to create a print writer to write to my file(ride.out). I did this:
PrintWriter out = new PrintWriter(new BufferedReader(new FileWriter("ride.out")));
However, a load of undefined constructor errors come up for PrintWriter(BufferedWriter) and BufferedWriter(FileWriter). I have imported java.io.* so I don't know what the issue is. This has worked before.
edit: bufferedreader? i give up(not literally)
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Apr 10, 2014
I am trying to write to an output file that the user names. I have flushed and closed the printwriter, so now I am at a loss. The console output works fine with the formatting, and the file is created, but I cannot get the file to populate. I have the following:
public static void main(String[] args) {
try
{
Scanner kb = new Scanner(System.in);
System.out.print("Input file: ");
String inputFileName = kb.next();
System.out.print("Output file: ");
String outputFileName = kb.next();
// Construct the Scanner and PrintWriter objects for reading and writing
File inputFile = new File(inputFileName);
Scanner in = new Scanner(inputFile);
PrintWriter out = new PrintWriter(outputFileName);
[code]....
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Jul 18, 2014
I have a text and I am reading each line in the text with the simple while loop:
BufferedReader br = new BufferedReader(new FileReader(new File(a.txt)));
string line = new String();
while((line = br.readLine())!=null){
if(line.equals("john"))
//skip to next line
else{
//continue something else..
}
}
My question is how do I skip to the next line ? Using apache.commons.io.FileUtils; one could easily have done something like this:
LineIterator it = FileUtils.lineIterator(file, "UTF-8");
String line = it.nextLine(); //this goes to the next line..
How can this be done using BufferedReader ?
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Oct 29, 2014
ive been working on a poker game in java but seem to have got stuck in my 3 of a kind. What I was trying to do was create a loop that would increment a counter every time time is more than 1 instance of a card, but even if the counter increments and I draw a 3 of a kind it still returns false.
private boolean ThreeOfKind(ArrayList<Card> sortedCards) {
Card previousCard = null;
for (Card c : sortedCards){
int kindcount = 0;
[code]....
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Feb 18, 2015
How do I make the file reader object move to the next line if there is no more input on the line. Here is my text and output file as you can see that my text file column cuts off on the 2nd line after 70. I want to read that next line which is 100 into my labs variable however its reading it into my final exams variable. I'll also post the code but I didn't think it was necessary.
textfile:
100908095
1008070
10070
output:
Labs Projects Tests Final Exams
100908095
1008070100
70
[import java.util.Scanner;
import java.io.*;
public class MyGrades
{
public static void main (String[] args) throws IOException
{
int lab, project, test;
int finalExam;//Par and Player values
[Code]...
not sure if I code wrapped it correctly
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May 23, 2014
I put the code on pastebin.com because it is relatively long. How to improve this code that does not occur starvation and was ucziwy terms of writers and readers.
[URL] .....
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Apr 10, 2015
how to use a Scanner to read data from a file. Is it possible to also average a set of numbers at the same time its being read?
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Mar 5, 2014
a buffer reader , how does it work and what is the code for it ?
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Feb 16, 2015
I have to make an application called miles to meters that converts miles to meters that asks for user input through joption pane and the output can be eather system.out.println or joption pane, I found the code i need but it uses buffered reader for input not joption pane. Here is the source code
import java.io.*;
import java.util.*;
class MetersToMiles{
public static void main (String[] args)throws
Exception{
// 1 meters = 0.00062137119 miles;
[Code] ....
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Nov 3, 2014
I've got a .csv file with some text and numeric data. I've used BufferedReader to successfully print the data to the console. Now I need to perform mathematical operations on the numerical data. How do I access the data from the BufferedReader in my calculation methods?
This is what my BufferedReader looks like:
ReadCVS obj=new ReadCVS();
obj.run();
}
public void run(){
String csvFile = "myDataSet.csv";
BufferedReader buffread=null;
String row="";
[Code] .....
What I would like to be able to do is create some loops to calculate totals for some of the elements, but I'm not sure how to access the data from other methods (and potentially classes?).
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Oct 13, 2014
I am trying to read the following input (which will be inputted by the user when run) using the BufferedReader approach:
1
*** * * * *** *** *** ***
* * * * * * * * *
* * * *** *** *** *** ***
* * * * * * * * *
*** * * *** *** *** ***
I am reading each line of the input one line at a time and incrementally storing four char positions into an array, so i am able to hold a vertical representation of each column. I.e. column 1 will be stored in array[0].
The problem with my code is that is does not read the last line of the input, it reads all the other inputs before it but just refuses to read the last line and execute the procedure of storing the characters.
Code:
public void defuseBomb(){
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
System.in));
String asciiLine = reader.readLine()+ " ";
int digit = (asciiLine.length())/4;
[Code] .....
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Mar 12, 2015
String name="admin";
String fpass="";
try {
BufferedReader in = new BufferedReader(new FileReader("D:Dairy MangamentNew1 Dairy ManagmentPassword.txt"));
fpass = in.readLine();
in.close();
} catch (Exception e) {e.printStackTrace();}
[Code] ....
Its not comparing the user name and password..
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Mar 12, 2014
what this code means?
public static String readBuffer(Reader reader, int limit) throws IOException {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < limit; i++) {
int c = reader.read();
if (c == -1) {
return ((sb.length() > 0) ? sb.toString() : null);
[Code] ....
I am particularly confused with the below lines -
if (((char) c == '
') || ((char) c == '
')) {
break;
}
This is how I am calling this code from my application -
BufferedReader bf = null;
StringBuffer stringBuff = new StringBuffer();
String ln = null;
while ((ln = readBuffer(bf, 2048)) != null) {
stringBuff.append(ln);
}
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Dec 8, 2014
I'm making a tree of contacts with people's names as one string and their numbers as another. I need to read that in from a .dat that is set up to have two columns, across from the names are the numbers, so i have to read that in, but I'm not sure how. Here is what I have:
Tree<String, String> tree = new Tree<String, String>();
BufferedReader br = new BufferedReader(new FileReader("/Users/katedess/Desktop/animals.dat"));
String read;
while((read = br.readLine()) != null) {
tree.add(read);
}
br.close();
}
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Feb 26, 2015
try {
File configFile= new File("C: Documents and SettingsstudentMy DocumentsNetBeansProjectsCDASsrcconfig.xml ");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
doc.getDocumentElement().normalize();
NodeList nList = doc.getElementsByTagName("config");
[Code] .....
This code is working properly but i have use path like this
File configFile= new File("srcconfig.xml");
Instead of system directory path i have to use path inside of project but i am getting an error-cannot find the specified file...
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Dec 1, 2014
In my web application i want to upload file to drop-box. I am getting file name from browser.Is it possible to upload file to drop-box with only file name.
Below the drop-box upload code with java.
File inputFile = new File("New Text Document.txt");
System.out.println("inputFile.getAbsoluteFile(): " + inputFile);
FileInputStream inputStream = new FileInputStream(inputFile);
try {
DbxEntry.File uploadedFile = client.uploadFile("/magnum-opus.txt",
DbxWriteMode.add(), inputFile.length(), inputStream);
System.out.println("Uploaded: " + uploadedFile.toString());
} finally {
inputStream.close();
}
In the above code the place New Text Document.txt we have to provide total path of file.
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Jan 18, 2014
I want to know can we put the data of html file example
<html>
<body><applet code="classname" width="100" height="100">
</applet>
</body>
</html>
into my Applet's java file it can be done i have read it somewhere and have also implemented it ..... but now unable to memorize it
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Jan 25, 2015
I have a java assignment concerning formatting. I know I have no syntax errors but that doesn't mean that my formatting is correct and I can't figure out how to create a .txt file and view my code in notepad just to verify the formatting.
public class Assignment1b {
public static void main (String[] args) {
String[] header = {"Wilson", "Office", "Supply", "Inventory", "Listing"};
String[] columnhead = {"Number", "Description", "Price", "Qty", "Net Price"};
String[] line1 = {"AB35", "Swingline Stapler", "19.95", "125", "2493.75"};
String[] line2 = {"CP05", "Canon Copier", "329.65", "175", "57,688.75"};
[Code] ....
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Jul 3, 2014
I need to use a some function which is already there in a jar file in another java.
for example,
Consider a jar file created from a java file in which only one constructor is there say SHA (String message).
I need to use this SHA method in another java file.
How to import the jar file to the existing java file? import .....
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Apr 9, 2015
I've written a java application with several classes all in the same .java file. It works just fine. Now, I've broken it up so that each class has its own .java file. Still works fine. My next step is to put those classes into a package, but I'm not about to get the program to run.The .java source files are all in /home/user/src
I've set the CLASSPATH to /home/user/src..All of the source files have "package com.myfirm.program" on the first line.I compiled the application with:
javac -d . File1.java File2.java File3.java (etc...)
the compiler created the directory: /home/user/src/com/myfirm/program and put all of the .class files in there.So how do I get the program to run? if I run from /home/usr/src
java File1
I get: Exception in thread "main" java.lang.NoClassDefFoundError: File1 (wrong name: com/myfirm/program/Program)
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Apr 14, 2015
I create 2 files:
CircleCalculationMethod.javaMain.java
In Main.java, How can i call method in CircleCalculationMethod.java ?
Should I put everything in same folder ??Should i do something like "import CircleCalculationMethod.java"Should i do something like create a package ...
I use Eclipse software
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Oct 7, 2014
How to split an XML file in java? what function and package should we use?
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May 25, 2015
Need to know how i can store a value in File which is in Properties?
Here I am placing my Properties code :
ReportHTML C:/bea/user_projects/domains/OICDomain/applications/IIMS/IIMS/target/source/REPORT_HTML_DUMP/
ReportEXCEL C:/bea/user_projects/domains/OICDomain/applications/IIMS/IIMS/target/source/REPORT_EXCEL_DUMP/
My Java File :
File destHtmlFolder = new File("C:/bea/user_projects/domains/OICDomain/DOC_SERVER/REPORT_HTML_DUMP");
File srcExcelFolder = new File("C:/bea/user_projects/domains/OICDomain/applications/IIMS/IIMS/target/source/REPORT_EXCEL_DUMP");
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