How To Read Data From Text File And Place Into Array

Nov 15, 2014

I'm trying to figure out the necessary code for reading integers from a text file, then placing them withing the two-dimensional array I have created, and then finally printing the array using a nested for-loop. I have attached the file I would like to read from. I'm having trouble figuring out how to reference the text file with the integers, and also how to properly create a dynamic preface for each row of the array. I want the preface to display as "Week #: ", with # being the row number. I tried to create an integer to be used that way, but NetBeans tells me whatever integer I declare has already been defined in method main. I know I need to use scanner to read the file. I would like the output to display like this:

Quote
Temperature Data

Week 1: 73 71 68 69 75 77 78
Week 2: 76 73 72 72 75 79 76
Week 3: 79 82 84 84 81 78 78
Week 4: 75 72 68 69 65 63 65

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Read Data From File And Place Larger Of Two Numbers In Corresponding Position Of Third Array

Apr 14, 2015

I am learning about arrays in my class and my professor has a habit of throwing in code without explaining. We are doing a program called storing largest numbers where we read data from a file and place the larger of the two numbers in the corresponding position of a third array. They are in 4 by 4 format. Here is the ending code

import java.io.*;
import java.util.*;
public class prog464aStoringLargestNums
{
public static void main(String[] args)

[code]....

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Read Text File Into Array Ask User To Save File And Print Data

Jul 14, 2014

New to programming. Am supposed to create a program that reads a text file (of integers) and computes a series of computations on these integers. I don't have the code for the integers in my code yet, (i know how to do those), but am struggling getting the array to simply print in the print writer. I have the user select a text file, read the file with a scanner, and then save the computations done from my code into another file. specifically, the problem is as follows: Write a program that uses a file chooser dialog to select a file containing some integers. The file contains an integer N followed by N integers. The program then uses a file chooser dialog to let the user specify the name and location of an output file to write results to.The data written to the output file will be as follows

(1) The original list of N numbers from the input file,
(2) The original list of N numbers printed in reverse order of how they appear
in the input file.
(3) The sum and average of these numbers,
(4) The minimum of all the numbers,
(5) The maximum of all the numbers.

[import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;

[Code]....

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Read Text File Into Object Array And Creating Random Access File

Dec 8, 2014

I am working on a project that requires me to build a database with random access file, representing products, the base product contains a name (about 30 characters), a price (double), and a quantity (integer). I have worked on this project for probably 15+ hours and have tried so many things and feel like I've barley made any progress...

The part i am really struggling with is taking the data from the text file and creating an object array with it using the product class. Once ive accomplished that, i have to use that data to create a random access file with the data.

Here is the base Product class that must be used to create the objects for the array.

public class Product
{
public String pName;
public String stringName;
public double price;
public int quanity;

[Code] .....

And then here is the data from the text file that i must extract to use to create product objects.

Dill Seed,938,34
Mustard Seed,100,64
Coriander Powder,924,18
Turmeric,836,80
Cinnamon (Ground Korintje),951,10
Cinnamon (Ground) Xtra Hi Oil (2x),614,31
Cinnamon (Ground) High Oil (1X),682,19

These continue for about 40-50 entries, they are not separated by a blank line though i had to add those so it would display correctly, each entry is on its own line with name separated with spaces, then price after a comma, then quantity after the second comma.....

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How To Read Text File Into Array

Nov 17, 2014

I have to write a program for sorting an array of random numbers by the users choice. These random numbers are stored in a text file, which the user inputs, and is then stored into an array for sorting. I won't have a problem with the sorting algorithms, but I've never had to read a text file and store it into an array before

The text file has the numbers stored like so :
148
626
817
4
312
652
643
etc....

I gather that I'll probably have to user the Scanner for the user to input the text file name, but how do I store it to an array? So far I only have the bones of the program done, like so

import java.util.Scanner;
public class SortingAlgorithms {
public static void main(String[] args) {

[Code].....

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Read Text File And Put It In 2D Array

Oct 25, 2014

I am trying to read in lines of text from a file then prints out the text. I only need one 2D array and can't copy from one array to another.This how the file looks like:

4 4
FILE
WITH
SOME
INFO

I have been able to read the file but when I am trying to run my program I have blank spacing instead of an array.

import java.util.Scanner;
import java.io.*;
public class Array {
public static void main(String[] args) throws IOException{

[code]....

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Read Numeric Values From A Text File Into Array

Oct 28, 2014

I am trying to read numeric values from a text file into an array. This is what i have so far but when i compile it, it doesn't run and give me a result.

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;
public class question2_17110538 {

[Code] ....

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How To Read Text File In Array And Show It To Textfield

May 30, 2014

I have a problem about read text file in array and show it to textfield :

Content the file:

I want read line 1 to textfield 1, line 2 to textfield 2,....

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Pickup Selected Text File And Read Line By Line And Output Text Into Visual Text Pane

Dec 12, 2014

I am checking how to do following task.

01. pickup the selected text file and read the line by line and output the text in to visual text pane.

what i did:.

01. I wrote code that read the text file and output in to jave console/ also some of the interface.

the code read txt file:

Java Code:

String fileName = "C:/Users/lakshan/Desktop/lawyer.txt";
File textFile = new File(fileName);
Scanner in = new Scanner (textFile);
while(in.hasNextLine()){

[code]....

so it will read any text file dynamically and output to the text pane in interface. I think scanner code must be execute after the select the file from the browser and set the scanned result in to variable. then later out put the var as string in some jswing component?

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Read A Text File And Split The Text Into Tokens

Feb 2, 2014

I am trying to read a text file into Java and split the text into tokens. Eventually I want to be able to count the number of instances of a specific word. However, at this point, when I run the file, all I get is the location of the file rather than the text in the file.

import java.util.*;
import java.io.*;
public class textTest3 {
/**
* Prints the number of words in a given file
*
* @param args
* @throws IOException
*/

[Code]...

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Read Text And Extract Data And Display It In JTables?

May 20, 2014

My problem is to read a text file which contains lines of text data

{e.g: #1115=CLOSED_SHELL(",(#166,#208,#250.....#1114));}

I need to break it and #numbers in braces are assigned to string array and they should cal by one by one. similarly next level on calling #166 same operation should perform

{#166=ADVANCED_FACE(",(#165),#129,.F.);}

like this 8 levels were there, finally at each level the Calling number should display in JTable.

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How To Read Particular Column From Text File

Mar 3, 2014

personid gender height class
1 female 1.6 short
2 male 2.0 tall
3 male 1.85 medium
4 female 1.9 medium
5 male 1.7 short
6 female 1.8 medium
7 female 1.95 medium

for eg i have to find minimum and maximum height from column height.

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How To Read Text File In Java

Aug 23, 2014

How to read a text file in Java?

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Trying To Read In A String From Text File

Nov 17, 2014

So I am saving a file. it is an array of two strings each containing three words. i figured out how to save to a text file and read it back in and put it back into an array. I am using scanner.hasnext and scanner.next and i think that separates the strings into variables using the spaces in the strings. Well for my project i need to do it with a symbol instead of a space

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.Writer;
import java.util.Scanner;

[Code] .....

I put some comments in the read method so you can get exactly what im trying to accomplish....

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Read Text File And Allows Analyzing

Oct 22, 2014

Write a class TextAnalysis14 which reads a text file and allows some text mining(Analyzing). Concretely the program has to support

1. total the number of words,
2. checking whether a word is contained in the text,
3. finding the most frequent word, or words in case there are more than one.

A word is a non-empty string consisting of only of letters (a,. . . ,z,A,. . . ,Z), surrounded by blanks, punctuation, hyphenation, line start, or line end. The analysis is case-sensitive.

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Data Read From File And Being Placed Into Arrays

Feb 8, 2015

I am creating a program where it reads the data inside a file and then places this data into arrays. The file I created has numbers 1-30 in it, file named, testing1.txt .

I am unable to post my code, it redirects me to a 'Page not found' page.

The problem with my program is a variable that I have initialized, is being said its not being initialized.

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How To Read In A File And Extract Data

Nov 15, 2014

I am supposed to read in a file and extract the data. I am trying to add a Long into an Array that I initialized. So this is how my method looks like :

Java Code:

public void readOSMWay(File osm){
try {
Scanner output = new Scanner(osm);
while(output.hasNext()){
String line = output.nextLine().replace("^s+","");
if(line.startsWith(" <way")){
Road way = new Road(line,true);

[Code]...

I am having problem with the else if block. I am supposed to add all the Long values into the array.

error: Java Code: The method add(Long) in the type ArrayList<Long> is not applicable for the arguments (String) mh_sh_highlight_all('java');

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Read Entries Of Matrix From A Text File

Mar 9, 2014

Assignment: Develop a GUI-based program to read the entries of a matrix from a text file. The first number is the number of rows; the second number is the number of columns. The remaining numbers are integers between 1 and 9 in row by row order. Scan the matrix, highlight (display the entries in different color) all cells that form a group of five cells with the same value horizontally, vertically or diagonally.

Example of text(.txt) file:
7 7
3623161
3666669
3936293
3594955
3289867
2493998
1399998

Example of output:
3623161
3666669
3936293
3594955
3289867
2493998
1399998

* ^^this would be what it would look like when displayed in the GUI. But it would be colored. Anything that has 5 in a row ...My Class File:

// GUI-related imports
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Scanner;
// File-related imports

[code]....

EX.
0=black(when there is no combo. of 5)1=blue(horizantal combo of 5)2=red(vertical combo of 5)3=green(right diagnol combo of 5)4=purple(left diagol combo of 5)

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How To Read Numbers And Names From A Text File

Mar 20, 2014

I have a text file containing numbers and names as shown in the example below:

61133128805241Albert Rosenberg
64763645543509Joel
79256337754219Michael Burton

I'm making a program that will read the file and put the numbers in a list of int arrays and names in another list of strings. In my program i created two classes. One will receive the numbers and the other will receive the names. But i only can read the numbers! How can I read everything and separate into two different lists?

try( BufferedReader br = new BufferedReader( new FileReader( jFileChooser1.getSelectedFile().getAbsolutePath() ) ) ) {
hist = new Historic();//Will recieve the array of numbers.
while( br.ready() ) {
int line[] = new int[ 7 ];

[Code] ...

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Write And Read Via ArrayList With Text File?

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.

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Writing Object To File And Then Read It In Text

Mar 18, 2014

I have problem with writing objects to file. The thing i want to do is write object(Measur) and then read it from Notepad++. Not from program, but normally from computer. When i'm opening my file i see patterns(i dont how to call this). I think, that I need write it as a string in some way. There is my code:

Java Code:

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;

class Task3 {

[code]....

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Use Data Read From File To Create Instances?

Sep 10, 2014

"Write a program (save the program as ProductInventory.java) that will read data about 5 products from a text file (Products.txt. The program should use the data read from the file to create instances (objects) of Product.java(Use Product class as a Reference Type)."

I'm yet to discover how I will get the info from the textfile using scanners but I don't know how to "create instances of a reference type".

This is the code of Product.java that came with the exercise.

public class Product {
private String productCode = "";
private String productName = "";
private int quantity;
private String supplierName = "";
private String supplierAddress = "";
private double price;

[Code] .....

By the way, the exercise also required me to use the abstract class ProductLister. To be clearer, the text file is kinda like this:

54643
Rizer Mouse
Mark5s Merchandising
Marquee Mall
4
205.50
23412
Acer Ultrabook
JohnJade Merchandise
Cornal City
2
62200.00
93112
Dell Ultrabook
Octagon Marketing
Cornal City
3
68900.00
22126
Macbook Air Pro
Computerware Services
San Beda, Chad
2
93500.00

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To Decrypt Data - File Containing Keys Is Not Being Read

Aug 27, 2014

I am developing a java code using netbeans for encryption decryption by RSA algorithm. Swings and file handling play a major role in these code. My encryption code is working nicely but the code for decryption is not since keys file is not being read. That is why variable mod and pri are getting null values and the following error stack is coming. I know where the problem is somewhere in void readkeys() function but cannot solve it.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at java.math.BigInteger.modPow(BigInteger.java:1579)
at rsakeydecryption1.RsaKeyDecryption.decryption(RsaKeyDecryption1.java:167)
at rsakeydecryption1.RsaKeyDecryption.read_output(RsaKeyDecryption1.java:294)
at rsakeydecryption1.RsaKeyDecryption.actionPerformed(RsaKeyDecryption1.java:330)

[Code] .....

My code for decryption is

package rsakeydecryption1;
import java.math.BigInteger;
import java.util.Random;
import java.io.*;
import javax.swing.*;

[Code] ....

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Best Way To Read Data From CSV File Then Compare And Display

Jun 13, 2014

I have 3 csv files as follows -

author file columns - emailID | firstname | lastname
books file columns - title | isbn | author_email | description
magazine file Columns - title | isbn | author_email | releasedate

I need to display -

1) Based on the ISBN display all books and magazines
2) All books and magazines by an author
3) All books and magazines by title

I am using Buffered reader as of now -

String csvFileToRead = "csvFiles/authors.csv";
BufferedReader br = null;
String line = "";
String splitBy = ";";

[Code] ....

I am confused about how to proceed with multiple files. Here are the approaches that i have considered -

1) change string csv csvFileToRead to a string array -

String[] csvFileToRead = {"data/autoren.csv", "data/buecher.csv", "data/zeitschriften.csv"};

Pass each index each time to a method returning all rows but getting stuck with DS to use. I think ArrayList wont suffice since i need separated data. Should i use a 2D array? Do i need to read and store data in a DS in order to achieve the goal?

2) Should i make 3 different classes with getters and setters for authors, book and magazine?

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How To Read Data From Random Access File

Jul 10, 2014

I have a random access file stream. I have below code I want to written data that is currently pointed by pointer till the end and display that data on System.out Stream but it is not working my code is

//Create a Random Access File
java.io.RandomAccessFile random=new java.io.RandomAccessFile("D:/input.txt","rw");
//Position the pointer to a seek
try {
random.seek(300);
long pointer=random.getFilePointer();
System.out.println("Current Pointer is:"+pointer);
int a;
while((a=random.read())!=-1) {
System.out.println(a);
}

Where am I wrong? Although it is returning actual position of pointer in pointer using

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I/O - Read 11 Values From A Text File / Each Value On Separate Line

Mar 26, 2014

So I'm trying to read 11 values from a text file, each value on a separate line. The first value I use as loop control to run through calculations on the other ten and finally output both the numbers and the calculations to the console and an output file. I'm not getting a compiler error or a runtime error but my loop seems to stop after reading the first line. It also doesnt seem to be writing to my output file but does create it when I run the program. This is what my text file looks like

10
150.4
88.4
-3.14
499.4
799.4
1299.8
0
1900.2
901.7
4444.4

This is what my program looks like

import java.util.*;
import java.io.*;
 public class assignment7scratch
{
  Toolkit_General toolKit = new Toolkit_General();
  public static void main (String[]args)throws IOException

[Code] .....

so I dont get an error but this is what my output looks like

----jGRASP exec: java assignment7scratch

This program reads a list of values representing number of miles driven by individuals. It will output the dollar amount their rental cars cost.

Number of miles traveled on the left as well as amount reimbursed on the right

-----------------------------------------------
Miles Driven Amount reimbursed
150.427.072

----jGRASP: operation complete.

it also doesn't write anything to my output file, though it does create one.

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