How To Make A Text File Only Use Lines In A Text File Beginning With A Certain Letter

Mar 15, 2015

I have a program that reads lines of text, but some of the lines of text aren't applicable and break the program. I'd like to put a letter in front of the lines in the .txt file I want to use, such as a #.

I need to make an if loop that'll check for the first letter on the line being #, and use the line in the program if true and skip if false. I'm guessing a boolean variable would be useful here to be true or false depending on the presence of #, but I don't know how to only read the first letter of each line, how can I do this?

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Change Specific Lines In Text Inputted From A File

Nov 29, 2014

I can't seem to understand how to change certain line of text, inputted from a file. For this I really don't know where to begin. I have got the input from the file. But I want to change like very other line in the file. Can't seem to understand how this could be done. Is there away to access specific lines from the file and edit them? So far, i have this:

import java.util.*;
import java.io.*;
public class ChangeEveryOtherLine {
public static void main(String[] args){
//Constructing file object representing input file
File inputFile = new File("input.txt");

[Code] .....

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For example, if I had a text file with one line such as "first, second, third", would there be a way to make it so I could make "first" go to the first array list, "second" to the second, and "third" to the third?

I haven't posted any of my code so far as it wouldn't be right to be handed the finished code on a platter and I should put the work into it, but I'd just need a loop to make it go through the rest of the lines in the text file to add all the first, second and third parts of each line, right?

(I already know how to input data from a file, but not how to split up a line into bits to put into different array lists).

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package rectangles;
import java.awt.Color;
import java.awt.Graphics;//this will draw the maze
import java.awt.Graphics2D;//
import java.io.BufferedReader;
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[code]....

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I am checking how to do following task.

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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:

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[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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Here's my code:

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package hexconvertor;
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[Code] .....

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import java.util.*;
import java.io.*;
public class textTest3 {
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*
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[Code]...

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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...

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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;
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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
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Dec 9, 2014

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public class Product
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[Code]...

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

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

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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 quanity after the second comma.....

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[import java.io.File;
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Here is my code:

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Page 1 - Gyazo - d4f7da28285f16a2a0069ac1631290fa.png
Page 2 - Gyazo - 470cf689a3126b7ab6c64bb14ae80a0d.png

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[CODE]

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