Changing Value In Specific Point Of Specific Line In TXT File
Feb 9, 2015
So here we go with my problem:
- from the main class will arrive three variable (String name_used, int level_choose, int level_result)
I have a .txt file with this kind of formatting:
mario 1 1 0 1 0 1
carlo 0 0 0 1 1 0
...
Where I use 1 and 0 in the main for write if the level (you see that the numbers are always sixr? are egual to six level existing) BEFORE is done correct or wrong
- when in the main a user make a level a feedback coming back from the class level saying if the user made the count correctly or wrong. and i wanna replace the value (1 or 0) in the txt file with the new level result.
So i have all what i need as parameters i think.
name_used to look for the correct line in .txt file with .indexOf
level_choosed to go throught the correct index of that line
level_result (1 or 2) to be replaced with the existing one
Java Code:
public void salvaRisultati(String name_used, int level_choosed, int result_of_level) throws FileNotFoundException{
}
} mh_sh_highlight_all('java');
I have some problem to understand the way to make this:
In my main class a user can save his name in a txt file (and the system initially will add 6 value equals to 0) than he can choose between 6 level and make it.
example of .txt file data:
mario 0 0 0 0 0 0 carl 0 0 0 0 0 0
AT THIS MOMENT i just made other class and they work, is this new one that is hard for me. I'm trying to make a class that:
1- (first method called verificaRisultati) take name_used and level_choosed from the main and go to check in the .txt file if that level before was done right(1) or wrong(0)
and return something like "before you made this level properly" or "before you made this level incorrectly" AND THEN let the user start with the level.
2- (second method called salvaRisultati) at the end of the level i wanna pass the result (correct/incorrect) to another method of this class that will save the value (1 or 0) associated to the user in the right position.
This is the class that i'm writing:
Java Code:
import java.io.BufferedReader; import java.io.FileNotFoundException; import java.io.FileReader; public class ResultUsers {
[Code] ....
I really need some hint and some code example because I'm stuck. How I can take exactly the line with the user name? How I can correctly split the line in an array and then read/modify the value for that level?
I know how to append text to a File using the true argument but I would like to be able to append to a certain line In the file.Basically I've made a simple html page with Image links to different sites. I'm trying to make an app that will take a new site as Input and append It to the html file before the </body> tags.
So basically, if a line in a text file contains a certain string, that specific line will be deleted. It should probably be similair to this method?
Java Code:
/** * Replace text. * @param replace * The text to replace. * @param replaceWith * The text to replace with. */ public static void replaceSelected(String replace, String replaceWith) { try { BufferedReader file = new BufferedReader(new FileReader("data/replacer.txt"));
I need to search a txt file for a specific keyword and then output all the lines that contain that keyword. Right now I I think I have my search done but I don't know how I would print the whole line.
TextIO.readFile("xxx.txt"); String search; String word; int count=0; TextIO.put("Please enter your search word: "); search = TextIO.getln(); while (!TextIO.eof()) { word = TextIO.getln(); count = count+1; if (search.equalsIgnoreCase(word)==true){ TextIO.put(count + "-"); TextIO.put(word);
Right now it doesnt even let me enter in any values for the search. Not sure what I've done wrong..
tab separated values, for different columns and these are the lines only I want method to read.Now suppose if any is there as below, or even enter
12-01-0113:26San Jose12.99DVD 12-12-3009:40Miami13.50Music 14-08-3010:20Arizona16.03Scientist 11-07-1009:10New York25.00ColdPlay 14-08-3010:20Arizona18.04MeetYou [new lines] 14-08-3010:20Arizona50.03Scientist 11-07-1009:30New York25.00ColdPlay //This line should not be read even this should not be read #$%^& 11-07-1009:20New York25.00ColdPlay
That particular line should be escaped. Till now I have done when the file format is proper, and it is as below:--
public static void main(String[] args) { BufferedReader br = null; String temp = null; List<String> arrayRead = new ArrayList<String>(); try{ br = new BufferedReader(new FileReader("D: estingSalesData.txt"));
I am trying to write a specific byte sequence to a specific memory location on a removable storage drive. Does Java allow me a way to do this? I know the dangers in accessing memory, but the memory location of the data that will be written will never change.
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.
// 2009 nobelPrizeWinners.put("2009 Physics", new PrizeWinner[] {new PrizeWinner("Charles K.", "Kao"), new PrizeWinner("Willard S.", "Boyle"), new PrizeWinner("George S.", "Smith")}); nobelPrizeWinners.put("2009 Chemistry", new PrizeWinner[] {new PrizeWinner("Venkatraman", "Ramakrishnan"),
[Code] .....
At the moment, my output is:
2008: Chemistry: Osamu Shimomura, Martin Chalfie, Roger Y. Tsien 2008: Economics: Paul Krugman 2008: Literature: Jean-Marie Gustave Le Clézio 2008: Medicine: Harald zur Hausen, Françoise Barré-Sinoussi, Luc Montagnier 2008: Peace: Martti Ahtisaari
[Code] .....
However, I need a blank line between the final entry of 2008 and the first entry of 2009.
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");
I am somewhat of a java newbie (learned it awhile back and just getting back to programming some again.) I have a text file of data much larger than this, but here are the first ten rows and first 10 columns.
I can read and write all the data back out to files. But I am not sure about a few things.
First would it be best to use BufferedReader and OutputStream such as:
public static void main(String[] args) throws IOException { BufferedReader bReader = new BufferedReader(new FileReader ("testdata.txt")); BufferedOutputStream bytesOut = new BufferedOutputStream(new FileOutputStream ("outfile.txt"));
Second, I was then going to initialize an array but I might have 30 or more columns of data, of which I might perform and output only 10 columns to my output.txt file so is this a good way?
Third, I only want to perform operations (such as average the data, convert units or multiply two columns together) on 10 of the 30 plus columns and print out results to output.txt file. For example, In testdata.txt file above, I want to skip first seven columns. I then want to take column 8 and multiply by 100 then divide by 3 and output result to output file. I want to do same for column 9. Column 10 I want to multiply by different number (by 3.5).
If I specify the directory in file type or path string type how can I get a list of files that are file type .yml in that folder, so I can loop through and do something with each single file.yml in that specified directory.
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..
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.
The basic gist is it's "A program that reads in a text file that uses a specific input format and uses it to produce a formatted report for output."
Specifically :"For this lab you will write a Java program that produces a simple formatted report. The program will prompt the user to enter a file name. This file must contain information in a specific format (detailed below). Each "block" of the file contains information for one player in a competition -- the name of the player followed by a number of different scores that that player achieved. The program should find each player's average score, median score and best and worst scores and display them in a line on the final summary report. The program should also determine which player has the highest average score and which player has the lowest average score."
I get the following errors when I try and compile it:
Enter an input file name: Project11.txt Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException... -1 at java.util.ArrayList.elementData(Unknown Source) at java.util.ArrayList.get(Unknown Source) at Project11.getMedian(Project11.java:68) at Project11.main(Project11.java:27)
I get that the error(s) reside in lines 68 and 27, among problem other areas, but I'm not exactly sure how I can fix them.
Here's my code:
import java.io.*; import java.util.*; public class Project11 { public static void main(String[] args) throws IOException{ Scanner in = new Scanner(System.in); System.out.print("Enter an input file name: "); String input = in.nextLine();
I am trying to have a program go on one of the stock trading websites and read the number a stock or currency is at and display or save it. I have it reading and displaying the binary code but I don't see how to have it find the numbers I would like to get.
On the site you would have to go on the page and click some tabs to trade and maybe the stock you would like, it doesn't really matter what one it returns as this is more just an idea. Although I would like to have it search out a selected stock eventually to take it to the net level. I think my biggest problem is I can't see how to access the stock numbers in the code. I looked for different click events but don't see how to have a program do this.
I do not intend to have it display all the code like it is now. I just did it like that to see what I was getting. I will just have a small toolbar with options and a display.
import java.io.BufferedInputStream; import java.io.IOException; import java.io.InputStream; import java.net.MalformedURLException; import java.net.URL; public class StockTracker { public static void main(String[] args) {
I am completing the exercises in Java How To Program 8th Edition by Harvey and Paul Deitel.There are two optional exercises GUI and Graphics Case Study Exercises on page 141 Chapter 4.
I have to use loops and control statements to draw lines thereby creating two designs.I am trying to create the design on Fig. 4.20. The lines do not line up correctly.The lines should fan out from all corners. Individually, they look exactly like it should.
Example of one corner.
int width = getWidth(); int height = getHeight(); // upper-left corner int startX = 0; int startY = 0; int endX = 0;
[Code] ....
For the other corners I have different starting and ending positions.To draw upper-left corner I have a starting position of 0,0 and ending position of 0,height.I then move ending position up one vertical step and right one horizontal step. I repeat this fifteen times.
To draw upper-right corner I have a starting position of width,0 and ending position of width,height. I then move ending position up one vertical step and left one horizontal step.
To draw bottom-left corner I have a starting position of 0,height and ending position of 0,0. I then move ending position down one vertical step and right one horizontal step.
To draw bottom-right corner I have a starting position of width, height and ending position of width,0. I then move ending position down one vertical step and left one horizontal step.
For the second design Fig. 4.21 all my lines line up correctly no matter the direction I resize it. Both designs frame size is 250,250. Both designs are divided into fifteen steps.
I’ve been working on this problem for a couple days already but I came to a point where I don’t really know what to do. Basically I’ve got two arrays filled with int values (0, 1, and 2), which I get from Class B through their respective getMethods.
1 stands for black and 2 stands for something else.
The program counts how many times the value 1 (if chosen color is black) occurs in both arrays and then compares the both counts. If it detects any difference the program does something else, otherwise it waits.
public class A { private static boolean finished; public A() { B objectClassB = new B(); int[] numbers = objectClassB.getNumbers(); int[] numbers2 = objectClassB.getNumbers2(); String color = objectClassB.getColor();
[Code] ....
Here the class B.
public class B { private int[] numbers = new int[] { 2, 2, 0, 2, 1, 0, 1, 2, 1, 1, 0, 2, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 2, 1 }; private int[] numbers2 = new int[] { 2, 2, 0, 2, 1, 0, 1, 2, 1, 1, 0, 2, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 2, 0 }; private String color = "black"; public B() { } public int[] getNumbers(){
[Code] .....
this would be the Output:
[2, 2, 0, 2, 1, 0, 1, 2, 1, 1, 0, 2, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 2, 1] [2, 2, 0, 2, 1, 0, 1, 2, 1, 1, 0, 2, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 2, 0] number of black tokens of first array: 8 number of black tokens of second array: 7 the number of black tokens has changed
The actual problem is that I will be getting one array at a time (meaning: the array int[] numbers from Class B updates itself and might change its values). I just declared and initialize both arrays for illustration purposes.
That would mean I need to hold the array’s values the first time I get them in a temporary variable until I get the values of the updated array. Then I could use them in the method –numberOfRelevantElements- and check if any changes have occurred.
What would be the best approach for doing this? I though of inserting the different counts that I get into a queue and then comparing these values one after the other. But I’m not really sure if that would work.
I just need to write a simple program/function that replaces certain letters from a string (i.e. censor( "college", "aeiou" ) returns "cllg"). I'm trying to get the code right first, and then write a function for it.I basically just thought that I would iterate over the first string, and once I had the first character, I would then iterate over the second string, to see if the character exists. I'm getting a "dead code" error on my second loop because I put the second "break."
public class ap { public static void main(String [] args){ String s = "Hello"; String s2 = "aeiou";
while (scan.hasNextInt()) { list.add(scan.nextInt()); }
It asks the user to input integers and passes them to an ArrayList of integers named list. Without any termination it works fine, but I am not sure about how to terminate the scanner at a specific value. I am trying to terminate the scanner once the user enters 0. Is there a method in the Scanner class that terminates at a specific value?
I've been trying while (scan.hasNextInt() && scan.nextInt() != 0 ) but it seems to only work on the second zero entered. For ex, if I enter 2 3 6 8 0 0 it stops on the second zero, not the first
