CODEWITHSUNDEEP
java
Nitro
Nitro

Reputation: 87

How to remove commas from a line and write it to an output file

This is my assignment - Write a program that reads a file and removes all comma’s from it and writes it back out to a second file. It should print to the console window, at the end, the number of comma’s removed. The program needs to: Prompt the user for the name of the file to read. Reads file Write the non-comma characters to output.txt, including all spaces. When done reading the input file, write the total number of comma’s removed to the console window.

For example, if the input file contains 3+,2 = 5m, 7%,6 =1 hello Then the output.txt file should contain:

3+2=5m 7%6=1 hello And the console window should print “Removed 3 commas”.

Right now I'm having trouble actually removing commas from my input file, I think I would write the line under my last if statment.

Tried figuring out how to remove commas from the input file

 package pkg4.pkg4.assignment;
import java.util.Scanner;
import java.io.*;

/**
 *
 * @author bambo
 */
public class Assignment {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
       Scanner keyboard = new Scanner(System.in); 
       System.out.println("What is the name of the inputfile?");
       String inputfile = keyboard.nextLine();
       File f = new File(inputfile);
       Scanner inputFile = new Scanner(f);

         System.out.println("Please enter the output file");
         String outputfile = keyboard.nextLine();


         FileWriter fw = new FileWriter(outputfile);
         PrintWriter pw = new PrintWriter(fw);


       int lineNumber=0;


       while(inputFile.hasNext());
        lineNumber++;
             int commacount = 0;

              String line = inputFile.nextLine();
             if (line.length () != 0)
                 commacount++;
              for(int i=0; i< line.length(); i++)
             {
                 if(line.charAt(i) == ',');
                 {
                     commacount++;
                 }

         pw.println("removed " + commacount + "commas");

    }

}
}

Upvotes: 1

Views: 1146

Answers (2)

Aniruddhsinh
Aniruddhsinh

Reputation: 182

According to your requirement for program i am suggesting you to use java 8 classes.for simplicity.

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Scanner;

public class Assignment {

    public static void main(String[] args) throws IOException {
        String content = "";
        Scanner keyboard = new Scanner(System.in);
        System.out.println("What is the name of the input file?");
        String inputfile = keyboard.nextLine();
        content = new String(Files.readAllBytes(Paths.get(inputfile)));
        long total_numbers_of_char = content.chars().filter(num -> num == ',').count();
        System.out.println("Please enter the output file");
        content = content.replaceAll(",", "");
        String outputfile = keyboard.nextLine();
        Files.write(Paths.get(outputfile), content.getBytes());
        System.out.println("removed " + total_numbers_of_char + " commas");
        keyboard.close();
    }

}

Upvotes: 1

nullPointer
nullPointer

Reputation: 4574

To print on console you should be using :

System.out.println("removed " + commacount + "commas");

To write the line in the output file without the commas :

pw.println(line.replaceAll(",",""));

Upvotes: 0

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