Write a program that takes two command line arguments which are file names. The

Question

Write a program that takes two command line arguments which are file names. The program should read the first file line-by-line or character-by-character and write each line into the second file substituting numbers for letters according to the following substitution list.

a or A = 4

e or E = 3

i or I = 1

o or O = 0

t or T = 7

The program should include a "usage" method that displays the correct command line syntax if two file names are not provided. Example: If my input file says Hello, World! This is Leslie :) then my output file will contain H3ll0 W0rld! 7h1s 1s L3sl13 :)

Explanation / Answer

Hi,
Please see the classes below.
Please comment for any queries.

Thanks.

Formatter.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class Formatter {

   public static void main(String [] args){
       //Getting command line args
       if(args.length ==2){
           String content = readFromFile(args[0]); // Reading from input File
           writeToFile(args[1],content);
      
       }
       else{
           System.out.println("Please pass two file names as commd line args:file1_name[space]file2_Name");
       }
   }
   /**
   * Reading from input File and getting the formatted String
   * @param inFile
   * @return
   */
   public static String readFromFile(String inFile){
       String content = "";
       BufferedReader br = null;
       FileReader fr = null;
       try {

           fr = new FileReader(inFile);
           br = new BufferedReader(fr);

           String sCurrentLine;

           while ((sCurrentLine = br.readLine()) != null) {
               sCurrentLine = sCurrentLine.replace("a", "4");
               sCurrentLine=sCurrentLine.replace("A", "4");
               sCurrentLine=sCurrentLine.replace("e", "3");
               sCurrentLine=sCurrentLine.replace("E", "3");
               sCurrentLine=sCurrentLine.replace("i", "1");
               sCurrentLine=sCurrentLine.replace("I", "1");
               sCurrentLine=sCurrentLine.replace("o", "0");
               sCurrentLine=sCurrentLine.replace("O", "0");
               sCurrentLine=sCurrentLine.replace("t", "7");
               sCurrentLine=sCurrentLine.replace("T", "7");
               content = content +sCurrentLine;
           }

       } catch (IOException e) {

           e.printStackTrace();

       }
      
       return content;
   }
   /**
   * Writing to output File
   * @param outFile
   * @param content
   */
   public static void writeToFile(String outFile, String content){
       BufferedWriter bw = null;
       FileWriter fw = null;

   try {

       fw = new FileWriter(outFile);
       bw = new BufferedWriter(fw);
       bw.write(content);
       bw.flush();

       System.out.println("Done");

   } catch (IOException e) {

       e.printStackTrace();

   }
}
}

Command line args:

input_file.txt output_file.txt

input_file.txt :
Hello, World! This is Leslie :)

output_file.txt :
H3ll0, W0rld! 7h1s 1s L3sl13 :)

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