Question

In Java:

Write a program that will count the number of characters, words, and lines in a file. Words are separated by whitespace characters. The file name should be passed as a command-line argument, as shown below.

c:\exercise>java Exercise12_13 Loan.java
File loan.java has
1919 characters
210 words
71 lines

c:\exercise>

Class Name: Exercise12_13

Answer 1

Please find the code for the following:

Code:

import java.io.*;
import java.util.*;

class Exercise_12_13 {
   /** Main method */
   public static void main(String[] args) throws Exception
{
      
//Creating an object of Class File by calling the constructor
//With a parameter named args[0] which is th file name.
       File file = new File(args[0]);
      
       int characters = 0, words = 0, lines = 0;

//Here, we are using Java Scanner class for opening and reading a file.

           // Create an object of Scanner class by calling the constructor with the file parameter which we created
           Scanner s1 = new Scanner(file);
Scanner s2 = new Scanner(file);

//Iterating over all the lines and calculating the number of lines as well as the characters here.
           while (s1.hasNext())
{
               lines++; //Increment the line count
               String line = s1.nextLine();
               characters += line.length(); //Increment the characters count
           }
          
//Iterating over all the lines and then calculating the number of wods present in entire file.
           while (s2.hasNext())
{
               String line = s2.next();
               words++;
           }

       //Printing the result as provided in the sample output
       System.out.println("File " + args[0] + " has");
       System.out.println(characters + " characters");
       System.out.println(words + " words");
       System.out.println(lines + " lines");
   }
}

Please check the compiled program and its output for your reference:

Output:
Since the output of the file Loan.java varies from your file Loan.java. The result may vary but still is appropriate to the file which is being taken as a command line parameter for this class. please notice that.[I also outputted the Loan.java file for your understanding]

(I believe that I made the code simple and understandable. If you still have any query, Feel free to drop me a comment)

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