Question

Write a program to reverse the lines of a file and to reverse the words plus the letter's of each word within each line using ArrayList.

A file name mobydick.txt

Example:

Original file contains the following

MOBY DICK; OR THE WHALE

by Herman Melville

CHAPTER 1

Loomings.

Out put should be

.sgnimooL

1 RETPAHC

ellivleM namreH yb

ELAHW EHT RO ;KCID YBOM

its for java eclipse

Answer 1

Solution

Steps :

1.Create an empty arraylist to typee string

2.Take Input file from your system (Donot forgot to add the full address of the file in the address)

3.Iterate each line of the file and add it to the arraylist.

4.Now for each string in arraylist iterate it from back to top (length-1 to 0)

5.For every string we found after reversal our final step is to reverse the strinn using the reverse function in StringBuffer Java Class.

6.At last print to next line after each index of arraylist.

Java Prograam :

/* importing the util package*/
import java.io.*;
import java.util.*;

public class ReverseFile
{

/* main function */
public static void main (String[]args) throws FileNotFoundException
{

/* creating the arraylist for storing the words in the string */
ArrayList < String > reverseFileWords = new ArrayList <> ();

/*taking the input from the file
* you have to replace the txt file address with your own full address of the file in your system*/
//TODO
Scanner input =
new Scanner (new File ("-----replace with our own txt file URL------"));

/* iterating the file for every line */
while (input.hasNextLine ())
{
   /* adding the seperate line in the linked list */
   reverseFileWords.add (input.nextLine ());
}
/* this loop seperate the each word from the line
* we are seperating on the basics of the space*/
for (int i = (reverseFileWords.size () - 1); i >= 0; i--)
{
   String ar[] = reverseFileWords.get (i).split (" ");

   for (int j = (ar.length - 1); j >= 0; j--)
   {
   /* reversing each word by using the string buffer */
   StringBuffer buffer = new StringBuffer (ar[j]);
   System.out.print (buffer.reverse () + " ");
   }
   /* printing the nexr line */
   System.out.println (" ");
   ar = null;
}

}

}

Code screenshot.

Output ScreenShot :