Question

Java Exceptions

Suppose a library is processing an input file containing the titles of books in order to remove duplicates. Write a program that reads all of the titles from an input file called bookTitles.inp and writes them to an output file called uniqueTitles.out. When complete, the output file should contain all unique titles found in the input file.

Create the input file using Notepad or another text editor, with one title per line. Make sure you have a number of duplicates, including some with three or more copies.

Answer 1

Implemented code as per the requirement. Please comment if you face any difficulty or if you need any modification.

Code:

=====

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

public class SodaCoke {

static File file1,file2;

static List lis;

public static void main(String[] args) throws IOException {

file1 = new File("bookTitles.inp");

file2 = new File("uniqueTitles.out");

Scanner sc = new Scanner(file1);

Scanner sc1 = new Scanner(file1);

FileWriter fw = new FileWriter(file2);

lis = new ArrayList<String>();

String title=null,title1 = null;

int count = 0;

while(sc1.hasNext()){

title1 = sc1.nextLine();

if(!checkIfCompleted(title1)){

sc = new Scanner(file1);

while(sc.hasNext()){

title = sc.nextLine();

if(title1.equalsIgnoreCase(title)){

count++;

}

}

fw.write(title1 + "\t" + count+"\n");

lis.add(title1);

}

count=0;

}

fw.close();

}

private static boolean checkIfCompleted(String title) {

if(lis.contains(title)){

return true;

}

return false;

}

}

Ouput screen:

===========

2 berg 1 3 chris 2 4 kevin 2 maria 2 karr1 mark 7