Geraldine's Landscaping Service and Gerard's Lawn Maintenance are merging their businesses and want to merge their customer files. Each file contains a customer number, last name, address, and property area in square feet, and each file is in customer number order. Design the logic for a program that merges the two files into one file containing all customers. Assume there are no identical customer numbers.

Check the explanation

Explanation:

Steps to follow:-

Read file1 or file2

Get number from line of file1

Check numberlist contains this number

if number is not in numberlist then add number to numberlist

Write line of file1 to outputFile

Read file2

Get number from line of file2

Check numberlist contains this number

if number is not in numberlist then add number ot numberlist

Write line of file2 to outputFile

Repeat the above process untill file line is not null

Complete Java code:-

import java. io.*;

import java. util.*;

public class Solution {

public static void main (String[] args)

{

mergerFiles ();

}

public static void mergerFiles ()

{

try {

FileReader fileReader1 = new FileReader ("res/file1");

BufferedReader bufferedReader1 = new BufferedReader (fileReader1);

FileReader fileReader2 = new FileReader ("res/file2");

BufferedReader bufferedReader2 = new BufferedReader (fileReader2);

FileWriter fileWriter = new FileWriter ("res/outputfile");

BufferedWriter bufferedWriter = new BufferedWriter (fileWriter);

String file1Line=null;

String file2Line=null;

Set set=new HashSet ();

while (((file1Line = bufferedReader1. readLine ()) ! = null) || (file2Line = bufferedReader2. readLine ()) ! = null) {

String number1=file1Line. split (",") [0]. split (":") [1];

if (set. add (number1))

{

bufferedWriter. write (file1Line+"/n");

}

if ((file2Line = bufferedReader2. readLine ()) ! = null) {

String number2 = file2Line. split (",") [0]. split (":") [1];

if (set. add (number2)) {

bufferedWriter. write (file2Line+"/n");

}

}

}

bufferedWriter. close ();

} catch (FileNotFoundException e) {

e. printStackTrace ();

} catch (IOException e) {

e. printStackTrace ();

}

}

}

File1 content:-

number:1234567890, lastname: Kumar, address: delhi, property:2000 sqft

number:2234567890, lastname: Chaudhari, address: Pune, property:4000 sqft

number:3234567890, lastname: Singh, address: Mumbai, property:2500 sqft

number:4234567890, lastname: Varma, address: Kolkata, property:5000 sqft

number:5234567890, lastname: Sinha, address: Patna, property:6000 sqft

File2 content:-

number:4234567890, lastname: Ram, address: bangalore, property:25000 sqft

number:6234567890, lastname: Rajput, address: Ranchi, property:40400 sqft

number:3234567890, lastname: Sinha, address: Gurgaon, property:25300 sqft

number:4234567890, lastname: Kaur, address: Chennai, property:50200 sqft

number:8234567890, lastname: Mehta, address: Pondicherry, property:26000 sqft

Output file content:-

number:1234567890, lastname: Kumar, address: delhi, property:2000 sqft

number:4234567890, lastname: Ram, address: bangalore, property:25000 sqft

number:2234567890, lastname: Chaudhari, address: Pune, property:4000 sqft

number:6234567890, lastname: Rajput, address: Ranchi, property:40400 sqft

number:3234567890, lastname: Singh, address: Mumbai, property:2500 sqft

number:5234567890, lastname: Sinha, address: Patna, property:6000 sqft

number:8234567890, lastname: Mehta, address: Pondicherry, property:26000 sqft