Must be done in Java** please help I am struggling on what to do. the task is cr

ID: 3909230 • Letter: M

Question

Must be done in Java** please help I am struggling on what to do. the task is create a program that does the following(pls make the code as simply as posssible as i am just learning java):

read the following .txt files

continenet.txt

Country,Continent

China,Asia

United States of America,North America

Brazil,South America

Japan,Asia

Canada,North America

Indonesia,Asia

Nigeria,Africa

Mexico,North America

Egypt,Africa

France,Europe

Italy,Europe

South Africa,Africa

South Korea,Asia

Colombia,South America

data.txt

Country|Population|Area

China|1,339,190,000|9,596,960.00

United States of America|309,975,000|9,629,091.00

Brazil|193,364,000|8,511,965.00

Japan|127,380,000|377,835.00

Canada|34,207,000|9,976,140.00

Indonesia|260,581,100|1,809,590.97

Nigeria|186,987,563|912,134.45

Mexico|128,632,004|1,969,230.76

Egypt|93,383,574|1,000,000.00

France|64,668,129|541,656.76

Italy|59,801,004|300,000.00

South Africa|54,978,907|1,222,222.22

South Korea|50,503,933|98,076.92

Colombia|48,654,392|1,090,909.09

saveCountryCatalogue: given a parameter filename (a string), write the country data of the catalogue as specified below to file filename. Each entry should be formatted as below, one country per line. Return the number of lines that were written in the file filename. Format: Name|Continent|Population|PopulationDensity Ex: China|Asia|1200000000|14.56

findCountryWithLargestPop :

find the country with the largest population, return the name of this country. This method takes no additional parameters

findCountryWithSmallestArea:

find the country with the smallest area, return the name of this country. This method takes no additional parameters.

setPopulationOfACountry :

Given two parameters countryName (a string) and countryPopulation (an integer), find the country named countryName in the countryCatalogue (if it exists), and set the population of that country to the value countryPopulation . o Return true if the population is updated, and return false otherwise.

Explanation / Answer

Given below is the code for the question.In order to see output fiel, you need to refresh project after code finishes running.
To indent code in eclipse , select code by pressing ctrl+a and then indent using ctrl+i
Please do rate the answer if it was helpful. Thank you
NOTE: Please make sure you place your input file in the correct folder. If using eclipse, the file should be in the project directly and NOT INSIDE src folder.

Country.java
-----

public class Country {
private String name;
private String continent;
private long population;
private double area;

public Country(String name, String continent){
this.name = name;
this.continent = continent;
}

public long getPopulation() {
return population;
}

public void setPopulation(long population) {
this.population = population;
}

public double getArea() {
return area;
}

public void setArea(double area) {
this.area = area;
}

public String getName() {
return name;
}

public String getContinent() {
return continent;
}

public String toString(){
return String.format("Country: %s, Continent: %s, Population: %d, Area: %.2f", name, continent, population, area);
}
}

ProcessCountry.java
--------
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Scanner;

public class ProcessCountry {
static ArrayList<Country> countryCatalogue;
public static int saveCountryCatalogue(String fileName) throws FileNotFoundException{
PrintWriter pw = new PrintWriter(fileName);
DecimalFormat formatter = new DecimalFormat("###,###,###.##");
for(Country c: countryCatalogue)
pw.printf("%s|%s|%s|%.2f ", c.getName() , c.getContinent(), formatter.format(c.getPopulation()), c.getPopulation()/c.getArea() );
pw.close();
System.out.println("Country catalogue saved to " + fileName +". Please refresh folder to see output file");
return countryCatalogue.size();
}

public static String findCountryWithLargestPop(){
int maxIdx = 0;
for(int i = 1; i < countryCatalogue.size(); i++)
{
if(countryCatalogue.get(i).getPopulation() > countryCatalogue.get(maxIdx).getPopulation())
maxIdx = i;
}

return countryCatalogue.get(maxIdx).getName();
}

public static String findCountryWithSmallestArea(){
int minIdx = 0;
for(int i = 1; i < countryCatalogue.size(); i++)
{
if(countryCatalogue.get(i).getArea() <countryCatalogue.get(minIdx).getArea())
minIdx = i;
}

return countryCatalogue.get(minIdx).getName();

}

public static void setPopulationOfACountry(String countryName, long countryPopulation){
for(int i = 0; i < countryCatalogue.size(); i++)
{
if(countryCatalogue.get(i).getName().equalsIgnoreCase(countryName)){
countryCatalogue.get(i).setPopulation(countryPopulation);
return;
}
}
}
public static void setAreaOfACountry(String countryName, double countryArea){
for(int i = 0; i < countryCatalogue.size(); i++)
{
if(countryCatalogue.get(i).getName().equalsIgnoreCase(countryName)){
countryCatalogue.get(i).setArea(countryArea);
return;
}
}
}

public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
String continentFilename, popAreaFilename;

System.out.print("Enter filename containing country/continent: ");
continentFilename = keyboard.next();

System.out.print("Enter filename containing population/area: ");
popAreaFilename = keyboard.next();

//process continent data
Scanner infile = null;
try {
infile = new Scanner(new File(continentFilename));
} catch (FileNotFoundException e) {
System.out.println(e.getMessage());
System.exit(1);
}

infile.nextLine(); //skip the column names line

countryCatalogue = new ArrayList<Country>();
while(infile.hasNextLine())
{
String line = infile.nextLine();
String[] values = line.split(",");
countryCatalogue.add(new Country(values[0], values[1]));
}

infile.close();

//process population area
try {
infile = new Scanner(new File(popAreaFilename));
} catch (FileNotFoundException e) {
System.out.println(e.getMessage());
System.exit(1);
}
infile.nextLine();
while(infile.hasNextLine())
{
String line = infile.nextLine();
String[] values = line.split("\|");
setPopulationOfACountry(values[0], Long.parseLong(values[1].replaceAll(",", "").trim()));
setAreaOfACountry(values[0], Double.parseDouble(values[2].replaceAll(",", "").trim()));
}
infile.close();

System.out.print("Enter output filename to save data: ");
String outFilename = keyboard.next();

System.out.println("Country with largest population: " + findCountryWithLargestPop());
System.out.println("Country with smallest area: " + findCountryWithSmallestArea());
try {
saveCountryCatalogue(outFilename);
} catch (FileNotFoundException e) {
System.out.println(e.getMessage());
}

}

output
=====
Enter filename containing country/continent: continent.txt
Enter filename containing population/area: data.txt
Enter output filename to save data: output.txt
Country with largest population: China
Country with smallest area: South Korea
Country catalogue saved to output.txt. Please refresh folder to see output file

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