can't get the program read countrydata.txt file
can't get the program read countrydata.txt file
import java.util.ArrayList;
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
public class Largest_Country
{
public static ArrayList<Country> readCountry(String filename) throws FileNotFoundException
{
// Create an arraylist of the country class
ArrayList<Country> countries = new ArrayList<Country>();
// Create a scanner object to open the input file
Scanner scan = new Scanner(new File(filename));
// Initialize a string variable to read the file
String line = "";
while(scan.hasNextLine())
{
// Read the file line by line
line = scan.nextLine();
// Split the line at spaces, and assign the values to
// a string array
String[] details = line.split(" ");
// Create object of the class Country, and pass the values
// to the object
Country country_info = new Country(details[0], Long.parseLong(details[1]), Long.parseLong(details[2]));
// Add the object to the arraylist
countries.add(country_info);
}
// Return the arraylist
return countries;
}
// Define the countryWithLargestArea() method
public static Country countryWithLargestArea(ArrayList<Country> countries)
{
// Create an object of the class, and assign the
// first value from the arraylist
Country largest_area_country = countries.get(0);
for(int x = 0; x < countries.size(); x++)
{
// Check if the value of area at index x is greater than
// the value at largest_area_country
if(countries.get(x).getCountryArea() > largest_area_country.getCountryArea())
{
// Assign the values to largest_area_country
largest_area_country = countries.get(x);
}
}
// Return the country details
return largest_area_country;
}
// Define the countryWithLargestPopulation() method
public static Country countryWithLargestPopulation(ArrayList<Country> countries)
{
// Create an object of the class, and assign the
// first value from the arraylist
Country largest_population_country = countries.get(0);
for(int x = 0; x < countries.size(); x++)
{
// Check if the value of area at index x is greater than
// the value at largest_population_country
if(countries.get(x).getCountryPopulation() > largest_population_country.getCountryPopulation())
{
// Assign the values to largest_population_country
largest_population_country = countries.get(x);
}
}
// Return the country details
return largest_population_country;
}
// Define the countryWithLargestPopulationDensity() method
public static Country countryWithLargestPopulationDensity(ArrayList<Country> countries)
{
// Create an object of the class, and assign the
// first value from the arraylist
Country largest_population_density_country = countries.get(0);
for(int x = 0; x < countries.size(); x++)
{
// Check if the value of area at index x is greater than
// the value at largest_population_density_country
if(countries.get(x).getPopulationDensity() > largest_population_density_country.getPopulationDensity())
{
// Assign the values to largest_population_density_country
largest_population_density_country = countries.get(x);
}
}
// Return the country details
return largest_population_density_country;
}
// Define the main() method
public static void main(String[] args)
{
try
{
// Create an arraylist, and call the readCountry() method
ArrayList<Country> countries = readCountry("countrydata.txt");
// Call the countryWithLargestArea(), and display the
// country having largest area
System.out.println("The country with the largest area:\n" + countryWithLargestArea(countries).printCountry());
// Call the countryWithLargestArea(), and display the
// country having largest population
System.out.println("\nThe country with the largest population:\n" + countryWithLargestPopulation(countries).printCountry());
// Call the countryWithLargestPopulationDensity(), and display the
// country having largest population density
System.out.println("\nThe country with the largest population density:\n" + countryWithLargestPopulationDensity(countries).printCountry());
}
catch(FileNotFoundException e)
{
// Display file not found exception
System.out.println("File not found!!");
}
}
}
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