Question

Java

How can i modify my program to allow the user to run the program as many times as possible until a sentinel value of zero (0) has been entered for the year . Program works just fine, just need help changing that.

Program outline: Write a program that reads this file only once and creates a HashMap in which the keys are the years and each key’s associated value is the name of the team that won that year. The program should also create a HashMap in which the keys are the names of the teams and each key’s associated value is the number of times the team has won the World Series.

import java.io.File;

import java.io.FileNotFoundException;

import java.util.HashMap;

import java.util.LinkedHashMap;

import java.util.Scanner;

public class WorldSeries {

private HashMap wininingYearTeamsMap;

private HashMap movieWininingCountMap;

public WorldSeries() {

wininingYearTeamsMap = new LinkedHashMap();

movieWininingCountMap = new LinkedHashMap();

}

public static void main(String[] args) {

WorldSeries worldSeries = new WorldSeries();

worldSeries.readInputFile("Program3.txt");

worldSeries.readUserInput();

}

private void readUserInput () {

Scanner userInput = new Scanner(System.in);

int year;

do {

System.out.print("Enter a year between 1903 and 2019, \"0\" to stop: ");

year = userInput.nextInt();

String teamName = getTeamNameBasedOnYear(year);

if (teamName != null && !teamName.equalsIgnoreCase("")) {

int winningCount = getWinningCount(teamName);

System.out.println(teamName+ " won the World Series in: "+year);

System.out.println("Total number of times "+teamName+" won the World Series is: "+winningCount);

} else {

System.out.println("No team won the World Series in: "+year);

}

} while (year < 1903 || year > 2019);

userInput.close();

}

private void readInputFile(String inputFileName) {

Scanner sacnnerReader = null;

try {

File file = new File(inputFileName);

if (file.exists()) {

int year = 1903;

sacnnerReader = new Scanner(file);

while (sacnnerReader.hasNextLine()) {

String teamName = sacnnerReader.nextLine();

if (year == 1904 || year == 1994 ) {

year++;

}

wininingYearTeamsMap.put(year, teamName);

if (movieWininingCountMap.get(teamName) != null) {

movieWininingCountMap.put(teamName, movieWininingCountMap.get(teamName)+1);

} else {

movieWininingCountMap.put(teamName,1);

}

year++;

}

} else {

System.out.println("Input File not found");

}

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (Exception e) {

e.printStackTrace();

} finally {

if (sacnnerReader != null) {

try {

sacnnerReader.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

}

private String getTeamNameBasedOnYear(int year) {

if (wininingYearTeamsMap.get(year) != null) {

return wininingYearTeamsMap.get(year);

} else {

return null;

}

}

private int getWinningCount(String teamName) {

if (movieWininingCountMap.get(teamName) != null) {

return movieWininingCountMap.get(teamName);

} else {

return 0;

}

txt file

Boston Americans
New York Giants
Chicago White Sox
Chicago Cubs
Chicago Cubs
Pittsburgh Pirates
Philadelphia Athletics
Philadelphia Athletics
Boston Red Sox
Philadelphia Athletics
Boston Braves
Boston Red Sox
Boston Red Sox
Chicago White Sox
Boston Red Sox
Cincinnati Reds
Cleveland Indians
New York Giants
New York Giants
New York Yankees
Washington Senators
Pittsburgh Pirates
St. Louis Cardinals
New York Yankees
New York Yankees
Philadelphia Athletics
Philadelphia Athletics
St. Louis Cardinals
New York Yankees
New York Giants
St. Louis Cardinals
Detroit Tigers
New York Yankees
New York Yankees
New York Yankees
New York Yankees
Cincinnati Reds
New York Yankees
St. Louis Cardinals
New York Yankees
St. Louis Cardinals
Detroit Tigers
St. Louis Cardinals
New York Yankees
Cleveland Indians
New York Yankees
New York Yankees
New York Yankees
New York Yankees
New York Yankees
New York Giants
Brooklyn Dodgers
New York Yankees
Milwaukee Braves
New York Yankees
Los Angeles Dodgers
Pittsburgh Pirates
New York Yankees
New York Yankees
Los Angeles Dodgers
St. Louis Cardinals
Los Angeles Dodgers
Baltimore Orioles
St. Louis Cardinals
Detroit Tigers
New York Mets
Baltimore Orioles
Pittsburgh Pirates
Oakland Athletics
Oakland Athletics
Oakland Athletics
Cincinnati Reds
Cincinnati Reds
New York Yankees
New York Yankees
Pittsburgh Pirates
Philadelphia Phillies
Los Angeles Dodgers
St. Louis Cardinals
Baltimore Orioles
Detroit Tigers
Kansas City Royals
New York Mets
Minnesota Twins
Los Angeles Dodgers
Oakland Athletics
Cincinnati Reds
Minnesota Twins
Toronto Blue Jays
Toronto Blue Jays
Atlanta Braves
New York Yankees
Florida Marlins
New York Yankees
New York Yankees
New York Yankees
Arizona Diamondbacks
Anaheim Angels
Florida Marlins
Boston Red Sox
Chicago White Sox
St. Louis Cardinals
Boston Red Sox
Philadelphia Phillies
New York Yankees
San Francisco Giants
St. Louis Cardinals
San Francisco Giants
Boston Red Sox
San Francisco Giants
Kansas City Royals
Chicago Cubs
Houston Astros
Boston Red Sox
Washington Nationals

Answer 1

thanks for the question, here is the updated class that will keep on looping until user enters 0

Hope this helps

let me know for any help with any other questions,

================================================================

import java.io.File;
import java.io.FileNotFoundException;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Scanner;
public class WorldSeries {
    private static HashMap<Integer, String> wininingYearTeamsMap;
    private static HashMap<String, Integer> movieWininingCountMap;

    public WorldSeries() {
        wininingYearTeamsMap = new LinkedHashMap();
        movieWininingCountMap = new LinkedHashMap();
    }

  public static void main(String[] args) {
        WorldSeries worldSeries = new WorldSeries();
        worldSeries.readInputFile("D:\\series.txt"); // i updated the file name when i was testing
        worldSeries.readUserInput();
    }

    private void readUserInput() {
        Scanner userInput = new Scanner(System.in);
        int year;
        do {
            System.out.print("Enter a year between 1903 and 2019, \"0\" to stop: ");
            year = userInput.nextInt();
            if(year!=0){
                String teamName = getTeamNameBasedOnYear(year);
                if (teamName != null && !teamName.equalsIgnoreCase("")) {
                    int winningCount = getWinningCount(teamName);
                    System.out.println(teamName + " won the World Series in: " + year);
                    System.out.println("Total number of times " + teamName + " won the World Series is: " + winningCount);
                } else {
                    System.out.println("No team won the World Series in: " + year);
                }
            }

        } while (year!=0); // loop until year is not zero
        userInput.close();

        System.out.println("Bye!");
    }

    private void readInputFile(String inputFileName) {
        Scanner sacnnerReader = null;
        try {
            File file = new File(inputFileName);
            if (file.exists()) {
                int year = 1903;
                sacnnerReader = new Scanner(file);
                while (sacnnerReader.hasNextLine()) {
                    String teamName = sacnnerReader.nextLine();
                    if (year == 1904 || year == 1994) {
                        year++;
                    }
                    wininingYearTeamsMap.put(year, teamName);
                    if (movieWininingCountMap.get(teamName) != null) {
                        movieWininingCountMap.put(teamName, movieWininingCountMap.get(teamName) + 1);
                    } else {
                        movieWininingCountMap.put(teamName, 1);
                    }
                    year++;
                }
            } else {
                System.out.println("Input File not found");
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (sacnnerReader != null) {
                try {
                    sacnnerReader.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }

    private String getTeamNameBasedOnYear(int year) {
        if (wininingYearTeamsMap.get(year) != null) {
            return wininingYearTeamsMap.get(year);
        } else {
            return null;
        }
    }

    private int getWinningCount(String teamName) {
        if (movieWininingCountMap.get(teamName) != null) {
            return movieWininingCountMap.get(teamName);
        } else {
            return 0;
        }
    }
}

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