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Wednesday, 14 December 2016

Chapter 12 Exercise 31, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

12.31 (Baby name popularity ranking)
The popularity ranking of baby names from years 2001 to 2010 is downloaded
from www.ssa.gov/oact/babynames and stored in files named babynameranking2001.txt,
babynameranking2002.txt, . . . , babynameranking2010.txt. Each file contains one thousand
lines. Each line contains a ranking, a boy’s name, number for the boy’s name, a girl’s name,
and number for the girl’s name. For example, the first two lines in the file
babynameranking2010.txt are as follows:

So, the boy’s name Jacob and girl’s name Isabella are ranked #1 and the boy’s name
Ethan and girl’s name Sophia are ranked #2. 21,875 boys are named Jacob and 22,731
girls are named Isabella. Write a program that prompts the user to enter the year, gender,
and followed by a name, and displays the ranking of the name for the year.


import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class Exercise_31 {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        System.out.print("Enter year: ");
        String year = input.next();

        System.out.print("Enter gender: ");
        String gender = input.next();

        System.out.print("Enter name: ");
        String name = input.next();
        input.close();

        File file = new File("babynamesranking" + year + ".txt");
        if (!file.exists()) {
            System.out.println("No record for " + year);
            System.exit(1);
        }

        int rank = 0;
        try {
            Scanner read = new Scanner(file);
            while (read.hasNext()) {

                String s = read.nextLine();
                String[] temp = s.split(" ");

                if (gender.equalsIgnoreCase("M") && temp[1].contains(name))
                    rank = new Integer(temp[0]);
                else if (temp[3].contains(name))
                    rank = new Integer(temp[0]);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        if (rank == 0) {
            System.out.println("The name "+name+" is not ranked in year " + year);
        } else {

            System.out.println(name+" is ranked #"+rank+" in year "+ year);
        }


    }
}

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