Question

JAVA:

File USCapitals.txt is here:

Alabama, Montgomery

Alaska, Juneau

Arizona, Phoenix

Arkansas, Little Rock

California, Sacramento

Colorado, Denver

Connecticut, Hartford

Delaware, Dover

Florida, Tallahassee

Georgia, Atlanta

Hawaii, Honolulu

Idaho, Boise

Illinois, Springfield

Indiana, Indianapolis

Iowa, Des Moines

Kansas, Topeka

Kentucky, Frankfort

Louisiana, Baton Rouge

Maine, Augusta

Maryland, Annapolis

Massachusettes, Boston

Michigan, Lansing

Minnesota, Saint Paul

Mississippi, Jackson

Missouri, Jefferson City

Montana, Helena

Nebraska, Lincoln

Nevada, Carson City

New Hampshire, Concord

New Jersey, Trenton

New York, Albany

New Mexico, Santa Fe

North Carolina, Raleigh

North Dakota, Bismark

Ohio, Columbus

Oklahoma, Oklahoma City

Oregon, Salem

Pennslyvania, Harrisburg

Rhode Island, Providence

South Carolina, Columbia

South Dakota, Pierre

Tennessee, Nashville

Texas, Austin

Utah, Salt Lake City

Vermont, Montpelier

Virginia, Richmond

Washington, Olympia

West Virginia, Charleston

Wisconsin, Madison

Wyoming, Cheyenne

The file contains the names of all states in the United States and the capital of the state in question.

The format of the file is:

State name, capital name

So state and capital name are comma-separated. Both state and capital name can be several words, such as New York and Little Rock.

One state, capital per line.

Create a program that reads the file and creates a Map with key and value.

Then offer the user to enter a state name and print the capital of the state, or error message if the state does not exist.

Answer 1

import java.io.BufferedReader;
import java.io.FileReader;
import java.util.HashMap;
import java.util.Scanner;

public class StateCapitals {
   public static void main(String[] args) throws Exception {
       BufferedReader br = new BufferedReader(new FileReader("USCapitals.txt"));
       HashMap<String, String> map = new HashMap<String, String>();
       String line = br.readLine();
       //reading and putting all states and capitals into map
       while (line != null) {
           String arr[] = line.split(",");
           map.put(arr[0], arr[1]);
           line = br.readLine();
       }
       //reading state name from user
       Scanner sc = new Scanner(System.in);
       System.out.println("Enter state name: ");
       String s = sc.next();
       //printing capital for given state
       System.out.println(s + "'s capital is " + map.get(s));
       ;
   }
}

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