Question

Write a java program that will read a file called stateinfo.txt and will store the information of the file into a map. The stateinfo.txt file contains the names of some states and their capitals. The format of stateinfo.txt file is as follows.

State                Capital

---------                         -----------

NSW               Sydney

VIC                 Melbourne

WA                 Perth

TAS                 Tasmania

QLD                Brisbane

SA                   Adelaide

The program then prompts the user to enter the name of a state. Upon receiving the user input, the program should display the name of the capital for that particular state. Assume that the name of the state that a user may enter already exists in the stateinfo.txt file.

Answer 1

SourceCode:

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

public class SearchCapitals {
    public static void main(String args[]){
        //Declaring the variables
        String stateName;
        //Creating the scanner object for getting input from user
        Scanner scanner = new Scanner(System.in);
        //Creating the Map objects
        Map<String,String> map=new HashMap<String,String>();
        //Creating the BufferedReader objects for reading the text file
        BufferedReader reader;
        //Reading the the text file
        try {
            reader = new BufferedReader(new FileReader("stateinfo.txt"));
            String line = reader.readLine();
            //Reading the file line by line until the end of the file is reached
            while (line != null) {
                //Spliting the line in words
                String data[] = line.split(" ");
                map.put(data[0],data[1]);
                //Puting the data to the map
                //read next line
                line = reader.readLine();
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("Please enter name of the state: ");
        stateName = scanner.nextLine();
        System.out.println("Capital of " + stateName + " is " + map.get(stateName));
    }
}

OUTPUT: