Question

I am almost done with this code, but for some reason I am still getting an error message:

Some of the instructions were:

Using a loop, prompt for a currency to find.

Inside the loop that manages the input, call the lookUpCurrency() method can pass the inputted currency code value.

The lookUpCurrency() method needs to loop through the list of currencies and compare the passed currency code with the code in the array. If found, return true - otherwise return false

Look at the showCurrencies() method for a example of how to loop for each element.

In the findMyCurrency() method

   If found - Display the currency code and index where it was found - i.e. "FJD found at index 0".

   If not found - Display "Currency Code not found".

  
b. Prompt with "Retry Y/N ?" to try again. If I select N, then exit the loop. Allow any other char to restart the loop and prompt for a currency to find.

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

import java.util.Currency;
import java.util.Iterator;
import java.util.Set;
import java.util.Scanner;

public class CheckCurrencyCode {

  
// Sets the MAX_CURRENCIES value from the Currency Object
static int MAX_CURRENCIES = Currency.getAvailableCurrencies().size();
static String[] CURRENCY_CODES = new String[MAX_CURRENCIES];
  
  
/**
* This method will load the currency_Codes array with 3 char codes.
* It does not need to change
*/
  
private static void loadCurrencyCodes() {
Set<Currency> currencies = Currency.getAvailableCurrencies();
Iterator<Currency> i = currencies.iterator();
int idx = 0;
while(i.hasNext()) {
CURRENCY_CODES[idx++] = i.next().getCurrencyCode();
}
}
  
/**
* Raw display of the Currency_codes;
* Could also use System.out.println(Arrays.toString(CURRENCY_CODES));
* It does not need to change
*/
private static void showCurrencies() {
       System.out.println("The valid currency codes are:");
for (int idx = 0; idx < MAX_CURRENCIES;++idx) {
System.out.print(CURRENCY_CODES[idx]+",");
}
  
System.out.println();
//System.out.println(Arrays.toString(CURRENCY_CODES));
}
  
  
/**
* Look up the given currency here and set the return value
* to true if found or false if not found
*
* Hint: Use a FOR loop to traverse the loop
*
* @param myCurrencyToFind
* @return
*/

private static void lookUpCurrency(String myCurrencyToFind) {

// An boolean variable to keep track of whether the currency is found or not

       boolean currencyFound = false;
       // For loop to iterate over CURRENCY_CODES array
       for(int i=0;i<MAX_CURRENCIES;i++)
{
   // If the currency entered by user is equal to the currency at index i, break the loop
   if(CURRENCY_CODES[i].equals(myCurrencyToFind))
   {
       System.out.printf("%s was found at index %d\n",CURRENCY_CODES[i],i);

// Currency is found
       currencyFound = true;
                       break;
   }
}
  
// If the currency is not found in the array, then print that it's not found
if(!currencyFound)
{
                   System.out.println("Currency Code not found");
               }
}

  
// If the currency is not found in the array
               System.out.println("Currency Code not found");
}
  
/**
* Prompt for a currency to find
* Call the lookUpCurrency with the inputted currency code
* Display the found result
* Prompt to try again and exit this method only if the choice is to not continue
*/
  
private static void findMyCurrency()
{
   // Scanner object to read input
   Scanner s = new Scanner(System.in);
   // Choice variable to store the user choice
   char choice = 'Y';
   // Until the user choice is -1, this loop is iterated
   while(choice!='N')
   {
       // Prompting the user to enter the currency
       System.out.println("Enter the currency needed to be searched");
       // Reading the input
       String userCurrency = s.nextLine();
       // Calling the method lookUpCurrency
               lookUpCurrency(userCurrency);
      
       // Prompting the user to enter the choice
       System.out.println("Retry Y/N ?");
       // Reading the user choice
       choice = s.nextLine().charAt(0);
   }
}
  
public static void main(String[] args) {
       // Loading the currency codes
loadCurrencyCodes();
// Showing the currency codes to the user
showCurrencies();
// Finding the currency entered by the user in the currency codes array
findMyCurrency();
System.out.println("The program has been terminated");

}
}

Answer 1

import java.util.Currency;
import java.util.Iterator;
import java.util.Set;
import java.util.Scanner;

public class CheckCurrencyCode {

// Sets the MAX_CURRENCIES value from the Currency Object
        static int MAX_CURRENCIES = Currency.getAvailableCurrencies().size();
        static String[] CURRENCY_CODES = new String[MAX_CURRENCIES];

        /**
         * This method will load the currency_Codes array with 3 char codes. It does not
         * need to change
         */

        private static void loadCurrencyCodes() {
                Set<Currency> currencies = Currency.getAvailableCurrencies();
                Iterator<Currency> i = currencies.iterator();
                int idx = 0;
                while (i.hasNext()) {
                        CURRENCY_CODES[idx++] = i.next().getCurrencyCode();
                }
        }

        /**
         * Raw display of the Currency_codes; Could also use
         * System.out.println(Arrays.toString(CURRENCY_CODES)); It does not need to
         * change
         */
        private static void showCurrencies() {
                System.out.println("The valid currency codes are:");
                for (int idx = 0; idx < MAX_CURRENCIES; ++idx) {
                        System.out.print(CURRENCY_CODES[idx] + ",");
                }

                System.out.println();
//System.out.println(Arrays.toString(CURRENCY_CODES));
        }

        /**
         * Look up the given currency here and set the return value to true if found or
         * false if not found
         *
         * Hint: Use a FOR loop to traverse the loop
         *
         * @param myCurrencyToFind
         * @return
         */
        private static boolean lookUpCurrency(String myCurrencyToFind) {

                // For loop to iterate over CURRENCY_CODES array
                for (int i = 0; i < MAX_CURRENCIES; i++) {
                        // If the currency entered by user is equal to the currency at index i, break
                        // the loop
                        if (CURRENCY_CODES[i].equals(myCurrencyToFind)) {
                                System.out.printf("%s was found at index %d\n", CURRENCY_CODES[i], i);
                                return true;
                        }
                }

                return false;
        }

        /**
         * Prompt for a currency to find Call the lookUpCurrency with the inputted
         * currency code Display the found result Prompt to try again and exit this
         * method only if the choice is to not continue
         */

        private static void findMyCurrency() {
                // Scanner object to read input
                Scanner s = new Scanner(System.in);
                // Choice variable to store the user choice
                char choice = 'Y';
                // Until the user choice is -1, this loop is iterated
                while (choice != 'N') {
                        // Prompting the user to enter the currency
                        System.out.println("Enter the currency needed to be searched");
                        // Reading the input
                        String userCurrency = s.nextLine();
                        // Calling the method lookUpCurrency
                        boolean currencyFound = lookUpCurrency(userCurrency);
                        if (!currencyFound) {
                                System.out.println("Currency Code not found");
                        }

                        // Prompting the user to enter the choice
                        System.out.println("Retry Y/N ?");
                        // Reading the user choice
                        choice = s.nextLine().charAt(0);
                }
        }

        public static void main(String[] args) {
                // Loading the currency codes
                loadCurrencyCodes();
// Showing the currency codes to the user
                showCurrencies();
// Finding the currency entered by the user in the currency codes array
                findMyCurrency();
                System.out.println("The program has been terminated");

        }
}

It works fine.. I made some small changes so that it adheres to the instructions.. Please upvote. Thanks!