Develop Reference

ArrayList in Class A and user trigger the output from Class B. How do I correctly get an output from an ArrayList?

I doing a bigger school project (first part of basic objective programming in java - so not touched extended, polyphorism etc yet, thats next part), but run in to a small problem and tried for couple of days to find solution (thru books and internet). I constructed different ArrayLists in one class and different classes (at least two) should get access to them.
public class Customer
{
public void subMenuCustomer()
{
............code............
int subMenuCust;
ServiceLogic addCustomer = new ServiceLogic();
ServiceLogic listAllCustomers = new ServiceLogic();
while(true)
{
System.out.println("Please Choose your preference: ");
System.out.println("Create account, press \"1\": ");
System.out.println("Get list of clustomers, press \"2\": ");
System.out.println("Log out, press \"0\": ";
subMenuCust = input.nextInt();
switch(subMenuCust)
{
case 1 ://Call method createCustomer in class ServiceTech to add new customers
addCustomer.createCustomer(name, lastname, ssNo);
break;
case 3
listAllCustomers.getCustomer();
............more code..............
}
}
When user has added details (social secuity number, name and lastname) it is stored in seperate ArrayList. These three ArrayList are added(merge/concat) together to a fourth ArayList, listCustomer , so that all elements from the three ArrayList end up in same index [101 -54 Clark Kent, 242-42 Linus Thorvalds, ...].
import java.util.ArrayList;
import java.util.Scanner;
public class ServiceLogic
{
//Create new ArrayLists of Strings
private ArrayList<String> listSSNoCustomers = new ArrayList<>();
private ArrayList<String> listNameCustomers = new ArrayList<>();
private ArrayList<String> listLastnameCustomers = new ArrayList<>();
private ArrayList<String> listCustomers;
Scanner input = new Scanner(System.in);
public boolean createCustomer(String name, String lastname, String ssNo) //
{
System.out.println("Write social security number; ");
ssNo = input.next();
//loop to check that it is a uniq social security number
for(String ssNumber : listSSNoCustomers)
{
if (ssNumber.equals(ssNo))
{
System.out.println("This customer already exist. Must be uniq social security number.");
return true;
}
}
//If social security number is not on list, add it
//and continue add first name and surname
listSSNoCustomers.add(ssNo);
System.out.println(ssNo);
System.out.println("Write firstname; ");
name = input.next();
listNameCustomers.add(name);
System.out.println(name);
System.out.println("Write lastnamame; ");
surname = input.next();
listSurnameCustomers.add(lastname);
System.out.println(lastname);
return false;
}
public void setListCustomer(ArrayList<String> listCustomers)
{
this.listCustomers = listCustomers;
}
public ArrayList<String> getCustomer()
{
//ArrayList<String> listCustomers = new ArrayList<>();
for(int i = 0; i <listSSNoCustomers.size(); i++)
{
listCustomers.add(listSSNoCustomers.get(i) + " " + listNameCustomers.get(i) + " " + listFirstnameCustomers.get(i));
}
System.out.println("customer" + listCustomers);
return listCustomers;
}
}
According to the specification we got, when user want to see list of all customer the outputs should be in format [666-66 Bruce Wayne, 242-42 Linus Thorvalds, ...].
When user (staff) choose to enter details in class Customer ( Case 1 ) it works and elements get stored in the Arraylists for social security numbers, name and lastname (have checked that) .
The problem: when I run I can add customers, but when I try to get a list of customer the output: [] . I tried different solution, but same output only empty between the brackets.
So the question, how do I get ouput to work when user choose case 2 to get a list of all cutomers?

Eclipse Syntax error on token "}", delete this token and Syntax error, insert "}" to complete ClassBody

I am trying to make a practice program for a bookstore clerk that allows the clerk to add, remove, edit, and search for books in its database. I have all but made the entire program however I am getting stuck on 2 errors. It is a total of 234 lines of code in all so I will try to shorten it to the relevant parts to make it easier on those willing to help me. I am using Eclipse with JDE and JDK 10. The Eclipse project was initiated using the JavaSE-10 execution environment as far as I am aware. Below are the 2 methods causing the errors.
public class Bookstore {
public static void main(String[] args) {
try(
//Creating table connection and statement
Connection conn = DriverManager.getConnection("***********",
"****", "*********"); //Please note that I blocked out the actual connection information here
Statement stmt = conn.createStatement();
){
Scanner input = new Scanner(System.in);
int selection = 0;
//Menu for action selection and user input
while(selection != 5) {
System.out.println("Please enter the number corresponding to the action you would like to take:\n"
+ "1. Enter book\n"
+ "2. Update book\n"
+ "3. Delete book\n"
+ "4. Search books\n"
+ "5. Exit");
selection = input.nextInt();
//Selection sorting
if(selection == 1) {
//Collecting book information
System.out.println("Please enter the Title of the book you would like to put into the system: ");
String title = input.next();
System.out.println("Please enter the Author of said book: ");
String author = input.next();
System.out.println("Please enter the number of said book currently in stock: ");
int qty = input.nextInt();
//Sending info to the addBook method
addBook(title, author, qty, stmt);
} else if(selection == 2) {
//Collecting book information
System.out.println("Please enter the id of the book you would like to update: ");
int id = input.nextInt();
//Sending info to the updateBook method
updateBook(id, stmt);
} else if(selection == 3) {
//Collecting book information
System.out.print("Please enter the id of the book you would like to delete from the system: ");
int id = input.nextInt();
//Sending info to deleteBook method
deleteBook(id, stmt);
} else if(selection == 4) {
searchStore(stmt);
} else if(selection == 5) {
System.out.println("Goodbye");
input.close();
} else { //Invalid entry handler
System.out.println("Sorry, that isn't a valid selection.");
}
}
} catch(SQLException ex) {
ex.printStackTrace();
}
}
} //This is the line giving me the error "Syntax error on token "}", delete this token"
Now I have already done some research regarding the error at the bottom of this block of code. As far as I can tell I am not missing any brackets and there are no variables or anything being created outside of a class that would cause this error. The only other solution I have been able to find is that "Eclipse is just being weird".
My second error comes from this block of code:
public static void resultSetPrinter(ResultSet rset) {
while(rset.next()) {
String title = rset.getString("Title");
String author = rset.getString("Author");
int qty = rset.getInt("qty");
System.out.println("Title: " + title + "\nAuthor: " + author + "\nNumber in stock: " + qty + "\n\n");
}
if(rset == null) {
System.out.println("No records for the entry could be found.");
}
} //This is the line giving me the "Syntax error, insert "}" to complete ClassBody" error
I have also done some research regarding the error at the bottom of this block and when I do remove the bracket as requested the error just jumps up to the method before this one. I haven't included the other 4 methods in the class to try and reduce the headache of running through all this code since they aren't giving me errors. Any help would be greatly appreciated at this point, I am completely stumped.

Thanks mainly to Elliott Frisch I have found my answer. Essentially I needed to put all my methods into my main class by the name of Bookstore. I moved the } to the end of my program and added try catch statements for each method. For example I changed the last code block I put in my question to:
public static void resultSetPrinter(ResultSet rset) {
try {
if(rset.next()) {
while(rset.next()) {
String title = rset.getString("Title");
String author = rset.getString("Author");
int qty = rset.getInt("Qty");
System.out.println("Title: " + title + "\nAuthor: " + author + "\nNumber in stock: " + qty + "\n");
}
} else {
System.out.println("No records for the entry could be found.\n");
}
} catch(SQLException ex) {
ex.printStackTrace();
}
}
You'll also note that I added an if else statement to check if the ResultSet rset was empty, if it wasn't I proceeded as normal and if it was I printed a simple message to let the user know nothing was found.
Thank you both Elliott Frisch and Marco13 for the asssistance.

I can only access first item in the list

public class Catalogue() {
private List<Book> booksAvailable;
private List<Book> booksRented:
public Catalogue() {
booksAvailable.add(new Book("Matrix", 1999, new Genre("SciFi"), 3));
booksAvailable.add(new Book("Jurassic Park", 1999, new Genre("SciFi"), 3));
boosAvailable.add(new Book("Terminator", 1999, new Genre("SciFi"), 3));
booksRented = new LinkedList<Book> ();
}
public void rentBook() {
System.out.println("Rent a book:");
System.out.println("Enter the title of a book you want to rent: ");
String name = In.NextLine();
for (Book book: booksAvailable) {
if (book.getName.equals(name)) {
System.out.println("Renting " + name);
booksAvailable.remove(book);
booksRented.add(book);
break;
} else {
System.out.println("No such books found");
}
}
}
}
While running this code can only rent the Matrix book. When I try to rent another book like Jurassic park it says that no books found. When I close the program and again run it and try to rent the second book then it again says the books not found. Please help me with this problem. What is the problem that i have in this code. Thanks

As others have pointer out modifying a list while you're iterating over it is dangerous.
I would recommend trying it with a HashMap instead, especially if name is the only field you're looking at.
public class Catalogue {
private Map<String, Book> booksAvailable;
private Map<String, Book> booksRented;
public Catalogue() {
booksAvailable = new HashMap<>();
booksAvailable.put("Matrix", new Book("Matrix", 1999, new Genre("SciFi"), 3));
booksAvailable.put("Jurassic Park", new Book("Jurassic Park", 1999, new Genre("SciFi"), 3));
booksAvailable.put("Terminator", new Book("Terminator", 1999, new Genre("SciFi"), 3));
booksRented = new HashMap<>();
}
public void rentBook() {
System.out.println("Rent a book:");
System.out.println("Enter the title of a book you want to rent: ");
Scanner scanner = new Scanner(System.in);
String name = scanner.nextLine();
if (booksAvailable.containsKey(name)) {
Book book = booksAvailable.get(name);
System.out.println("Renting " + name);
booksAvailable.remove(name);
booksRented.put(name, book);
} else {
System.out.println("No such books found");
}
}
}

I just tried your code(after modifying it to compile) and it works.
However when running on for example Jurasic Park it will say that the book is not found and then it will rent it, because that print statement is in the for loop.
I tried rewriting it to use streams and optionals, and I got this code that seems to be working
public void rentBook() {
System.out.println("Rent a book:");
System.out.println("Enter the title of a book you want to rent: ");
String name = "Jurassic Park";
Optional<Book> book = booksAvailable.stream().filter(b -> b.name.equals(name)).findFirst();
if(book.isPresent()) {
System.out.println("Renting " + name);
booksAvailable.remove(book.get());
booksRented.add(book.get());
}
else
System.out.println("No such book found");
}

When you call booksAvailable.remove() it will effectively removed from current iteration.
Hence when you access next(), it might result in unexpected behavior.
Edit
You cannot rent other book other than first book because of your code handling.
You have System.out.println("No such books found"); in the else statement inside loop. So if you input a book other than the first book, the test fail and the statement is printed.
To correct this you can use a flag to indicate a book is found or not, and print the statement outside the loop;
boolean rented = false;
for (Book b : books) {
if (found) {
rented = true;
}
}
if (!rented) {
// print no such book message
}

Getting NoSuchElementException using Scanner class

I am getting the infamous NoSuchElementException when reading from a "|" delimited text file using the scanner class. I am taking the values of each token and assigning them to values within a separate class using setter methods. I can't seem to pinpoint the error.
Here is my code:
void readFromFile(String fileName)
{
operas.clear();
Scanner input = new Scanner(new File(fileName));
while(input.hasNextLine())
{
String line = input.nextLine();
Opera opera = new Opera();
StringTokenizer stringTokenizer = new StringTokenizer(line, "|");
while(stringTokenizer.hasMoreTokens())
{
opera.setTitle(stringTokenizer.nextToken());
opera.setComposer(stringTokenizer.nextToken());
opera.setYear(Integer.parseInt(stringTokenizer.nextToken()));
opera.setCity(stringTokenizer.nextToken());
opera.setSynopsis(stringTokenizer.nextToken());
opera.setLink(stringTokenizer.nextToken());
}
operas.add(opera);
}
input.close();
}
And the text file is written as such (sorry it's so lengthy):
Giulio Cesare|George Frideric Handel|1724|London|Tells the story loosely based on the events of the Roman Civil War (48-47 B.C.) in which Julius Caesar has defeated Pompey and gone to Alexandria in search of him. The kingdom, ruled by Cleopatra and younger brother Ptolemy, is met by Pompey pleading for refuge from his conqueror.|https://www.youtube.com/watch?v=M1UmvCaobDg
Carmen|Georges Bizet|1875|Paris|Set in Seville around the year 1830, the opera deals with the love and jealousy of Don José, who is lured away from his duty as a soldier and his beloved Micaëla by the gypsy factory-girl Carmen, whom he allows to escape from custody.|https://www.youtube.com/watch?v=zTDMvyj4TFg
Die ZauberFlote|Wolfgang Amadeus Mozart|1791|Vienna|The Queen of the Night persuades Prince Tamino to rescue her daughter Pamina from captivity under the high priest Sarastro; instead, he learns the high ideals of Sarastro's community and seeks to join it. Separately, then together, Tamino and Pamina undergo severe trials of initiation, which end in triumph, with the Queen and her cohorts vanquished. The earthy Papageno, who accompanies Tamino on his quest, fails the trials completely but is rewarded anyway with the hand of his ideal female companion Papagena.|https://www.youtube.com/watch?v=Fm-4LdLFr_E
Il Barbiere di Siviglia|Gioachino Rossini|1816|Rome|Count Almaviva comes in disguise to the house of Doctor Bartolo and serenades Rosina, whom Bartolo keeps confined to the house. Figaro the barber, who knows all the town's secrets and scandals, explains to Almaviva that Rosina is Bartolo's ward, not his daughter, and that the doctor intends to marry her.|https://www.youtube.com/watch?v=p97ym1HeCNI
Tosca|Giacomo Puccini|1900|Rome|Tosca is tale of romance over politics; featuring a heroic painter, a despicable ruler and an opera superstar, Tosca herself!|https://www.youtube.com/watch?v=xGDhQwsgMBQ
Salome|Richard Strauss|1905|Dresden|Under the bright moonlight, guard captain, Narraboth, intensely watches Princess Salome, with whom he is madly in love, from a terrace above the banquet hall as she dines with her stepfather and his court.|https://www.youtube.com/watch?v=kInyoCPyFb0
War and Peace|Sergei Prokofiev|1944|Moscow|Based on Tolstoy's literature of War and Peace, the world-weary Prince Andrei Bolkonsky encounters the youthful Natasha Rostova, first in the country, then at a ball in St Petersburg. Enchanted, he asks for her hand in marriage. Unfortunately Natasha has also aroused the curiosity of the dissolute Anatol Kuragin.|https://www.youtube.com/watch?v=2nhOeGhWWkU
Dido and Aeneas|Henry Purcell|1689|London|Tells the tale of the legendary Queen of Carthage, Dido, and the Trojan refugee prince, Aeneas. When Aeneas and his crew become shipwrecked in Carthage, he and the Queen fall in love. In the meantime, witches plot Dido's destruction.|https://www.youtube.com/watch?v=Q3Vs3YXQp5U
Norma|Vincenzo Bellini|1831|Milan|Gaul has been conquered by the Romans. Oroveso, the Arch-Druid longs to lead a Gallic rebellion against the colonial forces. He and all the others wait for the signal to be given by his daughter, the Druid High Priestess Norma. But Norma has fallen in love with the Roman Proconsul, Pollione, and given birth to two children. They have been brought up in secrecy by her confidante Clotilde. Norma still loves Pollione but he has fallen in love with a novice priestess, Adalgisa.|https://www.youtube.com/watch?v=GN75XDDm_DI
Rigoletto|Giuseppe Verdi|1851|Venice|Its tragic story revolves around the licentious Duke of Mantua, his hunch-backed court jester Rigoletto, and Rigoletto's beautiful daughter Gilda. A curse is placed on both the Duke and Rigoletto by a courtier whose daughter the Duke has seduced with Rigoletto's encouragement. The curse comes to fruition when Gilda falls in love with the Duke and sacrifices her life to save him from assassins hired by her father.|https://www.youtube.com/watch?v=nlr9jygEgwM
And the error I'm recieving:
Exception in thread "main" java.util.NoSuchElementException
at java.util.StringTokenizer.nextToken(StringTokenizer.java:349)
at Operas.OperasGUI.readFromFile(OperasGUI.java:118)
at Operas.OperasGUI.<init>(OperasGUI.java:45)
at Operas.OperasGUI.main(OperasGUI.java:607)
Another note is that the error at line 118 is the line where I'm setting the year, the only line I'm parsing a primitive value. Not sure if that has anything to do with it.
Any suggestions? If any more code or info is needed, I'd be happy to provide it.
Thank you.
EDIT:
Here is my complete Operas class:
package Operas;
public class Opera {
private String title;
private String composer;
private int year;
private String city;
private String synopsis;
private String link;
public Opera(){
title = "";
composer = "";
year = 0;
city = "";
synopsis = "";
link = "";
}
public Opera(String title, String composer, int year, String city,
String synopsis, String link)
{
this.title = title;
this.composer = composer;
this.year = year;
this.city = city;
this.synopsis = synopsis;
this.link = link;
}
public Opera(Opera anotherOpera)
{
title = anotherOpera.title;
composer = anotherOpera.composer;
year = anotherOpera.year;
city = anotherOpera.city;
synopsis = anotherOpera.synopsis;
link = anotherOpera.link;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getComposer() {
return composer;
}
public void setComposer(String composer) {
this.composer = composer;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getSynopsis() {
return synopsis;
}
public void setSynopsis(String synopsis) {
this.synopsis = synopsis;
}
public String getLink() {
return link;
}
public void setLink(String link) {
this.link = link;
}
#Override
public String toString()
{
return "Opera{Title = " + title + ", Composer = " + composer + ", Year = " + year +
", City = " + city + ", Synopsis = " + synopsis + ", Link = " + link + '}';
}
public boolean equals(Opera opera)
{
return this.getTitle().equalsIgnoreCase(opera.getTitle()) &&
this.getComposer().equalsIgnoreCase(opera.getComposer());
}
}
Not sure if that helps.

Not sure what you are doing wrong here, the code I have which I believe mimicks your code is:
MAIN:
package helpMe;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.StringTokenizer;
import javax.swing.plaf.synth.SynthSeparatorUI;
public class getIt {
static ArrayList readFromFile(String fileName) throws FileNotFoundException
{
ArrayList<Opera> a = new ArrayList<Opera>();
Scanner input = new Scanner(new File(fileName));
while(input.hasNextLine())
{
String line = input.nextLine();
Opera opera = new Opera();
StringTokenizer stringTokenizer = new StringTokenizer(line, "|");
while(stringTokenizer.hasMoreTokens())
{
opera.setTitle(stringTokenizer.nextToken());
opera.setComposer(stringTokenizer.nextToken());
opera.setYear(Integer.parseInt(stringTokenizer.nextToken()));
opera.setCity(stringTokenizer.nextToken());
opera.setSynopsis(stringTokenizer.nextToken());
opera.setLink(stringTokenizer.nextToken());
}
a.add(opera);
}
input.close();
return a;
}
public static void main(String [] args) throws FileNotFoundException {
ArrayList<Opera> a = new ArrayList<Opera>();
a = readFromFile("thisIsAFile");
for(int i = 0; i< a.size(); i++) {
Opera o = a.get(i);
System.out.println(o.toString());
}
}
}
OPERA CLASS:
package helpMe;
public class Opera {
private String Title;
private String City;
private int Year;
private String Composer;
private String Synopsis;
private String Link;
public Opera(String t, String c, int y, String co, String s, String l) {
Title = t;
City = c;
Year = y;
Composer = co;
Synopsis = s;
Link = l;
}
public Opera() {
Title = "";
City = "";
Year = 0;
Composer = "";
Synopsis = "";
Link = "";
}
public String setTitle(String t) {
return Title = t;
}
public String setCity(String c) {
return City = c;
}
public int setYear(int y) {
return Year = y;
}
public String setComposer(String co) {
return Composer = co;
}
public String setSynopsis(String s) {
return Synopsis = s;
}
public String setLink(String l) {
return Link = l;
}
public String toString() {
String s = Title + City + Composer;
return s;
}
}
TEXT FILE:
Giulio Cesare|George Frideric Handel|1724|London|Tells the story loosely based on the events of the Roman Civil War (48-47 B.C.) in which Julius Caesar has defeated Pompey and gone to Alexandria in search of him. The kingdom, ruled by Cleopatra and younger brother Ptolemy, is met by Pompey pleading for refuge from his conqueror.|https://www.youtube.com/watch?v=M1UmvCaobDg
Carmen|Georges Bizet|1875|Paris|Set in Seville around the year 1830, the opera deals with the love and jealousy of Don José, who is lured away from his duty as a soldier and his beloved Micaëla by the gypsy factory-girl Carmen, whom he allows to escape from custody.|https://www.youtube.com/watch?v=zTDMvyj4TFg
Die ZauberFlote|Wolfgang Amadeus Mozart|1791|Vienna|The Queen of the Night persuades Prince Tamino to rescue her daughter Pamina from captivity under the high priest Sarastro; instead, he learns the high ideals of Sarastro's community and seeks to join it. Separately, then together, Tamino and Pamina undergo severe trials of initiation, which end in triumph, with the Queen and her cohorts vanquished. The earthy Papageno, who accompanies Tamino on his quest, fails the trials completely but is rewarded anyway with the hand of his ideal female companion Papagena.|https://www.youtube.com/watch?v=Fm-4LdLFr_E
Il Barbiere di Siviglia|Gioachino Rossini|1816|Rome|Count Almaviva comes in disguise to the house of Doctor Bartolo and serenades Rosina, whom Bartolo keeps confined to the house. Figaro the barber, who knows all the town's secrets and scandals, explains to Almaviva that Rosina is Bartolo's ward, not his daughter, and that the doctor intends to marry her.|https://www.youtube.com/watch?v=p97ym1HeCNI
Tosca|Giacomo Puccini|1900|Rome|Tosca is tale of romance over politics; featuring a heroic painter, a despicable ruler and an opera superstar, Tosca herself!|https://www.youtube.com/watch?v=xGDhQwsgMBQ
Salome|Richard Strauss|1905|Dresden|Under the bright moonlight, guard captain, Narraboth, intensely watches Princess Salome, with whom he is madly in love, from a terrace above the banquet hall as she dines with her stepfather and his court.|https://www.youtube.com/watch?v=kInyoCPyFb0
War and Peace|Sergei Prokofiev|1944|Moscow|Based on Tolstoy's literature of War and Peace, the world-weary Prince Andrei Bolkonsky encounters the youthful Natasha Rostova, first in the country, then at a ball in St Petersburg. Enchanted, he asks for her hand in marriage. Unfortunately Natasha has also aroused the curiosity of the dissolute Anatol Kuragin.|https://www.youtube.com/watch?v=2nhOeGhWWkU
Dido and Aeneas|Henry Purcell|1689|London|Tells the tale of the legendary Queen of Carthage, Dido, and the Trojan refugee prince, Aeneas. When Aeneas and his crew become shipwrecked in Carthage, he and the Queen fall in love. In the meantime, witches plot Dido's destruction.|https://www.youtube.com/watch?v=Q3Vs3YXQp5U
Norma|Vincenzo Bellini|1831|Milan|Gaul has been conquered by the Romans. Oroveso, the Arch-Druid longs to lead a Gallic rebellion against the colonial forces. He and all the others wait for the signal to be given by his daughter, the Druid High Priestess Norma. But Norma has fallen in love with the Roman Proconsul, Pollione, and given birth to two children. They have been brought up in secrecy by her confidante Clotilde. Norma still loves Pollione but he has fallen in love with a novice priestess, Adalgisa.|https://www.youtube.com/watch?v=GN75XDDm_DI
Rigoletto|Giuseppe Verdi|1851|Venice|Its tragic story revolves around the licentious Duke of Mantua, his hunch-backed court jester Rigoletto, and Rigoletto's beautiful daughter Gilda. A curse is placed on both the Duke and Rigoletto by a courtier whose daughter the Duke has seduced with Rigoletto's encouragement. The curse comes to fruition when Gilda falls in love with the Duke and sacrifices her life to save him from assassins hired by her father.|https://www.youtube.com/watch?v=nlr9jygEgwM
OUTPUT
Giulio CesareLondonGeorge Frideric Handel
CarmenParisGeorges Bizet
Die ZauberFloteViennaWolfgang Amadeus Mozart
Il Barbiere di SivigliaRomeGioachino Rossini
ToscaRomeGiacomo Puccini
SalomeDresdenRichard Strauss
War and PeaceMoscowSergei Prokofiev
Dido and AeneasLondonHenry Purcell
NormaMilanVincenzo Bellini
RigolettoVeniceGiuseppe Verdi
Not sure if that helps but it seems to work just fine and I run into no problems reading from the text file at all.

How to create a Multi-Language Alexa Skill using Java?

I'm quite new to VUI and Alexa. I developed a good working Skill for Alexa Voice Services. Now I want to add a second language. I've found a tutorial in the develop documation, but I'm using Eclipse and Java to create my Lambda function like this walkthrough.
The problem is, that I have no idea how to enable a second language option in the Lambda function. I have to use the same Lambda function for both languages.
My StreamRequestHandler:
public class ApiOmatBlogSpeechletStreamRequestHandler extends SpeechletRequestStreamHandler {
private static final Set<String> supportedApplicationIds = new HashSet<String>();
static {
/*
* This Id can be found on https://developer.amazon.com/edw/home.html#/ "Edit" the relevant
* Alexa Skill and put the relevant Application Ids in this Set.
*/
supportedApplicationIds.add("amzn1.ask.skill.xxxxxxxx");
}
public ApiOmatBlogSpeechletStreamRequestHandler() {
super(new ApiOmatBlogSkillSpeechlet(), supportedApplicationIds);
System.out.println("Super ApiOmatBlogSpeechletStreamRequestHandler");
}
}
My Spechlet:
public SpeechletResponse onIntent(IntentRequest intentRequest, Session session) {
Intent intent = intentRequest.getIntent();
String intentName = (intent != null) ? intent.getName() : null;
System.out.println("onIntent requestId={ " + intentRequest.getRequestId() + " }, sessionId={ "
+ session.getSessionId() + " } ");
Integer step = (Integer) session.getAttribute("step");
System.out.println("IntentName= " + intentName + " | step = " + step);
if ("AMAZON.HelpIntent".equals(intentName)) {
return getHelpResponse();
} else if ("AMAZON.StopIntent".equals(intentName)) {
return getStopResponse();
} else if (step != null) {
return testing(intent, session, step);
} else {
if ("TestIntent".equals(intentName)) {
step = 1;
session.setAttribute("step", step);
return testing(intent, session, step);
} else {
SsmlOutputSpeech speechText = new SsmlOutputSpeech();
speechText.setSsml("<speak> " + "The intent is invalid." + "Please repeat your demand. "
+ "<break time='0.5s'/> " + " </speak>");
// Create reprompt
PlainTextOutputSpeech speech2 = new PlainTextOutputSpeech();
speech2.setText("I'm sorry. Please repeat your statement.");
Reprompt reprompt = new Reprompt();
reprompt.setOutputSpeech(speech2);
return SpeechletResponse.newAskResponse(speechText, reprompt);
}
}
}
/**
* This function will be called if you say 'start'
*/
public SpeechletResponse onLaunch(final LaunchRequest request, final Session session) throws SpeechletException {
System.out.println(
"onLaunch requestId={ " + request.getRequestId() + " }, sessionId={ " + session.getSessionId() + " } ");
return getHelpResponse();
}
Thank you

It's quite difficult to settle it up.
I solved it by asking, which language the user speaks.
In the Spechlet.java I added the code:
private Boolean german;
public SpeechletResponse onIntent(IntentRequest intentRequest, Session session) {
if (intentRequest.getLocale().getLanguage().equals(new Locale("de").getLanguage())){
System.out.println("Spoken language == Deutsch");
german=true;
}else{
System.out.println("Spoken language == Englisch");
german=false;
}
...
}
and follwing I can work with the Boolean german and set up my response.
If there is a better solution, which works on two languages, than I would looking forward to a posted answer or comment. But for the moment this is the best workaround to handle multiple language in Java.

You don't need different Lambda logic to support each language. You can create multiple Lambda functions based on the region to avoid latency. If you choose to deploy your code to multiple endpoints, you must maintain the same code at all endpoints. The code must handle all languages you support. The only setup you need to do is to add Alexa supported language in Alexa Skill Information, which is marked below,
Please read official documentation here