5. Java 7: Localization

Question 1

A Java Locale String exists of three different parts, name these parts.

Answer 1

1. The language (mandatory, only lower case letters)
2. The country (optional, only capital letters)
3. The variant (often used for dialect, optional, only capital letters)

Question 2

What are the four ways to create a Locale object in Java?

Answer 2

java.util.Locale.Builder
new Locale.Builder().setLanguage(“nl”).setRegion(“NL”).build();

java.util.Locale
new Locale(String language);
new Locale(String language, String country);
new Locale(String language, String country, String variant)

forLanguageTag factory method
Locale.forLanguageTag(“nl-NL”);

Locale Constants
Locale.CANADA_FRENCH;

Question 3

How to get the default Locale of the JVM?

Answer 3

Locale.getDefault();

Question 4

How to set the default Locale of the JVM?

Answer 4

Locale.setDefault(Locale locale);

Question 5

How to retrieve a Resource bundle for the nl-NL locale for the bundle named MyApp?

Answer 5

Locale locale = new Locale("nl", "NL");
ResourceBundle.getBundle("MyApp", locale);

Question 6

Given the following classes what is the result:
Locale.setDefault(Locale.forLanguageTag(“nl”);
public void MyResources extends ResourceBundle {}
public void MyResources_nl extends MyResources {}

ResourceBundle.getBundle(“MyResources”, “de”);

Answer 6

getBundle() will return MyResources_nl

It will first try to find a MyResources class for the de language. It can’t find one so it tries the default “nl”. It can find a class. If MyResources_nl did not exist it would have returned the MyResources class. If the MyResources class did not exist it would throw a MissingResourceException.

Question 7

ResourceBundle has two subclasses name these two and their uses.

Answer 7

1. PropertyResourceBundle
   Is backed by a properties file. The propertie file consists of key-value pairs of the String type. The naming of these files would be.
   baseName.properties
   baseName_nl.properties
   baseName_en_GB.properties
2. ListResourceBundle
   Handles the properties in a easy to use List. Can also store other non-String objects.

Question 8

Given the following classes are in package foo.bar and the following code. What is the result?
public void MyResources extends ResourceBundle {}
public void MyResources_nl extends MyResources {}

ResourceBundle.getBundle(“MyResources”, “de”);

Answer 8

The ResourceBundle can’t be found. You should use the fullly qualified name for the bundle: foo.bar.MyResources

Question 9

What is the order ResourceBundle.getBundle uses to search for the requested Bundle?

Answer 9

1. baseName_language_country_variant
2. baseName_language_country
3. baseName_language
4. baseName_defaultlanguage_defaultcountry_defaultvariant
5. baseName_defaultlanguage_defaultcountry
6. baseName_defaultlanguage
7. baseName

Question 10

Given the following classes and code what is the Result?
public void MyResources extends ResourceBundle {}

ResourceBundle.getBundle(“MyResource”, new Locale(“nl”));

Answer 10

Throws a MissingResourceException MyResource is not a known resource.

Question 11

Given the following classes and code what is the Result?
public void MyResources extends ResourceBundle {}
And a properties file: MyResource.properties

ResourceBundle.getBundle(“MyResources”, new Locale(“nl”));

What is the type of the ResourceBundle?

Answer 11

MyResources.class

getBundle will always first look for an Class before looking for an properties file. If only a properties file is found the returned type would have been: PropertyResourceBundle

Question 12

Given the following integer how can you format it using the “us” locale?

int i = 9_000_000;

Answer 12

Locale l = Locale.US;
NumberFormat formatter = NumberFormat.getNumberInstance(l);
formatter.format(i);

Question 13

Given the following integer how can you format it as money for the “us” locale?

int i = 9_000_000;

Answer 13

Locale l = Locale.US;
NumberFormat formatter = NumberFormat.geCurrencyInstance(l);
formatter.format(i);

Question 14

Given a date object how can you print it using the “us” locale?

Answer 14

Date d = new Date();
DateFormat formatter = DateFormat.getDateInstance(Locale.US);
formatter.format(d);

Question 15

Given a date object how can you print it in the format yyyy MMMM dd for the “us” locale?

Answer 15

Date d = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy MMMM dd", Locale.US);
sdf.format(d);

Question 16

Given the following code, what is the result?
Locale l = Locale.getDefault(); DateFormat df = DateFormat.getDateInstance(l); System.out.println(l.getCountry()+” “+ df.format(dt));

Answer 16

Wont compile. DateFormat doest not have a method getDateInstance(Local locale);

Valid arguments for getDateInstance are:
getDateInstance();
getDateInstance(int style);
getDateInstance(int style, Local locale);

Question 17

Consider the following code.  
public class TestClass { 
   public static void main(String[] args) throws Exception{
      Date d = new Date(); 
      DateFormat //1 INSERT CODE HERE  
      String s = //2 INSERT CODE HERE  
      System.out.println(s); 
   } 
}  

What should be inserted at //1 and //2 above so that it will print the date in default date format for the UK Locale?

Answer 17

df = DateFormat.getDateInstance(DateFormat.DEFAULT, Locale.UK); and df.format(d);