Resource Bundle

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Resource Bundle

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Introduction
It is used to support multi-language in an
Application that is called internationalization
(i18n).
It is used to remove hard coding from an
application by making configuration files and
read from resource bundle.
It moves all configurable parameters into a
text file in form of key=value pairs.

Class Hierarchy
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Resource Bundle
PropertyResourceBundle ListResourceBundle

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app.properties – create file
Create a text file having extension .properties.
Add key=value pairs of configurable data. Entries
will look like:
o #Database connection Parameters
o url=jdbc:mysql://localhost:3306/ocha
o driver=com.mysql.jdbc.Driver
o username=root
o password=pwd

Read from ResourceBundle
 Assuming that text file app.properties file is kept in
in.co.sunrays.rb package.
 public static void main(String[] args) {
 ResourceBundle rb =
 ResourceBundle.getBundle("in.co.sunrays.rb.app");
 //Pass key and get value
 String url = rb.getString("url");
 String driver = rb.getString("driver");
 String user = rb.getString("username");
 String password = rb.getString("password");
 }
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Multilanguage Support
Can be achieved by setting Locale to resource
bundle.
For each locale you have to create a separate
.properties file.
Suppose you have to support three languages
English ( default ), Hindi and Spanish then you will
create:
o app.properties (default is English)
o app_hi.properties ( for Hindi )
o app_sp.properties ( for Spanish )
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Create Property Files
app.properties
o greeting=Hello, how are you?
app_hi.properties
o greeting=हैलो, कै से हो?
app_sp.properties
o greeting=Hola, cómo estás?
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Run and see the output
 //Default Locale
 ResourceBundle rb = ResourceBundle.getBundle("in.co.sunrays.rb.app");
 System.out.println(rb.getString("greeting"));
 //Set Locale to Spanish
 rb = ResourceBundle.getBundle("in.co.sunrays.rb.app", new Locale("sp"));
 //Set Locale to Hindi
 rb = ResourceBundle.getBundle("in.co.sunrays.rb.app", new Locale("hi"));
 Output
o Hello, how are you?
 Hola, cómo estás?
 हैलो, कै से हो?

Multi-Language Support
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What is Locale?
A Locale object represents a specific geographical,
political, or cultural region.
Locale has three constructors that accepts:
o Language : uses two character code to represent a
language
 i.e. en : English, sp: Spanish, hi : Hindi
o Country : accepts valid international country code
 i.e. US: USA, IN : India, UK : United Kingdom.
o Variant: any arbitrary value used to indicate a variation
of a Locale, say state name MP, UP, HP, NY, TX, CT
etc.
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Locale Constructors
Constructors:
o Locale(String language)
o Locale(String language, String country)
o Locale(String language, String country, String variant)
Locale locale = new Locale(“hi", “IN");
o It searches key in app_hi_IN.properties file.
Locale locale = new Locale(“hi", “IN“,”UP”);
o It searches key in app_hi_IN_UP.properties file.
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Say NO to
Hard Coding
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Say YES to
Resource Bundle
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Disclaimer
This is an educational presentation to enhance the
skill of computer science students.
This presentation is available for free to computer
science students.
Some internet images from different URLs are
used in this presentation to simplify technical
examples and correlate examples with the real
world.
We are grateful to owners of these URLs and
pictures.
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Thank You!
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