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Easy Learn Java: Programming Articles, Examples and Tips - Page 42


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I have developed an application. At present the application is in English Langua

Go to all tips in Text processing

Question: I have developed an application. At present the application is in English Language. Now I need to convert this site to another languages but don't know how to do it.
Can anybody tell me the way to do it... I do not want to rewrite every time my code...

Part 1.
Answer: The best way is to use Resource Bundles. Keep different language versions in resource bundle file. Your program can load it from the resource bundle that is appropriate for the current user's locale.

This allows you to write programs that can:
be easily localized, or translated, into different languages handle multiple locales at once be easily modified later to support even more locales

For example, the base name of a family of resource bundles might be "MyResources". The family should have a default resource bundle which simply has the same name as its family - "MyResources" - and will be used as the bundle of last resort if a specific locale is not supported. The family can then provide as many locale-specific members as needed, for example a German one named "MyResources_de".

Each resource bundle in a family contains the same items, but the items have been translated for the locale represented by that resource bundle. For example, both "MyResources" and "MyResources_de" may have a String that's used on a button for canceling operations. In "MyResources" the String may contain "Cancel" and in "MyResources_de" it may contain "Abbrechen".

If there are different resources for different countries, you can make specializations: for example, "MyResources_de_CH" contains objects for the German language (de) in Switzerland (CH). If you want to only modify some of the resources in the specialization, you can do so.

When your program needs a locale-specific object, it loads the ResourceBundle class using the getBundle method:

ResourceBundle myResources =
ResourceBundle.getBundle("MyResources", currentLocale);

Resource bundles contain key/value pairs. The keys uniquely identify a locale-specific object in the bundle. Here's an example of a ListResourceBundle that contains two key/value pairs:

public class MyResources extends ListResourceBundle {
public Object[][] getContents() {
return contents;
}
static final Object[][] contents = {
// LOCALIZE THIS
{"OkKey", "OK"},
{"CancelKey", "Cancel"},
// END OF MATERIAL TO LOCALIZE
};
}

Keys are always Strings. In this example, the keys are "OkKey" and "CancelKey". In the above example, the values are also Strings--"OK" and "Cancel"--but they don't have to be. The values can be any type of object.

You retrieve an object from resource bundle using the appropriate getter method. Because "OkKey" and "CancelKey" are both strings, you would use getString to retrieve them:

button1 = new Button(myResources.getString("OkKey"));
button2 = new Button(myResources.getString("CancelKey"));
The getter methods all require the key as an argument and return the object if found. If the object is not found, the getter method throws a MissingResourceException.
Besides getString, ResourceBundle also provides a method for getting string arrays, getStringArray, as well as a generic getObject method for any other type of object. When using getObject, you'll have to cast the result to the appropriate type. For example:

int[] myIntegers = (int[]) myResources.getObject("intList");

The Java 2 platform provides two subclasses of ResourceBundle, ListResourceBundle and PropertyResourceBundle, that provide a fairly simple way to create resources. As you saw briefly in a previous example, ListResourceBundle manages its resource as a List of key/value pairs. PropertyResourceBundle uses a properties file to manage its resources.

If ListResourceBundle or PropertyResourceBundle do not suit your needs, you can write your own ResourceBundle subclass. Your subclasses must override two methods: handleGetObject and getKeys().

End of part 1, part2 will be published in our next tip

***************************************
Our older tips: March 22, 2001 - October 21, 2002 read here.
All published and not published on site tips you can find here



comments? | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Monday, April 14, 2003 (00:00:00) (4372 reads)

Is there a way to detect if the CAPS LOCK key is active? I want to detect it eve

Go to all tips in Swing, AWT

Question: Is there a way in Java to detect if the CAPS LOCK key is active? I want to detect it even if it was activated before my Java application is started.

I can detect if the user press the key, but not if the key has been pressed before.

Answer: Java example code is here:

java.awt.Toolkit.getDefaultToolkit().getLockingKeyState(
java.awt.event.KeyEvent.VK_CAPS_LOCK);

Keyboard Light Test Java code example here.

Keyboard Flasher  Java code example here.



14 comments | Printer Friendly Page  Send to a Friend | Score: 4
Posted by jalex on Friday, April 11, 2003 (00:00:00) (5891 reads)

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