How to get Locale from Character.UnicodeBlock

Question

Hi All,
For Ex: I enter Japanese language (Hiragana/KATAKANA characters) in the text field. My expected result is Locale: 'ja' (this is belongs to Japaneses language)
How to get locale value from Character.UnicodeBlock.
or we have any other way to get locale value from "input locale" means what ever language( Japanese /Chinese/other languages supported by java) i enter in the text box and i want to identify the locale of the text.
This is the example program i found in the forum.
import java.awt.BorderLayout;
import java.nio.charset.Charset;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
public class TestSBC {
public static void main(String[] args) {
     SwingUtilities.invokeLater(new Runnable() {
     @Override
     public void run() {
          new TestSBC().createGUI();
private void createGUI() {
     JFrame frame = new JFrame();
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     final JLabel messageLabel = new JLabel("Here comes a message",
          JLabel.CENTER);
     final JTextField textField = new JTextField();
     textField.getDocument().addDocumentListener(new DocumentListener() {
     @Override
     public void changedUpdate(DocumentEvent e) {
          checkEvent(e);
     @Override
     public void insertUpdate(DocumentEvent e) {
          checkEvent(e);
     @Override
     public void removeUpdate(DocumentEvent e) {
          checkEvent(e);
     private void checkEvent(DocumentEvent e) {
          messageLabel
               .setText(validateText(textField.getText()) ? "KATAKANA"
                    : "other");
     frame.add(messageLabel, BorderLayout.PAGE_END);
     frame.add(textField, BorderLayout.CENTER);
     frame.pack();
     frame.setLocationRelativeTo(null);
     frame.setVisible(true);
private boolean isKatakana(char c) {
     Character.UnicodeBlock unicodeBlock = Character.UnicodeBlock.of(c);
     System.out.println("unicodeBlock : " + unicodeBlock);
     boolean isKatakana = Character.UnicodeBlock.KATAKANA
          .equals(unicodeBlock);
     System.out.println(isKatakana);
     return isKatakana;
private boolean validateText(String text) {
     char[] chars = text.toCharArray();
     for (char c : chars) {
     if (isKatakana(c)) {
          return true;
     return false;
Thanks for your help...

Answer 1

Hi Joerg22
Thanks for your response.
Can you please tell me ...is there any another ways to find the "input locale" value in java.
There are 3 important locales in Windows: “Input Locale”, “User Locale” and “System Locale” and all 3 can be different.
That is you can have System Locale = English, Input Locale = Chinese and User Locale = Japanese
This might represent a Chinese user working in japan on an English PC.
In this example i want to identify Input Locale means "Chinese "
Thanks for your help.