jTextArea - problem with \u

[Velika Srbija]

I have HashTable containing Strings with unicode characters. When I try:
jTextArea1.setText(hash_table.get(hash_item).toString());
I get the correct result except it fails in parsing unicode marks.
Why???
But when I try:
jTextArea1.setText("example \u0394");
everything is OK

[Velika Srbija]

Is it to heavy for YOU???
Could someone answer???

[Nathan Pruett]

This simple example is working for me...

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.util.*;
 
public class UnicodeEdit extends JFrame {
    JTextArea ta;
    Hashtable hash;
 
    public UnicodeEdit() {
        hash = new Hashtable();
        hash.put( "String1", "example \u0394" );
        ta = new JTextArea();
        ta.setText( hash.get( "String1" ).toString() );
        getContentPane().add( ta, BorderLayout.CENTER );
        addWindowListener( new WindowAdapter() {
            public void windowClosing( WindowEvent e ) {
                System.exit( 0 );
            }
        } );
        setSize( 400, 400 );
        setVisible( true );
    }
 
    public static void main( String[] args ) {
        new UnicodeEdit();
    }
}

Does this example work for you?

I think your problem may be the way your data is being put into the hashtable. Maybe it's being added in as //u0394 and your program doesn't understand it's supposed to be parsed into a unicode character?

-Nate

[Velika Srbija]

Thanks anyway, but I've already tried that. My problem is a little bit different.
I have .txt file in Courier New (Western) font (-it's OK with Java) and I used:
BufferedReader b = new BufferedReader(new FileReader ("myFile.txt"));
classes in order to read whole lines of plain text that contains unicode \uXXXX
while (
...
hash_table.put(b.readLine(), b.readLine());
...
}
And everything compiles OK, run OK too, and when it comes to:
jTextArea1.setText(hash_table.get(some_hash_item));
I get the result, but the unicode mark isn't parsed. It is as it were in a text file. Here is an example of what I get in jTextArea field:

This is Greek symbol for micrometer \u03BC

As you can see there is no correct symbol.
Please try this and tell me what have you done.

[Velika Srbija]

Sorry I saw just after I had posted reply.
Casting is missing.
This is correct (like in my original application):
jTextArea1.setText((String)hash_table.get(some_hash_item));

[Nathan Pruett]

Hmmmm... this link might help you...

http://java.sun.com/docs/books/tutorial/i18n/text/convertintro.html

I *finally* got the sample code to actually work by doing adding a StringTokenizer to find Unicode values... Whenever a String is read from an external source, Java is smart enough to know to turn a "\" into a "\\"... since this is a special case, you have to add a StringTokenizer to check for UniCode codes...

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.util.*;
import java.io.*;
 
public class UnicodeEdit extends JFrame {
    JTextArea ta;
    Hashtable hash;
    String errorText;
 
    public UnicodeEdit() {
        hash = new Hashtable();
        try {
            FileInputStream fis = new FileInputStream( "myFile.txt" );
            InputStreamReader isr = new InputStreamReader( fis );
            BufferedReader b = new BufferedReader( isr );
            String key = b.readLine();
            //key = getUnicode( key );
            String val = b.readLine();
            val = getUnicode( val );
            hash.put( key, val );
        }
        catch ( FileNotFoundException x ) {
            errorText = "myFile.txt not found!";
            System.err.println( errorText );
        }
        catch ( IOException x ) {
            errorText = "Problem reading from file!";
            System.err.println( errorText );
            x.printStackTrace();
        }
        ta = new JTextArea();
        Object o = hash.get( "String1" );
        if ( o != null ) {
            ta.setText( o.toString() );
        }
        if ( errorText != null ) {
            ta.append( "\n" + errorText );
        }
        getContentPane().add( ta, BorderLayout.CENTER );
        addWindowListener( new WindowAdapter() {
            public void windowClosing( WindowEvent e ) {
                System.exit( 0 );
            }
        } );
        setSize( 400, 400 );
        setVisible( true );
    }
 
    public String getUnicode( final String s ) {
        StringBuffer buffer = new StringBuffer();
        StringTokenizer tok = new StringTokenizer( s, " \n\n\t\f", true );
        while( tok.hasMoreTokens() ) {
            String token = tok.nextToken();
            System.out.print( token + "|" );
            if ( token.startsWith( "\\u" ) ) {
                token = token.substring( 2 );
                int i = Integer.parseInt( token, 16 );
                char c = (char)i;
                buffer.append( String.valueOf( c ) );
            }
            else {
                buffer.append( token );
            }
        }
        return buffer.toString();
    }
 
    public static void main( String[] args ) {
        new UnicodeEdit();
    }
}

-Nate

[Velika Srbija]

Thanks man.
It works good.
You are the best one.
Duke dollars for you.