Minecraft Language Reverser Hebrew m1o2 fxp

import java.awt.Toolkit;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.regex.Pattern;

import javax.swing.JOptionPane;
import javax.swing.UIManager;

public class Maic {

    private static final String DEFAULT_SOURCE = "he_IL.lang";
    private static final String DEFAULT_DESTINATION = "he_IL.lang(Reversed)";

    public static void main(String[] args) {

        String sourcePath = ( args.length < 1 ? DEFAULT_SOURCE : args[0] );
        String destinationPath = ( args.length < 2 ? DEFAULT_DESTINATION : args[1] );


        StringBuilder builder = new StringBuilder();

        try( PrintWriter writer = new PrintWriter( destinationPath, "UTF-8"); BufferedReader reader = new BufferedReader( new InputStreamReader( new FileInputStream(sourcePath ), "UTF-8") ) ) {

            UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName() );


            String line = "";

            //for( int index = 0;  null != ( line = reader.readLine() ); ++index ){
            while( null != ( line = reader.readLine() ) ){

                String[] tokens = line.split("=");

                builder.append( tokens[ 0 ] );
                builder.append( '=' );


                if( tokens.length > 1 ){

                    //Pattern p = Pattern.compile( "[^a-z0-9\\.]", Pattern.CASE_INSENSITIVE );
                    Pattern p = Pattern.compile( "\\W+" );
                    if( true == p.matcher( tokens[ 1 ] ).find() )
                        builder.append( reverse( tokens[ 1 ] ) );
                    else
                        builder.append( tokens[ 1 ] );
                }

                builder.append( "\r\n" );
            }

            writer.print( builder.toString() );

        } catch (Exception e) {

            Toolkit.getDefaultToolkit().beep();
            JOptionPane.showMessageDialog( null, "Problem : " + e.getMessage(), "Contact m1o2", JOptionPane.ERROR_MESSAGE );
            System.exit(1);
        }


        Toolkit.getDefaultToolkit().beep();
        JOptionPane.showMessageDialog( null, "File Created Successfully!", "Created By m1o2", JOptionPane.INFORMATION_MESSAGE );
    }

    private static String reverse( String str ){

        StringBuilder builder = new StringBuilder();

        for( int index = 0; index < str.length(); ++index )
            builder.insert( 0, str.charAt(index) );

        return builder.toString();
    }
}