How can I add highlighting to my simple text editor?

Question

Hi ...I wrote a simple text editor ..but I want to add Sysntax highlihting to my editor ...ilke I will enter some words in sourse code (new..import.. ext ) and when I write in text those words I want to see whit a different collor ..how can I do this? here is source codes for my text editor..and I want your help
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.plaf.ComponentUI;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.*;
import java.util.regex.*;
public class JText extends JFrame{
     private JTextArea textarea ;
     private JFileChooser fileChooser = new JFileChooser();
private Action open =new OpenAction() ;
private Action save = new SaveAction();
private Action exit = new ExitAction();
public static void main(String args[])
          JText pencere= new JText();
          pencere.setBackground(Color.lightGray);
          pencere.setSize(400,300);
          pencere.setVisible(true);
     //Text Area
     public JText(){
     textarea = new JTextArea(15,90) ;
     JScrollPane scroll = new JScrollPane(textarea);
     JPanel content = new JPanel();
content.setLayout(new BorderLayout());
content.add(scroll, BorderLayout.CENTER);
     //Menu Bar
JMenuBar menu=new JMenuBar();
JMenu file=menu.add(new JMenu("FILE"));
file.setMnemonic('F');
file.add(open);
file.add(save);
file.addSeparator();
file.add(exit);
setContentPane(content);
setJMenuBar(menu);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("Project");
pack();
setLocationRelativeTo(null);
setVisible(true);
     class OpenAction extends AbstractAction {
     //============================================= constructor
     public OpenAction() {
     super("Open...");
     putValue(MNEMONIC_KEY, new Integer('O'));
     //========================================= actionPerformed
     public void actionPerformed(ActionEvent e) {
     int retval = fileChooser.showOpenDialog(JText.this);
     if (retval == JFileChooser.APPROVE_OPTION) {
     File f = fileChooser.getSelectedFile();
     try {
     FileReader reader = new FileReader(f);
     textarea.read(reader, ""); // Use TextComponent read
     } catch (IOException ioex) {
     System.out.println(e);
     System.exit(1);
          class SaveAction extends AbstractAction {
          //============================================= constructor
          SaveAction() {
          super("Save...");
          putValue(MNEMONIC_KEY, new Integer('S'));
          //========================================= actionPerformed
          public void actionPerformed(ActionEvent e) {
          int retval = fileChooser.showSaveDialog(JText.this);
          if (retval == JFileChooser.APPROVE_OPTION) {
          File f = fileChooser.getSelectedFile();
          try {
          FileWriter writer = new FileWriter(f);
          textarea.write(writer); // Use TextComponent write
          } catch (IOException ioex) {
          JOptionPane.showMessageDialog(JText.this, ioex);
          System.exit(1);
               class ExitAction extends AbstractAction {
               //============================================= constructor
               public ExitAction() {
               super("Exit");
               putValue(MNEMONIC_KEY, new Integer('X'));
               //========================================= actionPerformed
               public void actionPerformed(ActionEvent e) {
               System.exit(0);
}

Answer 1

i looked it ...it is the one which i want to do ..But i want to use my window which i gave above ..But i cant mix them ..:( this codes for highlighting.... is any body can add this codes and my codes which i gave above connect together? pleaseeeee... :))
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
public class SyntaxTest extends DefaultStyledDocument
Element rootElement;
String wordSeparators = ",:;.()[]{}+-/*%=!&|~^@? ";
Vector keywords = new Vector();;
SimpleAttributeSet keyword;
public SyntaxTest()
rootElement= this.getDefaultRootElement();
keyword = new SimpleAttributeSet();
StyleConstants.setForeground(keyword, Color.blue);
keywords.add( "abstract" );
keywords.add( "boolean" );
keywords.add( "break" );
keywords.add( "byte" );
keywords.add( "case" );
keywords.add( "catch" );
keywords.add( "char" );
keywords.add( "class" );
keywords.add( "continue" );
keywords.add( "default" );
keywords.add( "do" );
keywords.add( "double" );
keywords.add( "else" );
keywords.add( "extends" );
keywords.add( "false" );
keywords.add( "final" );
keywords.add( "finally" );
keywords.add( "float" );
keywords.add( "for" );
keywords.add( "if" );
keywords.add( "implements" );
keywords.add( "import" );
keywords.add( "instanceof" );
keywords.add( "int" );
keywords.add( "interface" );
keywords.add( "long" );
keywords.add( "native" );
keywords.add( "new" );
keywords.add( "null" );
keywords.add( "package" );
keywords.add( "private" );
keywords.add( "protected" );
keywords.add( "public" );
keywords.add( "return" );
keywords.add( "short" );
keywords.add( "static" );
keywords.add( "super" );
keywords.add( "switch" );
keywords.add( "synchronized" );
keywords.add( "this" );
keywords.add( "throw" );
keywords.add( "throws" );
keywords.add( "true" );
keywords.add( "try" );
keywords.add( "void" );
keywords.add( "volatile" );
keywords.add( "while" );
public void insertString(int offset, String str, AttributeSet a) throws BadLocationException
super.insertString(offset, str, a);
int startOfLine = rootElement.getElement(rootElement.getElementIndex(offset)).getStartOffset();
int endOfLine = rootElement.getElement(rootElement.getElementIndex(offset+str.length())).getEndOffset() -1;
//highlight the changed line
highlightKeyword(this.getText(0,this.getLength()), startOfLine, endOfLine);
public void remove(int offset, int length) throws BadLocationException
super.remove(offset, length);
int startOfLine = rootElement.getElement(rootElement.getElementIndex(offset)).getStartOffset();
int endOfLine = rootElement.getElement(rootElement.getElementIndex(offset+length)).getEndOffset() -1;
//highlight the changed line
highlightKeyword(this.getText(0,this.getLength()), startOfLine, endOfLine);
public void highlightKeyword(String content,int startOffset, int endOffset)
char character;
int tokenEnd;
while (startOffset < endOffset)
tokenEnd = startOffset;
//find next wordSeparator
while(tokenEnd < endOffset)
character = content.charAt(tokenEnd);
if(wordSeparators.indexOf(character) > -1)
break;
else
tokenEnd++;
//check for keyword
String token = content.substring(startOffset,tokenEnd).trim();
if(keywords.contains(token))
this.setCharacterAttributes(startOffset, token.length(), keyword, true);
startOffset = tokenEnd+1;
public static void main(String[] args)
JFrame f = new JFrame();
JTextPane pane = new JTextPane(new SyntaxTest());
JScrollPane scrollPane = new JScrollPane(pane);
f.setContentPane(scrollPane);
f.setSize(600,400);
f.setVisible(true);
}