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Код



package jte;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.Action;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.*;

public class JTEFrame extends javax.swing.JFrame {

    /** Creates new form JTEFrame */
    public JTEFrame() {
        initComponents();
      //  jEditorPane1.setEditorKit(EKit);
        jEditorPane1.setDocument(doc);
        doc.addDocumentListener( new DocLis());
      
    }
  
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        jEditorPane1 = new javax.swing.JEditorPane();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jScrollPane1.setViewportView(jEditorPane1);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 300, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>

    /**
    * @param args the command line arguments
    */
 
public void doit(){
System.out.println(EKit.getContentType());

}

    // Variables declaration - do not modify
    public static javax.swing.JEditorPane jEditorPane1;
    private javax.swing.JScrollPane jScrollPane1;
    // End of variables declaration
    public static  PlainDocument doc = new PlainDocument();
    public StyledEditorKit EKit = new StyledEditorKit();
     Document d = EKit.createDefaultDocument();
}


class DocLis implements DocumentListener {

    public void insertUpdate(DocumentEvent e) {
     
    }

    public void removeUpdate(DocumentEvent e) {
    
    
    }

    public void changedUpdate(DocumentEvent e) {
      
      
    }


}