Bitte schauen Sie sich den folgenden Code an

import java.awt.Color;  
import java.awt.Dimension;  
import java.awt.EventQueue;  
import java.awt.FlowLayout;  
import java.util.ArrayList;  
import java.util.Scanner;  
import javax.swing.*;  
import javax.swing.event.DocumentEvent;  
import javax.swing.event.DocumentListener;  
import javax.swing.text.BadLocationException;  
import javax.swing.text.Style;  
import javax.swing.text.StyleConstants;  
import javax.swing.text.StyledDocument;  

public class Form extends JFrame  
{  
    private JTextPane textPane;  
    private JLabel results;  
    private JPanel center,south;  
    private FlowLayout flow;  
    private ArrayList array;  
    private Color color;  
    private StyledDocument doc;  
    private Style style, fontSize;  



    public Form()  
    {  
        textPane = new JTextPane();  
        textPane.setMinimumSize(new Dimension(100,100));  

        doc = textPane.getStyledDocument();  
        doc.addDocumentListener(new TextActions());  


        results = new JLabel("Number of letters: ");  

        array = new ArrayList();   
        array.add("public");
        array.add("static");
        array.add("void");
        array.add("private");
        array.add("protected");

        color = new Color(185,224,247);  

        //Adding styles  
        style = doc.addStyle("blue", null);    
        StyleConstants.setForeground(style, color);    


         fontSize = doc.addStyle("fontSize", null);
         StyleConstants.setFontSize(fontSize, 25);


         //Setting the font Size
         doc.setCharacterAttributes(0, doc.getLength(), fontSize, false);

        center = new JPanel();  
        flow = new FlowLayout();  

        center.setLayout(flow);  
        center.add(textPane);  

        south = new JPanel();  
        south.setLayout(new FlowLayout());  
        south.add(results);  

        getContentPane().add(textPane,"Center");  
        getContentPane().add(south,"South");  



    }  

    private class TextActions implements DocumentListener   
    {  
        @Override  
        public void insertUpdate(DocumentEvent e)   
        {  
            try {  
                highlighat();  
            } catch (BadLocationException ex) {  
               ex.printStackTrace();  
            } 
        }  

        @Override  
        public void removeUpdate(DocumentEvent e)  
        {  
            try {  
                highlighat();  
            } catch (BadLocationException ex) {  
               ex.printStackTrace();  
            }  
        }  

        @Override  
        public void changedUpdate(DocumentEvent e)  
        {  

        }  

    }  

      private void highlighat()  throws BadLocationException  
     {    

        EventQueue.invokeLater(new Runnable()    
        {    
            public void run()    
            {    
                String text = "";  
                String content = null;  
                try {  
                    content = doc.getText(0, doc.getLength()).toLowerCase();  
                } catch (BadLocationException ex) {  
                    ex.printStackTrace();  
                }  
            int last=0;  

            for(int i=0;i<array.size();i++)  
            {  
               text = array.get(i).toString();  

               if(content.contains(text))  
               {  
                    while((last=content.indexOf(text,last))!=-1)  
                    {                     

                       int end = last+text.length();  

                       doc.setCharacterAttributes(last, end, textPane.getStyle("blue"), true);    

                       last++;  

                     }  

               }  
            }  
            }    
        }  
     );  
    }  

    public static void main(String[]args)  
    {  
        try  
        {  
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());  
        }  
        catch(Exception e)  
        {  

        }  
        Form f = new Form();  
        f.setVisible(true);  
        f.setSize(800,600);  

        f.validate();  
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
    }  
}  

Dort versuche ich auch, die Schriftgröße auf 25 einzustellen, aber wie Sie sehen, funktioniert es nicht. "textPane.setFont ()" funktionierte ebenfalls nicht. Wie kann ich die Schriftgröße richtig einstellen? Bitte helfen Sie ..