Java by API/javax.swing.text/DefaultStyledDocument

DefaultStyledDocument: insertString(int offset, String str, AttributeSet a)

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;
import javax.swing.text.TabSet;
import javax.swing.text.TabStop;
public class MainClass {
  public static void main(final String args[]) {
    JFrame frame = new JFrame("Tab Attributes");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    StyledDocument document = new DefaultStyledDocument();
    int positions[] = { TabStop.ALIGN_BAR, TabStop.ALIGN_CENTER, TabStop.ALIGN_DECIMAL,
        TabStop.ALIGN_LEFT, TabStop.ALIGN_RIGHT };
    String strings[] = { "\tTabStop.ALIGN_BAR\n", "\tTabStop.ALIGN_CENTER\n",
        "\tTabStop.ALIGN_DECIMAL\n", "\tTabStop.ALIGN_LEFT\n", "\tTabStop.ALIGN_RIGHT\n" };
    SimpleAttributeSet attributes = new SimpleAttributeSet();
    for (int i = 0, n = positions.length; i < n; i++) {
      TabStop tabstop = new TabStop(150, positions[i], TabStop.LEAD_DOTS);
      try {
        int position = document.getLength();
        document.insertString(position, strings[i], null);
        TabSet tabset = new TabSet(new TabStop[] { tabstop });
        StyleConstants.setTabSet(attributes, tabset);
        document.setParagraphAttributes(position, 1, attributes, false);
      } catch (BadLocationException badLocationException) {
        System.err.println("Bad Location");
      }
    }
    JTextPane textPane = new JTextPane(document);
    textPane.setEditable(false);
    JScrollPane scrollPane = new JScrollPane(textPane);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);
  }
}

new DefaultStyledDocument(StyleContext styles)

import java.awt.BorderLayout;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.Style;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;
import javax.swing.text.StyledDocument;
public class MainClass {
  public static void main(String args[]) throws Exception {
    JFrame frame = new JFrame("TextPane Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    StyleContext context = new StyleContext();
    StyledDocument document = new DefaultStyledDocument(context);
    Style style = context.getStyle(StyleContext.DEFAULT_STYLE);
    StyleConstants.setAlignment(style, StyleConstants.ALIGN_RIGHT);
    StyleConstants.setFontSize(style, 14);
    StyleConstants.setSpaceAbove(style, 4);
    StyleConstants.setSpaceBelow(style, 4);
    SimpleAttributeSet attributes = new SimpleAttributeSet();
    StyleConstants.setBold(attributes, true);
    StyleConstants.setItalic(attributes, true);
    // Third style for icon/component
    Style labelStyle = context.getStyle(StyleContext.DEFAULT_STYLE);
    Icon icon = new ImageIcon("Computer.gif");
    JLabel label = new JLabel(icon);
    StyleConstants.setComponent(labelStyle, label);
    try {
      document.insertString(document.getLength(), "Hello www.jexp.ru", attributes);
      document.insertString(document.getLength(), "Ignored", labelStyle);
    } catch (BadLocationException badLocationException) {
      System.err.println("Oops");
    }
    JTextPane textPane = new JTextPane(document);
    textPane.setEditable(false);
    JScrollPane scrollPane = new JScrollPane(textPane);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);
  }
}