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Problem 1: BY using defaulthighlighter, I can make the focused lines change to blue. Now I want to change it to other colors. Do anyone know how to change this parameter? --- solved Problem 2: pos is the beginning index of my substring which I want to highlight. I use setCaretPosition(pos); to update the showing content. But it always appears at the bottom of the window. I want to have it at the top. Could anyone tell me how to deal with that? I use one demo to show my problem: import java.awt.Color; import java.net.MalformedURLException; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.SwingUtilities; import javax.swing.text.BadLocationException; import javax.swing.text.DefaultHighlighter; public class Test { public static void main(final String[] args) throws MalformedURLException { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { try { init(); } catch (BadLocationException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); } private static void init() throws BadLocationException { JFrame frame = new JFrame(); final JTextArea textArea = new JTextArea(); JScrollPane pane = new JScrollPane(textArea); textArea.setText("Something. Something else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Samething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Sbmething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nB

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