StyledDocument: setCharacterAttributes(int offset, int length, AttributeSet s, boolean replace)
import javax.swing.JTextPane;
import javax.swing.text.StyledDocument;
public class Main {
public static void main(String[] argv) throws Exception {
JTextPane textPane = new JTextPane();
StyledDocument doc = textPane.getStyledDocument();
// Set text in the range [5, 7) red
doc.setCharacterAttributes(5, 2, textPane.getStyle("Red"), true);
}
}
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