如何复制特定字符的IText样式

import com.itextpdf.text.*;
import com.itextpdf.text.pdf.PdfWriter;

public class CopyTextStyleExample {
    public static void main(String[] args) {
        try {
            // 创建文档对象
            Document document = new Document();
            PdfWriter.getInstance(document, new FileOutputStream("output.pdf"));

            // 打开文档
            document.open();

            // 添加文本到文档
            Chunk chunk1 = new Chunk("Hello, World!", new Font(Font.FontFamily.TIMES_ROMAN, 12, Font.BOLD));
            Chunk chunk2 = new Chunk("World", new Font(Font.FontFamily.HELVETICA, 10, Font.ITALIC));
            Chunk chunk3 = new Chunk("!");
            Paragraph paragraph = new Paragraph();
            paragraph.add(chunk1);
            paragraph.add(chunk2);
            paragraph.add(chunk3);
            document.add(paragraph);

            // 复制chunk1的样式到chunk3
            chunk3.setFont(chunk1.getFont());
            chunk3.setFontSize(chunk1.getFontSize());
            chunk3.setFontColor(chunk1.getFont().getColor());

            // 关闭文档
            document.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}