首先：您使用的是过时的iText版本。请升级！

至于你的问题：段落包含一系列 Chunk 对象。 块是文本的原子部分，其中所有字形都是相同的字体，具有相同的字体大小，颜色等...

As for your question: a Paragraph consists of a series of Chunk objects. A Chunk is an atomic part of text in which all the glyphs are in the same font, have the same font size, color, etc...

因此，您需要将 String 拆分为两部分：

Hence you need to split your String in two parts:

Font dataGreenFont = FontFactory.getFont("Garamond", 10, BaseColor.GREEN);
Font dataBlackFont = FontFactory.getFont("Garamond", 10, BaseColor.BLACK);
Paragraph p = new Paragraph();
p.Add(new Chunk("Developed By : ", dataGreenFont));
p.Add(new Chunk("Mr.XXXXX", dataBlackFont));
document.add(p);