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String fileName = "Hellow,How Are You!";		PushbackInputStream push = null;		ByteArrayInputStream bat = null;		bat = new ByteArrayInputStream(fileName.getBytes());		push = new PushbackInputStream(bat); //回退流		int temp = 0;		while ((temp = push.read()) != -1) {			if (temp == ',') {  //遇到逗号，在逗号前加（，boy）				push.unread(temp);				temp = push.read();				System.out.print(",boy" + (char)temp );			} else {				System.out.print( (char)temp); //正常打印流内容			}		}

打印如下：   Hellow,boy,How Are You!

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