This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Am I correct in thinking this is because internally a StringBuffer is used in all cases and stringBuffer.append(null) just adds the text null. Anyway I thought it was interesting because I was expecting a nullpointer to be thrown and it was not.