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.
Java's String class is pretty easy to use. I think it's a well-designed class. I understand that String concatenation using + actually uses StringBuffer under the hood (so saith the J2SE 1.3 API spec). Other than that, what practical use is there for StringBuffer in real programs?