This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Even thought == on strings could theoretically work, you better use .equals on them, so instead of doing this.getS()==(((WrapStr)o).getS()) do this.getS().equals((((WrapStr)o).getS())). This approach is safer and not JVM-dependent