switch on String
Before JDK 7, only integral types can be used as selector for switch-case statement. In JDK 7, you can use a String object as the selector. For example,
http://www3.ntu.edu.sg/home/ehchua/programming/java/JDK7_NewFeatures.html
http://www.eweek.com/c/a/Application-Development/Oracle-and-Java-7-The-Top-10-Developer-Features-626145/
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