In many languages you can take a dynamically created String such as 6*(4+6^2)-cos(20) and ask to have it evaluated, as if it were a miniature computer
program. The function to do this often has a name such as eval. Java has no such
function. What can you do? Here are six different approaches:
Compose a miniature Java program on the fly, one complete *.java file and invoke
sun.tools.javac.Main instead of execing javac.exe. Use
Class.forName or reflection on to then execute the dynamically compiled method.
Similar to the method above, but directly generate some byte codes for a miniature class.