Command Line Single Quotes & Sayings

Inheriting from Application is shorter than writing an explicit main method, but it also has some shortcomings. First, you can't use this trait if you need to access command-line arguments, because the args array isn't available. For example, because the Summer application uses command-line arguments, it must be written with an explicit main method, as shown in Listing 4.3. Second, because of some restrictions in the JVM threading model, you need an explicit main method if your program is multi-threaded. Finally, some implementations of the JVM do not optimize the initialization code of an object which is executed by the Application trait. So you should inherit from Application only when your program is relatively simple and single-threaded. — Martin Odersky

The man who could withstand, with his fellow-men in single line, a charge of cavalry may lose all command of himself on the occurrence of a fire in his own house, because of some homely reminiscence unknown to the observing bystander. — Arthur Helps