Clarify CommandLineRunner in Application.java about tut-rest HOT 2 CLOSED

If you look at http://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/CommandLineRunner.html#run(java.lang.String...), you'll see that this interface has a single method that accepts an array of strings. The tutorial's Application class takes advantage of Java 8's ability to coerve a lambda function call into a CommandLineRunner. As the paragraph right below the code states, Spring Boot will run any and all CommandLineRunners after the application context is created. If you look on YouTube for one of Josh Long's (the author of this tutorial) videos on "Bootiful Apps", you'll see him illustrate this same concept.

from tut-rest.

Yes, i got it at last. It is about the functional Interface and lambda expression of Java8. First, we should known what is functional interface, then we will learn how lambda expressiom implements the funcitonal interface. "CommandLineRunner" interface is a functional interface, then we use lambda expression to implements it.

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