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java 8 lambda

1.  What is lambda ?
 * lambda is like a mathematics function f(x) = x +2, but it doesn't the name.
 * lambda in java is called function interface
 * lambda is anonymous interface and only one function

2. Lambda style

(input) -> {body}

3. example

Runnable runnbale = new Runnable() {
     public void run() {
      System.out.println("run me!");
     }
 }; 

Runnable runnbale = () -> System.out.println("run me!"); 

REF

Chinese: http://magiclen.org/java-8-lambda/

English more detail: more detail 

Explanation visual: visual

oracle function interface

oracle comsumer face

Authentication vs. Authorization

Authentication mean 

• Who is user ?
• And his password is hser?

Authorization mean

• Is the user can get the file?
• Is the user have write power?