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Java Versions (8 (functional interfaces (FunctionalInterface, java.util…

- - - - effectively final
  - - - java.util.Date
      - java.util.Calendar
      - java.util.Timezone
    - - Instant
      - LocalDate
      - LocalDateTime
      - ZonedDateTime
- - - - but not synchronised
  - - - public interface RequestForEnhancement {
        int id();
        String synopsis();
        String engineer() default "[unassigned]";
        String date() default "[unimplemented]"
        }
    - - to annotate declarations
      - special kind of modifier
      - RequestForEnhancement {
        id = 12345,
        synopsis = "Enable time travel",
        engineer = "Mr Peabody",
        date = "4/1/3007"
        }
        public static void travelThroughTime (Date destination) ...
- - - - provides an interactive tool
      - can evaluate java code
        
        without having to
        create a class
    - - Tools->JShell Console
- - - - "arrow case"
    - - may be in future release
        
        in a different format
        
        or not at all
      - to compile and run code containing preview features
        
        specify command-line options
- - - - which is the value that the case label produces in a switch expression
- - - - for local variables
      - with initialisers
      - cannot be used for
        
        locals without an intitialiser
        
        member varialbles
        
        method parameters
        
        return types
    - - String message = "Good bye, Java 9";
    - - var message = "Hello, Java 10"; assertTrue(message instanceof String);
    - - reduce boilerplate code
      - make declarations easier to read
    - - the type of the variable is determined at compile time and cannot be changed