Live coding java 8 urs peter

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  • 1. Live  Coding:       By  Urs  Peter   upeter@xebia.com   @urs_peter      
  • 2. New  Features  of  Java  8   •  JSR  335  Lambda  Expressions  and  Virtual  Extension   Methods   •  JSR  308  AnnotaJons  on  Java  Types   Map<@NonNull String, @NonEmpty List<@Readonly Document>> files;! •  JSR  310  Date  and  Time  API   OffsetDateTime now = OffsetDateTime.now(); System.out.println(now.format(DateTimeFormatter.ISO_DATE));!
  • 3. New  Features  of  Java  8   •  JSR  335  Lambda  Expressions  and  Virtual  Extension   Methods   •  JSR  308  AnnotaJons  on  Java  Types   Map<@NonNull String, @NonEmpty List<@Readonly Document>> files;! •  JSR  310  Date  and  Time  API   OffsetDateTime now = OffsetDateTime.now(); System.out.println(now.format(DateTimeFormatter.ISO_DATE));!
  • 4. New  Features  of  Java  8   •  JSR  335  Lambda  Expressions  and  Virtual  Extension   Methods   FuncAonal   MulAple   •  JSR  308  AnnotaJons  on  Java  Types   Programming   Inheritance  of   Map<@NonNull String, @NonEmpty List<@Readonly Document>> files;! Behaviour   •  JSR  310  Date  and  Time  API   OffsetDateTime now = OffsetDateTime.now(); System.out.println(now.format(DateTimeFormatter.ISO_DATE));!
  • 5. Let’s  Dive  into  Java  8!  
  • 6. What  will  change  for  you?   FuncJonal  programming     becomes  mainstream!  
  • 7. How  to  get  funcJonal   •  Change  the  way  you  look  at  programming  logic:   –  Think  in  terms  of  transforming  data  or  input/output     …instead  manipulaJng  state   –  Make  immutable  programming  the  default,  mutable   programming  the  excepJon   –  FuncJonal  programming  implies  programming  on  a  higher   abstracAon  level    
  • 8. How  to  get  funcJonal   •  Start  using  higher  order  funcJons  (filter(), in  CollecJons/Streams   map() –  Whenever  you  use  a  for loop  try  to  come  up  with  a   funcJonal  alternaJve   •  Use  Lambda’s  in  your  own  so]ware  structures   –  E.g.  Use  Lambda’s  instead  of  a  Template  or  Strategy   pa^ern   •  Learn  to  read  Javadoc  for  Lambda’s   etc.)  
  • 9. When  to  apply     Virtual  Extension  Methods     •  Use  Virtual  Extension  Methods  to  make  new  addiJons  to  your   API  backwards  compaJble     •  Add  useful  default  implementaJons  to  your  interfaces   –  E.g.  Comparator:  boolean gt(T other), boolean lt(T other)! •  Bundle  cross-­‐cuang  behaviour  in  interfaces  with  default   methods   –  E.g.  Logging  
  • 10. Q  &  A     Urs  Peter   upeter@xebia.com   @urs_peter