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Java7



                2011/7/7



   Copyright(c) Yusuke Yamamoto All rights reserved.
@yusukey -
• Java JavaEE
• Twitter4J ”    ”

  http://samuraism.jp/




• Twitter API
• 7 15
                 Copyright(c) Yusuke Yamamoto All rights reserved.
Java7                          Project Coin


•       Java1.4.2

•                              Java5

•                                                    Java1.4.2+



Java1.4.2 / Java5


           Copyright(c) Yusuke Yamamoto All rights reserved.
Java7(or Java6)
                               (            )


Copyright(c) Yusuke Yamamoto All rights reserved.
613

978

                                                     1688
      Copyright(c) Yusuke Yamamoto All rights reserved.
Java5
2009    10          31
                                                             613

978

                                                        1688
         Copyright(c) Yusuke Yamamoto All rights reserved.
Java5
2009    10          31
                                                             613
             Java1.4.2
978          2008                     10               31


                                                        1688
         Copyright(c) Yusuke Yamamoto All rights reserved.
Java5
2009    10          31
                                                             613
             Java1.4.2
978          2008                     10               31

Java6
2006    12          11
                                                        1688
         Copyright(c) Yusuke Yamamoto All rights reserved.
Copyright(c) Yusuke Yamamoto All rights reserved.
Java6



        Copyright(c) Yusuke Yamamoto All rights reserved.
Java for Business


  Java6                 1.6.0_26                                  1.6.0_26

  Java5                 1.5.0_22                                  1.5.0_30

Java1.4.2               1.4.2_19                                  1.4.2_32


http://www.oracle.com/technetwork/java/javase/6u26releasenotes-401875.html


                   Copyright(c) Yusuke Yamamoto All rights reserved.
Copyright(c) Yusuke Yamamoto All rights reserved.
Java1.4.2           Java5




            Copyright(c) Yusuke Yamamoto All rights reserved.
Java5 7

•   Java5   annotation, enum, generics,                              for ,
                               , Auto(un)boxing

• Java6                                               @Override,
            @Generated

• Java7     String-switch,
                                                 ,
            try-with-resources


                 Copyright(c) Yusuke Yamamoto All rights reserved.
Copyright(c) Yusuke Yamamoto All rights reserved.
Java6 Java7




  Copyright(c) Yusuke Yamamoto All rights reserved.
Copyright(c) Yusuke Yamamoto All rights reserved.
Java7                           Java6


$ java -version
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03-384-10M3425)
Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02-384, mixed mode)
$ java -cp classes/ Java7Grammar
Exception in thread "main" java.lang.UnsupportedClassVersionError:
Java7Grammar : Unsupported major.minor version 51.0
   at java.lang.ClassLoader.defineClass1(Native Method)
   at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)




                    Copyright(c) Yusuke Yamamoto All rights reserved.
Java7                        Java6

    Unsupported major.minor version 51.0


             major version
(                                          7,8                       )
48(0x30): Java1.4
49(0x31): Java5
50(0x32): Java6
51(0x33): Java7                                      minor               major

                 Copyright(c) Yusuke Yamamoto All rights reserved.
Copyright(c) Yusuke Yamamoto All rights reserved.
Java6


        $ javac -target 1.4 Java7Grammar.java
        javac: source release 1.7 requires target
        release 1.7




✔   $ javac -target jsr14 Java7Grammar.java


         Java1.4.2+



              Copyright(c) Yusuke Yamamoto All rights reserved.
-target jsr14
                         enum               generics                        for                autoboxing


1.4.2                                             ✔                   ✔              ✔            ✔
  5         ✔               ✔                     ✔                   ✔              ✔            ✔
  6         ✔               ✔                     ✔                   ✔              ✔            ✔

        String-switch                                                  <>          try-with
                                                                                  -resources

1.4.2       ✔               ✔                                         ✔
  5         ✔               ✔                                         ✔
  6         ✔               ✔                                         ✔
                        Copyright(c) Yusuke Yamamoto All rights reserved.
-target jsr14
                         enum               generics                        for                autoboxing


1.4.2                                             ✔                   ✔              ✔            ✔
  5         ✔               ✔                     ✔                   ✔              ✔            ✔
  6         ✔               ✔                     ✔                   ✔              ✔            ✔

        String-switch                                                  <>          try-with
                                                                                  -resources

1.4.2       ✔               ✔                                         ✔
  5         ✔               ✔                                         ✔
  6         ✔               ✔                                         ✔
                        Copyright(c) Yusuke Yamamoto All rights reserved.
Java1.4.2
                                                     enum
                1.4.2
•   StringBuilder                   (API                                )
     ‣ +                                                                StringBuilder
                                  -target jsr14                                 StringBuffer


•   enum

•
     ‣                                                                            @Override

                    Copyright(c) Yusuke Yamamoto All rights reserved.
1.4.2
                              5
                              6
  •
        } catch (NoSuchMethodException | ClassNotFoundException) {
            e.printStackTrace();
            throw e;



Exception in thread "main" java.lang.NoClassDefFoundError: java/
lang/ReflectiveOperationException
Caused by: java.lang.ClassNotFoundException:
java.lang.ReflectiveOperationException

                           Copyright(c) Yusuke Yamamoto All rights reserved.
•                    API


    ‣       String#contains()




        Copyright(c) Yusuke Yamamoto All rights reserved.
• Java7            (                        )Java1.4.2                6

• Coin
•                                              Java6

          maven

  https://github.com/yusuke/java7grammar
Twitter4J -target jsr14

  https://github.com/yusuke/twitter4j
                  Copyright(c) Yusuke Yamamoto All rights reserved.
Java7




   Copyright(c) Yusuke Yamamoto All rights reserved.

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Java7シンタックスで レガシーコードを快適メンテナンス

  • 1. Java7 2011/7/7 Copyright(c) Yusuke Yamamoto All rights reserved.
  • 2. @yusukey - • Java JavaEE • Twitter4J ” ” http://samuraism.jp/ • Twitter API • 7 15 Copyright(c) Yusuke Yamamoto All rights reserved.
  • 3. Java7 Project Coin • Java1.4.2 • Java5 • Java1.4.2+ Java1.4.2 / Java5 Copyright(c) Yusuke Yamamoto All rights reserved.
  • 4. Java7(or Java6) ( ) Copyright(c) Yusuke Yamamoto All rights reserved.
  • 5. 613 978 1688 Copyright(c) Yusuke Yamamoto All rights reserved.
  • 6. Java5 2009 10 31 613 978 1688 Copyright(c) Yusuke Yamamoto All rights reserved.
  • 7. Java5 2009 10 31 613 Java1.4.2 978 2008 10 31 1688 Copyright(c) Yusuke Yamamoto All rights reserved.
  • 8. Java5 2009 10 31 613 Java1.4.2 978 2008 10 31 Java6 2006 12 11 1688 Copyright(c) Yusuke Yamamoto All rights reserved.
  • 9. Copyright(c) Yusuke Yamamoto All rights reserved.
  • 10. Java6 Copyright(c) Yusuke Yamamoto All rights reserved.
  • 11. Java for Business Java6 1.6.0_26 1.6.0_26 Java5 1.5.0_22 1.5.0_30 Java1.4.2 1.4.2_19 1.4.2_32 http://www.oracle.com/technetwork/java/javase/6u26releasenotes-401875.html Copyright(c) Yusuke Yamamoto All rights reserved.
  • 12. Copyright(c) Yusuke Yamamoto All rights reserved.
  • 13. Java1.4.2 Java5 Copyright(c) Yusuke Yamamoto All rights reserved.
  • 14. Java5 7 • Java5 annotation, enum, generics, for , , Auto(un)boxing • Java6 @Override, @Generated • Java7 String-switch, , try-with-resources Copyright(c) Yusuke Yamamoto All rights reserved.
  • 15. Copyright(c) Yusuke Yamamoto All rights reserved.
  • 16. Java6 Java7 Copyright(c) Yusuke Yamamoto All rights reserved.
  • 17. Copyright(c) Yusuke Yamamoto All rights reserved.
  • 18. Java7 Java6 $ java -version java version "1.6.0_26" Java(TM) SE Runtime Environment (build 1.6.0_26-b03-384-10M3425) Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02-384, mixed mode) $ java -cp classes/ Java7Grammar Exception in thread "main" java.lang.UnsupportedClassVersionError: Java7Grammar : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) Copyright(c) Yusuke Yamamoto All rights reserved.
  • 19. Java7 Java6 Unsupported major.minor version 51.0 major version ( 7,8 ) 48(0x30): Java1.4 49(0x31): Java5 50(0x32): Java6 51(0x33): Java7 minor major Copyright(c) Yusuke Yamamoto All rights reserved.
  • 20. Copyright(c) Yusuke Yamamoto All rights reserved.
  • 21. Java6 $ javac -target 1.4 Java7Grammar.java javac: source release 1.7 requires target release 1.7 ✔ $ javac -target jsr14 Java7Grammar.java Java1.4.2+ Copyright(c) Yusuke Yamamoto All rights reserved.
  • 22. -target jsr14 enum generics for autoboxing 1.4.2 ✔ ✔ ✔ ✔ 5 ✔ ✔ ✔ ✔ ✔ ✔ 6 ✔ ✔ ✔ ✔ ✔ ✔ String-switch <> try-with -resources 1.4.2 ✔ ✔ ✔ 5 ✔ ✔ ✔ 6 ✔ ✔ ✔ Copyright(c) Yusuke Yamamoto All rights reserved.
  • 23. -target jsr14 enum generics for autoboxing 1.4.2 ✔ ✔ ✔ ✔ 5 ✔ ✔ ✔ ✔ ✔ ✔ 6 ✔ ✔ ✔ ✔ ✔ ✔ String-switch <> try-with -resources 1.4.2 ✔ ✔ ✔ 5 ✔ ✔ ✔ 6 ✔ ✔ ✔ Copyright(c) Yusuke Yamamoto All rights reserved.
  • 24. Java1.4.2 enum 1.4.2 • StringBuilder (API ) ‣ + StringBuilder -target jsr14 StringBuffer • enum • ‣ @Override Copyright(c) Yusuke Yamamoto All rights reserved.
  • 25. 1.4.2 5 6 •         } catch (NoSuchMethodException | ClassNotFoundException) { e.printStackTrace(); throw e; Exception in thread "main" java.lang.NoClassDefFoundError: java/ lang/ReflectiveOperationException Caused by: java.lang.ClassNotFoundException: java.lang.ReflectiveOperationException Copyright(c) Yusuke Yamamoto All rights reserved.
  • 26. API ‣ String#contains() Copyright(c) Yusuke Yamamoto All rights reserved.
  • 27. • Java7 ( )Java1.4.2 6 • Coin • Java6 maven https://github.com/yusuke/java7grammar Twitter4J -target jsr14 https://github.com/yusuke/twitter4j Copyright(c) Yusuke Yamamoto All rights reserved.
  • 28. Java7 Copyright(c) Yusuke Yamamoto All rights reserved.