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.