Slides for a short lightning talk I gave at Near Infinity (www.nearinfinity.com) on what exactly is in JDK7.

1. wtf
is in Java/JDK/wtf 7 ???
Scott Leberknight

2. "Making Java suck (a little) less..."

3. jsr-203
(NIO.2)

4. // old way (deprecated)
File file = new File("foo.txt");
// new way
Path path = Paths.get("foo.txt");
Path path = file.toPath();
java.nio.file

5. Files
(finally, you can copy a file...only took ~15 years)
FileSystem(s)
FileStore

6. scalable, asynchronous I/O
(AsynchronousChannel & friends)
socket-channel binding
& config
(NetworkChannel & friends)

7. jsr-292
(invokedynamic)

8. invokedynamic
invokestatic invokespecial
invokevirtual invokeinterface
invokedynamic (new)
"...an invokedynamic instruction is used to call
methods which have linkage and dispatch
semantics defined by non-Java languages..."
- http://www.infoq.com/articles/invokedynamic

9. jsr-334
(Project Coin)

10. strings in switch
switch (action) {
case "Red": stop(); break;
case "Yellow": slowDown(); break;
case "Green": go(); break;
case "Blue": danceAJig(); break;
}

11. binary literals
int clutchSong = 0b10001110101;
http://www.amazon.com/Robot-Hive-Exodus-Clutch/dp/B0009NSE1K

12. short/byte literals
byte b = 42y;
short s = 32767s;

13. underscores in numeric literals
long max = 9_223_372_036_854_775_807L;
int song = 0b0100_0111_0101;

14. multi-catch
try {
// code...
}
catch (FileNotFoundException | NoSuchFileException |
AccessDeniedException ex) {
// handle...
}

15. final re-throw
try {
actionThatThrowsIOException();
actionThatThrowsSQLException();
}
catch (final Exception e) {
// handle...
throw e; // IOException or SQLException
}

16. ARM
(automatic
resource
management)
try (InputStream is = url.openStream();
OutputStream os = new FileOutputStream(file)) {
// use resources...
}
(AutoCloseable)

17. diamond operator
Map<String, Map<Integer, List<String>>> things =
new HashMap<>();

18. modified JSRs
Java Compiler API (jsr 199)
JAXP 1.3 (jsr 206)
JAXB 2.2 (jsr 222)
JAX-WS 2.2 (jsr 224)
Pluggable Annotation Processing (jsr 269)

19. honorable mention
java.util.Objects
jsr166y - Concurrency &
collections updates
Enhanced JMX agent and
MBeans
Autoloading of JDBC
drivers
Method to close a
URLClassLoader
JDBC 4.1

20. assembly-coding
Class Loader architecture updates (parallel-capable)
Strict class file checking
Elliptic curve cryptography (ECC)
New garbage collector (lower pause times & better
predictability than current CMS collector)

21. deferred
until JDK 8
(sometime next century)

22. Project Lambda
re d
r
(a.k.a. closures)
de fe Collection Literals
List<Integer> items = [1, 2, 3, 4, 5];
Modularity
(JSR 294 modules, formerly superpackages)

23. references
http://jdk7.java.net/
http://openjdk.java.net/projects/jdk7/features/
http://jdk7.java.net/preview/
http://download.java.net/jdk7/docs/api/
http://www.infoq.com/articles/invokedynamic
http://www.vineetmanohar.com/2011/03/installing-java-7-on-mac-os-x/
http://marxsoftware.blogspot.com/2011/03/jdk-7-new-interfaces-
classes-enums-and.html

24. (the end)
scott.leberknight@nearinfinity.com
www.nearinfinity.com/blogs/
twitter: sleberknight