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![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)](https://image.slidesharecdn.com/wtf-jdk7-110416100253-phpapp02/85/wtf-is-in-Java-JDK-wtf7-22-320.jpg)
![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)](https://image.slidesharecdn.com/wtf-jdk7-110416100253-phpapp02/75/wtf-is-in-Java-JDK-wtf7-22-2048.jpg)
Uploaded byScott Leberknight
wtf is in Java/JDK/wtf7?
The document discusses the features and improvements introduced in Java 7, including enhancements in file handling with NIO.2, the introduction of invokedynamic for method calls from non-Java languages, and new syntax features such as string switch statements and binary literals. It also highlights updates to concurrency and collections, automatic resource management, and the introduction of new garbage collection methods. Additionally, the document references various JSRS related to these features and provides links for further reading.
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wtf is in Java/JDK/wtf7?
- 1. wtf is inJava/JDK/wtf 7 ??? Scott Leberknight
- 2. "Making Java suck(a little) less..."
- 3.
- 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 cancopy a file...only took ~15 years) FileSystem(s) FileStore
- 6. scalable, asynchronous I/O (AsynchronousChannel & friends) socket-channel binding & config (NetworkChannel & friends)
- 7.
- 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.
- 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 numericliterals 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 CompilerAPI (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 architectureupdates (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.
- 24.