wtf is in Java/JDK/wtf7?

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

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

jsr-203(NIO.2)

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

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

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

jsr-292(invokedynamic)

invokedynamicinvokestatic invokespecialinvokevirtual invokeinterfaceinvokedynamic (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

jsr-334 (Project Coin)

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

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

short/byte literalsbyte b = 42y;short s = 32767s;

underscores in numeric literalslong max = 9_223_372_036_854_775_807L;int song = 0b0100_0111_0101;

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

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

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

diamond operatorMap<String, Map<Integer, List<String>>> things = new HashMap<>();

modiﬁed JSRsJava 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)

honorable mentionjava.util.Objects jsr166y - Concurrency & collections updatesEnhanced JMX agent andMBeans Autoloading of JDBC driversMethod to close aURLClassLoader JDBC 4.1

assembly-codingClass Loader architecture updates (parallel-capable)Strict class ﬁle checkingElliptic curve cryptography (ECC)New garbage collector (lower pause times & betterpredictability than current CMS collector)

deferred until JDK 8 (sometime next century)

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)

referenceshttp://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/invokedynamichttp://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

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

wtf is in Java/JDK/wtf7?

by Scott Leberknight

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