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To Java SE 8, and Beyond(Plan B)

Francisco Morero PeyronaEMEA Java Community Leader

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...201

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Priorities "or t#e Java Plat"or$s

%ro& 'evelo er Base

%ro& do tion

Increase *o$ etitiveness

da t to c#an+e

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Evolvin+ t#e an+ua+eFrom Evolving the Java Language - JavaOne 2005

Java language principles Reading is more important than writing Code should e a !oy to read "he language should not hide what is happening

Code should do what it seems to do Every #good$ %eature adds more # ad$ weight &ometimes it is est to leave things out &implicity matters

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Ho& Java Evolves and da ts'% the community( y the community( %or the commun

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8

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J'/ 8 0 Pro osed *ontent

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Language

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Bi+ 'isclai$er

"he synta) used in the%ollowing slides may

change

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a$2da E3 ressions IClosures and Functional Programming

* Lam da e)pressions provide anonymous %unction types to Java* "hey replace the use o% single a stract method types +&AM,* "hey are !ust instances o% Runna le

Argument List Arrow "o-en .ody

+int )( int y, /0 ) 1 y

Synta3

+a, A single e)pression2 ody is evaluated and result value returned3

+ , &tatement loc-2 ody is evaluated as a method ody and #return$ statementreturns control to the caller3

.ody can e2

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a$2da E3 ressions IIClosures and Functional Programming

Runnable r = () -> { System.out.println( "I'm a Runnable!" ); };

r.run();

jbutton.addActionListener( e -> { System.out.println( "Clicked" ); } );

* n -> n % 2 != 0;* (char c) -> c == 'y';

* (x, y) -> x + y;

* (int a, int b) -> a * a + b * b;

* () -> { return 3.14 };

* (String s) ->

{ System.out.println(s); };

* "ype o% parameters can e e)plicitly declared or ta-en %rom conte)t3* Argument parenthesis are optional when there is only one and its type

can e in%erred3* Argument List can e empty( i% it is so( parenthesis must e)ist3* 4% ody has more that one statement( then curly races are needed3

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a$2da E3 ressions IIIClosures and Functional Programming

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E3tension 4et#ods.ringing Multiple 4nheritance to Java

* Provide a mechanism to add new methods to e)isting inter%aces

* 5ithout rea-ing ac-wards compata ility* 6ives Java multiple inheritance

u2lic inter"ace Set e3tends *ollection5 u2lic int si6e()7

999 T#e rest o" t#e e3istin+ Set $et#ods

u2lic T reduce( :educer r ) de"ault *ollections9set:educ;

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nnotations on Java Ty es

public void process(@notnull List data) {}

* Annotations can currently only e used on type declarations

* Classes( methods( varia le de%initions* E)tension %or places where types are used

* e3g3 Parameters

* Permits error detection y plugga le type chec-ers

* e3g3 null pointer errors( race conditions( etc

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ccess to Para$eter a$es at :unti$e

* Mechanism to retrieve parameter names o% methods andconstructors

* At runtime via core re%lection

* 4mproved code reada ility* Eliminate redundant annotations

* 4mprove 47E capa ilities* Auto/generate template code

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S$all T#in+s

* Repeating annotationsMultiple annotations with the same type applied to a single program element

* o more apt tool and associated AP4 Complete the transition to the J&R :9 implementation

* 7oc"ree AP4 Provide access to the syntactic elements o% a !avadoc comment

* 7ocLint tool ;se 7oc"ree AP4 to identi%y asic errors in !avadoc comments

* Javadoc support in javax.tools 4nvo-e !avadoc tools %rom AP4 as well as command line

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Li rary

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*oncurrency = dates

* &cala le update varia les DoubleAccumulator ( DoubleAdder ( etc

Multiple varia les avoid update contention 6ood %or %re=uent updates( in%re=uent reads

* ConcurrentHas !ap updates 4mproved scanning support( -ey computation

* "or#$oin%ool improvements Completion ased design %or 4' ound applications "hread that is loc-ed hands wor- to thread that is running

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Bul 'ata ? erations "or *ollections

* Adding 3 et %unctionality* L4 > style processing

* &erial and parallel implementations* 6enerally e)pressed with Lam da statements

* Parallel implementation uilds on For-/Join %ramewor-

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'ate and Ti$e PIs

* A new date( time( and calendar AP4 %or the Java &E plat%orm

* &upports standard time concepts* Partial( duration( period( intervals

* date( time( instant( and time/?one

* 4nitially provides a limited set o% calendar systems and will e

e)tensi le to others* ;ses relevant standards( including 4&'/8:@ ( CL7R( and .CPB

* .ased on an e)plicit time/scale with a connection to ;"C

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J'B* 9Minor enhancements %or usa ility and porta ility

* Add setter

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S$all (or er#a s not) t#in+s

* Enhance core li raries with Lam das +not small thing,* Parallel array sorting +improve )B,

* .ase :B Encoding and 7ecoding +no need o% undocumented AP4,* Charset implementation improvements

Reduced si?e o% charsets 4mproved per%ormance o% encoding

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933

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Java SE (and 2eyond@)

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Aision Intero era2ility

* 4mproved support %or non/Java languages

* 4nvo-edynamic +done,* Java

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Aision *loud

* Multi/tenancy +J7I 81,

* 4mproved sharing etween J Ms in same '&* Per/thread

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Aision an+ua+e Ceatures

* Large data support +J7I 9,* Large arrays +:B it support,

* ;ni%ied type system +J7I @1,* o more primitives( ma-e everything o !ects

* 'ther type rei%ication +J7I @1,* "rue generics

* Function types

* 7ata structure optimi?ations +J7I @1,* &tructs( multi/dimensional arrays( etc* Close last+K, per%ormance gap to low/level languages

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Aision Inte+ration

* Modern device support +J7I 81,

* Multitouch +J7I 81,* Location +J7I 81,* &ensors H compass( accelerometer( temperature( pressure( 333 +J7I 81,

* Geterogenous compute models +J7I 91,

* Java language support %or 6P;( FP6A( o%%load engines( remote PLL333

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T#e Pat# Cor&ard (J'/ 1D)

* 'pen development* Prototyping and R 7 in 'penJ7I* Cooperate with partners( academia( greater community

* 5or- on ne)t J7I( %uture %eatures in parallel

*/year cycle %or Java &E releases

J SE " $ J'/ J'/ 1

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Java SE "ro$ J'/ to J'/ 1

D11 D1F D1

J'/

D1! D1

J'/ 8 J'/ J'/ 1D J'/ 11

D1

JA4 conver+ence

4ac ?S G

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