Java 7: Quo vadis?

[object Object],Java 7 : Quo vadis? DISTRIBUTED SYSTEMS RESEARCH GROUP http://dsrg.mff.cuni.cz/ CHARLES UNIVERSITY IN PRAGUE Faculty of Mathematics and Physics

[object Object],[object Object],[object Object],[object Object],[object Object],Outline

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Java development process

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Language extensions

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Lang. Ext. - JUG proposal

[object Object],[object Object],[object Object],[object Object],[object Object],Lang. Ext. - JUG proposal enum Size {SMALL, MEDIUM, LARGE}; if (mySize < yourSize) { /* ... */ } switch (s) { “ yellow” : /* ... */ break ; “ red” : /* ... */ break ; defaul t: /* ... */ break ; } JDK7 JDK7

[object Object],[object Object],[object Object],[object Object],[object Object],Lang. Ext. - JUG proposal public class Beana { public void setName(String void) {} public void setDate(Date date) {} } Beana a = new Beana() .setName(“name”) .setDate(new Date()); import static java.util.Collections.sort; ... List<String> list = ...; list.sort(); JDK7

[object Object],[object Object],Lang. Ext. - JUG proposal ,[object Object],[object Object],[object Object],public void test() throws IOException { try { doSomething(); } catch ( final Throwable ex) { throw ex; } } try { return clazz.newInstance(); } catch (InstantiationException | IllegalAccessException e) { /* .. */ } public void doSomething throws IOException {} public void test() throws Throwable { try { doSomething(); } catch (Throwable ex) } throw ex; } JDK7 JDK7 JDK5

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Lang. Ext. - XML lang. support public void addMember(XML xml, String name, Integer age) { xml.addChild(<member> <name> { name } </name> <age> { 26 } </age> </member>); } public void makeYounger(XML fs, Integer newAge) { List<XML> l = fs.findAll(“member[age>25]”); for (XML a : l) { a.get(“age”).set(newAge); } } JDK7 JDK7

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Lang. Ext. - closures {String, String => String} simpleConcat = {String a, String b => a+b }; String s = “DS”; String g = “RG”; String dsrg = simpleConcat.invoke(s,t); interface Func<R extends String, A1 super String, A2 super String> { public R invoke(A1, A2); } ↔ Locks.withLock(lock, {=> doSomething()}); Collections.map(strings, {Strings s => Integer.decode(s)}); JDK7

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Lang. Ext. - annotation extension

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Lang. Ext. - proposed enhancements

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Related projects

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Rel. projects – modules superpackage jdk { member package java.util; member package java.io; member package sun.io; // Impl detail export java.util.*; // Public API export java.io.*; } JDK7

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Rel. projects – modules

Rel. projects – modules ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],Rel. projects – modules and OSGi

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Rel. projects – SWING API

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Rel. projects – beans class Person { private String surname; private Integer age; private Person mother; } // Bean property Property surnameP = BeanProperty.create(“surname”); // EL properties – JSP syntax Property motherSurnameP = BeanProperty.create(“${mother.surname}”); Property isTeenP = BeanProperty.create(“${age < 20}”); // m stores information about a person System.out.println(“Member surname = “ + surnameP.getValue(m)); System.out.println(“Member's mother surname = “ + surnameP.getValue(M)); Binding b = Bindings.createAutoBinding(READ_WRITE, m, surnameP,m , motherSurnameP); b.bind(); // the call affects attribute m.surname motherSurnameP.setValue(m, “NewSurname”);

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Rel. projects – beans

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Rel. projects – concurrent framework

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Rel. projects – concurrent framework // PSEUDOCODE Result solve(Problem problem) { if (problem.size < SEQUENTIAL_THRESHOLD) return solveSequentially(problem); else { Result left, right; INVOKE-IN-PARALLEL { left = solve(extractLeftHalf(problem)); right = solve(extractRightHalf(problem)); } return combine(left, right); } } JDK7

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Rel. projects – invokedynamic

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Rel. projects – others

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Other proposed improvements

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],What is already implemented?

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Important for us

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Links

Java 7: Quo vadis?

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Java 7: Quo vadis?