Java Extension Methods

Mar 9, 20111 like1,655 views

This document discusses new features in Java 8 including extension methods, lambda expressions, and single abstract method (SAM) types. Extension methods allow adding new methods to existing interfaces without breaking binary compatibility. Lambda expressions provide a concise way to pass functionality as an argument to methods. SAM types allow lambda expressions to be passed to interfaces with a single abstract method. These features together enable more readable sorting and threading code in Java.

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3 mars 2011Sida 2Extension MethodsWhathappenshere?people.sort(#Person.lastName)

Extension MethodsWhatwehave in Java today…Toomuchnoise!Collections.sort(people, new Comparator() { @Override public intcompare(Person x, Person y) {returnx.getLastName().compareTo(y.getLastName()); }});3 mars 2011Sida 3

SAM types and LambdasSingle Abstract Method (SAM)3 mars 2011Sida 4Thread th = new Thread(new Runnable() { public void run() { doSomeStuff(); doMoreStuff(); } }); //OLD WAYThread th = new Thread(#(){ doSomeStuff(); doMoreStuff(); } )

3 mars 2011Sida 5SAM and Lambdas conversionWith Lambdas and SAM it looks likeCollections.sort(people, #{ Person x, Person y -> x.getLastName().compareTo(y.getLastName()) });//Old way, let’shopewesooncan @Deprecate this codeCollections.sort(people, new Comparator() { @Override public intcompare(Person x, Person y) {returnx.getLastName().compareTo(y.getLastName()); }});

EnchancedLibraries (Collections)But it gets evenbetter with EnchancedLibraries3 mars 2011Sida 6//Collections is updated. No need to specify Person x and //Person y, just say ’take a person in the [list] and sort by//last name’ (its implicit that compareToshould be used)Collections.sortBy(people, #{ Person p -> p.getLastName() });

TypeInference…and with somehelp from the compiler…we get TypeInference3 mars 2011Sida 7//No need to specify Person, the compilercan (often) helpus //with this. Compilerintrospectpeople-list via genericsCollections.sortBy(people, #{ p -> p.getLastName() });

MethodReferenceA new feature with Project Lambdas is MethodReferenceswhich gives us…3 mars 2011Sida 8//Methodreferenceallowsus to ’point’ directly to the method//wewant to use in oursorting. Whyuse a particularobject?Collections.sortBy(people, #Person.getLastName );

Extension Methodsand with Extension Methodswefinally get…3 mars 2011Sida 9//Nice, wehavepeople (a List<T>) whichcandosorting. But //wait a minuteList<T> don’thave a sort(…) method… Howdid //this work?people.sortBy( #Person.getLastName);

Extension Methods (DefenderMethods)A way to evolve interfaces WITHOUT breakingbinarybackwardscompatability.Means that wecanadd new methods in an existing interface and the implementingclientsdoes NOT need to implement that method!A reallyneed for updatingaging Collections interface, especiallywhen lambdas and Fork-Join are introduced in JavaThe interface willsupply a default implementationif you do not supplyoneyourself3 mars 2011Sida 10

EnhancedlibrariesProposed Syntax3 mars 2011Sida 11public interface List<T> extends Collection<T> { public intsize(); // The rest of the existing List methods extensionvoid sort(List<T> list) default Collections.<T>sort;}

3 mars 2011Sida 12Extension MethodsQuestions?people.eat(#Senadin.cake)

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