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feat(collections-lambda): Seção de lambda com collections.
Criação da seção com exemplos da utilização de Lambda e Streams em Collections. Ref. Issue #39
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‎book/08-java-collections/sections/02-collections-lambda.asc‎

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:java-package: src/org/j6toj8/collections
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:section-java-package: ../../../{java-package}
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=== Diamond Operator (Operador Diamante)
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.Objetivo
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--------------------------------------------------
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Develop code that iterates a collection, filters a collection, and sorts a collection by using lambda expressions
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-
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Desenvolver código que itera uma coleção, filtra um coleção, e classifica em ordem uma coleção utilizando expressões lambda
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--------------------------------------------------
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As seções de *Expressões Lambda* e *Streams* já possuem bastante conteúdo sobre os tópicos desse objetivo, e as explicações em detalhes podem ser encontradas lá. Aqui serão apresentados apenas exemplos adicionais especificamente em coleções (__Collections__), pois alguns exemplos das outras exceções utilizam outros tipos de __Streams__.
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. É possível iterar diretamente sobre uma coleção utilizando forEach.
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[source,java,indent=0]
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.{java-package}/lambda/CollectionsLambda_ForEach.java
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----
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include::{section-java-package}/lambda/CollectionsLambda_ForEach.java[tag=code]
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----
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.Saída no console
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[source,console]
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----
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1
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6
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7
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2
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9
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----
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. É possível filtrar a coleção.
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[source,java,indent=0]
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.{java-package}/lambda/CollectionsLambda_Filter.java
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----
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include::{section-java-package}/lambda/CollectionsLambda_Filter.java[tag=code]
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----
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.Saída no console
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[source,console]
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----
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6
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7
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----
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. É possível classificar em ordem a coleção.
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[source,java,indent=0]
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.{java-package}/lambda/CollectionsLambda_Sort.java
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----
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include::{section-java-package}/lambda/CollectionsLambda_Sort.java[tag=code]
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----
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.Saída no console
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[source,console]
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----
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1
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----
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. É possível combinar as operações.
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[source,java,indent=0]
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.{java-package}/lambda/CollectionsLambda_Combined.java
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----
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include::{section-java-package}/lambda/CollectionsLambda_Combined.java[tag=code]
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----
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.Saída no console
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[source,console]
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----
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----
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****
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* Using Streams
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Boyarsky, Jeanne; Selikoff, Scott. OCP: Oracle Certified Professional Java SE 8 Programmer II Study Guide (p. 185). Wiley. Edição do Kindle.
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* https://www.baeldung.com/java-8-streams[The Java 8 Stream API Tutorial.]
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****

‎ch08-java-collections.asc‎

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== Java Collections
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include::book/08-java-collections/sections/01-diamond.asc[]
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include::book/08-java-collections/sections/02-collections-lambda.asc[]

‎src/org/j6toj8/collections/lambda/CollectionsLambda_Combined.java‎

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package org.j6toj8.collections.lambda;
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import java.util.Arrays;
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import java.util.List;
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public class CollectionsLambda_Combined {
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public static void main(String[] args) {
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// tag::code[]
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List<Integer> list = Arrays.asList(1, 6, 7, 2, 9, 54, 13, 87, 23, 97, 34, 17, 34, 89, 35, 26);
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list.stream()
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.sorted()
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.filter(n -> n > 10)
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.filter(n -> n % 2 == 0)
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.forEach(System.out::println);
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// end::code[]
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}
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}

‎src/org/j6toj8/collections/lambda/CollectionsLambda_Filter.java‎

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package org.j6toj8.collections.lambda;
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import java.util.Arrays;
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import java.util.List;
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public class CollectionsLambda_Filter {
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public static void main(String[] args) {
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// tag::code[]
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List<Integer> list = Arrays.asList(1, 6, 7, 2, 9);
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list.stream()
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.filter(n -> n > 2)
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.forEach(System.out::println);
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// end::code[]
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}
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}

‎src/org/j6toj8/collections/lambda/CollectionsLambda_ForEach.java‎

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package org.j6toj8.collections.lambda;
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import java.util.Arrays;
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import java.util.List;
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public class CollectionsLambda_ForEach {
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public static void main(String[] args) {
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// tag::code[]
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List<Integer> list = Arrays.asList(1, 6, 7, 2, 9);
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list.forEach(System.out::println);
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// end::code[]
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}
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}

‎src/org/j6toj8/collections/lambda/CollectionsLambda_Sort.java‎

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package org.j6toj8.collections.lambda;
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import java.util.Arrays;
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import java.util.List;
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public class CollectionsLambda_Sort {
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public static void main(String[] args) {
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// tag::code[]
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List<Integer> list = Arrays.asList(1, 6, 7, 2, 9);
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list.stream()
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.sorted()
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.forEach(System.out::println);
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// end::code[]
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}
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}

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