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🍱 update lambda3 video url
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‎README.md‎

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@@ -22,9 +22,9 @@ java 8 改变了我们思考和编码的方式，在这里你可以学习到 Jav
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|:-----:|:--------|:-------|:-------|
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|第 1 课 | [课程介绍](https://github.com/biezhi/learn-java8) | [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_1.html#page=1) ¦ [Youtube](https://youtu.be/A733pQxiEDk) | 无 |
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|第 2 课 | [Java 8 的发展](https://github.com/biezhi/learn-java8/blob/master/java8-growing/README.md) | [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_2.html#page=2) ¦ [Youtube](https://youtu.be/fHhgm1AZzhs) | [java8-growing](https://github.com/biezhi/learn-java8/tree/master/java8-growing/src/main/java/io/github/biezhi/java8/growing) |
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|第 3 课 | [理解 lambda](https://github.com/biezhi/learn-java8/blob/master/java8-lambda/README.md) | [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_3.html#page=3) ¦ [Youtube](https://youtu.be/1T2Z9eDowjY) | [java8-lambda](https://github.com/biezhi/learn-java8/tree/master/java8-lambda/src/main/java/io/github/biezhi/java8/lambda/lesson1) |
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|第 4 课 | [初尝 lambda](https://github.com/biezhi/learn-java8/blob/master/java8-lambda/README.md) | [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_4.html#page=4) ¦ [Youtube](https://youtu.be/nzATBaLNzm8) | [java8-lambda](https://github.com/biezhi/learn-java8/tree/master/java8-lambda/src/main/java/io/github/biezhi/java8/lambda/lesson2) |
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|第 5 课 | [lambda 进阶](https://github.com/biezhi/learn-java8/blob/master/java8-lambda/README.md) | 哔哩哔哩 ¦ Youtube | |
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|第 3 课 | [理解 lambda](https://github.com/biezhi/learn-java8/blob/master/java8-lambda/README.md) | [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_3.html#page=3) ¦ [Youtube](https://youtu.be/1T2Z9eDowjY) | [lambda1](https://github.com/biezhi/learn-java8/tree/master/java8-lambda/src/main/java/io/github/biezhi/java8/lambda/lesson1) |
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|第 4 课 | [初尝 lambda](https://github.com/biezhi/learn-java8/blob/master/java8-lambda/README.md) | [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_4.html#page=4) ¦ [Youtube](https://youtu.be/nzATBaLNzm8) | [lambda2](https://github.com/biezhi/learn-java8/tree/master/java8-lambda/src/main/java/io/github/biezhi/java8/lambda/lesson2) |
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|第 5 课 | [lambda 进阶](https://github.com/biezhi/learn-java8/blob/master/java8-lambda/README.md) | [哔哩哔哩](https://www.bilibili.com/video/av19287893/index_5.html#page=5) ¦ [Youtube](https://youtu.be/bfc5irPf9ew) | [lambda3](https://github.com/biezhi/learn-java8/tree/master/java8-lambda/src/main/java/io/github/biezhi/java8/lambda/lesson3) |
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|第 6 课 | 默认方法的妙用 | 哔哩哔哩 ¦ Youtube | |
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|第 7 课 | 干掉空指针之 Optional | 哔哩哔哩 ¦ Youtube | |
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|第 8 课 | 理解 Stream | 哔哩哔哩 ¦ Youtube | |

‎java8-lambda/src/main/java/io/github/biezhi/java8/lambda/lesson2/FunctionalDemo.java‎

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*/
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public void predicate() {
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Predicate<String> namesStartingWithS = name -> name.startsWith("s");
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boolean hello = namesStartingWithS.test("Hello");
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// false
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}
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/**
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* 消费数据
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*/
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public void consumer() {
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Consumer<String> messageConsumer = message -> System.out.println(message);
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messageConsumer.accept("Learn Java8"); // Learn Java8"
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}
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/**
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* 转换
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*/
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public void function() {
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Function<String, String> toUpperCase = name -> name.toUpperCase();
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toUpperCase.apply("java"); // Java
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}
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/**
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* 提供数据
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*/
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public void supplier() {
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Supplier<String> uuidGenerator = () -> UUID.randomUUID().toString();
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System.out.println(uuidGenerator.get());
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}
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public static void main(String[] args) {

‎java8-lambda/src/main/java/io/github/biezhi/java8/lambda/lesson3/Lambdas.java‎

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package io.github.biezhi.java8.lambda.lesson3;
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import io.github.biezhi.java8.lambda.lesson1.Project;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.function.Function;
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import java.util.function.Predicate;
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/**
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* lambdas
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*
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* @author biezhi
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* @date 2018/2/10
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*/
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public class Lambdas {
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public static List<Project> buildData() {
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List<Project> data = new ArrayList<>();
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data.add(Project.builder().name("Blade").language("java").author("biezhi")
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.stars(3500).description("Lightning fast and elegant mvc framework for Java8").build());
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data.add(Project.builder().name("Tale").language("java").author("biezhi")
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.stars(2600).description("Best beautiful java blog, worth a try").build());
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data.add(Project.builder().name("Vue.js").language("js").author("yyx990803")
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.stars(83000).description("A progressive, incrementally-adoptable JavaScript framework for building UI on the web.").build());
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data.add(Project.builder().name("Flask").language("python").author("pallets")
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.stars(10500).description("The Python micro framework for building web applications").build());
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data.add(Project.builder().name("Elves").language("java").author("biezhi")
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.stars(200).description("Spider").build());
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return data;
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}
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public static void main(String[] args) {
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List<Project> projects = buildData();
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// List<String> names = getNames(projects);
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// List<String> names = getNames(projects, project -> project.getStars() > 1000);
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List<String> names = getNames(projects, project -> project.getStars() > 1000, project -> project.getDescription());
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List<Integer> stars = getNames(projects, project -> project.getStars() > 1000, ProjectFunction.buildStarFunction());
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System.out.println(stars);
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// names.forEach(name -> System.out.println(name));
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}
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public static List<String> getNames(List<Project> projects) {
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List<String> names = new ArrayList<>();
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for (Project project : projects) {
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names.add(project.getName());
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}
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return names;
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}
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public static List<String> getNames(List<Project> projects, Predicate<Project> predicate) {
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List<String> names = new ArrayList<>();
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for (Project project : projects) {
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if (predicate.test(project)) {
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names.add(project.getName());
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}
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}
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return names;
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}
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public static <R> List<R> getNames(List<Project> projects, Predicate<Project> predicate, Function<Project, R> function) {
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List<R> names = new ArrayList<>();
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for (Project project : projects) {
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if (predicate.test(project)) {
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names.add(function.apply(project));
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}
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}
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return names;
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}
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}
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interface ProjectFunction<R> extends Function<Project, R> {
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static ProjectFunction<Integer> buildStarFunction() {
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return Project::getStars;
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}
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}

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