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‎.gitignore‎

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HELP.md
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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**
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!**/src/test/**
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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### VS Code ###
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.vscode/

‎pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.2.0.RELEASE</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.wbs</groupId>
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<artifactId>java8-lambda</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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<name>java8-lambda</name>
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<description>Learning java8 demo</description>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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<exclusions>
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<exclusion>
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<groupId>org.junit.vintage</groupId>
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<artifactId>junit-vintage-engine</artifactId>
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</exclusion>
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</exclusions>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎src/main/java/com/wbs/java8lambda/Java8LambdaApplication.java‎

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package com.wbs.java8lambda;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class Java8LambdaApplication {
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public static void main(String[] args) {
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SpringApplication.run(Java8LambdaApplication.class, args);
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}
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}

‎src/main/java/com/wbs/java8lambda/chapter1/FilteringApples.java‎

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package com.wbs.java8lambda.chapter1;
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import com.wbs.java8lambda.entity.Apple;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import java.util.function.Predicate;
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/**
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* 第一章示例
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*
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* @author: wangbingshuai
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* @create: 2019-10-28 15:06
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**/
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public class FilteringApples {
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public static void main(String[] args) {
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List<Apple> apples = Arrays.asList(new Apple(80, "green"),
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new Apple(155, "green"),
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new Apple(120, "red"));
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List<Apple> apples1 = filterGreenApples(apples);
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System.out.println(apples1);
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List<Apple> apples2 = filterHeavyApples(apples);
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System.out.println(apples2);
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List<Apple> greenApples = filterApples(apples, FilteringApples::isGreenApple);
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System.out.println(greenApples);
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List<Apple> heavyApples = filterApples(apples, FilteringApples::isHeavyApple);
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System.out.println(heavyApples);
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List<Apple> greenApples2 = filterApples(apples, (Apple a) -> "green".equals(a.getColor()));
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System.out.println(greenApples2);
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List<Apple> heavyApples2 = filterApples(apples, a -> a.getWeight() > 150);
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System.out.println(heavyApples2);
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List<Apple> weirdApples = filterApples(apples, a -> a.getWeight() < 80 || "brown".equals(a.getColor()));
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System.out.println(weirdApples);
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}
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private static boolean isGreenApple(Apple apple) {
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return "green".equals(apple.getColor());
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}
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private static boolean isHeavyApple(Apple apple) {
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return apple.getWeight() > 150;
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}
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private static List<Apple> filterApples(List<Apple> list, Predicate<Apple> p) {
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List<Apple> result = new ArrayList<>();
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for (Apple apple : list) {
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if (p.test(apple)) {
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result.add(apple);
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}
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}
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return result;
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}
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private static List<Apple> filterGreenApples(List<Apple> list) {
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List<Apple> result = new ArrayList<>();
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for (Apple apple : list) {
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if ("green".equals(apple.getColor())) {
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result.add(apple);
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}
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}
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return result;
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}
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private static List<Apple> filterHeavyApples(List<Apple> list) {
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List<Apple> result = new ArrayList<>();
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for (Apple apple : list) {
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if (apple.getWeight() > 150) {
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result.add(apple);
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}
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}
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return result;
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}
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}

‎src/main/java/com/wbs/java8lambda/chapter2/AppleColorPredicate.java‎

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package com.wbs.java8lambda.chapter2;
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import com.wbs.java8lambda.entity.Apple;
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/**
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* TODO
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*
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* @author: wangbingshuai
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* @create: 2019-10-28 16:57
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**/
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public class AppleColorPredicate implements ApplePredicate {
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@Override
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public boolean test(Apple apple) {
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return "green".equals(apple.getColor());
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}
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}

‎src/main/java/com/wbs/java8lambda/chapter2/ApplePredicate.java‎

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package com.wbs.java8lambda.chapter2;
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import com.wbs.java8lambda.entity.Apple;
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/**
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* TODO
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*
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* @author: wangbingshuai
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* @create: 2019-10-28 16:55
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**/
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public interface ApplePredicate {
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boolean test(Apple apple);
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}

‎src/main/java/com/wbs/java8lambda/chapter2/AppleRedAndHeavyPredicate.java‎

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package com.wbs.java8lambda.chapter2;
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import com.wbs.java8lambda.entity.Apple;
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/**
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* TODO
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*
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* @author: wangbingshuai
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* @create: 2019-10-28 16:58
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**/
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public class AppleRedAndHeavyPredicate implements ApplePredicate {
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@Override
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public boolean test(Apple apple) {
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return "red".equals(apple.getColor()) && apple.getWeight() > 150;
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}
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}

‎src/main/java/com/wbs/java8lambda/chapter2/AppleWeightPredicate.java‎

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package com.wbs.java8lambda.chapter2;
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import com.wbs.java8lambda.entity.Apple;
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/**
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* TODO
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*
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* @author: wangbingshuai
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* @create: 2019-10-28 16:56
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**/
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public class AppleWeightPredicate implements ApplePredicate {
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@Override
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public boolean test(Apple apple) {
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return apple.getWeight() > 150;
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}
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}

‎src/main/java/com/wbs/java8lambda/chapter2/FilteringApples.java‎

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package com.wbs.java8lambda.chapter2;
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import com.wbs.java8lambda.entity.Apple;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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/**
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* 第二章示例
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*
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* @author: wangbingshuai
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* @create: 2019-10-28 16:48
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**/
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public class FilteringApples {
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public static void main(String[] args) {
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List<Apple> appleList = Arrays.asList(new Apple(80, "green"),
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new Apple(155, "green"),
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new Apple(120, "red"));
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List<Apple> greenApples = filterAppleByColor(appleList, "green");
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System.out.println(greenApples);
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List<Apple> redApples = filterAppleByColor(appleList, "red");
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System.out.println(redApples);
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List<Apple> greenApples2 = filter(appleList, new AppleColorPredicate());
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System.out.println(greenApples2);
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List<Apple> heavyApples = filter(appleList, new AppleWeightPredicate());
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System.out.println(heavyApples);
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List<Apple> redAndHeavyApples = filter(appleList, new AppleRedAndHeavyPredicate());
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System.out.println(redAndHeavyApples);
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List<Apple> redApples2 = filter(appleList, new ApplePredicate() {
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@Override
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public boolean test(Apple apple) {
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return apple.getColor().equals("red");
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}
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});
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System.out.println(redApples2);
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}
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private static List<Apple> filterAppleByColor(List<Apple> list, String color) {
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List<Apple> result = new ArrayList<>();
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for (Apple apple : list) {
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if (apple.getColor().equals(color)) {
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result.add(apple);
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}
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}
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return result;
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}
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private static List<Apple> filter(List<Apple> list, ApplePredicate predicate) {
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List<Apple> result = new ArrayList<>();
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for (Apple apple : list) {
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if (predicate.test(apple)) {
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result.add(apple);
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}
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}
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return result;
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}
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private static List<Apple> filterGreenApples(List<Apple> list) {
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List<Apple> result = new ArrayList<>();
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for (Apple apple : list) {
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if ("green".equals(apple.getColor())) {
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result.add(apple);
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}
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}
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return result;
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}
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private static List<Apple> filterApplesByWeight(List<Apple> list, int weight) {
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List<Apple> result = new ArrayList<>();
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for (Apple apple : list) {
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if (apple.getWeight() > weight) {
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result.add(apple);
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}
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}
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return result;
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}
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}

‎src/main/java/com/wbs/java8lambda/chapter2/MeaningOfThis.java‎

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package com.wbs.java8lambda.chapter2;
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/**
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* TODO
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*
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* @author: wangbingshuai
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* @create: 2019-10-28 17:10
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**/
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public class MeaningOfThis {
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public static int value = 4;
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public void doIt() {
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int value = 6;
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Runnable runnable = new Runnable() {
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public final int value = 5;
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@Override
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public void run() {
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int value = 10;
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System.out.println(this.value);
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}
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};
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runnable.run();
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}
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public static void main(String[] args) {
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MeaningOfThis meaningOfThis = new MeaningOfThis();
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meaningOfThis.doIt();
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}
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}

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