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feat: 添加 java-8 新特性代码(https://www.wdbyte.com/java-feature/)
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‎core-java-modules/README.md‎

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## core-java-performance
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## core-java-modules
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当前模块包含 Java 核心代码
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### 相关文章
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- [Java 8 函数接口 UnaryOperator ](https://www.wdbyte.com/java8/java8-unaryoperaotr)
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- [Java 8 函数接口 BiPredicate ](https://www.wdbyte.com/java8/java8-bipredicate)
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- [Java 8 函数接口 BiFunction ](https://www.wdbyte.com/java8/java8-bifunction/)
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- [Java 8 函数接口 Supplier ](https://www.wdbyte.com/java8/java8-supplier/)
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- [Java 8 函数接口 Predicate ](https://www.wdbyte.com/java8/java8-predicate/)
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- [Java 8 函数接口 Function ](https://www.wdbyte.com/java8/java8-function/)
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- [Java 8 新特性 - forEach 遍历](https://www.wdbyte.com/java8/java8-foreach/)
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- [Java 8 新特性 - LocalDate、LocalDateTime 时间处理介绍](https://www.wdbyte.com/2019/10/jdk/jdk8-time/)
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- [Java 8 新特性 - 使用 Optional优雅的处理空指针](https://www.wdbyte.com/2019/11/jdk/jdk8-optional/)
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- [Java 8 新特性 - Lambda 表达式、函数接口了解一下](https://www.wdbyte.com/2019/11/jdk/jdk8-lambda/)
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- [Java 8 新特性 - 超强的 Stream 流操作姿势还不学习一下](https://www.wdbyte.com/2019/11/jdk/jdk8-stream/)
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- [Java 7 新特性 - 和低效 IO 说再见，Files,Paths,Path 文件操作介绍](https://www.wdbyte.com/2020/09/jdk/jdk7-file-pahs/)
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- [Java 7 新特性 - 新特性 - 快来补一波 Java 7 语法特性](https://www.wdbyte.com/2020/01/jdk/jdk7-start/)
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- [Java 中的监控与管理原理概述](https://www.wdbyte.com/java/monitoring.html)
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- [使用 JMX 监控和管理 Java 程序](https://www.wdbyte.com/java/jmx.html)

‎core-java-modules/core-java-8/README.md‎

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## core-java-java
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当前模块包含 Java 8 新特性相关代码
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### 相关文章
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- [Java 8 函数接口 UnaryOperator ](https://www.wdbyte.com/java8/java8-unaryoperaotr)
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- [Java 8 函数接口 BiPredicate ](https://www.wdbyte.com/java8/java8-bipredicate)
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- [Java 8 函数接口 BiFunction ](https://www.wdbyte.com/java8/java8-bifunction/)
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- [Java 8 函数接口 Supplier ](https://www.wdbyte.com/java8/java8-supplier/)
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- [Java 8 函数接口 Predicate ](https://www.wdbyte.com/java8/java8-predicate/)
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- [Java 8 函数接口 Function ](https://www.wdbyte.com/java8/java8-function/)
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- [Java 8 新特性 - forEach 遍历](https://www.wdbyte.com/java8/java8-foreach/)
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- [Java 8 新特性 - LocalDate、LocalDateTime 时间处理介绍](https://www.wdbyte.com/2019/10/jdk/jdk8-time/)
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- [Java 8 新特性 - 使用 Optional优雅的处理空指针](https://www.wdbyte.com/2019/11/jdk/jdk8-optional/)
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- [Java 8 新特性 - Lambda 表达式、函数接口了解一下](https://www.wdbyte.com/2019/11/jdk/jdk8-lambda/)
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- [Java 8 新特性 - 超强的 Stream 流操作姿势还不学习一下](https://www.wdbyte.com/2019/11/jdk/jdk8-stream/)
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- [Java 7 新特性 - 和低效 IO 说再见，Files,Paths,Path 文件操作介绍](https://www.wdbyte.com/2020/09/jdk/jdk7-file-pahs/)
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- [Java 7 新特性 - 新特性 - 快来补一波 Java 7 语法特性](https://www.wdbyte.com/2020/01/jdk/jdk7-start/)

‎core-java-modules/core-java-8/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"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>core-java-modules</artifactId>
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<groupId>com.wdbyte.core-java-modules</groupId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-8</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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<name>core-java-8</name>
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<packaging>jar</packaging>
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<properties>
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven.compiler.target>1.8</maven.compiler.target>
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</properties>
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</project>

‎core-java-modules/core-java-8/src/main/java/com/wdbyte/Dog.java‎

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package com.wdbyte;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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import java.util.Base64;
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/**
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* @author niulang
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* @date 2021/07/21
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*/
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public class Dog {
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private String name;
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private Integer age;
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public Dog() {
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}
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public static void main(String[] args) throws IOException {
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byte[] bytes = Files.readAllBytes(
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Paths.get("/Users/darcy/git/java-core/java-8/target/classes/com/wdbyte/JEP371Test.class"));
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String toString = Base64.getEncoder().encodeToString(bytes);
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System.out.println(toString);
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}
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public Dog(String name) {
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this.name = name;
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}
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public Dog(String name, Integer age) {
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this.name = name;
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this.age = age;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public Integer getAge() {
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return age;
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}
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public void setAge(Integer age) {
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this.age = age;
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}
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@Override
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public String toString() {
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return "Dog{" +
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", name='" + name + '\'' +
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", age=" + age +
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'}';
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}
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}

‎core-java-modules/core-java-8/src/main/java/com/wdbyte/JEP371Test.java‎

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package com.wdbyte;
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public class JEP371Test {
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public static String lookup() {return "www.wdbyte.com";}
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}

‎core-java-modules/core-java-8/src/main/java/com/wdbyte/Java8BiFunction.java‎

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package com.wdbyte;
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import java.util.function.BiFunction;
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/**
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* @author niulang
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* @date 2021/07/26
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*/
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public class Java8BiFunction {
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public static void main(String[] args) {
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// 两个字符串长度和
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BiFunction<String, String, Integer> lengthBiFun = (s1, s2) -> s1.length() + s2.length();
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Integer length = lengthBiFun.apply("java", "www.byte.com");
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System.out.println(length);
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// x 的 y 次方
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BiFunction<Integer, Integer, Double> powBiFun = (i1, i2) -> Math.pow(i1, i2);
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Double pow = powBiFun.apply(2, 10);
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System.out.println(pow);
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}
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}

‎core-java-modules/core-java-8/src/main/java/com/wdbyte/Java8BiFunctionAndThen.java‎

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package com.wdbyte;
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import java.util.function.BiFunction;
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import java.util.function.Function;
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/**
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* @author niulang
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* @date 2021/07/26
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*/
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public class Java8BiFunctionAndThen {
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public static void main(String[] args) {
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// 两个字符串长度和
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BiFunction<String, String, Integer> lengthBiFun = (s1, s2) -> s1.length() + s2.length();
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Function<Integer, String> function = s -> "长度和:" + s;
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String result = lengthBiFun.andThen(function).apply("java", "www.byte.com");
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System.out.println(result);
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}
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}

‎core-java-modules/core-java-8/src/main/java/com/wdbyte/Java8BiFunctionAndThen2.java‎

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package com.wdbyte;
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import java.util.function.BiFunction;
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import java.util.function.Function;
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/**
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* @author niulang
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* @date 2021/07/26
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*/
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public class Java8BiFunctionAndThen2 {
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public static void main(String[] args) {
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String result = convert("java",
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"www.wdbyte.com",
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(a1, a2) -> a1.length() + a2.length(),
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r1 -> "长度和:" + r1);
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System.out.println(result);
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String convert = convert(1, 2,
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(a1, a2) -> a1 + a2,
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r1 -> "和是:" + r1);
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System.out.println(convert);
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}
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public static <T1, T2, R1, R2> R2 convert( T1 t1,
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T2 t2,
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BiFunction<T1, T2, R1> biFunction,
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Function<R1, R2> function) {
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return biFunction.andThen(function).apply(t1, t2);
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}
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}

‎core-java-modules/core-java-8/src/main/java/com/wdbyte/Java8BiFunctionFilter.java‎

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package com.wdbyte;
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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.BiFunction;
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/**
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* @author niulang
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* @date 2021/07/26
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*/
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public class Java8BiFunctionFilter {
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public static void main(String[] args) {
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List<Integer> list = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12);
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// 筛选 2 的倍数
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List<Integer> result1 = filter(list, 2, Java8BiFunctionFilter::divisible);
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System.out.println(result1);
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// 筛选 3 的倍数
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List<Integer> result2 = filter(list, 3, Java8BiFunctionFilter::divisible);
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System.out.println(result2);
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// 筛选 4 的倍数
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List<Integer> result3 = filter(list, 4, Java8BiFunctionFilter::divisible);
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System.out.println(result3);
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// 筛选长度为 4 的字符串
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List<String> stringList = Arrays.asList("java", "node", "c++", "rust", "www.wdbyte.com");
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List<String> stringList1 = filter(stringList, 4, (s, n) -> s.length() == 4 ? true : null);
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System.out.println(stringList1);
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}
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/**
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* n1 / n2 是否可以除尽
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*
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* @param n1
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* @param n2
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* @return
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*/
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private static Boolean divisible(Integer n1, Integer n2) {
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if (n1 % n2 == 0) {
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return true;
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}
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return null;
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}
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/**
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* 过滤集合 List 中，符合 BiFunction<T, U, R> biFunction 的元素
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*
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* @param list
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* @param u
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* @param biFunction
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* @param <T>
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* @param <U>
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* @param <R>
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* @return
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*/
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private static <T, U, R> List<T> filter(List<T> list,
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U u,
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BiFunction<T, U, R> biFunction) {
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List<T> resultList = new ArrayList<>();
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for (T t : list) {
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if (biFunction.apply(t, u) != null) {
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resultList.add(t);
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}
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}
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return resultList;
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}
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}

‎core-java-modules/core-java-8/src/main/java/com/wdbyte/Java8Consumer.java‎

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package com.wdbyte;
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import java.util.function.Consumer;
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/**
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* @author niulang
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* @date 2021/07/20
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*/
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public class Java8Consumer {
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public static void main(String[] args) {
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Consumer<String> lengthConsumer = s -> System.out.println(s.length());
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lengthConsumer.accept("www.wdbyte.com");
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Consumer<String> printConsumer = System.out::println;
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printConsumer.accept("www.wdbyte.com");
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}
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}

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