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feat: jdk17
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‎README.md

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- Remove the Solaris and SPARC Ports（删除 Solaris 和 SPARC 端口）
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- 外部存储器访问 API（允许Java 应用程序安全有效地访问 Java 堆之外的外部内存。）
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- Record类型二次预览（在Java 14就预览过啦）
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### [JDK 17](java-17)
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---
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- [306：Restore Always-Strict Floating-PointSemantics / 恢复始终严格的浮点语义](java-17/src/main/java/com/di1shuai/java17/strictfpcase/StrictfpCase.java)
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- [356：Enhanced Pseudo-Random Number Generators / 增强型伪随机数发生器](java-17/src/main/java/com/di1shuai/java17/random/RandomCase.java)
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- 382：New macOS Rendering Pipeline / 新的 macOS 渲染管道
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- 391：macOS/AArch64 Port / macOS/AArch64 平台支持
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- 398：Deprecate the Applet API for Removal / 弃用即将删除的Applet API
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- 403：Strongly Encapsulate JDK Internals / 强封装JDK的内部API
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- [406：Pattern Matching for switch（Preview） / Switch模式匹配（预览)](java-17/src/main/java/com/di1shuai/java17/instanceofcase/InstanceOfCase.java)
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- 407：Remove RMI Activation / 删除 RMI 激活机制
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- 409：Sealed Classes / 密封类
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- 410：Remove the Experimental AOT and JIT Compiler / 删除实验性 AOT 和 JIT 编译器
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- 411：Deprecate the Security Manager For Removal / 弃用即将删除的安全管理器
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- 412：Foreign Function & Memory API（Incubator） / 外部函数和内存 API（孵化器）
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- 414：Vector API （Second Incubator） / 矢量 API（二次孵化）
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- 415：Context-Specific Deserialization Filters / 特定于上下文的反序列化过滤器

‎java-17/README.md

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### [JDK 17](java-17)
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---
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- [306：Restore Always-Strict Floating-PointSemantics / 恢复始终严格的浮点语义](src/main/java/com/di1shuai/java17/strictfpcase/StrictfpCase.java)
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- [356：Enhanced Pseudo-Random Number Generators / 增强型伪随机数发生器](src/main/java/com/di1shuai/java17/random/RandomCase.java)
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- 382：New macOS Rendering Pipeline / 新的 macOS 渲染管道
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- 391：macOS/AArch64 Port / macOS/AArch64 平台支持
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- 398：Deprecate the Applet API for Removal / 弃用即将删除的Applet API
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- 403：Strongly Encapsulate JDK Internals / 强封装JDK的内部API
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- [406：Pattern Matching for switch（Preview） / Switch模式匹配（预览)](src/main/java/com/di1shuai/java17/instanceofcase/InstanceOfCase.java)
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- 407：Remove RMI Activation / 删除 RMI 激活机制
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- 409：Sealed Classes / 密封类
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- 410：Remove the Experimental AOT and JIT Compiler / 删除实验性 AOT 和 JIT 编译器
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- 411：Deprecate the Security Manager For Removal / 弃用即将删除的安全管理器
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- 412：Foreign Function & Memory API（Incubator） / 外部函数和内存 API（孵化器）
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- 414：Vector API （Second Incubator） / 矢量 API（二次孵化）
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- 415：Context-Specific Deserialization Filters / 特定于上下文的反序列化过滤器

‎java-17/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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<modelVersion>4.0.0</modelVersion>
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<groupId>com.di1shuai</groupId>
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<artifactId>java-17</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<maven.compiler.source>17</maven.compiler.source>
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<maven.compiler.target>17</maven.compiler.target>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>17</source>
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<target>17</target>
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<compilerArgs>--enable-preview</compilerArgs>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎java-17/src/main/java/com/di1shuai/java17/Main.java

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package com.di1shuai.java17;
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/**
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* @author shea
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* @since 2022/11/21
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*/
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public class Main {
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public static void main(String[] args) {
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}
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}

‎java-17/src/main/java/com/di1shuai/java17/instanceofcase/InstanceOfCase.java

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package com.di1shuai.java17.instanceofcase;
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/**
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* @author shea
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* @since 2022/11/21
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*/
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public class InstanceOfCase {
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public static void main(String[] args) {
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JDK17_instanceof_switch(1);
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}
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public static void JDK17_instanceof_switch(Object o) {
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switch (o) {
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case Integer i -> System.out.println(i);
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case Long l -> System.out.println(l);
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case Double d -> System.out.println(d);
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case String s -> System.out.println(s);
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default -> System.out.println("UNKNOWN");
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}
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}
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public static void JDK17_before_instanceof_switch(Object o) {
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//o instanceof Integer i 为JDK16新特性
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if (o instanceof Integer i) {
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System.out.println(i);
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} else if (o instanceof Long l) {
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System.out.println(l);
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} else if (o instanceof Double d) {
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System.out.println(d);
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} else if (o instanceof String s) {
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System.out.println(s);
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} else {
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System.out.println("UNKNOWN");
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}
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}
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public static void JDK13_switch() {
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String day = "MONDAY";
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int i = switch (day) {
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case "MONDAY" -> 1;
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case "TUESDAY" -> 2;
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case "WEDNESDAY" -> 3;
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case "THURSDAY" -> 4;
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case "FRIDAY" -> 5;
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case "SATURDAY" -> 6;
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case "SUNDAY" -> 7;
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default -> 0;
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};
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System.out.println(i);
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}
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public static void JDK12_switch() {
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String day = "MONDAY";
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switch (day) {
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case "MONDAY" -> System.out.println(1);
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case "TUESDAY" -> System.out.println(2);
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case "WEDNESDAY" -> System.out.println(3);
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case "THURSDAY" -> System.out.println(4);
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case "FRIDAY" -> System.out.println(5);
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case "SATURDAY" -> System.out.println(6);
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case "SUNDAY" -> System.out.println(7);
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default -> System.out.println(0);
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}
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}
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public static void JDK11_switch() {
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String day = "MONDAY";
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switch (day) {
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case "MONDAY":
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System.out.println(1);
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break;
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case "TUESDAY":
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System.out.println(2);
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break;
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case "WEDNESDAY":
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System.out.println(3);
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break;
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case "THURSDAY":
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System.out.println(4);
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break;
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case "FRIDAY":
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System.out.println(5);
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break;
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case "SATURDAY":
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System.out.println(6);
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break;
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case "SUNDAY":
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System.out.println(7);
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break;
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default:
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System.out.println(0);
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break;
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}
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}
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}

‎java-17/src/main/java/com/di1shuai/java17/random/RandomCase.java

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package com.di1shuai.java17.random;
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import java.util.random.RandomGenerator;
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import java.util.random.RandomGeneratorFactory;
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/**
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* @author shea
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* @since 2022/11/21
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*/
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public class RandomCase {
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public static void main(String[] args){
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RandomGeneratorFactory.all().forEach(e -> System.out.println(e.group() + "-" + e.name()));
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//生成10个10以内的随机数
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RandomGeneratorFactory<RandomGenerator> L128X1024MixRandom = RandomGeneratorFactory.of("L128X1024MixRandom");
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RandomGenerator randomGenerator = L128X1024MixRandom.create(System.currentTimeMillis());
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for (int i = 0; i < 10; i++) {
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System.out.println(randomGenerator.nextInt(10));
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}
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}
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}

‎java-17/src/main/java/com/di1shuai/java17/strictfpcase/StrictfpCase.java

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package com.di1shuai.java17.strictfpcase;
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/**
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* @author shea
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* @since 2022/11/21
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* 严格的浮点数学计算 strictfp
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*
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*/
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public strictfp class StrictfpCase {
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public strictfp double calculate() {
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// ......
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return 0.0;
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}
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}

‎java-base/src/main/java/com/di1shuai/base/jvm/classloader/JVMClassLoader.java

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public static void main(String[] args) {
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// null -> Bootstrap
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// 为什么为Null，因为Bootstrap使用C++写的，在Java中没有与之相对应的类，所以返回了空值
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System.out.println(String.class.getClassLoader());
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System.out.println(String.class.getClassLoader());
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//sun.misc.Launcher$ExtClassLoader@3d4eac69 -> Extention
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System.out.println(sun.net.spi.nameservice.dns.DNSNameService.class.getClassLoader());
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// System.out.println(sun.net.spi.nameservice.dns.DNSNameService.class.getClassLoader());
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//sun.misc.Launcher$AppClassLoader@6d06d69c -> App
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System.out.println(JVMClassLoader.class.getClassLoader());
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//双亲委派
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System.out.println("===================");
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// null -> Bootstrap
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System.out.println(sun.net.spi.nameservice.dns.DNSNameService.class.getClassLoader().getClass().getClassLoader());
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// System.out.println(sun.net.spi.nameservice.dns.DNSNameService.class.getClassLoader().getClass().getClassLoader());
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// null -> Bootstrap
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System.out.println(JVMClassLoader.class.getClassLoader().getClass().getClassLoader());
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// app -> extention -> bootstrap
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System.out.println(JVMClassLoader.class.getClassLoader().getParent());
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System.out.println(JVMClassLoader.class.getClassLoader().getParent().getParent());

‎pom.xml

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<version>1.0-SNAPSHOT</version>
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<modules>
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<module>java-base</module>
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<module>java-7</module>
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<module>java-8</module>
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<module>java-11</module>
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<module>java-15</module>
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<module>java-9</module>
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<module>java-7</module>
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<module>java-10</module>
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<module>java-11</module>
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<module>java-12</module>
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<module>java-13</module>
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<module>java-14</module>
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<module>java-15</module>
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<module>java-17</module>
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</modules>
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<dependencyManagement>
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</dependencies>
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</dependencyManagement>
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</project>
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</project>

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