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‎JdkLearn/learnjava.iml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
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<component name="FacetManager">
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<facet type="Spring" name="Spring">
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<configuration />
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</facet>
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<facet type="web" name="Web">
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<configuration>
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<webroots />
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<sourceRoots>
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<root url="file://$MODULE_DIR$/src/main/java" />
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<root url="file://$MODULE_DIR$/src/main/resources" />
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</sourceRoots>
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</configuration>
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</facet>
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</component>
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<component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8">
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<output url="file://$MODULE_DIR$/target/classes" />
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<output-test url="file://$MODULE_DIR$/target/test-classes" />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
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<sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
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<excludeFolder url="file://$MODULE_DIR$/target" />
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</content>
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<orderEntry type="inheritedJdk" />
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</component>
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</module>

‎JdkLearn/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>2.2.1.RELEASE</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.learnjava</groupId>
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<artifactId>learnjava</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>learnjava</name>
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<description>Demo project for Spring Boot</description>
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<properties>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<!-- redis依赖 -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-redis</artifactId>
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</dependency>
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<!-- 如果在properties中配置了pool，则需要引入这个依赖 -->
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-pool2</artifactId>
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</dependency>
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<!-- https://mvnrepository.com/artifact/hessian/hessian -->
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<dependency>
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<groupId>hessian</groupId>
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<artifactId>hessian</artifactId>
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<version>3.0.1</version>
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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</artifactId>
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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-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>junit</groupId>
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<artifactId>junit</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-test</artifactId>
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<version>5.2.1.RELEASE</version>
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<scope>compile</scope>
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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>

‎JdkLearn/src/main/java/com/learnjava/LearnjavaApplication.java‎

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package com.learnjava;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.context.annotation.PropertySource;
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@SpringBootApplication
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public class LearnjavaApplication {
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public static void main(String[] args) {
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SpringApplication.run(LearnjavaApplication.class, args);
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}
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}

‎JdkLearn/src/main/java/com/learnjava/concurent/CompletableFutureDemo.java‎

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package com.learnjava.concurent;
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import java.util.concurrent.CompletableFuture;
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public class CompletableFutureDemo {
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public static void main(String[] args) throws Exception {
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CompletableFutureDemo completableFutureDemo = new CompletableFutureDemo();
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completableFutureDemo.test_completed_future();
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}
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public void test_completed_future() throws Exception {
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String expectedValue = "the expected value";
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CompletableFuture<String> alreadyCompleted = CompletableFuture.completedFuture(expectedValue);
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System.out.println(alreadyCompleted.get());
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}
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}

‎JdkLearn/src/main/java/com/learnjava/concurent/ForkJoinDemo.java‎

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package com.learnjava.concurent;
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import java.util.concurrent.*;
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public class ForkJoinDemo {
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/**
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*
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* Fork/join用法；
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* 1. 让任务类Task继承RecursiveTask<T>， 实现RecursiveTask的compute()方法
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* 2. 在compute()方法里，调用Task.fork()方法，开启子任务，然后再调用Task.join()合并结果
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* 3. 通过线程池调用Fork/Join框架：
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* ForkJoinPool pool = new ForkJoinPool();
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* Future<Integer> future = pool.submit(task);
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* T t = future.get(1, TimeUnit.SECONDS);
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*
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*/
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public static void main(String ... args) throws ExecutionException, InterruptedException, TimeoutException {
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ForkJoinPool pool = new ForkJoinPool();
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int[] array = {100,400,200,90,80,300,600,10,20,-10,30,2000,1000};
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MaxNumber task = new MaxNumber(array, 0, array.length - 1);
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Future<Integer> future = pool.submit(task);
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System.out.println("Result:" + future.get(1, TimeUnit.SECONDS));
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}
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/**
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* how to find the max number in array by Fork/Join
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*/
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private static class MaxNumber extends RecursiveTask<Integer> {
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private int threshold = 2;
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private int[] array; // the data array
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private int index0 = 0;
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private int index1 = 0;
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public MaxNumber(int[] array, int index0, int index1) {
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this.array = array;
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this.index0 = index0;
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this.index1 = index1;
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}
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@Override
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protected Integer compute() {
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int max = Integer.MIN_VALUE;
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if ((index1 - index0) <= threshold) {
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for (int i = index0;i <= index1; i ++) {
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max = Math.max(max, array[i]);
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}
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} else {
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//fork/join
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int mid = index0 + (index1 - index0) / 2;
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MaxNumber lMax = new MaxNumber(array, index0, mid);
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MaxNumber rMax = new MaxNumber(array, mid + 1, index1);
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lMax.fork();
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rMax.fork();
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int lm = lMax.join();
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int rm = rMax.join();
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max = Math.max(lm, rm);
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}
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return max;
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}
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}
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}

‎JdkLearn/src/main/java/com/learnjava/concurent/ThreadLocalTest.java‎

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package com.learnjava.concurent;
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import java.util.concurrent.CountDownLatch;
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public class ThreadLocalTest {
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public static void main(String[] args) throws InterruptedException {
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int threads = 3;
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CountDownLatch countDownLatch = new CountDownLatch(threads);
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InnerClass innerClass = new InnerClass();
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for (int i = 1; i <= threads; i++) {
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new Thread(() -> {
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for (int j = 0; j < 4; j++) {
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innerClass.add(String.valueOf(j));
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innerClass.print();
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}
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innerClass.set("hello world");
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countDownLatch.countDown();
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}, "thread - " + i).start();
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}
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countDownLatch.await();
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}
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private static class InnerClass {
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public void add(String newStr) {
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//利用Counter类来实例化StringBuilder
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StringBuilder stringBuilder = Counter.counter.get();
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//将newStr存进ThreadLocal里
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Counter.counter.set(stringBuilder.append(newStr));
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}
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/**
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* 打印ThreadLocal的信息
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*/
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public void print() {
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System.out.printf("Thread name:%s , ThreadLocal hashcode:%s, Instance hashcode:%s, Value:%s\n",
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Thread.currentThread().getName(),
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Counter.counter.hashCode(),
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Counter.counter.get().hashCode(),
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Counter.counter.get().toString());
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}
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public void set(String word) {
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Counter.counter.set(new StringBuilder(word));
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System.out.printf("Set, Thread name:%s , ThreadLocal hashcode:%s, Instance hashcode:%s, Value:%s\n",
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Thread.currentThread().getName(),
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Counter.counter.hashCode(),
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Counter.counter.get().hashCode(),
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Counter.counter.get().toString());
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}
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}
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private static class Counter {
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private static ThreadLocal<StringBuilder> counter = new ThreadLocal<StringBuilder>() {
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@Override
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protected StringBuilder initialValue() {
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return new StringBuilder();
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}
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};
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}
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}

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