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Add two new modules: <module>core-java-11-2</module> to project
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‎core-java-modules/core-java-11-2/README.md‎

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## Core Java 11
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This module contains articles about Java 11 core features
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### Relevant articles
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- [Guide to Java 8 Optional](https://www.baeldung.com/java-optional)
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- [Guide to Java Reflection](http://www.baeldung.com/java-reflection)
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- [Guide to Java 8’s Collectors](https://www.baeldung.com/java-8-collectors)
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- [New Features in Java 11](https://www.baeldung.com/java-11-new-features)
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- [Getting the Java Version at Runtime](https://www.baeldung.com/get-java-version-runtime)
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- [Invoking a SOAP Web Service in Java](https://www.baeldung.com/java-soap-web-service)
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- [Java HTTPS Client Certificate Authentication](https://www.baeldung.com/java-https-client-certificate-authentication)
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- [Call Methods at Runtime Using Java Reflection](https://www.baeldung.com/java-method-reflection)

‎core-java-modules/core-java-11-2/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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<artifactId>core-java-11-2</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>core-java-11-2</name>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.ossez.core-java-modules</groupId>
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<artifactId>core-java-modules</artifactId>
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<version>0.0.2-SNAPSHOT</version>
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</parent>
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<dependencies>
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<dependency>
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<groupId>com.google.guava</groupId>
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<artifactId>guava</artifactId>
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<version>${guava.version}</version>
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</dependency>
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<dependency>
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<groupId>org.mock-server</groupId>
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<artifactId>mockserver-junit-jupiter</artifactId>
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<version>${mockserver.version}</version>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<version>${commons-lang3.version}</version>
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</dependency>
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<dependency>
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<groupId>jakarta.xml.ws</groupId>
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<artifactId>jakarta.xml.ws-api</artifactId>
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<version>${jakarta.ws-api.version}</version>
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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.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>${maven-compiler-plugin.version}</version>
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<configuration>
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<source>${maven.compiler.source.version}</source>
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<target>${maven.compiler.target.version}</target>
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</configuration>
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</plugin>
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<!-- jax-ws maven plugin -->
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<plugin>
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<groupId>com.sun.xml.ws</groupId>
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<artifactId>jaxws-maven-plugin</artifactId>
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<version>${jaxws-maven-plugin.version}</version>
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<configuration>
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<wsdlUrls>
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<wsdlUrl>http://localhost:8888/ws/country?wsdl</wsdlUrl>
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</wsdlUrls>
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<keep>true</keep>
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<packageName>com.baeldung.soap.ws.client.generated</packageName>
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<sourceDestDir>src/main/java</sourceDestDir>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<properties>
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<maven.compiler.source.version>11</maven.compiler.source.version>
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<maven.compiler.target.version>11</maven.compiler.target.version>
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<mockserver.version>5.11.1</mockserver.version>
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<jakarta.ws-api.version>3.0.1</jakarta.ws-api.version>
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<jaxws-maven-plugin.version>3.0.2</jaxws-maven-plugin.version>
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</properties>
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</project>

‎core-java-modules/core-java-11-2/src/main/java/com/baeldung/features/MainClass.java‎

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package com.baeldung.features;
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public class MainClass {
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private static boolean mainPrivateMethod() {
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return true;
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}
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public static class NestedClass {
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boolean nestedPublicMethod() {
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return mainPrivateMethod();
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}
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}
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}

‎core-java-modules/core-java-11-2/src/main/java/com/baeldung/httpsclientauthentication/SSLScocketClient.java‎

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package com.baeldung.httpsclientauthentication;
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import javax.net.SocketFactory;
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import javax.net.ssl.SSLSocket;
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import javax.net.ssl.SSLSocketFactory;
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public class SSLScocketClient {
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static void startClient(String host, int port) throws IOException {
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SocketFactory factory = SSLSocketFactory.getDefault();
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try (SSLSocket socket = (SSLSocket) factory.createSocket(host, port)) {
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socket.setEnabledCipherSuites(new String[] { "TLS_AES_128_GCM_SHA256" });
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socket.setEnabledProtocols(new String[] { "TLSv1.3" });
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InputStream is = new BufferedInputStream(socket.getInputStream());
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String message = "Hello World Message";
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System.out.println("sending message: " + message);
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OutputStream os = new BufferedOutputStream(socket.getOutputStream());
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os.write(message.getBytes());
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os.flush();
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byte[] data = new byte[2048];
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int len = is.read(data);
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if (len <= 0) {
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throw new IOException("no data received");
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}
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System.out.printf("client received %d bytes: %s%n", len, new String(data, 0, len));
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}
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}
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public static void main(String[] args) throws IOException {
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startClient("localhost", 8443);
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}
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}

‎core-java-modules/core-java-11-2/src/main/java/com/baeldung/httpsclientauthentication/SSLSocketEchoServer.java‎

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package com.baeldung.httpsclientauthentication;
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.net.Socket;
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import javax.net.ServerSocketFactory;
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import javax.net.ssl.SSLServerSocket;
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import javax.net.ssl.SSLServerSocketFactory;
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public class SSLSocketEchoServer {
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static void startServer(int port) throws IOException {
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ServerSocketFactory factory = SSLServerSocketFactory.getDefault();
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try (SSLServerSocket listener = (SSLServerSocket) factory.createServerSocket(port)) {
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listener.setNeedClientAuth(true);
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listener.setEnabledCipherSuites(new String[] { "TLS_AES_128_GCM_SHA256" });
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listener.setEnabledProtocols(new String[] { "TLSv1.3" });
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System.out.println("listening for messages...");
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try (Socket socket = listener.accept()) {
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InputStream is = new BufferedInputStream(socket.getInputStream());
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OutputStream os = new BufferedOutputStream(socket.getOutputStream());
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byte[] data = new byte[2048];
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int len = is.read(data);
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if (len <= 0) {
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throw new IOException("no data received");
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}
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String message = new String(data, 0, len);
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System.out.printf("server received %d bytes: %s%n", len, message);
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String response = message + " processed by server";
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os.write(response.getBytes(), 0, response.getBytes().length);
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os.flush();
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}
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System.out.println("message processed, exiting");
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}
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}
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public static void main(String[] args) throws IOException {
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startServer(8443);
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}
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}

‎core-java-modules/core-java-11-2/src/main/java/com/baeldung/optional/Modem.java‎

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package com.baeldung.optional;
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public class Modem {
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private Double price;
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public Modem(Double price) {
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this.price = price;
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}
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public Double getPrice() {
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return price;
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}
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}

‎core-java-modules/core-java-11-2/src/main/java/com/baeldung/optional/Person.java‎

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package com.baeldung.optional;
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import java.util.List;
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import java.util.Optional;
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import java.util.stream.Collectors;
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public class Person {
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private String name;
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private int age;
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private String password;
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public Person(String name, int age) {
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this.name = name;
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this.age = age;
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}
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public Optional<String> getName() {
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return Optional.ofNullable(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 Optional<Integer> getAge() {
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return Optional.of(age);
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}
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public void setAge(int age) {
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this.age = age;
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}
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public void setPassword(String password) {
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this.password = password;
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}
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public Optional<String> getPassword() {
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return Optional.ofNullable(password);
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}
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public static List<Person> search(List<Person> people, String name, Optional<Integer> age) {
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// Null checks for people and name
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return people.stream()
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.filter(p -> p.getName().equals(name))
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.filter(p -> p.getAge().get() >= age.orElse(0))
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.collect(Collectors.toList());
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}
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public static List<Person> search(List<Person> people, String name, Integer age) {
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// Null checks for people and name
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final Integer ageFilter = age != null ? age : 0;
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return people.stream()
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.filter(p -> p.getName().equals(name))
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.filter(p -> p.getAge().get() >= ageFilter)
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.collect(Collectors.toList());
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}
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public static List<Person> search(List<Person> people, String name) {
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return doSearch(people, name, 0);
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}
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public static List<Person> search(List<Person> people, String name, int age) {
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return doSearch(people, name, age);
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}
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private static List<Person> doSearch(List<Person> people, String name, int age) {
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// Null checks for people and name
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return people.stream()
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.filter(p -> p.getName().equals(name))
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.filter(p -> p.getAge().get().intValue() >= age)
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.collect(Collectors.toList());
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}
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}

‎core-java-modules/core-java-11-2/src/main/java/com/baeldung/reflection/Animal.java‎

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package com.baeldung.reflection;
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public abstract class Animal implements Eating {
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public static final String CATEGORY = "domestic";
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private String name;
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public Animal(String name) {
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this.name = name;
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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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protected abstract String getSound();
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}

‎core-java-modules/core-java-11-2/src/main/java/com/baeldung/reflection/Bird.java‎

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package com.baeldung.reflection;
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public class Bird extends Animal {
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private boolean walks;
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public Bird() {
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super("bird");
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}
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public Bird(String name, boolean walks) {
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super(name);
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setWalks(walks);
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}
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public Bird(String name) {
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super(name);
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}
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@Override
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public String eats() {
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return "grains";
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}
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@Override
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protected String getSound() {
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return "chaps";
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}
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public boolean walks() {
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return walks;
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}
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public void setWalks(boolean walks) {
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this.walks = walks;
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}
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}

‎core-java-modules/core-java-11-2/src/main/java/com/baeldung/reflection/DynamicGreeter.java‎

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package com.baeldung.reflection;
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import java.lang.annotation.Annotation;
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public class DynamicGreeter implements Greeter {
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private String greet;
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public DynamicGreeter(String greet) {
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this.greet = greet;
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}
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@Override
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public Class<? extends Annotation> annotationType() {
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return DynamicGreeter.class;
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}
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@Override
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public String greet() {
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return greet;
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}
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}

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