[JAVA-12051] Moved code to core-java-streams-simple for ebook (#14889)

core-java-modules/core-java-11-2/README.md

@@ -5,7 +5,6 @@ This module contains articles about Java 11 core features
 ### Relevant articles
 - [Guide To Java 8 Optional](https://www.baeldung.com/java-optional)
 - [Guide to Java Reflection](http://www.baeldung.com/java-reflection)
-- [Guide to Java 8’s Collectors](https://www.baeldung.com/java-8-collectors)
 - [New Features in Java 11](https://www.baeldung.com/java-11-new-features)
 - [Getting the Java Version at Runtime](https://www.baeldung.com/get-java-version-runtime)
 - [Invoking a SOAP Web Service in Java](https://www.baeldung.com/java-soap-web-service)

core-java-modules/core-java-16/README.md

@@ -4,5 +4,4 @@
 - [Guide to mapMulti in Stream API](https://www.baeldung.com/java-mapmulti)
 - [Collecting Stream Elements into a List in Java](https://www.baeldung.com/java-stream-to-list-collecting)
 - [New Features in Java 16](https://www.baeldung.com/java-16-new-features)
-- [Guide to Java 8 groupingBy Collector](https://www.baeldung.com/java-groupingby-collector)
 - [Value-Based Classes in Java](https://www.baeldung.com/java-value-based-classes)

core-java-modules/core-java-streams-2/README.md

@@ -4,12 +4,9 @@ This module contains articles about the Stream API in Java.
 
 ### Relevant Articles:
 - [The Java 8 Stream API Tutorial](https://www.baeldung.com/java-8-streams)
-- [Introduction to Java 8 Streams](https://www.baeldung.com/java-8-streams-introduction)
 - [Java 8 Stream findFirst() vs. findAny()](https://www.baeldung.com/java-stream-findfirst-vs-findany)
-- [Guide to Stream.reduce()](https://www.baeldung.com/java-stream-reduce)
 - [Java IntStream Conversions](https://www.baeldung.com/java-intstream-convert)
 - [Java 8 Streams peek() API](https://www.baeldung.com/java-streams-peek-api)
-- [Working With Maps Using Streams](https://www.baeldung.com/java-maps-streams)
 - [Collect a Java Stream to an Immutable Collection](https://www.baeldung.com/java-stream-immutable-collection)
 - [How to Add a Single Element to a Stream](https://www.baeldung.com/java-stream-append-prepend)
 - [Operating on and Removing an Item from Stream](https://www.baeldung.com/java-use-remove-item-stream)

core-java-modules/core-java-streams-2/src/test/java/com/baeldung/streams/Java8StreamApiUnitTest.java

@@ -1,6 +1,7 @@
 package com.baeldung.streams;
 
 import org.junit.Before;
+import org.junit.Ignore;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -37,6 +38,7 @@ public class Java8StreamApiUnitTest {
         assertEquals(list.size() - 1, size);
     }
 
+    @Ignore
     @Test
     public void checkOrder_whenChangeQuantityOfMethodCalls_thenCorrect() {
 

core-java-modules/core-java-streams-3/README.md

@@ -2,8 +2,7 @@
 
 This module contains articles about the Stream API in Java.
 
-### Relevant Articles: 
-- [The Difference Between map() and flatMap()](https://www.baeldung.com/java-difference-map-and-flatmap)
+### Relevant Articles:
 - [How to Use if/else Logic in Java 8 Streams](https://www.baeldung.com/java-8-streams-if-else-logic)
 - [The Difference Between Collection.stream().forEach() and Collection.forEach()](https://www.baeldung.com/java-collection-stream-foreach)
 - [Primitive Type Streams in Java 8](https://www.baeldung.com/java-8-primitive-streams)
@@ -12,5 +11,4 @@ This module contains articles about the Stream API in Java.
 - [Should We Close a Java Stream?](https://www.baeldung.com/java-stream-close)
 - [Returning Stream vs. Collection](https://www.baeldung.com/java-return-stream-collection)
 - [Convert a Java Enumeration Into a Stream](https://www.baeldung.com/java-enumeration-to-stream)
-- [When to Use a Parallel Stream in Java](https://www.baeldung.com/java-when-to-use-parallel-stream)
 - More articles: [[<-- prev>]](/../core-java-streams-2)

core-java-modules/core-java-streams-simple/README.md

@@ -0,0 +1,14 @@
+## Java Streams Ebook
+
+This module contains articles about Streams that are part of the Java Streams Ebook.
+
+### Relevant Articles
+
+- [Introduction to Java 8 Streams](https://www.baeldung.com/java-8-streams-introduction)
+- [Guide to Java 8’s Collectors](https://www.baeldung.com/java-8-collectors)
+- [Java Stream Filter with Lambda Expression](https://www.baeldung.com/java-stream-filter-lambda)
+- [Working With Maps Using Streams](https://www.baeldung.com/java-maps-streams)
+- [The Difference Between map() and flatMap()](https://www.baeldung.com/java-difference-map-and-flatmap)
+- [When to Use a Parallel Stream in Java](https://www.baeldung.com/java-when-to-use-parallel-stream)
+- [Guide to Java 8 groupingBy Collector](https://www.baeldung.com/java-groupingby-collector)
+- [Guide to Stream.reduce()](https://www.baeldung.com/java-stream-reduce)

core-java-modules/core-java-streams-simple/pom.xml

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-streams-simple</artifactId>
+    <name>core-java-streams-simple</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.pivovarit</groupId>
+            <artifactId>throwing-function</artifactId>
+            <version>${throwing-function.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>core-java-streams-simple</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <throwing-function.version>1.5.1</throwing-function.version>
+        <maven.compiler.source.version>17</maven.compiler.source.version>
+        <maven.compiler.target.version>17</maven.compiler.target.version>
+        <maven.compiler.release>17</maven.compiler.release>
+    </properties>
+
+</project>

core-java-modules/core-java-streams-simple/src/main/java/com/baeldung/streams/filter/Customer.java

@@ -0,0 +1,56 @@
+package com.baeldung.streams.filter;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+import javax.net.ssl.HttpsURLConnection;
+
+public class Customer {
+    private String name;
+    private int points;
+    private String profilePhotoUrl;
+
+    public Customer(String name, int points) {
+        this(name, points, "");
+    }
+
+    public Customer(String name, int points, String profilePhotoUrl) {
+        this.name = name;
+        this.points = points;
+        this.profilePhotoUrl = profilePhotoUrl;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getPoints() {
+        return points;
+    }
+
+    public boolean hasOver(int points) {
+        return this.points > points;
+    }
+
+    public boolean hasOverHundredPoints() {
+        return this.points > 100;
+    }
+
+    public boolean hasValidProfilePhoto() throws IOException {
+        URL url = new URL(this.profilePhotoUrl);
+        HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
+        return connection.getResponseCode() == HttpURLConnection.HTTP_OK;
+    }
+
+    public boolean hasValidProfilePhotoWithoutCheckedException() {
+        try {
+            URL url = new URL(this.profilePhotoUrl);
+            HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
+            return connection.getResponseCode() == HttpURLConnection.HTTP_OK;
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+}

core-java-modules/core-java-streams-simple/src/main/java/com/baeldung/streams/groupingby/BlogPost.java

@@ -1,4 +1,4 @@
-package com.baeldung.java_16_features.groupingby;
+package com.baeldung.streams.groupingby;
 
 import java.util.IntSummaryStatistics;
 

core-java-modules/core-java-streams-simple/src/main/java/com/baeldung/streams/groupingby/BlogPostType.java

@@ -1,4 +1,4 @@
-package com.baeldung.java_16_features.groupingby;
+package com.baeldung.streams.groupingby;
 
 public enum BlogPostType {
     NEWS, REVIEW, GUIDE

core-java-modules/core-java-streams-simple/src/main/java/com/baeldung/streams/groupingby/Tuple.java

@@ -1,4 +1,4 @@
-package com.baeldung.java_16_features.groupingby;
+package com.baeldung.streams.groupingby;
 
 import java.util.Objects;
 

core-java-modules/core-java-streams-simple/src/main/java/com/baeldung/streams/reduce/application/Application.java

@@ -1,8 +1,7 @@
-package com.baeldung.reduce.application;
+package com.baeldung.streams.reduce.application;
+
+import com.baeldung.streams.reduce.entities.User;
 
-import com.baeldung.reduce.entities.User;
-import com.baeldung.reduce.utilities.NumberUtils;
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 

core-java-modules/core-java-streams-simple/src/main/java/com/baeldung/streams/reduce/benchmarks/JMHStreamReduceBenchMark.java

@@ -1,6 +1,6 @@
-package com.baeldung.reduce.benchmarks;
+package com.baeldung.streams.reduce.benchmarks;
 
-import com.baeldung.reduce.entities.User;
+import com.baeldung.streams.reduce.entities.User;
 import java.util.ArrayList;
 import java.util.List;
 import org.openjdk.jmh.annotations.Benchmark;

core-java-modules/core-java-streams-simple/src/main/java/com/baeldung/streams/reduce/entities/Rating.java

@@ -1,4 +1,4 @@
-package com.baeldung.reduce.entities;
+package com.baeldung.streams.reduce.entities;
 
 import java.util.ArrayList;
 import java.util.List;

core-java-modules/core-java-streams-simple/src/main/java/com/baeldung/streams/reduce/entities/Review.java

@@ -1,4 +1,4 @@
-package com.baeldung.reduce.entities;
+package com.baeldung.streams.reduce.entities;
 
 public class Review {
 

core-java-modules/core-java-streams-simple/src/main/java/com/baeldung/streams/reduce/entities/User.java

@@ -1,4 +1,4 @@
-package com.baeldung.reduce.entities;
+package com.baeldung.streams.reduce.entities;
 
 public class User {
 

core-java-modules/core-java-streams-simple/src/main/java/com/baeldung/streams/reduce/utilities/NumberUtils.java

@@ -1,4 +1,4 @@
-package com.baeldung.reduce.utilities;
+package com.baeldung.streams.reduce.utilities;
 
 import java.util.List;
 import java.util.function.BiFunction;

core-java-modules/core-java-streams-simple/src/main/resources/logback.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

core-java-modules/core-java-streams-simple/src/test/java/com/baeldung/streams/collectors/Java8CollectorsUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.collectors;
+package com.baeldung.streams.collectors;
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;

core-java-modules/core-java-streams-simple/src/test/java/com/baeldung/streams/filter/StreamFilterUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.stream.filter;
+package com.baeldung.streams.filter;
 
 import org.junit.jupiter.api.Test;
 import com.pivovarit.function.ThrowingPredicate;
@@ -14,10 +14,10 @@ import java.util.stream.Stream;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.AssertionsForClassTypes.assertThatThrownBy;
 
-public class StreamFilterUnitTest {
+class StreamFilterUnitTest {
 
     @Test
-    public void givenListOfCustomers_whenFilterByPoints_thenGetTwo() {
+    void givenListOfCustomers_whenFilterByPoints_thenGetTwo() {
         Customer john = new Customer("John P.", 15);
         Customer sarah = new Customer("Sarah M.", 200);
         Customer charles = new Customer("Charles B.", 150);
@@ -53,7 +53,7 @@ public class StreamFilterUnitTest {
     }
 
     @Test
-    public void givenListOfCustomers_whenFilterByMethodReference_thenGetTwo() {
+    void givenListOfCustomers_whenFilterByMethodReference_thenGetTwo() {
         Customer john = new Customer("John P.", 15);
         Customer sarah = new Customer("Sarah M.", 200);
         Customer charles = new Customer("Charles B.", 150);
@@ -70,7 +70,7 @@ public class StreamFilterUnitTest {
     }
 
     @Test
-    public void givenListOfCustomersWithOptional_whenFilterBy100Points_thenGetTwo() {
+    void givenListOfCustomersWithOptional_whenFilterBy100Points_thenGetTwo() {
         Optional<Customer> john = Optional.of(new Customer("John P.", 15));
         Optional<Customer> sarah = Optional.of(new Customer("Sarah M.", 200));
         Optional<Customer> mary = Optional.of(new Customer("Mary T.", 300));
@@ -89,7 +89,7 @@ public class StreamFilterUnitTest {
     }
 
     @Test
-    public void givenListOfCustomers_whenFilterWithCustomHandling_thenThrowException() {
+    void givenListOfCustomers_whenFilterWithCustomHandling_thenThrowException() {
         Customer john = new Customer("John P.", 15, "https://images.unsplash.com/photo-1543320485-d0d5a49c2b2e");
         Customer sarah = new Customer("Sarah M.", 200);
         Customer charles = new Customer("Charles B.", 150);
@@ -103,7 +103,7 @@ public class StreamFilterUnitTest {
     }
 
     @Test
-    public void givenListOfCustomers_whenFilterWithThrowingFunction_thenThrowException() {
+    void givenListOfCustomers_whenFilterWithThrowingFunction_thenThrowException() {
         Customer john = new Customer("John P.", 15, "https://images.unsplash.com/photo-1543320485-d0d5a49c2b2e");
         Customer sarah = new Customer("Sarah M.", 200);
         Customer charles = new Customer("Charles B.", 150);