Merge pull request #1 from eugenp/master

Update from original

README.md

@@ -1,8 +1,8 @@
 
 The "REST with Spring" Classes
 ==============================
-This is what I'm working on: <br/>
-**[>> THE REST WITH SPRING CLASSES](http://www.baeldung.com/rest-with-spring-course?utm_source=github&utm_medium=social&utm_content=tutorials&utm_campaign=25off)**
+After 5 months of work, here's the Master Class: <br/>
+**[>> THE REST WITH SPRING MASTER CLASS](http://www.baeldung.com/rest-with-spring-course?utm_source=github&utm_medium=social&utm_content=tutorials&utm_campaign=rws#master-class)**
 
 
 Spring Tutorials

RestEasy Example/pom.xml

@@ -0,0 +1,77 @@
+<?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>
+
+	<groupId>com.baeldung</groupId>
+	<artifactId>resteasy-tutorial</artifactId>
+	<version>1.0</version>
+	<packaging>war</packaging>
+
+	<properties>
+		<resteasy.version>3.0.14.Final</resteasy.version>
+	</properties>
+
+	<build>
+		<finalName>RestEasyTutorial</finalName>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<configuration>
+					<source>1.8</source>
+					<target>1.8</target>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+	<dependencies>
+
+		<!-- core library -->
+
+		<dependency>
+			<groupId>org.jboss.resteasy</groupId>
+			<artifactId>resteasy-servlet-initializer</artifactId>
+			<version>${resteasy.version}</version>
+		</dependency>
+
+
+		<dependency>
+			<groupId>org.jboss.resteasy</groupId>
+			<artifactId>resteasy-client</artifactId>
+			<version>${resteasy.version}</version>
+		</dependency>
+
+		<!-- Optional library -->
+
+		<dependency>
+			<groupId>org.jboss.resteasy</groupId>
+			<artifactId>resteasy-jaxb-provider</artifactId>
+			<version>${resteasy.version}</version>
+		</dependency>
+
+		<dependency>
+			<groupId>org.jboss.resteasy</groupId>
+			<artifactId>resteasy-jackson-provider</artifactId>
+			<version>${resteasy.version}</version>
+		</dependency>
+
+		<!-- Junit Library -->
+
+		<dependency>
+			<groupId>junit</groupId>
+			<artifactId>junit</artifactId>
+			<version>4.4</version>
+		</dependency>
+
+		<dependency>
+			<groupId>commons-io</groupId>
+			<artifactId>commons-io</artifactId>
+			<version>2.4</version>
+		</dependency>
+
+	</dependencies>
+
+
+</project>

RestEasy Example/src/main/java/com/baeldung/client/ServicesInterface.java

@@ -0,0 +1,36 @@
+package com.baeldung.client;
+
+import com.baeldung.model.Movie;
+import javax.ws.rs.*;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import java.util.List;
+
+@Path("/movies")
+public interface ServicesInterface {
+
+    @GET
+    @Path("/getinfo")
+    @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
+    Movie movieByImdbId(@QueryParam("imdbId") String imdbId);
+
+    @GET
+    @Path("/listmovies")
+    @Produces({ "application/json" })
+    List<Movie> listMovies();
+
+    @POST
+    @Path("/addmovie")
+    @Consumes({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
+    Response addMovie(Movie movie);
+
+    @PUT
+    @Path("/updatemovie")
+    @Consumes({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
+    Response updateMovie(Movie movie);
+
+    @DELETE
+    @Path("/deletemovie")
+    Response deleteMovie(@QueryParam("imdbId") String imdbID);
+
+}

RestEasy Example/src/main/java/com/baeldung/model/Movie.java

@@ -0,0 +1,66 @@
+package com.baeldung.model;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlType;
+
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "movie", propOrder = { "imdbId", "title" })
+public class Movie {
+
+    protected String imdbId;
+    protected String title;
+
+    public Movie(String imdbId, String title) {
+        this.imdbId = imdbId;
+        this.title = title;
+    }
+
+    public Movie() {}
+
+    public String getImdbId() {
+        return imdbId;
+    }
+
+    public void setImdbId(String imdbId) {
+        this.imdbId = imdbId;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+
+        Movie movie = (Movie) o;
+
+        if (imdbId != null ? !imdbId.equals(movie.imdbId) : movie.imdbId != null)
+            return false;
+        return title != null ? title.equals(movie.title) : movie.title == null;
+
+    }
+
+    @Override
+    public int hashCode() {
+        int result = imdbId != null ? imdbId.hashCode() : 0;
+        result = 31 * result + (title != null ? title.hashCode() : 0);
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        return "Movie{" +
+                "imdbId='" + imdbId + '\'' +
+                ", title='" + title + '\'' +
+                '}';
+    }
+}

RestEasy Example/src/main/java/com/baeldung/server/MovieCrudService.java

@@ -0,0 +1,83 @@
+package com.baeldung.server;
+
+import com.baeldung.model.Movie;
+import javax.ws.rs.*;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+@Path("/movies")
+public class MovieCrudService {
+
+    private Map<String, Movie> inventory = new HashMap<String, Movie>();
+
+    @GET
+    @Path("/getinfo")
+    @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
+    public Movie movieByImdbId(@QueryParam("imdbId") String imdbId) {
+
+        System.out.println("*** Calling  getinfo for a given ImdbID***");
+
+        if (inventory.containsKey(imdbId)) {
+            return inventory.get(imdbId);
+        } else
+            return null;
+    }
+
+    @POST
+    @Path("/addmovie")
+    @Consumes({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
+    public Response addMovie(Movie movie) {
+
+        System.out.println("*** Calling  addMovie ***");
+
+        if (null != inventory.get(movie.getImdbId())) {
+            return Response.status(Response.Status.NOT_MODIFIED).entity("Movie is Already in the database.").build();
+        }
+
+        inventory.put(movie.getImdbId(), movie);
+        return Response.status(Response.Status.CREATED).build();
+    }
+
+    @PUT
+    @Path("/updatemovie")
+    @Consumes({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
+    public Response updateMovie(Movie movie) {
+
+        System.out.println("*** Calling  updateMovie ***");
+
+        if (null == inventory.get(movie.getImdbId())) {
+            return Response.status(Response.Status.NOT_MODIFIED).entity("Movie is not in the database.\nUnable to Update").build();
+        }
+
+        inventory.put(movie.getImdbId(), movie);
+        return Response.status(Response.Status.OK).build();
+    }
+
+    @DELETE
+    @Path("/deletemovie")
+    public Response deleteMovie(@QueryParam("imdbId") String imdbId) {
+
+        System.out.println("*** Calling  deleteMovie ***");
+
+        if (null == inventory.get(imdbId)) {
+            return Response.status(Response.Status.NOT_FOUND).entity("Movie is not in the database.\nUnable to Delete").build();
+        }
+
+        inventory.remove(imdbId);
+        return Response.status(Response.Status.OK).build();
+    }
+
+    @GET
+    @Path("/listmovies")
+    @Produces({ "application/json" })
+    public List<Movie> listMovies() {
+
+        return inventory.values().stream().collect(Collectors.toCollection(ArrayList::new));
+    }
+
+}

RestEasy Example/src/main/java/com/baeldung/server/RestEasyServices.java

@@ -0,0 +1,32 @@
+package com.baeldung.server;
+
+import javax.ws.rs.ApplicationPath;
+import javax.ws.rs.core.Application;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+@ApplicationPath("/rest")
+public class RestEasyServices extends Application {
+
+    private Set<Object> singletons = new HashSet<Object>();
+
+    public RestEasyServices() {
+        singletons.add(new MovieCrudService());
+    }
+
+    @Override
+    public Set<Object> getSingletons() {
+        return singletons;
+    }
+
+    @Override
+    public Set<Class<?>> getClasses() {
+        return super.getClasses();
+    }
+
+    @Override
+    public Map<String, Object> getProperties() {
+        return super.getProperties();
+    }
+}

RestEasy Example/src/main/webapp/WEB-INF/classes/logback.xml

@@ -0,0 +1,3 @@
+<configuration scan="true" scanPeriod="10 seconds">
+
+</configuration>

RestEasy Example/src/main/webapp/WEB-INF/jboss-deployment-structure.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<jboss-deployment-structure>
+    <deployment>
+        <exclude-subsystems>
+            <subsystem name="resteasy"/>
+        </exclude-subsystems>
+        <exclusions>
+            <module name="javaee.api"/><module name="javax.ws.rs.api"/>
+            <module name="org.jboss.resteasy.resteasy-jaxrs"/>
+        </exclusions>
+        <local-last value="true"/>
+    </deployment>
+</jboss-deployment-structure>

RestEasy Example/src/main/webapp/WEB-INF/jboss-web.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE jboss-web PUBLIC "-//JBoss//DTD Web Application 4.2//EN" "http://www.jboss.org/j2ee/dtd/jboss-web_4_2.dtd">
+<jboss-web>
+</jboss-web>

RestEasy Example/src/main/webapp/WEB-INF/web.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
+
+	<display-name>RestEasy Example</display-name>
+
+	<context-param>
+		<param-name>resteasy.servlet.mapping.prefix</param-name>
+		<param-value>/rest</param-value>
+	</context-param>
+
+</web-app>

apache-fop/pom.xml

@@ -37,7 +37,7 @@
 
 		<dependency>
 			<groupId>junit</groupId>
-			<artifactId>junit-dep</artifactId>
+			<artifactId>junit</artifactId>
 			<version>${junit.version}</version>
 			<scope>test</scope>
 		</dependency>
@@ -151,7 +151,7 @@
 		<mysql-connector-java.version>5.1.34</mysql-connector-java.version>
 
 		<!-- marshalling -->
-		<jackson.version>2.4.4</jackson.version>
+		<jackson.version>2.5.5</jackson.version>
 
 		<!-- logging -->
 		<org.slf4j.version>1.7.9</org.slf4j.version>
@@ -166,7 +166,7 @@
 
 		<!-- testing -->
 		<org.hamcrest.version>1.3</org.hamcrest.version>
-		<junit.version>4.11</junit.version>
+		<junit.version>4.12</junit.version>
 		<mockito.version>1.10.19</mockito.version>
 
 		<httpcore.version>4.4</httpcore.version>

core-java-8/.settings/org.eclipse.jdt.core.prefs

@@ -1,4 +1,5 @@
 eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.annotation.inheritNullAnnotations=disabled
 org.eclipse.jdt.core.compiler.annotation.missingNonNullByDefaultAnnotation=ignore
 org.eclipse.jdt.core.compiler.annotation.nonnull=org.eclipse.jdt.annotation.NonNull
 org.eclipse.jdt.core.compiler.annotation.nonnullbydefault=org.eclipse.jdt.annotation.NonNullByDefault
@@ -26,7 +27,7 @@ org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
 org.eclipse.jdt.core.compiler.problem.explicitlyClosedAutoCloseable=ignore
 org.eclipse.jdt.core.compiler.problem.fallthroughCase=ignore
 org.eclipse.jdt.core.compiler.problem.fatalOptionalError=disabled
-org.eclipse.jdt.core.compiler.problem.fieldHiding=error
+org.eclipse.jdt.core.compiler.problem.fieldHiding=warning
 org.eclipse.jdt.core.compiler.problem.finalParameterBound=warning
 org.eclipse.jdt.core.compiler.problem.finallyBlockNotCompletingNormally=warning
 org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
@@ -35,7 +36,7 @@ org.eclipse.jdt.core.compiler.problem.includeNullInfoFromAsserts=disabled
 org.eclipse.jdt.core.compiler.problem.incompatibleNonInheritedInterfaceMethod=warning
 org.eclipse.jdt.core.compiler.problem.incompleteEnumSwitch=ignore
 org.eclipse.jdt.core.compiler.problem.indirectStaticAccess=ignore
-org.eclipse.jdt.core.compiler.problem.localVariableHiding=error
+org.eclipse.jdt.core.compiler.problem.localVariableHiding=warning
 org.eclipse.jdt.core.compiler.problem.methodWithConstructorName=warning
 org.eclipse.jdt.core.compiler.problem.missingDefaultCase=ignore
 org.eclipse.jdt.core.compiler.problem.missingDeprecatedAnnotation=ignore
@@ -48,6 +49,7 @@ org.eclipse.jdt.core.compiler.problem.missingSynchronizedOnInheritedMethod=ignor
 org.eclipse.jdt.core.compiler.problem.noEffectAssignment=warning
 org.eclipse.jdt.core.compiler.problem.noImplicitStringConversion=warning
 org.eclipse.jdt.core.compiler.problem.nonExternalizedStringLiteral=ignore
+org.eclipse.jdt.core.compiler.problem.nonnullParameterAnnotationDropped=warning
 org.eclipse.jdt.core.compiler.problem.nullAnnotationInferenceConflict=error
 org.eclipse.jdt.core.compiler.problem.nullReference=warning
 org.eclipse.jdt.core.compiler.problem.nullSpecViolation=error
@@ -68,6 +70,7 @@ org.eclipse.jdt.core.compiler.problem.specialParameterHidingField=disabled
 org.eclipse.jdt.core.compiler.problem.staticAccessReceiver=warning
 org.eclipse.jdt.core.compiler.problem.suppressOptionalErrors=disabled
 org.eclipse.jdt.core.compiler.problem.suppressWarnings=enabled
+org.eclipse.jdt.core.compiler.problem.syntacticNullAnalysisForFields=disabled
 org.eclipse.jdt.core.compiler.problem.syntheticAccessEmulation=ignore
 org.eclipse.jdt.core.compiler.problem.typeParameterHiding=error
 org.eclipse.jdt.core.compiler.problem.unavoidableGenericTypeProblems=enabled
@@ -82,6 +85,7 @@ org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownException=ignore
 org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownExceptionExemptExceptionAndThrowable=enabled
 org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownExceptionIncludeDocCommentReference=enabled
 org.eclipse.jdt.core.compiler.problem.unusedDeclaredThrownExceptionWhenOverriding=disabled
+org.eclipse.jdt.core.compiler.problem.unusedExceptionParameter=ignore
 org.eclipse.jdt.core.compiler.problem.unusedImport=warning
 org.eclipse.jdt.core.compiler.problem.unusedLabel=warning
 org.eclipse.jdt.core.compiler.problem.unusedLocal=warning
@@ -91,6 +95,7 @@ org.eclipse.jdt.core.compiler.problem.unusedParameterIncludeDocCommentReference=
 org.eclipse.jdt.core.compiler.problem.unusedParameterWhenImplementingAbstract=disabled
 org.eclipse.jdt.core.compiler.problem.unusedParameterWhenOverridingConcrete=disabled
 org.eclipse.jdt.core.compiler.problem.unusedPrivateMember=warning
+org.eclipse.jdt.core.compiler.problem.unusedTypeParameter=ignore
 org.eclipse.jdt.core.compiler.problem.unusedWarningToken=warning
 org.eclipse.jdt.core.compiler.problem.varargsArgumentNeedCast=warning
 org.eclipse.jdt.core.compiler.source=1.8

core-java-8/README.md

@@ -3,4 +3,8 @@
 ## Core Java 8 Cookbooks and Examples
 
 ### Relevant Articles: 
-// - [Java 8 – Powerful Comparison with Lambdas](http://www.baeldung.com/java-8-sort-lambda)
+// - [Java 8 – Powerful Comparison with Lambdas](http://www.baeldung.com/java-8-sort-lambda)
+- [Java – Directory Size](http://www.baeldung.com/java-folder-size)
+- [Java – Try with Resources](http://www.baeldung.com/java-try-with-resources)
+- [Lambda Expressions and Functional Interfaces: Tips and Best Practices](http://www.baeldung.com/java-8-lambda-expressions-tips)
+- [The Double Colon Operator in Java 8](http://www.baeldung.com/java-8-double-colon-operator)

core-java-8/pom.xml

@@ -98,14 +98,14 @@
 
     <properties>
         <!-- logging -->
-        <org.slf4j.version>1.7.12</org.slf4j.version>
+        <org.slf4j.version>1.7.13</org.slf4j.version>
         <logback.version>1.0.13</logback.version>
 
         <!-- various -->
         <hibernate-validator.version>5.1.3.Final</hibernate-validator.version>
 
         <!-- util -->
-        <guava.version>18.0</guava.version>
+        <guava.version>19.0</guava.version>
         <commons-lang3.version>3.4</commons-lang3.version>
 
         <!-- testing -->

core-java-8/src/main/java/com/baeldung/Adder.java

@@ -0,0 +1,12 @@
+package com.baeldung;
+
+import java.util.function.Consumer;
+import java.util.function.Function;
+
+public interface Adder {
+
+    String addWithFunction(Function<String, String> f);
+
+    void addWithConsumer(Consumer<Integer> f);
+
+}

core-java-8/src/main/java/com/baeldung/AdderImpl.java

@@ -0,0 +1,17 @@
+package com.baeldung;
+
+import java.util.function.Consumer;
+import java.util.function.Function;
+
+public class AdderImpl implements Adder {
+
+    @Override
+    public String addWithFunction(final Function<String, String> f) {
+        return f.apply("Something ");
+    }
+
+    @Override
+    public void addWithConsumer(final Consumer<Integer> f) {
+    }
+
+}

core-java-8/src/main/java/com/baeldung/Bar.java

@@ -0,0 +1,12 @@
+package com.baeldung;
+
+@FunctionalInterface
+public interface Bar {
+
+    String method(String string);
+
+    default String defaultMethod() {
+        return "String from Bar";
+    }
+
+}

core-java-8/src/main/java/com/baeldung/Baz.java

@@ -0,0 +1,11 @@
+package com.baeldung;
+
+@FunctionalInterface
+public interface Baz {
+
+    String method(String string);
+
+    default String defaultMethod() {
+        return "String from Baz";
+    }
+}

core-java-8/src/main/java/com/baeldung/Foo.java

@@ -0,0 +1,10 @@
+package com.baeldung;
+
+@FunctionalInterface
+public interface Foo {
+
+    String method(String string);
+
+    default void defaultMethod() {
+    }
+}

core-java-8/src/main/java/com/baeldung/FooExtended.java

@@ -0,0 +1,11 @@
+package com.baeldung;
+
+@FunctionalInterface
+public interface FooExtended extends Baz, Bar {
+
+    @Override
+    default String defaultMethod() {
+        return Bar.super.defaultMethod();
+    }
+
+}

core-java-8/src/main/java/com/baeldung/UseFoo.java

@@ -0,0 +1,37 @@
+package com.baeldung;
+
+import java.util.function.Function;
+
+public class UseFoo {
+
+    private String value = "Enclosing scope value";
+
+    public String add(final String string, final Foo foo) {
+        return foo.method(string);
+    }
+
+    public String addWithStandardFI(final String string, final Function<String, String> fn) {
+        return fn.apply(string);
+    }
+
+    public String scopeExperiment() {
+        final Foo fooIC = new Foo() {
+            String value = "Inner class value";
+
+            @Override
+            public String method(final String string) {
+                return value;
+            }
+        };
+        final String resultIC = fooIC.method("");
+
+        final Foo fooLambda = parameter -> {
+            final String value = "Lambda value";
+            return this.value;
+        };
+        final String resultLambda = fooLambda.method("");
+
+        return "Results: resultIC = " + resultIC + ", resultLambda = " + resultLambda;
+    }
+
+}

core-java-8/src/main/java/com/baeldung/doublecolon/Computer.java

@@ -0,0 +1,88 @@
+package com.baeldung.doublecolon;
+
+public class Computer {
+
+    private Integer age;
+    private String color;
+    private Integer healty;
+
+    public Computer(final int age, final String color) {
+        this.age = age;
+        this.color = color;
+    }
+
+    public Computer(final Integer age, final String color, final Integer healty) {
+        this.age = age;
+        this.color = color;
+        this.healty = healty;
+    }
+
+    public Computer() {
+    }
+
+    public Integer getAge() {
+        return age;
+    }
+
+    public void setAge(final Integer age) {
+        this.age = age;
+    }
+
+    public String getColor() {
+        return color;
+    }
+
+    public void setColor(final String color) {
+        this.color = color;
+    }
+
+    public Integer getHealty() {
+        return healty;
+    }
+
+    public void setHealty(final Integer healty) {
+        this.healty = healty;
+    }
+
+    public void turnOnPc() {
+        System.out.println("Computer turned on");
+    }
+
+    public void turnOffPc() {
+        System.out.println("Computer turned off");
+    }
+
+    public Double calculateValue(Double initialValue) {
+        return initialValue / 1.50;
+    }
+
+    @Override
+    public String toString() {
+        return "Computer{" + "age=" + age + ", color='" + color + '\'' + ", healty=" + healty + '}';
+    }
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        final Computer computer = (Computer) o;
+
+        if (age != null ? !age.equals(computer.age) : computer.age != null) {
+            return false;
+        }
+        return color != null ? color.equals(computer.color) : computer.color == null;
+
+    }
+
+    @Override
+    public int hashCode() {
+        int result = age != null ? age.hashCode() : 0;
+        result = 31 * result + (color != null ? color.hashCode() : 0);
+        return result;
+    }
+}

core-java-8/src/main/java/com/baeldung/doublecolon/ComputerUtils.java

@@ -0,0 +1,27 @@
+package com.baeldung.doublecolon;
+
+import com.baeldung.doublecolon.function.ComputerPredicate;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ComputerUtils {
+
+    public static final ComputerPredicate after2010Predicate = (c) -> (c.getAge() > 2010);
+    public static final ComputerPredicate blackPredicate = (c) -> "black".equals(c.getColor());
+
+    public static List<Computer> filter(final List<Computer> inventory, final ComputerPredicate p) {
+
+        final List<Computer> result = new ArrayList<>();
+        inventory.stream().filter(p::filter).forEach(result::add);
+
+        return result;
+    }
+
+    public static void repair(final Computer computer) {
+        if (computer.getHealty() < 50) {
+            computer.setHealty(100);
+        }
+    }
+
+}

core-java-8/src/main/java/com/baeldung/doublecolon/MacbookPro.java

@@ -0,0 +1,34 @@
+package com.baeldung.doublecolon;
+
+import java.util.function.Function;
+
+public class MacbookPro extends Computer {
+
+    public MacbookPro(int age, String color) {
+        super(age, color);
+    }
+
+    public MacbookPro(Integer age, String color, Integer healty) {
+        super(age, color, healty);
+    }
+
+    @Override
+    public void turnOnPc() {
+        System.out.println("MacbookPro turned on");
+    }
+
+    @Override
+    public void turnOffPc() {
+        System.out.println("MacbookPro turned off");
+    }
+
+    @Override
+    public Double calculateValue(Double initialValue) {
+
+        Function<Double, Double> function = super::calculateValue;
+        final Double pcValue = function.apply(initialValue);
+        System.out.println("First value is:" + pcValue);
+        return pcValue + (initialValue / 10);
+
+    }
+}

core-java-8/src/main/java/com/baeldung/doublecolon/function/ComputerPredicate.java

@@ -0,0 +1,10 @@
+package com.baeldung.doublecolon.function;
+
+import com.baeldung.doublecolon.Computer;
+
+@FunctionalInterface
+public interface ComputerPredicate {
+
+    boolean filter(Computer c);
+
+}

core-java-8/src/main/java/com/baeldung/doublecolon/function/TriFunction.java

@@ -0,0 +1,15 @@
+package com.baeldung.doublecolon.function;
+
+import java.util.Objects;
+import java.util.function.Function;
+
+@FunctionalInterface
+public interface TriFunction<A, B, C, R> {
+
+    R apply(A a, B b, C c);
+
+    default <V> TriFunction<A, B, C, V> andThen(final Function<? super R, ? extends V> after) {
+        Objects.requireNonNull(after);
+        return (final A a, final B b, final C c) -> after.apply(apply(a, b, c));
+    }
+}

core-java-8/src/test/java/com/baeldung/doublecolon/TestComputerUtils.java

@@ -0,0 +1,89 @@
+package com.baeldung.doublecolon;
+
+import com.baeldung.doublecolon.function.TriFunction;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.*;
+import java.util.function.BiFunction;
+
+import static com.baeldung.doublecolon.ComputerUtils.*;
+
+public class TestComputerUtils {
+
+    @Before
+    public void setup() {
+    }
+
+    @After
+    public void tearDown() {
+    }
+
+    @Test
+    public void testConstructorReference() {
+
+        Computer c1 = new Computer(2015, "white");
+        Computer c2 = new Computer(2009, "black");
+        Computer c3 = new Computer(2014, "black");
+
+        BiFunction<Integer, String, Computer> c4Function = Computer::new;
+        Computer c4 = c4Function.apply(2013, "white");
+        BiFunction<Integer, String, Computer> c5Function = Computer::new;
+        Computer c5 = c5Function.apply(2010, "black");
+        BiFunction<Integer, String, Computer> c6Function = Computer::new;
+        Computer c6 = c6Function.apply(2008, "black");
+
+        List<Computer> inventory = Arrays.asList(c1, c2, c3, c4, c5, c6);
+
+        List<Computer> blackComputer = filter(inventory, blackPredicate);
+        Assert.assertEquals("The black Computers are: ", blackComputer.size(), 4);
+
+        List<Computer> after2010Computer = filter(inventory, after2010Predicate);
+        Assert.assertEquals("The Computer bought after 2010 are: ", after2010Computer.size(), 3);
+
+        List<Computer> before2011Computer = filter(inventory, c -> c.getAge() < 2011);
+        Assert.assertEquals("The Computer bought before 2011 are: ", before2011Computer.size(), 3);
+
+        inventory.sort(Comparator.comparing(Computer::getAge));
+
+        Assert.assertEquals("Oldest Computer in inventory", c6, inventory.get(0));
+
+    }
+
+    @Test
+    public void testStaticMethodReference() {
+
+        Computer c1 = new Computer(2015, "white", 35);
+        Computer c2 = new Computer(2009, "black", 65);
+        TriFunction<Integer, String, Integer, Computer> c6Function = Computer::new;
+        Computer c3 = c6Function.apply(2008, "black", 90);
+
+        List<Computer> inventory = Arrays.asList(c1, c2, c3);
+        inventory.forEach(ComputerUtils::repair);
+
+        Assert.assertEquals("Computer repaired", new Integer(100), c1.getHealty());
+    }
+
+    @Test
+    public void testInstanceMethodArbitraryObjectParticularType() {
+
+        Computer c1 = new Computer(2015, "white", 35);
+        Computer c2 = new MacbookPro(2009, "black", 65);
+        List<Computer> inventory = Arrays.asList(c1, c2);
+        inventory.forEach(Computer::turnOnPc);
+
+    }
+
+    @Test
+    public void testSuperMethodReference() {
+
+        final TriFunction<Integer, String, Integer, MacbookPro> integerStringIntegerObjectTriFunction = MacbookPro::new;
+        final MacbookPro macbookPro = integerStringIntegerObjectTriFunction.apply(2010, "black", 100);
+        Double initialValue = new Double(999.99);
+        final Double actualValue = macbookPro.calculateValue(initialValue);
+        Assert.assertEquals(766.659, actualValue, 0.0);
+    }
+
+}

core-java-8/src/test/java/com/baeldung/java8/Java8CollectionCleanupUnitTest.java

@@ -1,4 +1,4 @@
-package org.baeldung.java8;
+package com.baeldung.java8;
 
 import static org.hamcrest.Matchers.hasSize;
 import static org.junit.Assert.assertThat;
@@ -30,6 +30,14 @@ public class Java8CollectionCleanupUnitTest {
         assertThat(listWithoutNulls, hasSize(3));
     }
 
+    @Test
+    public void givenListContainsNulls_whenRemovingNullsWithRemoveIf_thenCorrect() {
+        final List<Integer> listWithoutNulls = Lists.newArrayList(null, 1, 2, null, 3, null);
+        listWithoutNulls.removeIf(p -> p == null);
+
+        assertThat(listWithoutNulls, hasSize(3));
+    }
+
     @Test
     public void givenListContainsDuplicates_whenRemovingDuplicatesWithJava8_thenCorrect() {
         final List<Integer> listWithDuplicates = Lists.newArrayList(1, 1, 2, 2, 3, 3);

core-java-8/src/test/java/com/baeldung/java8/Java8FunctionalInteracesLambdasTest.java

@@ -0,0 +1,95 @@
+package com.baeldung.java8;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+
+import java.util.function.Function;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import com.baeldung.Foo;
+import com.baeldung.FooExtended;
+import com.baeldung.UseFoo;
+
+public class Java8FunctionalInteracesLambdasTest {
+
+    private UseFoo useFoo;
+
+    @Before
+    public void init() {
+        useFoo = new UseFoo();
+    }
+
+    @Test
+    public void functionalInterfaceInstantiation_whenReturnDefiniteString_thenCorrect() {
+        final Foo foo = parameter -> parameter + "from lambda";
+        final String result = useFoo.add("Message ", foo);
+
+        assertEquals("Message from lambda", result);
+    }
+
+    @Test
+    public void standardFIParameter_whenReturnDefiniteString_thenCorrect() {
+        final Function<String, String> fn = parameter -> parameter + "from lambda";
+        final String result = useFoo.addWithStandardFI("Message ", fn);
+
+        assertEquals("Message from lambda", result);
+    }
+
+    @Test
+    public void defaultMethodFromExtendedInterface_whenReturnDefiniteString_thenCorrect() {
+        final FooExtended fooExtended = string -> string;
+        final String result = fooExtended.defaultMethod();
+
+        assertEquals("String from Bar", result);
+    }
+
+    @Test
+    public void lambdaAndInnerClassInstantiation_whenReturnSameString_thenCorrect() {
+        final Foo foo = parameter -> parameter + "from Foo";
+
+        final Foo fooByIC = new Foo() {
+            @Override
+            public String method(final String string) {
+                return string + "from Foo";
+            }
+        };
+
+        assertEquals(foo.method("Something "), fooByIC.method("Something "));
+    }
+
+    @Test
+    public void accessVariablesFromDifferentScopes_whenReturnPredefinedString_thenCorrect() {
+        assertEquals("Results: resultIC = Inner class value, resultLambda = Enclosing scope value", useFoo.scopeExperiment());
+    }
+
+    @Test
+    public void shorteningLambdas_whenReturnEqualsResults_thenCorrect() {
+        final Foo foo = parameter -> buildString(parameter);
+
+        final Foo fooHuge = parameter -> {
+            final String result = "Something " + parameter;
+            // many lines of code
+            return result;
+        };
+
+        assertEquals(foo.method("Something"), fooHuge.method("Something"));
+    }
+
+    private String buildString(final String parameter) {
+        final String result = "Something " + parameter;
+        // many lines of code
+        return result;
+    }
+
+    @Test
+    public void mutatingOfEffectivelyFinalVariable_whenNotEquals_thenCorrect() {
+        final int[] total = new int[1];
+        final Runnable r = () -> total[0]++;
+        r.run();
+
+        assertNotEquals(0, total[0]);
+    }
+
+}

core-java-8/src/test/java/com/baeldung/java8/Java8SortUnitTest.java

@@ -1,4 +1,4 @@
-package org.baeldung.java8;
+package com.baeldung.java8;
 
 import static org.hamcrest.Matchers.equalTo;
 
@@ -6,10 +6,10 @@ import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 
-import org.baeldung.java8.entity.Human;
 import org.junit.Assert;
 import org.junit.Test;
 
+import com.baeldung.java8.entity.Human;
 import com.google.common.collect.Lists;
 import com.google.common.primitives.Ints;