Merge remote-tracking branch 'upstream/master'

apache-cxf/README.md

@@ -0,0 +1,2 @@
+## Relevant Articles:
+- [Introduction to Apache CXF Aegis Data Binding](http://www.baeldung.com/aegis-data-binding-in-apache-cxf)

apache-cxf/cxf-aegis/pom.xml

@@ -0,0 +1,20 @@
+<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/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>cxf-aegis</artifactId>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>apache-cxf</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+    <properties>
+        <cxf.version>3.1.8</cxf.version>        
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.cxf</groupId>
+            <artifactId>cxf-rt-databinding-aegis</artifactId>
+            <version>${cxf.version}</version>
+        </dependency>
+    </dependencies>
+</project>

apache-cxf/cxf-aegis/src/main/java/com/baeldung/cxf/aegis/Course.java

@@ -0,0 +1,42 @@
+package com.baeldung.cxf.aegis;
+
+import java.util.Date;
+
+public class Course {
+    private int id;
+    private String name;
+    private String instructor;
+    private Date enrolmentDate;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getInstructor() {
+        return instructor;
+    }
+
+    public void setInstructor(String instructor) {
+        this.instructor = instructor;
+    }
+
+    public Date getEnrolmentDate() {
+        return enrolmentDate;
+    }
+
+    public void setEnrolmentDate(Date enrolmentDate) {
+        this.enrolmentDate = enrolmentDate;
+    }
+}

apache-cxf/cxf-aegis/src/main/java/com/baeldung/cxf/aegis/CourseRepo.java

@@ -0,0 +1,11 @@
+package com.baeldung.cxf.aegis;
+
+import java.util.Map;
+
+public interface CourseRepo {
+    String getGreeting();
+    void setGreeting(String greeting);
+    Map<Integer, Course> getCourses();
+    void setCourses(Map<Integer, Course> courses);
+    void addCourse(Course course);  
+}

apache-cxf/cxf-aegis/src/main/java/com/baeldung/cxf/aegis/CourseRepoImpl.java

@@ -0,0 +1,34 @@
+package com.baeldung.cxf.aegis;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class CourseRepoImpl implements CourseRepo {
+    private String greeting;
+    private Map<Integer, Course> courses = new HashMap<>();
+
+    @Override
+    public String getGreeting() {
+        return greeting;
+    }
+
+    @Override
+    public void setGreeting(String greeting) {
+        this.greeting = greeting;
+    }
+
+    @Override
+    public Map<Integer, Course> getCourses() {
+        return courses;
+    }
+
+    @Override
+    public void setCourses(Map<Integer, Course> courses) {
+        this.courses = courses;
+    }
+
+    @Override
+    public void addCourse(Course course) {
+        courses.put(course.getId(), course);
+    }
+}

apache-cxf/cxf-aegis/src/main/resources/com/baeldung/cxf/aegis/Course.aegis.xml

@@ -0,0 +1,5 @@
+<mappings>
+    <mapping>
+        <property name="instructor" ignore="true"/>
+    </mapping>
+</mappings>

apache-cxf/cxf-aegis/src/main/resources/com/baeldung/cxf/aegis/CourseRepo.aegis.xml

@@ -0,0 +1,5 @@
+<mappings xmlns:ns="http://courserepo.baeldung.com">
+    <mapping name="ns:Baeldung">
+        <property name="greeting" style="attribute"/>
+    </mapping>
+</mappings>

apache-cxf/cxf-aegis/src/test/java/com/baeldung/cxf/aegis/BaeldungTest.java

@@ -0,0 +1,93 @@
+package com.baeldung.cxf.aegis;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+import org.junit.Test;
+
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.lang.reflect.Type;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLOutputFactory;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.cxf.aegis.AegisContext;
+import org.apache.cxf.aegis.AegisReader;
+import org.apache.cxf.aegis.AegisWriter;
+import org.apache.cxf.aegis.type.AegisType;
+
+public class BaeldungTest {
+    private AegisContext context;
+    private String fileName = "baeldung.xml";
+
+    @Test
+    public void whenMarshalingAndUnmarshalingCourseRepo_thenCorrect() throws Exception {
+        initializeContext();
+        CourseRepo inputRepo = initCourseRepo();
+        marshalCourseRepo(inputRepo);
+        CourseRepo outputRepo = unmarshalCourseRepo();
+        Course restCourse = outputRepo.getCourses().get(1);
+        Course securityCourse = outputRepo.getCourses().get(2);
+        assertEquals("Welcome to Beldung!", outputRepo.getGreeting());
+        assertEquals("REST with Spring", restCourse.getName());
+        assertEquals(new Date(1234567890000L), restCourse.getEnrolmentDate());
+        assertNull(restCourse.getInstructor());
+        assertEquals("Learn Spring Security", securityCourse.getName());
+        assertEquals(new Date(1456789000000L), securityCourse.getEnrolmentDate());
+        assertNull(securityCourse.getInstructor());
+    }
+    
+    private void initializeContext() {
+        context = new AegisContext();
+        Set<Type> rootClasses = new HashSet<Type>();
+        rootClasses.add(CourseRepo.class);
+        context.setRootClasses(rootClasses);
+        Map<Class<?>, String> beanImplementationMap = new HashMap<>();
+        beanImplementationMap.put(CourseRepoImpl.class, "CourseRepo");
+        context.setBeanImplementationMap(beanImplementationMap);
+        context.setWriteXsiTypes(true);
+        context.initialize();
+    }
+    
+    private CourseRepoImpl initCourseRepo() {
+        Course restCourse = new Course();
+        restCourse.setId(1);
+        restCourse.setName("REST with Spring");
+        restCourse.setInstructor("Eugen");
+        restCourse.setEnrolmentDate(new Date(1234567890000L));
+        Course securityCourse = new Course();
+        securityCourse.setId(2);
+        securityCourse.setName("Learn Spring Security");
+        securityCourse.setInstructor("Eugen");
+        securityCourse.setEnrolmentDate(new Date(1456789000000L));
+        CourseRepoImpl courseRepo = new CourseRepoImpl();
+        courseRepo.setGreeting("Welcome to Beldung!");
+        courseRepo.addCourse(restCourse);
+        courseRepo.addCourse(securityCourse);
+        return courseRepo;
+    }
+    
+    private void marshalCourseRepo(CourseRepo courseRepo) throws Exception {
+        AegisWriter<XMLStreamWriter> writer = context.createXMLStreamWriter();
+        AegisType aegisType = context.getTypeMapping().getType(CourseRepo.class);
+        XMLStreamWriter xmlWriter = XMLOutputFactory.newInstance().createXMLStreamWriter(new FileOutputStream(fileName));
+        writer.write(courseRepo, new QName("http://aegis.cxf.baeldung.com", "baeldung"), false, xmlWriter, aegisType);
+        xmlWriter.close();
+    }
+
+    private CourseRepo unmarshalCourseRepo() throws Exception {       
+        AegisReader<XMLStreamReader> reader = context.createXMLStreamReader();
+        XMLStreamReader xmlReader = XMLInputFactory.newInstance().createXMLStreamReader(new FileInputStream(fileName));
+        CourseRepo courseRepo = (CourseRepo) reader.read(xmlReader, context.getTypeMapping().getType(CourseRepo.class));
+        xmlReader.close();
+        return courseRepo;
+    }
+}

apache-cxf/cxf-jaxrs-implementation/README.md

@@ -0,0 +1,2 @@
+### Relevant Articles:
+- [Apache CXF Support for RESTful Web Services](http://www.baeldung.com/apache-cxf-rest-api)

apache-cxf/pom.xml

@@ -10,6 +10,7 @@
         <module>cxf-introduction</module>
         <module>cxf-spring</module>
         <module>cxf-jaxrs-implementation</module>
+        <module>cxf-aegis</module>
     </modules>
     
     <properties>

core-java-9/README.md

@@ -3,3 +3,6 @@
 ## Core Java 9  Examples
 
 [Java 9 New Features](http://www.baeldung.com/new-java-9)
+
+### Relevant Articles:
+- [Java 9 Stream API Improvements](http://www.baeldung.com/java-9-stream-api)

core-java/.gitignore

@@ -13,4 +13,6 @@
 *.ear
 
 # Files generated by integration tests
-*.txt
+*.txt
+/bin/
+/temp

core-java/README.md

@@ -39,3 +39,10 @@
 - [How to Print Screen in Java](http://www.baeldung.com/print-screen-in-java)
 - [How to Convert String to different data types in Java](http://www.baeldung.com/java-string-conversions)
 - [Introduction to Java Generics](http://www.baeldung.com/java-generics)
+- [Generate equals() and hashCode() with Eclipse](http://www.baeldung.com/java-eclipse-equals-and-hashcode)
+- [A Guide To Java Regular Expressions API](http://www.baeldung.com/regular-expressions-java)
+- [Sorting in Java](http://www.baeldung.com/java-sorting)
+- [Getting Started with Java Properties](http://www.baeldung.com/java-properties)
+- [Grep in Java](http://www.baeldung.com/grep-in-java)
+- [Java - Combine Multiple Collections](http://www.baeldung.com/java-combine-multiple-collections)
+- [Simulated Annealing for Travelling Salesman Problem](http://www.baeldung.com/java-simulated-annealing-for-traveling-salesman)

core-java/src/main/java/com/baeldung/README.md

@@ -0,0 +1,2 @@
+### Relevant Articles:
+- [SHA-256 Hashing in Java](http://www.baeldung.com/sha-256-hashing-java)

core-java/src/main/java/com/baeldung/algorithms/City.java

@@ -0,0 +1,22 @@
+package com.baeldung.algorithms;
+
+import lombok.Data;
+
+@Data
+public class City {
+
+	private int x;
+	private int y;
+
+	public City() {
+		this.x = (int) (Math.random() * 500);
+		this.y = (int) (Math.random() * 500);
+	}
+
+	public double distanceToCity(City city) {
+		int x = Math.abs(getX() - city.getX());
+		int y = Math.abs(getY() - city.getY());
+		return Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
+	}
+
+}

core-java/src/main/java/com/baeldung/algorithms/SimulatedAnnealing.java

@@ -0,0 +1,40 @@
+package com.baeldung.algorithms;
+
+public class SimulatedAnnealing {
+
+    private static Travel travel = new Travel(10);
+
+    public static double simulateAnnealing(double startingTemperature, int numberOfIterations, double coolingRate) {
+        System.out.println("Starting SA with temperature: " + startingTemperature + ", # of iterations: " + numberOfIterations + " and colling rate: " + coolingRate);
+        double t = startingTemperature;
+        travel.generateInitialTravel();
+        double bestDistance = travel.getDistance();
+        System.out.println("Initial distance of travel: " + bestDistance);
+        Travel bestSolution = travel;
+        Travel currentSolution = bestSolution;
+
+        for (int i = 0; i < numberOfIterations; i++) {
+            if (t > 0.1) {
+                currentSolution.swapCities();
+                double currentDistance = currentSolution.getDistance();
+                if (currentDistance < bestDistance) {
+                    bestDistance = currentDistance;
+                } else if (Math.exp((bestDistance - currentDistance) / t) < Math.random()) {
+                    currentSolution.revertSwap();
+                }
+                t *= coolingRate;
+            } else {
+            	continue;
+            }
+            if (i % 100 == 0) {
+                System.out.println("Iteration #" + i);
+            }
+        }
+        return bestDistance;
+    }
+
+    public static void main(String[] args) {
+        System.out.println("Optimized distance for travel: " + simulateAnnealing(10, 10000, 0.9995));
+    }
+
+}

core-java/src/main/java/com/baeldung/algorithms/Travel.java

@@ -0,0 +1,63 @@
+package com.baeldung.algorithms;
+
+import java.util.ArrayList;
+import java.util.Collections;
+
+import lombok.Data;
+
+@Data
+public class Travel {
+
+    private ArrayList<City> travel = new ArrayList<>();
+    private ArrayList<City> previousTravel = new ArrayList<>();
+
+    public Travel(int numberOfCities) {
+        for (int i = 0; i < numberOfCities; i++) {
+            travel.add(new City());
+        }
+    }
+
+    public void generateInitialTravel() {
+        if (travel.isEmpty())
+            new Travel(10);
+        Collections.shuffle(travel);
+    }
+
+    public void swapCities() {
+        int a = generateRandomIndex();
+        int b = generateRandomIndex();
+        previousTravel = travel;
+        City x = travel.get(a);
+        City y = travel.get(b);
+        travel.set(a, y);
+        travel.set(b, x);
+    }
+
+    public void revertSwap() {
+        travel = previousTravel;
+    }
+
+    private int generateRandomIndex() {
+        return (int) (Math.random() * travel.size());
+    }
+
+    public City getCity(int index) {
+        return travel.get(index);
+    }
+
+    public int getDistance() {
+        int distance = 0;
+        for (int index = 0; index < travel.size(); index++) {
+            City starting = getCity(index);
+            City destination;
+            if (index + 1 < travel.size()) {
+                destination = getCity(index + 1);
+            } else {
+                destination = getCity(0);
+            }
+            distance += starting.distanceToCity(destination);
+        }
+        return distance;
+    }
+
+}

core-java/src/main/java/com/baeldung/java/networking/README.md

@@ -0,0 +1,5 @@
+### Relevant Articles:
+- [A Guide To UDP In Java](http://www.baeldung.com/udp-in-java)
+- [A Guide To HTTP Cookies In Java](http://www.baeldung.com/cookies-java)
+- [A Guide to the Java URL](http://www.baeldung.com/java-url)
+- [Working with Network Interfaces in Java](http://www.baeldung.com/java-network-interfaces)

core-java/src/main/java/com/baeldung/java/nio/selector/README.md

@@ -0,0 +1,2 @@
+###Relevant Articles:
+- [Introduction to the Java NIO Selector](http://www.baeldung.com/java-nio-selector)

core-java/src/main/java/com/baeldung/printscreen/README.md

@@ -0,0 +1,2 @@
+### Relevant Articles:
+- [How to Print Screen in Java](http://www.baeldung.com/print-screen-in-java)

core-java/src/main/java/com/baeldung/scripting/Nashorn.java

@@ -0,0 +1,48 @@
+package com.baeldung.scripting;
+
+import javax.script.Bindings;
+import javax.script.Invocable;
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+import javax.script.ScriptException;
+
+public class Nashorn {
+    public static void main(String[] args) throws ScriptException, NoSuchMethodException {
+        ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
+
+        Object result = engine.eval(
+                "var greeting='hello world';" +
+                        "print(greeting);" +
+                        "greeting");
+
+        System.out.println(result);
+
+        Bindings bindings = engine.createBindings();
+        bindings.put("count", 3);
+        bindings.put("name", "baeldung");
+
+        String script = "var greeting='Hello ';" +
+                "for(var i=count;i>0;i--) { " +
+                "greeting+=name + ' '" +
+                "}" +
+                "greeting";
+
+        Object bindingsResult = engine.eval(script, bindings);
+        System.out.println(bindingsResult);
+
+        engine.eval("function composeGreeting(name) {" +
+                "return 'Hello ' + name" +
+                "}");
+        Invocable invocable = (Invocable) engine;
+
+        Object funcResult = invocable.invokeFunction("composeGreeting", "baeldung");
+        System.out.println(funcResult);
+
+        Object map = engine.eval("var HashMap = Java.type('java.util.HashMap');" +
+                "var map = new HashMap();" +
+                "map.put('hello', 'world');" +
+                "map");
+
+        System.out.println(map);
+    }
+}

core-java/src/test/java/com/baeldung/algorithms/SimulatedAnnealingTest.java

@@ -0,0 +1,13 @@
+package com.baeldung.algorithms;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class SimulatedAnnealingTest {
+
+    @Test
+    public void testSimulateAnnealing() {
+        Assert.assertTrue(SimulatedAnnealing.simulateAnnealing(10, 1000, 0.9) > 0);
+    }
+
+}

core-java/src/test/java/com/baeldung/encoderdecoder/EncoderDecoderUnitTest.java

@@ -22,7 +22,6 @@ public class EncoderDecoderUnitTest {
     private static final String testUrl = "http://www.baeldung.com?key1=value+1&key2=value%40%21%242&key3=value%253";
     private static final String testUrlWithPath = "http://www.baeldung.com/path+1?key1=value+1&key2=value%40%21%242&key3=value%253";
 
-
     private String encodeValue(String value) {
         String encoded = null;
         try {
@@ -59,9 +58,7 @@ public class EncoderDecoderUnitTest {
         requestParams.put("key2", "value@!$2");
         requestParams.put("key3", "value%3");
 
-        String encodedURL = requestParams.keySet().stream()
-          .map(key -> key + "=" + encodeValue(requestParams.get(key)))
-          .collect(joining("&", "http://www.baeldung.com?", ""));
+        String encodedURL = requestParams.keySet().stream().map(key -> key + "=" + encodeValue(requestParams.get(key))).collect(joining("&", "http://www.baeldung.com?", ""));
 
         Assert.assertThat(testUrl, is(encodedURL));
     }
@@ -103,12 +100,9 @@ public class EncoderDecoderUnitTest {
 
         String path = "path+1";
 
-        String encodedURL = requestParams.keySet().stream()
-                .map(key -> key + "=" + encodeValue(requestParams.get(key)))
-                .collect(joining("&", "http://www.baeldung.com/" + encodePath(path) + "?", ""));
+        String encodedURL = requestParams.keySet().stream().map(key -> key + "=" + encodeValue(requestParams.get(key))).collect(joining("&", "http://www.baeldung.com/" + encodePath(path) + "?", ""));
 
         Assert.assertThat(testUrlWithPath, is(encodedURL));
     }
 
-
 }

core-java/src/test/java/com/baeldung/grep/GrepWithUnix4JTest.java

@@ -0,0 +1,55 @@
+package com.baeldung.grep;
+
+import java.io.File;
+import java.util.List;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.unix4j.Unix4j;
+import static org.unix4j.Unix4j.*;
+import static org.junit.Assert.assertEquals;
+import org.unix4j.line.Line;
+import static org.unix4j.unix.Grep.*;
+import static org.unix4j.unix.cut.CutOption.*;
+
+public class GrepWithUnix4JTest {
+
+    private File fileToGrep;
+
+    @Before
+    public void init() {
+        final String separator = File.separator;
+        final String filePath = String.join(separator, new String[] { "src", "test", "resources", "dictionary.in" });
+        fileToGrep = new File(filePath);
+    }
+
+    @Test
+    public void whenGrepWithSimpleString_thenCorrect() {
+        int expectedLineCount = 4;
+
+        // grep "NINETEEN" dictionary.txt
+        List<Line> lines = Unix4j.grep("NINETEEN", fileToGrep).toLineList();
+
+        assertEquals(expectedLineCount, lines.size());
+    }
+
+    @Test
+    public void whenInverseGrepWithSimpleString_thenCorrect() {
+        int expectedLineCount = 178687;
+
+        // grep -v "NINETEEN" dictionary.txt
+        List<Line> lines = grep(Options.v, "NINETEEN", fileToGrep).toLineList();
+
+        assertEquals(expectedLineCount, lines.size());
+    }
+
+    @Test
+    public void whenGrepWithRegex_thenCorrect() {
+        int expectedLineCount = 151;
+
+        // grep -c ".*?NINE.*?" dictionary.txt
+        String patternCount = grep(Options.c, ".*?NINE.*?", fileToGrep).cut(fields, ":", 1).toStringResult();
+
+        assertEquals(expectedLineCount, Integer.parseInt(patternCount));
+    }
+}

core-java/src/test/java/com/baeldung/hexToAscii/README.md

@@ -0,0 +1,2 @@
+### Relevant Articles:
+- [Convert Hex to ASCII in Java](http://www.baeldung.com/java-convert-hex-to-ascii)

core-java/src/test/java/com/baeldung/java/conversion/README.md

@@ -0,0 +1,2 @@
+Relevant Articles:
+- [Java String Conversions](http://www.baeldung.com/java-string-conversions)

core-java/src/test/java/com/baeldung/java/nio2/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+- [Introduction to the Java NIO2 File API](http://www.baeldung.com/java-nio-2-file-api)
+- [Java NIO2 Path API](http://www.baeldung.com/java-nio-2-path)

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

@@ -17,9 +17,7 @@ public class Java8CollectionCleanupUnitTest {
     @Test
     public void givenListContainsNulls_whenFilteringParallel_thenCorrect() {
         final List<Integer> list = Lists.newArrayList(null, 1, 2, null, 3, null);
-        final List<Integer> listWithoutNulls = list.parallelStream()
-          .filter(Objects::nonNull)
-          .collect(Collectors.toList());
+        final List<Integer> listWithoutNulls = list.parallelStream().filter(Objects::nonNull).collect(Collectors.toList());
 
         assertThat(listWithoutNulls, hasSize(3));
     }
@@ -27,9 +25,7 @@ public class Java8CollectionCleanupUnitTest {
     @Test
     public void givenListContainsNulls_whenFilteringSerial_thenCorrect() {
         final List<Integer> list = Lists.newArrayList(null, 1, 2, null, 3, null);
-        final List<Integer> listWithoutNulls = list.stream()
-          .filter(Objects::nonNull)
-          .collect(Collectors.toList());
+        final List<Integer> listWithoutNulls = list.stream().filter(Objects::nonNull).collect(Collectors.toList());
 
         assertThat(listWithoutNulls, hasSize(3));
     }
@@ -45,9 +41,7 @@ public class Java8CollectionCleanupUnitTest {
     @Test
     public void givenListContainsDuplicates_whenRemovingDuplicatesWithJava8_thenCorrect() {
         final List<Integer> listWithDuplicates = Lists.newArrayList(1, 1, 2, 2, 3, 3);
-        final List<Integer> listWithoutDuplicates = listWithDuplicates.parallelStream()
-          .distinct()
-          .collect(Collectors.toList());
+        final List<Integer> listWithoutDuplicates = listWithDuplicates.parallelStream().distinct().collect(Collectors.toList());
 
         assertThat(listWithoutDuplicates, hasSize(3));
     }

core-java/src/test/java/com/baeldung/java8/JavaFileSizeUnitTest.java

@@ -0,0 +1,65 @@
+package com.baeldung.java8;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.channels.FileChannel;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import org.apache.commons.io.FileUtils;
+import org.junit.Before;
+import org.junit.Test;
+
+public class JavaFileSizeUnitTest {
+    private static final long EXPECTED_FILE_SIZE_IN_BYTES = 11;
+    private String filePath;
+
+    @Before
+    public void init() {
+        final String separator = File.separator;
+        filePath = String.join(separator, new String[] { "src", "test", "resources", "testFolder", "sample_file_1.in" });
+    }
+
+    @Test
+    public void whenGetFileSize_thenCorrect() {
+        final File file = new File(filePath);
+
+        final long size = getFileSize(file);
+
+        assertEquals(EXPECTED_FILE_SIZE_IN_BYTES, size);
+    }
+
+    @Test
+    public void whenGetFileSizeUsingNioApi_thenCorrect() throws IOException {
+        final Path path = Paths.get(this.filePath);
+        final FileChannel fileChannel = FileChannel.open(path);
+
+        final long fileSize = fileChannel.size();
+
+        assertEquals(EXPECTED_FILE_SIZE_IN_BYTES, fileSize);
+    }
+
+    @Test
+    public void whenGetFileSizeUsingApacheCommonsIO_thenCorrect() {
+        final File file = new File(filePath);
+
+        final long size = FileUtils.sizeOf(file);
+
+        assertEquals(EXPECTED_FILE_SIZE_IN_BYTES, size);
+    }
+
+    @Test
+    public void whenGetReadableFileSize_thenCorrect() {
+        final File file = new File(filePath);
+
+        final long size = getFileSize(file);
+
+        assertEquals(EXPECTED_FILE_SIZE_IN_BYTES + " bytes", FileUtils.byteCountToDisplaySize(size));
+    }
+
+    private long getFileSize(final File file) {
+        final long length = file.length();
+        return length;
+    }
+}