Merge pull request #5 from eugenp/master

Updating local repo

algorithms-searching/README.md

@@ -3,6 +3,7 @@
 This module contains articles about searching algorithms.
 
 ### Relevant articles:
+
 - [Binary Search Algorithm in Java](https://www.baeldung.com/java-binary-search)
 - [Depth First Search in Java](https://www.baeldung.com/java-depth-first-search)
 - [Interpolation Search in Java](https://www.baeldung.com/java-interpolation-search)
@@ -11,3 +12,4 @@ This module contains articles about searching algorithms.
 - [Monte Carlo Tree Search for Tic-Tac-Toe Game](https://www.baeldung.com/java-monte-carlo-tree-search)
 - [Range Search Algorithm in Java](https://www.baeldung.com/java-range-search)
 - [Fast Pattern Matching of Strings Using Suffix Tree](https://www.baeldung.com/java-pattern-matching-suffix-tree)
+- [Find the Kth Smallest Element in Two Sorted Arrays](https://www.baeldung.com/java-kth-smallest-element-in-sorted-arrays)

apache-poi/README.md

@@ -3,9 +3,11 @@
 This module contains articles about Apache POI
 
 ### Relevant Articles:
+
 - [Microsoft Word Processing in Java with Apache POI](https://www.baeldung.com/java-microsoft-word-with-apache-poi)
 - [Working with Microsoft Excel in Java](https://www.baeldung.com/java-microsoft-excel)
 - [Creating a MS PowerPoint Presentation in Java](https://www.baeldung.com/apache-poi-slideshow)
 - [Merge Cells in Excel Using Apache POI](https://www.baeldung.com/java-apache-poi-merge-cells)
 - [Get String Value of Excel Cell with Apache POI](https://www.baeldung.com/java-apache-poi-cell-string-value)
 - [Read Excel Cell Value Rather Than Formula With Apache POI](https://www.baeldung.com/apache-poi-read-cell-value-formula)
+- [Setting Formulas in Excel with Apache POI](https://www.baeldung.com/java-apache-poi-set-formulas)

core-java-modules/core-java-10/README.md

@@ -9,3 +9,4 @@ This module contains articles about Java 10 core features
 - [Copy a List to Another List in Java](http://www.baeldung.com/java-copy-list-to-another)
 - [Deep Dive Into the New Java JIT Compiler – Graal](https://www.baeldung.com/graal-java-jit-compiler)
 - [Copying Sets in Java](https://www.baeldung.com/java-copy-sets)
+- [Converting between a List and a Set in Java](https://www.baeldung.com/convert-list-to-set-and-set-to-list)

core-java-modules/core-java-10/pom.xml

@@ -1,22 +1,29 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project
-    xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns="http://maven.apache.org/POM/4.0.0"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        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">
+        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-10</artifactId>
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-10</name>
     <packaging>jar</packaging>
-    <url>http://maven.apache.org</url>
 
     <parent>
-        <groupId>com.baeldung</groupId>
+        <groupId>com.baeldung.core-java-modules</groupId>
-        <artifactId>parent-modules</artifactId>
+        <artifactId>core-java-modules</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
+        <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../../</relativePath>
+        <relativePath>../</relativePath>
     </parent>
 
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+            <version>${commons-collections4.version}</version>
+        </dependency>
+    </dependencies>
+
     <build>
         <plugins>
             <plugin>
@@ -34,6 +41,7 @@
     <properties>
         <maven.compiler.source.version>10</maven.compiler.source.version>
         <maven.compiler.target.version>10</maven.compiler.target.version>
+        <commons-collections4.version>4.1</commons-collections4.version>
     </properties>
 
 </project>

core-java-modules/core-java-10/src/test/java/com/baeldung/java10/collections/conversion/ListSetConversionUnitTest.java

@@ -0,0 +1,68 @@
+package com.baeldung.java10.collections.conversion;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
+import org.apache.commons.collections4.CollectionUtils;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+public class ListSetConversionUnitTest {
+
+    // Set -> List; List -> Set
+
+    @Test
+    public final void givenUsingCoreJava_whenSetConvertedToList_thenCorrect() {
+        final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
+        final List<Integer> targetList = new ArrayList<>(sourceSet);
+    }
+
+    @Test
+    public final void givenUsingCoreJava_whenListConvertedToSet_thenCorrect() {
+        final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
+        final Set<Integer> targetSet = new HashSet<>(sourceList);
+    }
+
+    @Test
+    public void givenUsingJava10_whenSetConvertedToList_thenCorrect() {
+        final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
+        final List<Integer> targetList = List.copyOf(sourceSet);
+    }
+
+    @Test
+    public void givenUsingJava10_whenListConvertedToSet_thenCorrect() {
+        final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
+        final Set<Integer> targetSet = Set.copyOf(sourceList);
+    }
+
+    @Test
+    public final void givenUsingGuava_whenSetConvertedToList_thenCorrect() {
+        final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
+        final List<Integer> targetList = Lists.newArrayList(sourceSet);
+    }
+
+    @Test
+    public final void givenUsingGuava_whenListConvertedToSet_thenCorrect() {
+        final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
+        final Set<Integer> targetSet = Sets.newHashSet(sourceList);
+    }
+
+    @Test
+    public final void givenUsingCommonsCollections_whenListConvertedToSet_thenCorrect() {
+        final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
+
+        final Set<Integer> targetSet = new HashSet<>(6);
+        CollectionUtils.addAll(targetSet, sourceList);
+    }
+
+    @Test
+    public final void givenUsingCommonsCollections_whenSetConvertedToList_thenCorrect() {
+        final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
+
+        final List<Integer> targetList = new ArrayList<>(6);
+        CollectionUtils.addAll(targetList, sourceSet);
+    }
+}

core-java-modules/core-java-arrays-operations-advanced/README.md

@@ -3,7 +3,9 @@
 This module contains articles about advanced operations on arrays in Java. They assume some background knowledge with arrays in Java.
 
 ### Relevant Articles: 
+
 - [How to Copy an Array in Java](https://www.baeldung.com/java-array-copy)
 - [Arrays.deepEquals](https://www.baeldung.com/java-arrays-deepequals)
 - [Find Sum and Average in a Java Array](https://www.baeldung.com/java-array-sum-average)
 - [Intersection Between two Integer Arrays](https://www.baeldung.com/java-array-intersection)
+- [Comparing Arrays in Java](https://www.baeldung.com/java-comparing-arrays)

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

@@ -12,3 +12,4 @@
 - [Fail-Safe Iterator vs Fail-Fast Iterator](https://www.baeldung.com/java-fail-safe-vs-fail-fast-iterator)
 - [Quick Guide to the Java Stack](https://www.baeldung.com/java-stack)
 - [Convert an Array of Primitives to a List](https://www.baeldung.com/java-primitive-array-to-list)
+- [A Guide to BitSet in Java](https://www.baeldung.com/java-bitset)

core-java-modules/core-java-collections-list-3/README.md

@@ -10,4 +10,5 @@ This module contains articles about the Java List collection
 - [Performance Comparison of Primitive Lists in Java](https://www.baeldung.com/java-list-primitive-performance)
 - [Filtering a Java Collection by a List](https://www.baeldung.com/java-filter-collection-by-list)
 - [How to Count Duplicate Elements in Arraylist](https://www.baeldung.com/java-count-duplicate-elements-arraylist)
+- [Finding the Differences Between Two Lists in Java](https://www.baeldung.com/java-lists-difference)
 - [[<-- Prev]](/core-java-modules/core-java-collections-list-2)

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

@@ -1,5 +1,8 @@
 #Core Java Console
 
-[Read and Write User Input in Java](http://www.baeldung.com/java-console-input-output)
+### Relevant Articles:
-[Formatting with printf() in Java](https://www.baeldung.com/java-printstream-printf)
+
-[ASCII Art in Java](http://www.baeldung.com/ascii-art-in-java)
+- [Read and Write User Input in Java](http://www.baeldung.com/java-console-input-output)
+- [Formatting with printf() in Java](https://www.baeldung.com/java-printstream-printf)
+- [ASCII Art in Java](http://www.baeldung.com/ascii-art-in-java)
+- [System.console() vs. System.out](https://www.baeldung.com/java-system-console-vs-system-out)

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

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [NoSuchMethodError in Java](https://www.baeldung.com/java-nosuchmethod-error)

core-java-modules/core-java-exceptions-3/pom.xml

@@ -0,0 +1,34 @@
+<?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.exceptions</groupId>
+    <artifactId>core-java-exceptions-3</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-exceptions-3</name>
+    <packaging>jar</packaging>
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../</relativePath>
+    </parent>
+
+    <dependencies>
+        <!-- test scoped -->
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <!-- testing -->
+        <assertj-core.version>3.10.0</assertj-core.version>
+    </properties>
+
+</project>

core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/nosuchmethoderror/MainMenu.java

@@ -0,0 +1,11 @@
+package com.baeldung.exceptions.nosuchmethoderror;
+
+public class MainMenu {
+    public static void main(String[] args) {
+        System.out.println("Today's Specials: " + getSpecials());
+    }
+
+    public static String getSpecials() {
+        return SpecialToday.getDesert();
+    }
+}

core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/nosuchmethoderror/SpecialToday.java

@@ -0,0 +1,8 @@
+package com.baeldung.exceptions.nosuchmethoderror;
+public class SpecialToday {
+    private static String desert = "Chocolate Cake";
+
+    public static String getDesert() {
+        return desert;
+    }
+}

core-java-modules/core-java-exceptions-3/src/test/java/com/baeldung/exceptions/nosuchmethoderror/MainMenuUnitTest.java

@@ -0,0 +1,13 @@
+package com.baeldung.exceptions.nosuchmethoderror;
+
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.jupiter.api.Test;
+
+class MainMenuUnitTest {
+
+    @Test
+    void whenGetSpecials_thenNotNull() {
+        assertNotNull(MainMenu.getSpecials());
+    }
+}

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

@@ -6,4 +6,7 @@ This module contains articles about core Java input and output (IO)
 
 - [Java – Create a File](https://www.baeldung.com/java-how-to-create-a-file)
 - [Check If a Directory Is Empty in Java](https://www.baeldung.com/java-check-empty-directory)
+- [Check If a File or Directory Exists in Java](https://www.baeldung.com/java-file-directory-exists)
+- [Copy a Directory in Java](https://www.baeldung.com/java-copy-directory)
+- [Java Files Open Options](https://www.baeldung.com/java-file-options)
 - [[<-- Prev]](/core-java-modules/core-java-io-2)

core-java-modules/core-java-io-3/src/test/java/com/baeldung/linenumber/LineAtGivenNumberUnitTest.java

@@ -0,0 +1,82 @@
+package com.baeldung.linenumber;
+
+import org.apache.commons.io.FileUtils;
+import org.apache.commons.io.IOUtils;
+import org.junit.Test;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.List;
+import java.util.Scanner;
+import java.util.stream.Stream;
+
+import static org.junit.Assert.assertEquals;
+
+public class LineAtGivenNumberUnitTest {
+
+    private static final String FILE_PATH = "src/test/resources/linesInput.txt";
+
+    @Test
+    public void givenFile_whenUsingBufferedReader_thenExtractedLineIsCorrect() throws IOException {
+        try (BufferedReader br = Files.newBufferedReader(Paths.get(FILE_PATH))) {
+            for (int i = 0; i < 3; i++) {
+                br.readLine();
+            }
+
+            String extractedLine = br.readLine();
+            assertEquals("Line 4", extractedLine);
+        }
+    }
+
+    @Test
+    public void givenFile_whenUsingScanner_thenExtractedLineIsCorrect() throws IOException {
+        try (Scanner scanner = new Scanner(new File(FILE_PATH))) {
+            for (int i = 0; i < 3; i++) {
+                scanner.nextLine();
+            }
+
+            String extractedLine = scanner.nextLine();
+            assertEquals("Line 4", extractedLine);
+        }
+    }
+
+    @Test
+    public void givenSmallFile_whenUsingFilesAPI_thenExtractedLineIsCorrect() throws IOException {
+        String extractedLine = Files.readAllLines(Paths.get(FILE_PATH)).get(4);
+
+        assertEquals("Line 5", extractedLine);
+    }
+
+    @Test
+    public void givenLargeFile_whenUsingFilesAPI_thenExtractedLineIsCorrect() throws IOException {
+        try (Stream<String> lines = Files.lines(Paths.get(FILE_PATH))) {
+            String extractedLine = lines.skip(4).findFirst().get();
+
+            assertEquals("Line 5", extractedLine);
+        }
+    }
+
+    @Test
+    public void givenFile_whenUsingFileUtils_thenExtractedLineIsCorrect() throws IOException {
+        ClassLoader classLoader = getClass().getClassLoader();
+        File file = new File(classLoader.getResource("linesInput.txt").getFile());
+
+        List<String> lines = FileUtils.readLines(file, "UTF-8");
+
+        String extractedLine = lines.get(0);
+        assertEquals("Line 1", extractedLine);
+    }
+
+    @Test
+    public void givenFile_whenUsingIOUtils_thenExtractedLineIsCorrect() throws IOException {
+        String fileContent = IOUtils.toString(new FileInputStream(FILE_PATH), StandardCharsets.UTF_8);
+
+        String extractedLine = fileContent.split(System.lineSeparator())[0];
+        assertEquals("Line 1", extractedLine);
+    }
+}

core-java-modules/core-java-io-3/src/test/resources/linesInput.txt

@@ -0,0 +1,5 @@
+Line 1
+Line 2
+Line 3
+Line 4
+Line 5

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

@@ -10,4 +10,5 @@ This module contains articles about working with the Java Virtual Machine (JVM).
 - [boolean and boolean[] Memory Layout in the JVM](https://www.baeldung.com/jvm-boolean-memory-layout)
 - [Where Is the Array Length Stored in JVM?](https://www.baeldung.com/java-jvm-array-length)
 - [Memory Address of Objects in Java](https://www.baeldung.com/java-object-memory-address)
+- [List All Classes Loaded in a Specific Class Loader](https://www.baeldung.com/java-list-classes-class-loader)
 - More articles: [[<-- prev]](/core-java-modules/core-java-jvm)

core-java-modules/core-java-lambdas/src/main/java/com/baeldung/java8/lambda/tips/Bar.java

@@ -6,8 +6,11 @@ public interface Bar {
 
     String method(String string);
 
-    default String defaultMethod() {
+    default String defaultBar() {
-        return "String from Bar";
+        return "Default String from Bar";
     }
 
+    default String defaultCommon() {
+        return "Default Common from Bar";
+    }
 }

core-java-modules/core-java-lambdas/src/main/java/com/baeldung/java8/lambda/tips/Baz.java

@@ -6,7 +6,11 @@ public interface Baz {
 
     String method(String string);
 
-    default String defaultMethod() {
+    default String defaultBaz() {
-        return "String from Baz";
+        return "Default String from Baz";
+    }
+
+    default String defaultCommon(){
+        return "Default Common from Baz";
     }
 }

core-java-modules/core-java-lambdas/src/main/java/com/baeldung/java8/lambda/tips/FooExtended.java

@@ -5,8 +5,7 @@ package com.baeldung.java8.lambda.tips;
 public interface FooExtended extends Baz, Bar {
 
     @Override
-    default String defaultMethod() {
+    default String defaultCommon() {
-        return Bar.super.defaultMethod();
+        return Bar.super.defaultCommon();
     }
-
 }

core-java-modules/core-java-lambdas/src/test/java/com/baeldung/java8/lambda/tips/Java8FunctionalInteracesLambdasUnitTest.java

@@ -39,9 +39,9 @@ public class Java8FunctionalInteracesLambdasUnitTest {
     @Test
     public void defaultMethodFromExtendedInterface_whenReturnDefiniteString_thenCorrect() {
         final FooExtended fooExtended = string -> string;
-        final String result = fooExtended.defaultMethod();
+        final String result = fooExtended.defaultCommon();
 
-        assertEquals("String from Bar", result);
+        assertEquals("Default Common from Bar", result);
     }
 
     @Test

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

@@ -4,4 +4,5 @@ This module contains articles about core features in the Java language
 
 - [Class.isInstance vs Class.isAssignableFrom](https://www.baeldung.com/java-isinstance-isassignablefrom)
 - [Converting a Java String Into a Boolean](https://www.baeldung.com/java-string-to-boolean)
+- [When are Static Variables Initialized in Java?](https://www.baeldung.com/java-static-variables-initialization)
 - [[<-- Prev]](/core-java-modules/core-java-lang-2)

core-java-modules/core-java-lang-oop-types/README.md

@@ -3,6 +3,7 @@
 This module contains articles about types in Java
 
 ### Relevant Articles: 
+
 - [Java Classes and Objects](https://www.baeldung.com/java-classes-objects)
 - [Guide to the this Java Keyword](https://www.baeldung.com/java-this)
 - [Nested Classes in Java](https://www.baeldung.com/java-nested-classes)
@@ -10,3 +11,4 @@ This module contains articles about types in Java
 - [Iterating Over Enum Values in Java](https://www.baeldung.com/java-enum-iteration)
 - [Attaching Values to Java Enum](https://www.baeldung.com/java-enum-values)
 - [A Guide to Java Enums](https://www.baeldung.com/a-guide-to-java-enums)
+- [Determine if an Object is of Primitive Type](https://www.baeldung.com/java-object-primitive-type)

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

@@ -12,5 +12,6 @@ This module contains articles about working with the operating system (OS) in Ja
 - [How to Print Screen in Java](http://www.baeldung.com/print-screen-in-java)
 - [Pattern Search with Grep in Java](http://www.baeldung.com/grep-in-java)
 - [How to Run a Shell Command in Java](http://www.baeldung.com/run-shell-command-in-java)
+- [Taking Screenshots Using Java](https://www.baeldung.com/java-taking-screenshots)
 
-This module uses Java 9, so make sure to have the JDK 9 installed to run it.
+This module uses Java 9, so make sure to have the JDK 9 installed to run it.

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

@@ -1,3 +1,4 @@
 ### Relevant Articles:
 
 - [Reading the Value of ‘private’ Fields from a Different Class in Java](https://www.baeldung.com/java-reflection-read-private-field-value)
+- [Set Field Value With Reflection](https://www.baeldung.com/java-set-private-field-value)

core-java-modules/pom.xml

@@ -73,7 +73,7 @@
 
         <module>core-java-exceptions</module>
         <module>core-java-exceptions-2</module>
-
+        <module>core-java-exceptions-3</module>
         <module>core-java-function</module>
 
         <module>core-java-io</module>

core-kotlin-modules/core-kotlin/README.md

@@ -3,6 +3,7 @@
 This module contains articles about Kotlin core features.
 
 ### Relevant articles:
+
 - [Introduction to the Kotlin Language](https://www.baeldung.com/kotlin-intro)
 - [Kotlin Java Interoperability](https://www.baeldung.com/kotlin-java-interoperability)
 - [Get a Random Number in Kotlin](https://www.baeldung.com/kotlin-random-number)
@@ -10,3 +11,4 @@ This module contains articles about Kotlin core features.
 - [Kotlin Ternary Conditional Operator](https://www.baeldung.com/kotlin-ternary-operator)
 - [Sequences in Kotlin](https://www.baeldung.com/kotlin/sequences)
 - [Converting Kotlin Data Class from JSON using GSON](https://www.baeldung.com/kotlin-json-convert-data-class)
+- [Exception Handling in Kotlin](https://www.baeldung.com/kotlin/exception-handling)

deeplearning4j/README.md

@@ -5,3 +5,4 @@ This module contains articles about Deeplearning4j.
 ### Relevant Articles:
 - [A Guide to Deeplearning4j](https://www.baeldung.com/deeplearning4j)
 - [Logistic Regression in Java](https://www.baeldung.com/java-logistic-regression)
+- [How to Implement a CNN with Deeplearning4j](https://www.baeldung.com/java-cnn-deeplearning4j)

docker/README.md

@@ -1,3 +1,4 @@
 ## Relevant Articles:
 
 - [Introduction to Docker Compose](https://www.baeldung.com/docker-compose)
+- [Creating Docker Images with Spring Boot](https://www.baeldung.com/spring-boot-docker-images)