Merge branch 'master' of https://github.com/eugenp/tutorials

algorithms-miscellaneous-3/README.md

@@ -1,4 +1,4 @@
-## Relevant articles:
+## Relevant Articles:
 
 - [Java Two Pointer Technique](https://www.baeldung.com/java-two-pointer-technique)
 - [Implementing Simple State Machines with Java Enums](https://www.baeldung.com/java-enum-simple-state-machine)

core-groovy-2/src/main/groovy/com/baeldung/metaprogramming/Employee.groovy

@@ -0,0 +1,45 @@
+package com.baeldung.metaprogramming
+
+import groovy.transform.AutoClone
+import groovy.transform.Canonical
+import groovy.transform.EqualsAndHashCode
+import groovy.transform.ToString
+import groovy.transform.TupleConstructor
+import groovy.util.logging.*
+
+@Canonical
+@TupleConstructor
+@EqualsAndHashCode
+@ToString(includePackage=false, excludes=['id'])
+@Log 
+@AutoClone
+class Employee {
+
+    long id
+    String firstName
+    String lastName
+    int age
+
+    //method to catch missing property's getter
+    def propertyMissing(String propertyName) {
+        log.info "$propertyName is not available"
+        "property '$propertyName' is not available"
+    }
+
+    //method to catch missing property's setter
+    def propertyMissing(String propertyName, propertyValue) {
+        println "property '$propertyName' is not available"
+        log.info "$propertyName is not available"
+        "property '$propertyName' is not available"
+    }
+
+    def methodMissing(String methodName, def methodArgs) {
+        log.info "$methodName is not defined"
+        "method '$methodName' is not defined"
+    }
+    
+    def logEmp() {
+        log.info "Employee: $lastName, $firstName is of $age years age"
+    }
+
+}

core-groovy-2/src/main/groovy/com/baeldung/metaprogramming/extension/BasicExtensions.groovy

@@ -0,0 +1,30 @@
+package com.baeldung.metaprogramming.extension
+
+import com.baeldung.metaprogramming.Employee
+
+class BasicExtensions {
+    
+    static int getYearOfBirth(Employee self) {
+        return (new Date().getYear() + 1900) - self.age;
+    }
+    
+    static String capitalize(String self) {
+        return self.substring(0, 1).toUpperCase() + self.substring(1)
+    }
+
+    static void printCounter(Integer self) {
+        while (self>0) {
+            println self
+            self--
+        }
+    }
+    
+    static Long square(Long self) {
+        return self*self
+    }
+    
+    static BigDecimal cube(BigDecimal self) {
+        return self*self*self
+    }
+    
+}

core-groovy-2/src/main/groovy/com/baeldung/metaprogramming/extension/StaticEmployeeExtension.groovy

@@ -0,0 +1,10 @@
+package com.baeldung.metaprogramming.extension
+
+import com.baeldung.metaprogramming.Employee
+
+class StaticEmployeeExtension {
+    
+    static Employee getDefaultObj(Employee self) {
+        return new Employee(firstName: "firstName", lastName: "lastName", age: 20)
+    }
+}

core-groovy-2/src/main/resources/META-INF/services/org.codehaus.groovy.runtime.ExtensionModule

@@ -0,0 +1,4 @@
+moduleName=core-groovy-2
+moduleVersion=1.0-SNAPSHOT
+extensionClasses=com.baeldung.metaprogramming.extension.BasicExtensions
+staticExtensionClasses=com.baeldung.metaprogramming.extension.StaticEmployeeExtension

core-groovy-2/src/test/groovy/com/baeldung/metaprogramming/MetaprogrammingUnitTest.groovy

@@ -0,0 +1,118 @@
+package com.baeldung.metaprogramming
+
+import groovy.time.TimeCategory
+
+class MetaprogrammingUnitTest extends GroovyTestCase {
+
+    Employee emp = new Employee(firstName: "Norman", lastName: "Lewis")
+
+    void testPropertyMissing() {
+        assert emp.address == "property 'address' is not available"
+    }
+
+    void testMethodMissing() {
+        Employee emp = new Employee()
+        try {
+            emp.getFullName()
+        } catch(MissingMethodException e) {
+            println "method is not defined"
+        }
+        assert emp.getFullName() == "method 'getFullName' is not defined"
+    }
+
+    void testMetaClassProperty() {
+        Employee.metaClass.address = ""
+        emp = new Employee(firstName: "Norman", lastName: "Lewis", address: "US")
+        assert emp.address == "US"
+    }
+
+    void testMetaClassMethod() {
+        emp.metaClass.getFullName = {
+            "$lastName, $firstName"
+        }
+        assert emp.getFullName() == "Lewis, Norman"
+    }
+
+    void testMetaClassConstructor() {
+        try {
+            Employee emp = new Employee("Norman")
+        } catch(GroovyRuntimeException e) {
+            assert e.message == "Could not find matching constructor for: com.baeldung.metaprogramming.Employee(String)"
+        }
+
+        Employee.metaClass.constructor = { String firstName ->
+            new Employee(firstName: firstName)
+        }
+
+        Employee norman = new Employee("Norman")
+        assert norman.firstName == "Norman"
+        assert norman.lastName == null
+    }
+
+    void testJavaMetaClass() {
+        String.metaClass.capitalize = { String str ->
+            str.substring(0, 1).toUpperCase() + str.substring(1);
+        }
+        assert "norman".capitalize() == "Norman"
+    }
+
+    void testEmployeeExtension() {
+        Employee emp = new Employee(age: 28)
+        assert emp.getYearOfBirth() == 1991
+    }
+
+    void testJavaClassesExtensions() {
+        5.printCounter()
+
+        assert 40l.square() == 1600l
+
+        assert (2.98).cube() == 26.463592
+    }
+
+    void testStaticEmployeeExtension() {
+        assert Employee.getDefaultObj().firstName == "firstName"
+        assert Employee.getDefaultObj().lastName == "lastName"
+        assert Employee.getDefaultObj().age == 20
+    }
+
+    void testToStringAnnotation() {
+        Employee employee = new Employee()
+        employee.id = 1
+        employee.firstName = "norman"
+        employee.lastName = "lewis"
+        employee.age = 28
+
+        assert employee.toString() == "Employee(norman, lewis, 28)"
+    }
+
+    void testTupleConstructorAnnotation() {
+        Employee norman = new Employee(1, "norman", "lewis", 28)
+        assert norman.toString() == "Employee(norman, lewis, 28)"
+
+        Employee snape = new Employee(2, "snape")
+        assert snape.toString() == "Employee(snape, null, 0)"
+
+    }
+    
+    void testEqualsAndHashCodeAnnotation() {
+        Employee norman = new Employee(1, "norman", "lewis", 28)
+        Employee normanCopy = new Employee(1, "norman", "lewis", 28)
+        assert norman.equals(normanCopy)
+        assert norman.hashCode() == normanCopy.hashCode()
+    }
+    
+    void testAutoCloneAnnotation() {
+        try {
+            Employee norman = new Employee(1, "norman", "lewis", 28)
+            def normanCopy = norman.clone()
+            assert norman == normanCopy
+        } catch(CloneNotSupportedException e) {
+            e.printStackTrace()
+        }
+    }
+
+    void testLoggingAnnotation() {
+        Employee employee = new Employee(1, "Norman", "Lewis", 28)
+        employee.logEmp()
+    }
+}

core-java-modules/core-java-8-2/README.md

@@ -7,3 +7,4 @@
 - [How to Delay Code Execution in Java](https://www.baeldung.com/java-delay-code-execution)
 - [Run JAR Application With Command Line Arguments](https://www.baeldung.com/java-run-jar-with-arguments)
 - [Java 8 Stream skip() vs limit()](https://www.baeldung.com/java-stream-skip-vs-limit)
+- [Guide to Java BiFunction Interface](https://www.baeldung.com/java-bifunction-interface)

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

@@ -7,7 +7,7 @@
 - [Check if a Java Array Contains a Value](http://www.baeldung.com/java-array-contains-value)
 - [Initializing Arrays in Java](http://www.baeldung.com/java-initialize-array)
 - [Guide to the java.util.Arrays Class](http://www.baeldung.com/java-util-arrays)
-- [Jagged Arrays In Java](http://www.baeldung.com/java-jagged-arrays)
+- [Multi-Dimensional Arrays In Java](http://www.baeldung.com/java-jagged-arrays)
 - [Find Sum and Average in a Java Array](http://www.baeldung.com/java-array-sum-average)
 - [Arrays in Java: A Reference Guide](https://www.baeldung.com/java-arrays-guide)
 - [How to Invert an Array in Java](http://www.baeldung.com/java-invert-array)
@@ -16,3 +16,4 @@
 - [Sorting Arrays in Java](https://www.baeldung.com/java-sorting-arrays)
 - [Convert a Float to a Byte Array in Java](https://www.baeldung.com/java-convert-float-to-byte-array)
 - [Converting Between Stream and Array in Java](https://www.baeldung.com/java-stream-to-array)
+- [Removing an Element from an Array in Java](https://www.baeldung.com/java-array-remove-element)

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

@@ -0,0 +1,3 @@
+### Relevant Articles
+
+- [Design Strategies for Decoupling Java Modules](https://www.baeldung.com/java-modules-decoupling-design-strategies)

core-java-modules/core-java-lang-operators/pom.xml

@@ -0,0 +1,43 @@
+<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>core-java-lang-operators</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-lang-operators</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-java</relativePath>
+    </parent>
+
+    <dependencies>
+        <!-- test scoped -->
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>core-java-lang-operators</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <properties>
+        <!-- testing -->
+        <assertj-core.version>3.10.0</assertj-core.version>
+    </properties>
+
+</project>

core-java-modules/core-java-lang-operators/src/test/java/com/baeldung/incrementdecrementunaryoperators/IncrementDecrementUnaryOperatorUnitTest.java

@@ -1,6 +1,7 @@
-package com.baeldung.incrementdecrementunaryoperator;
+package com.baeldung.incrementdecrementunaryoperators;
 
 import static org.assertj.core.api.Assertions.assertThat;
+
 import org.junit.Test;
 
 public class IncrementDecrementUnaryOperatorUnitTest {

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

@@ -18,3 +18,4 @@
 - [The Modulo Operator in Java](https://www.baeldung.com/modulo-java)
 - [Ternary Operator In Java](https://www.baeldung.com/java-ternary-operator)
 - [Java instanceof Operator](https://www.baeldung.com/java-instanceof)
+- [Breaking Out of Nested Loops](https://www.baeldung.com/java-breaking-out-nested-loop)

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

@@ -1,3 +1,3 @@
-## Relevant articles:
+## Relevant Articles:
 
-- [Determine File Creating Date in Java](https://www.baeldung.com/java-file-creation-date)
+- [Determine File Creation Date in Java](https://www.baeldung.com/java-file-creation-date)

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

@@ -10,3 +10,4 @@
 - [SSL Handshake Failures](https://www.baeldung.com/java-ssl-handshake-failures)
 - [SHA-256 and SHA3-256 Hashing in Java](https://www.baeldung.com/sha-256-hashing-java)
 - [Enabling TLS v1.2 in Java 7](https://www.baeldung.com/java-7-tls-v12)
+- [The Java SecureRandom Class](https://www.baeldung.com/java-secure-random)

core-java-modules/pom.xml

@@ -17,6 +17,7 @@
         <module>pre-jpms</module>
         <module>core-java-exceptions</module>
         <module>core-java-optional</module>
+        <module>core-java-lang-operators</module>
         <module>core-java-networking-2</module>
     </modules>
     

data-structures/README.md

@@ -1,4 +1,5 @@
 ## Relevant articles:
 
-[The Trie Data Structure in Java](https://www.baeldung.com/trie-java)
-[Implementing a Binary Tree in Java](https://www.baeldung.com/java-binary-tree)
+- [The Trie Data Structure in Java](https://www.baeldung.com/trie-java)
+- [Implementing a Binary Tree in Java](https://www.baeldung.com/java-binary-tree)
+- [Depth First Search in Java](https://www.baeldung.com/java-depth-first-search)

intelliJ/intelliJ-formatter.xml

@@ -1,19 +1,15 @@
-<code_scheme name="baeldung">
+<code_scheme name="baeldung-formatter" version="173">
   <option name="RIGHT_MARGIN" value="260" />
-  <option name="ENABLE_JAVADOC_FORMATTING" value="false" />
   <option name="FORMATTER_TAGS_ENABLED" value="true" />
   <JavaCodeStyleSettings>
-    <option name="SPACE_AFTER_CLOSING_ANGLE_BRACKET_IN_TYPE_ARGUMENT" value="true" />
-    <option name="DO_NOT_WRAP_AFTER_SINGLE_ANNOTATION" value="true" />
-    <option name="ALIGN_MULTILINE_ANNOTATION_PARAMETERS" value="true" />
+    <option name="CLASS_COUNT_TO_USE_IMPORT_ON_DEMAND" value="500" />
+    <option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="300" />
+    <option name="ENABLE_JAVADOC_FORMATTING" value="false" />
   </JavaCodeStyleSettings>
-  <JetCodeStyleSettings>
-    <option name="NAME_COUNT_TO_USE_STAR_IMPORT" value="99" />
-    <option name="NAME_COUNT_TO_USE_STAR_IMPORT_FOR_MEMBERS" value="99" />
-  </JetCodeStyleSettings>
   <codeStyleSettings language="JAVA">
     <option name="KEEP_LINE_BREAKS" value="false" />
     <option name="KEEP_FIRST_COLUMN_COMMENT" value="false" />
+    <option name="KEEP_CONTROL_STATEMENT_IN_ONE_LINE" value="false" />
     <option name="KEEP_BLANK_LINES_IN_DECLARATIONS" value="1" />
     <option name="KEEP_BLANK_LINES_IN_CODE" value="1" />
     <option name="KEEP_BLANK_LINES_BEFORE_RBRACE" value="1" />
@@ -29,19 +25,18 @@
     <option name="THROWS_LIST_WRAP" value="1" />
     <option name="EXTENDS_KEYWORD_WRAP" value="1" />
     <option name="THROWS_KEYWORD_WRAP" value="1" />
-    <option name="METHOD_CALL_CHAIN_WRAP" value="2" />
-    <option name="WRAP_FIRST_METHOD_IN_CALL_CHAIN" value="true" />
+    <option name="METHOD_CALL_CHAIN_WRAP" value="5" />
     <option name="BINARY_OPERATION_WRAP" value="1" />
     <option name="BINARY_OPERATION_SIGN_ON_NEXT_LINE" value="true" />
     <option name="TERNARY_OPERATION_WRAP" value="5" />
-    <option name="TERNARY_OPERATION_SIGNS_ON_NEXT_LINE" value="true" />
     <option name="ARRAY_INITIALIZER_WRAP" value="1" />
-    <option name="ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE" value="true" />
-    <option name="ARRAY_INITIALIZER_RBRACE_ON_NEXT_LINE" value="true" />
-    <option name="PLACE_ASSIGNMENT_SIGN_ON_NEXT_LINE" value="true" />
+    <option name="METHOD_ANNOTATION_WRAP" value="0" />
+    <option name="CLASS_ANNOTATION_WRAP" value="0" />
+    <option name="FIELD_ANNOTATION_WRAP" value="0" />
     <indentOptions>
-      <option name="CONTINUATION_INDENT_SIZE" value="2" />
-      <option name="TAB_SIZE" value="8" />
+      <option name="INDENT_SIZE" value="8" />
+      <option name="CONTINUATION_INDENT_SIZE" value="4" />
+      <option name="SMART_TABS" value="true" />
     </indentOptions>
   </codeStyleSettings>
 </code_scheme>

jackson-2/README.md

@@ -2,7 +2,7 @@
 
 ## Jackson Cookbooks and Examples
 
-###The Course
+### The Course
 The "REST With Spring" Classes: http://bit.ly/restwithspring
 
 ### Relevant Articles: 
@@ -10,3 +10,4 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 - [How to Process YAML with Jackson](https://www.baeldung.com/jackson-yaml)
 - [Working with Tree Model Nodes in Jackson](https://www.baeldung.com/jackson-json-node-tree-model)
 - [Converting JSON to CSV in Java](https://www.baeldung.com/java-converting-json-to-csv)
+- [Compare Two JSON Objects with Jackson](https://www.baeldung.com/jackson-compare-two-json-objects)

java-dates-2/README.md

@@ -1,3 +1,4 @@
 ## Relevant Articles:
 - [Converting Between LocalDate and XMLGregorianCalendar](https://www.baeldung.com/java-localdate-to-xmlgregoriancalendar)
 - [Convert Time to Milliseconds in Java](https://www.baeldung.com/java-time-milliseconds)
+- [Check If a String Is a Valid Date in Java](https://www.baeldung.com/java-string-valid-date)

java-dates/README.md

@@ -29,3 +29,4 @@
 - [A Guide to SimpleDateFormat](https://www.baeldung.com/java-simple-date-format)
 - [ZoneOffset in Java](https://www.baeldung.com/java-zone-offset)
 - [Differences Between ZonedDateTime and OffsetDateTime](https://www.baeldung.com/java-zoneddatetime-offsetdatetime)
+- [Introduction to Joda-Time](http://www.baeldung.com/joda-time)

java-math/pom.xml

@@ -17,6 +17,26 @@
             <artifactId>commons-math3</artifactId>
             <version>${commons-math3.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.ejml</groupId>
+            <artifactId>ejml-all</artifactId>
+            <version>${ejml.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.nd4j</groupId>
+            <artifactId>nd4j-native</artifactId>
+            <version>${nd4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.la4j</groupId>
+            <artifactId>la4j</artifactId>
+            <version>${la4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>colt</groupId>
+            <artifactId>colt</artifactId>
+            <version>${colt.version}</version>
+        </dependency>
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
@@ -44,6 +64,17 @@
             <artifactId>combinatoricslib3</artifactId>
             <version>${combinatoricslib3.version}</version>
          </dependency>
+        <!-- Benchmarking -->
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -64,6 +95,11 @@
         <commons-codec.version>1.11</commons-codec.version>
         <guava.version>27.0.1-jre</guava.version>
         <combinatoricslib3.version>3.3.0</combinatoricslib3.version>
+        <ejml.version>0.38</ejml.version>
+        <nd4j.version>1.0.0-beta4</nd4j.version>
+        <colt.version>1.2.0</colt.version>
+        <la4j.version>0.6.0</la4j.version>
+        <jmh.version>1.19</jmh.version>
     </properties>
 
 </project>

java-numbers-2/src/main/java/com/baeldung/binarynumbers/BinaryNumbers.java

@@ -1,148 +1,140 @@
-package com.baeldung.binarynumbers;
-
-public class BinaryNumbers {
-
-    /**
-     * This method takes a decimal number and convert it into a binary number.
-     * example:- input:10, output:1010
-     *
-     * @param decimalNumber
-     * @return binary number
-     */
-    public Integer convertDecimalToBinary(Integer decimalNumber) {
-
-        if (decimalNumber == 0) {
-            return decimalNumber;
-        }
-
-        StringBuilder binaryNumber = new StringBuilder();
-
-        while (decimalNumber > 0) {
-
-            int remainder = decimalNumber % 2;
-            int result = decimalNumber / 2;
-
-            binaryNumber.append(remainder);
-            decimalNumber = result;
-        }
-
-        binaryNumber = binaryNumber.reverse();
-
-        return Integer.valueOf(binaryNumber.toString());
-    }
-
-    /**
-     * This method takes a binary number and convert it into a decimal number.
-     * example:- input:101, output:5
-     *
-     * @param binary number
-     * @return decimal Number
-     */
-    public Integer convertBinaryToDecimal(Integer binaryNumber) {
-
-        Integer result = 0;
-        Integer base = 1;
-
-        while (binaryNumber > 0) {
-
-            int lastDigit = binaryNumber % 10;
-            binaryNumber = binaryNumber / 10;
-
-            result += lastDigit * base;
-
-            base = base * 2;
-        }
-        return result;
-    }
-
-    /**
-     * This method accepts two binary numbers and returns sum of input numbers.
-     * Example:- firstNum: 101, secondNum: 100, output: 1001
-     *
-     * @param firstNum
-     * @param secondNum
-     * @return addition of input numbers
-     */
-    public Integer addBinaryNumber(Integer firstNum, Integer secondNum) {
-
-        StringBuilder output = new StringBuilder();
-
-        int carry = 0;
-        int temp;
-
-        while (firstNum != 0 || secondNum != 0) {
-
-            temp = (firstNum % 10 + secondNum % 10 + carry) % 2;
-            output.append(temp);
-
-            carry = (firstNum % 10 + secondNum % 10 + carry) / 2;
-
-            firstNum = firstNum / 10;
-            secondNum = secondNum / 10;
-        }
-
-        if (carry != 0) {
-            output.append(carry);
-        }
-
-        return Integer.valueOf(output.reverse()
-            .toString());
-    }
-
-    /**
-    * This method takes two binary number as input and subtract second number from the first number.
-    * example:- firstNum: 1000, secondNum: 11, output: 101
-    * @param firstNum
-    * @param secondNum
-    * @return Result of subtraction of secondNum from first
-    */
-    public Integer substractBinaryNumber(Integer firstNum, Integer secondNum) {
-
-        int onesComplement = Integer.valueOf(getOnesComplement(secondNum));
-
-        StringBuilder output = new StringBuilder();
-
-        int carry = 0;
-        int temp;
-
-        while (firstNum != 0 || onesComplement != 0) {
-
-            temp = (firstNum % 10 + onesComplement % 10 + carry) % 2;
-            output.append(temp);
-
-            carry = (firstNum % 10 + onesComplement % 10 + carry) / 2;
-
-            firstNum = firstNum / 10;
-            onesComplement = onesComplement / 10;
-        }
-
-        String additionOfFirstNumAndOnesComplement = output.reverse()
-            .toString();
-
-        if (carry == 1) {
-            return addBinaryNumber(Integer.valueOf(additionOfFirstNumAndOnesComplement), carry);
-        } else {
-            return getOnesComplement(Integer.valueOf(additionOfFirstNumAndOnesComplement));
-        }
-
-    }
-
-    public Integer getOnesComplement(Integer num) {
-
-        StringBuilder onesComplement = new StringBuilder();
-
-        while (num > 0) {
-            int lastDigit = num % 10;
-            if (lastDigit == 0) {
-                onesComplement.append(1);
-            } else {
-                onesComplement.append(0);
-            }
-            num = num / 10;
-        }
-
-        return Integer.valueOf(onesComplement.reverse()
-            .toString());
-    }
-
-}
+package com.baeldung.binarynumbers;
+
+public class BinaryNumbers {
+
+    /**
+     * This method takes a decimal number and convert it into a binary number.
+     * example:- input:10, output:1010
+     *
+     * @param decimalNumber
+     * @return binary number
+     */
+    public Integer convertDecimalToBinary(Integer decimalNumber) {
+
+        if (decimalNumber == 0) {
+            return decimalNumber;
+        }
+
+        StringBuilder binaryNumber = new StringBuilder();
+        Integer quotient = decimalNumber;
+
+        while (quotient > 0) {
+
+            int remainder = quotient % 2;
+            binaryNumber.append(remainder);
+            quotient /= 2;
+        }
+
+        binaryNumber = binaryNumber.reverse();
+        return Integer.valueOf(binaryNumber.toString());
+    }
+
+    /**
+     * This method takes a binary number and convert it into a decimal number.
+     * example:- input:101, output:5
+     *
+     * @param binary number
+     * @return decimal Number
+     */
+    public Integer convertBinaryToDecimal(Integer binaryNumber) {
+
+        Integer decimalNumber = 0;
+        Integer base = 1;
+
+        while (binaryNumber > 0) {
+
+            int lastDigit = binaryNumber % 10;
+            binaryNumber = binaryNumber / 10;
+
+            decimalNumber += lastDigit * base;
+            base = base * 2;
+        }
+        return decimalNumber;
+    }
+
+    /**
+     * This method accepts two binary numbers and returns sum of input numbers.
+     * Example:- firstNum: 101, secondNum: 100, output: 1001
+     *
+     * @param firstNum
+     * @param secondNum
+     * @return addition of input numbers
+     */
+    public Integer addBinaryNumber(Integer firstNum, Integer secondNum) {
+
+        StringBuilder output = new StringBuilder();
+
+        int carry = 0;
+        int temp;
+
+        while (firstNum != 0 || secondNum != 0) {
+
+            temp = (firstNum % 10 + secondNum % 10 + carry) % 2;
+            output.append(temp);
+
+            carry = (firstNum % 10 + secondNum % 10 + carry) / 2;
+
+            firstNum = firstNum / 10;
+            secondNum = secondNum / 10;
+        }
+
+        if (carry != 0) {
+            output.append(carry);
+        }
+
+        return Integer.valueOf(output.reverse()
+            .toString());
+    }
+
+    /**
+    * This method takes two binary number as input and subtract second number from the first number.
+    * example:- firstNum: 1000, secondNum: 11, output: 101
+    * @param firstNum
+    * @param secondNum
+    * @return Result of subtraction of secondNum from first
+    */
+    public Integer substractBinaryNumber(Integer firstNum, Integer secondNum) {
+
+        int onesComplement = Integer.valueOf(getOnesComplement(secondNum));
+        StringBuilder output = new StringBuilder();
+        int carry = 0;
+        int temp;
+
+        while (firstNum != 0 || onesComplement != 0) {
+
+            temp = (firstNum % 10 + onesComplement % 10 + carry) % 2;
+            output.append(temp);
+
+            carry = (firstNum % 10 + onesComplement % 10 + carry) / 2;
+
+            firstNum = firstNum / 10;
+            onesComplement = onesComplement / 10;
+        }
+
+        String additionOfFirstNumAndOnesComplement = output.reverse()
+            .toString();
+
+        if (carry == 1) {
+            return addBinaryNumber(Integer.valueOf(additionOfFirstNumAndOnesComplement), carry);
+        } else {
+            return getOnesComplement(Integer.valueOf(additionOfFirstNumAndOnesComplement));
+        }
+    }
+
+    public Integer getOnesComplement(Integer num) {
+
+        StringBuilder onesComplement = new StringBuilder();
+        while (num > 0) {
+            int lastDigit = num % 10;
+            if (lastDigit == 0) {
+                onesComplement.append(1);
+            } else {
+                onesComplement.append(0);
+            }
+            num = num / 10;
+        }
+        return Integer.valueOf(onesComplement.reverse()
+            .toString());
+    }
+
+}

java-strings-2/README.md

@@ -1,4 +1,4 @@
-## Relevant Articles
+## Relevant Articles:
 
 - [Java Localization – Formatting Messages](https://www.baeldung.com/java-localization-messages-formatting)
 - [Check If a String Contains a Substring](https://www.baeldung.com/java-string-contains-substring)
@@ -18,5 +18,8 @@
 - [Java String Interview Questions and Answers](https://www.baeldung.com/java-string-interview-questions)
 - [Check if a String is a Pangram in Java](https://www.baeldung.com/java-string-pangram)
 - [Check If a String Contains Multiple Keywords](https://www.baeldung.com/string-contains-multiple-words)
-- [Blank and Empty Strings in Java](https://www.baeldung.com/java-blank-empty-strings)
+- [Checking for Empty or Blank Strings in Java](https://www.baeldung.com/java-blank-empty-strings)
 - [String Initialization in Java](https://www.baeldung.com/java-string-initialization)
+- [Java Multi-line String](https://www.baeldung.com/java-multiline-string)
+- [Checking If a String Is a Repeated Substring](https://www.baeldung.com/java-repeated-substring)
+- [How to Reverse a String in Java](https://www.baeldung.com/java-reverse-string)

libraries-2/README.md

@@ -1,5 +1,4 @@
-
-### Relevant Articles: 
+## Relevant Articles: 
 
 - [A Guide to jBPM with Java](https://www.baeldung.com/jbpm-java)
 - [Guide to Classgraph Library](https://www.baeldung.com/classgraph)
@@ -8,3 +7,7 @@
 - [Templating with Handlebars](https://www.baeldung.com/handlebars)
 - [A Guide to Crawler4j](https://www.baeldung.com/crawler4j)
 - [Decode an OkHttp JSON Response](https://www.baeldung.com/okhttp-json-response)
+- [Key Value Store with Chronicle Map](https://www.baeldung.com/java-chronicle-map)
+- [Matrix Multiplication in Java](https://www.baeldung.com/java-matrix-multiplication)
+- [Guide to MapDB](https://www.baeldung.com/mapdb)
+- [A Guide to Apache Mesos](https://www.baeldung.com/apache-mesos)

libraries-2/pom.xml

@@ -59,26 +59,6 @@
             <artifactId>picocli</artifactId>
             <version>${picocli.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.ejml</groupId>
-            <artifactId>ejml-all</artifactId>
-            <version>${ejml.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.nd4j</groupId>
-            <artifactId>nd4j-native</artifactId>
-            <version>${nd4j.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.la4j</groupId>
-            <artifactId>la4j</artifactId>
-            <version>${la4j.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>colt</groupId>
-            <artifactId>colt</artifactId>
-            <version>${colt.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter</artifactId>
@@ -127,17 +107,6 @@
             <artifactId>handlebars</artifactId>
             <version>${handlebars.version}</version>
         </dependency>
-        <!-- Benchmarking -->
-        <dependency>
-            <groupId>org.openjdk.jmh</groupId>
-            <artifactId>jmh-core</artifactId>
-            <version>${jmh.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.openjdk.jmh</groupId>
-            <artifactId>jmh-generator-annprocess</artifactId>
-            <version>${jmh.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.apache.mesos</groupId>
             <artifactId>mesos</artifactId>
@@ -160,11 +129,6 @@
         <chronicle.map.version>3.17.2</chronicle.map.version>
         <crawler4j.version>4.4.0</crawler4j.version>
         <spring-boot-starter.version>2.1.4.RELEASE</spring-boot-starter.version>
-        <ejml.version>0.38</ejml.version>
-        <nd4j.version>1.0.0-beta4</nd4j.version>
-        <colt.version>1.2.0</colt.version>
-        <la4j.version>0.6.0</la4j.version>
-        <jmh.version>1.19</jmh.version>
         <mesos.library.version>0.28.3</mesos.library.version>
         <parallel-collectors.version>1.1.0</parallel-collectors.version>
         <okhttp.version>3.14.2</okhttp.version>

libraries-data-2/README.md

@@ -0,0 +1,11 @@
+### Relevant articles
+- [Introduction to Apache Flink with Java](http://www.baeldung.com/apache-flink)
+- [Guide to the HyperLogLog Algorithm](http://www.baeldung.com/java-hyperloglog)
+- [Introduction to Conflict-Free Replicated Data Types](http://www.baeldung.com/java-conflict-free-replicated-data-types)
+- [Introduction to javax.measure](http://www.baeldung.com/javax-measure)
+- [Introduction To Docx4J](http://www.baeldung.com/docx4j)
+- [Interact with Google Sheets from Java](http://www.baeldung.com/google-sheets-java-client)
+- [Introduction To OpenCSV](http://www.baeldung.com/opencsv)
+- [Introduction to Smooks](http://www.baeldung.com/smooks)
+- [A Guide to Infinispan in Java](http://www.baeldung.com/infinispan)
+

libraries-data-2/log4j.properties

@@ -0,0 +1 @@
+log4j.rootLogger=INFO, stdout

libraries-data-2/pom.xml

@@ -0,0 +1,145 @@
+<?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>libraries-data-2</artifactId>
+    <name>libraries-data-2</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.flink</groupId>
+            <artifactId>flink-connector-kafka-0.11_2.11</artifactId>
+            <version>${flink.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.flink</groupId>
+            <artifactId>flink-streaming-java_2.11</artifactId>
+            <version>${flink.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.flink</groupId>
+            <artifactId>flink-core</artifactId>
+            <version>${flink.version}</version>
+            <exclusions>
+                <exclusion>
+                    <artifactId>commons-logging</artifactId>
+                    <groupId>commons-logging</groupId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.flink</groupId>
+            <artifactId>flink-java</artifactId>
+            <version>${flink.version}</version>
+            <exclusions>
+                <exclusion>
+                    <artifactId>commons-logging</artifactId>
+                    <groupId>commons-logging</groupId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.flink</groupId>
+            <artifactId>flink-test-utils_2.11</artifactId>
+            <version>${flink.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>net.agkn</groupId>
+            <artifactId>hll</artifactId>
+            <version>${hll.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.netopyr.wurmloch</groupId>
+            <artifactId>wurmloch-crdt</artifactId>
+            <version>${crdt.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>tec.units</groupId>
+            <artifactId>unit-ri</artifactId>
+            <version>${unit-ri.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.xml.bind</groupId>
+            <artifactId>jaxb-api</artifactId>
+            <version>${jaxb-api.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.docx4j</groupId>
+            <artifactId>docx4j</artifactId>
+            <version>${docx4j.version}</version>
+        </dependency>
+        <!-- google api -->
+        <dependency>
+            <groupId>com.google.api-client</groupId>
+            <artifactId>google-api-client</artifactId>
+            <version>${google-api.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.oauth-client</groupId>
+            <artifactId>google-oauth-client-jetty</artifactId>
+            <version>${google-api.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.apis</groupId>
+            <artifactId>google-api-services-sheets</artifactId>
+            <version>${google-sheets.version}</version>
+        </dependency>
+        <!-- https://mvnrepository.com/artifact/com.opencsv/opencsv -->
+        <dependency>
+            <groupId>com.opencsv</groupId>
+            <artifactId>opencsv</artifactId>
+            <version>${opencsv.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.milyn</groupId>
+            <artifactId>milyn-smooks-all</artifactId>
+            <version>${smooks.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.infinispan</groupId>
+            <artifactId>infinispan-core</artifactId>
+            <version>${infinispan.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.datatype</groupId>
+            <artifactId>jackson-datatype-jsr310</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-web</artifactId>
+            <version>${spring.version}</version>
+        </dependency>
+
+    </dependencies>
+
+    <properties>
+        <flink.version>1.5.0</flink.version>
+        <hll.version>1.6.0</hll.version>
+        <crdt.version>0.1.0</crdt.version>
+        <unit-ri.version>1.0.3</unit-ri.version>
+        <docx4j.version>3.3.5</docx4j.version>
+        <jaxb-api.version>2.1</jaxb-api.version>
+        <google-api.version>1.23.0</google-api.version>
+        <opencsv.version>4.1</opencsv.version>
+        <smooks.version>1.7.0</smooks.version>
+        <infinispan.version>9.1.5.Final</infinispan.version>
+        <google-sheets.version>v4-rev493-1.21.0</google-sheets.version>
+        <jackson.version>2.9.8</jackson.version>
+        <spring.version>4.3.8.RELEASE</spring.version>
+    </properties>
+</project>

libraries-data-2/src/main/java/com/baeldung/docx/Docx4jExample.java

@@ -0,0 +1,105 @@
+package com.baeldung.docx;
+
+import org.docx4j.dml.wordprocessingDrawing.Inline;
+import org.docx4j.jaxb.Context;
+import org.docx4j.model.table.TblFactory;
+import org.docx4j.openpackaging.exceptions.Docx4JException;
+import org.docx4j.openpackaging.packages.WordprocessingMLPackage;
+import org.docx4j.openpackaging.parts.WordprocessingML.BinaryPartAbstractImage;
+import org.docx4j.openpackaging.parts.WordprocessingML.MainDocumentPart;
+import org.docx4j.wml.BooleanDefaultTrue;
+import org.docx4j.wml.Color;
+import org.docx4j.wml.Drawing;
+import org.docx4j.wml.ObjectFactory;
+import org.docx4j.wml.P;
+import org.docx4j.wml.R;
+import org.docx4j.wml.RPr;
+import org.docx4j.wml.Tbl;
+import org.docx4j.wml.Tc;
+import org.docx4j.wml.Text;
+import org.docx4j.wml.Tr;
+
+import javax.xml.bind.JAXBElement;
+import javax.xml.bind.JAXBException;
+import java.io.File;
+import java.nio.file.Files;
+import java.util.List;
+
+class Docx4jExample {
+
+    void createDocumentPackage(String outputPath, String imagePath) throws Exception {
+        WordprocessingMLPackage wordPackage = WordprocessingMLPackage.createPackage();
+        MainDocumentPart mainDocumentPart = wordPackage.getMainDocumentPart();
+        mainDocumentPart.addStyledParagraphOfText("Title", "Hello World!");
+        mainDocumentPart.addParagraphOfText("Welcome To Baeldung!");
+
+        ObjectFactory factory = Context.getWmlObjectFactory();
+        P p = factory.createP();
+        R r = factory.createR();
+        Text t = factory.createText();
+        t.setValue("Welcome To Baeldung");
+        r.getContent().add(t);
+        p.getContent().add(r);
+        RPr rpr = factory.createRPr();
+        BooleanDefaultTrue b = new BooleanDefaultTrue();
+        rpr.setB(b);
+        rpr.setI(b);
+        rpr.setCaps(b);
+        Color red = factory.createColor();
+        red.setVal("green");
+        rpr.setColor(red);
+        r.setRPr(rpr);
+        mainDocumentPart.getContent().add(p);
+
+        File image = new File(imagePath);
+        byte[] fileContent = Files.readAllBytes(image.toPath());
+        BinaryPartAbstractImage imagePart = BinaryPartAbstractImage.createImagePart(wordPackage, fileContent);
+        Inline inline = imagePart.createImageInline("Baeldung Image", "Alt Text", 1, 2, false);
+        P Imageparagraph = addImageToParagraph(inline);
+        mainDocumentPart.getContent().add(Imageparagraph);
+
+        int writableWidthTwips = wordPackage.getDocumentModel().getSections().get(0).getPageDimensions().getWritableWidthTwips();
+        int columnNumber = 3;
+        Tbl tbl = TblFactory.createTable(3, 3, writableWidthTwips / columnNumber);
+        List<Object> rows = tbl.getContent();
+        for (Object row : rows) {
+            Tr tr = (Tr) row;
+            List<Object> cells = tr.getContent();
+            for (Object cell : cells) {
+                Tc td = (Tc) cell;
+                td.getContent().add(p);
+            }
+        }
+
+        mainDocumentPart.getContent().add(tbl);
+        File exportFile = new File(outputPath);
+        wordPackage.save(exportFile);
+    }
+
+    boolean isTextExist(String testText) throws Docx4JException, JAXBException {
+        File doc = new File("helloWorld.docx");
+        WordprocessingMLPackage wordMLPackage = WordprocessingMLPackage.load(doc);
+        MainDocumentPart mainDocumentPart = wordMLPackage.getMainDocumentPart();
+        String textNodesXPath = "//w:t";
+        List<Object> paragraphs = mainDocumentPart.getJAXBNodesViaXPath(textNodesXPath, true);
+        for (Object obj : paragraphs) {
+            Text text = (Text) ((JAXBElement) obj).getValue();
+            String textValue = text.getValue();
+            if (textValue != null && textValue.contains(testText)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private static P addImageToParagraph(Inline inline) {
+        ObjectFactory factory = new ObjectFactory();
+        P p = factory.createP();
+        R r = factory.createR();
+        p.getContent().add(r);
+        Drawing drawing = factory.createDrawing();
+        r.getContent().add(drawing);
+        drawing.getAnchorOrInline().add(inline);
+        return p;
+    }
+}