diff --git a/java-numbers-4/pom.xml b/java-numbers-4/pom.xml
new file mode 100644
index 0000000000..e1722fb039
--- /dev/null
+++ b/java-numbers-4/pom.xml
@@ -0,0 +1,52 @@
+<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>java-numbers-4</artifactId>
+    <name>java-numbers-4</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>
+        <dependency>
+            <groupId>io.vavr</groupId>
+            <artifactId>vavr</artifactId>
+            <version>${vavr.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>java-numbers-4</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <properties>
+        <vavr.version>0.10.2</vavr.version>
+        <commons.version>3.9</commons.version>
+        <assertj.version>3.6.1</assertj.version>
+    </properties>
+
+</project>
diff --git a/java-numbers-3/src/main/java/com/baeldung/probability/MaleHeightGenerator.java b/java-numbers-4/src/main/java/com/baeldung/probability/MaleHeightGenerator.java
similarity index 100%
rename from java-numbers-3/src/main/java/com/baeldung/probability/MaleHeightGenerator.java
rename to java-numbers-4/src/main/java/com/baeldung/probability/MaleHeightGenerator.java
diff --git a/java-numbers-3/src/main/java/com/baeldung/probability/RandomInvoker.java b/java-numbers-4/src/main/java/com/baeldung/probability/RandomInvoker.java
similarity index 100%
rename from java-numbers-3/src/main/java/com/baeldung/probability/RandomInvoker.java
rename to java-numbers-4/src/main/java/com/baeldung/probability/RandomInvoker.java
diff --git a/java-numbers-3/src/test/java/com/baeldung/probability/RandomInvokerUnitTest.java b/java-numbers-4/src/test/java/com/baeldung/probability/RandomInvokerUnitTest.java
similarity index 100%
rename from java-numbers-3/src/test/java/com/baeldung/probability/RandomInvokerUnitTest.java
rename to java-numbers-4/src/test/java/com/baeldung/probability/RandomInvokerUnitTest.java