BAEL-6226 Calculate Pi Java Program (#13693)

* BAEL-6226 Calculate Pi Java Program

* BAEL-6226 Calculate Pi Java Program

core-java-modules/core-java-numbers-6/README.md

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+### Relevant Articles:
+

core-java-modules/core-java-numbers-6/pom.xml

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+<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>core-java-numbers-6</artifactId>
+    <name>core-java-numbers-6</name>
+    <packaging>jar</packaging>
+
+      <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        
+    </dependencies>
+
+    <build>
+        <finalName>core-java-numbers-6</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+</project>

core-java-modules/core-java-numbers-6/src/test/java/com/baeldung/pi/PiProgramUnitTest.java

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+package com.baeldung.pi;
+
+import static org.junit.Assert.*;
+
+import java.util.Random;
+import org.junit.Test;
+
+public class PiProgramUnitTest {
+
+    @Test
+    public void givenPiCalculator_whenCalculatePiWithTenThousandPoints_thenEstimatedPiIsWithinTolerance() {
+        int totalPoints = 10000;
+        int insideCircle = 0;
+
+        Random random = new Random();
+
+        for (long i = 0; i < totalPoints; i++) {
+            double x = random.nextDouble() * 2 - 1;
+            double y = random.nextDouble() * 2 - 1;
+
+            if (x * x + y * y <= 1) {
+                insideCircle++;
+            }
+
+        }
+        double pi = 4.0 * insideCircle / totalPoints;
+
+        assertEquals(Math.PI, pi, 0.01);
+    }
+
+}

core-java-modules/pom.xml

@@ -115,6 +115,7 @@
         <module>core-java-numbers-3</module>
         <module>core-java-numbers-4</module>
         <module>core-java-numbers-5</module>
+        <module>core-java-numbers-6</module>
         <module>core-java-optional</module>
         <module>core-java-perf</module>
         <module>core-java-reflection</module>