Added SphereCircumference class (20170136)

GitAssignmentObserver.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <output url="file://$MODULE_DIR$/bin" />
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="inheritedJdk" />
+  </component>
+</module>

src/LucasSeries.java

@@ -0,0 +1,20 @@
+public class LucasSeries implements ISubscriber {
+    @Override
+    public void notifySubscriber(String input) {
+        try {
+            int LucasIndex = Integer.parseInt(input);
+            System.out.println("Lucas Number is: " + Lucas(LucasIndex));
+        } catch (Exception e) {
+            System.out.println("Error: " + e.getMessage());
+        }
+    }
+
+    int Lucas(int idx) throws Exception {
+        if (idx <= 0) throw new Exception("Error: Lucas applied only for positive numbers.");
+        return Lucas(idx, 1, 2); // Lucas series 2 1 3 4 7 11 18 29
+    }
+
+    private int Lucas(int idx, int value, int previous) {
+        return (idx == 1 ? previous : Lucas(idx - 1, previous + value, value));
+    }
+}

src/Main.java

@@ -2,8 +2,8 @@
 
 public class Main {
 	private static ISubscriber subscribers [] = {
-			new SimpleSubscriber(),
-			new ReallySimpleSubscriber(),
+			new SphereArea(), new LucasSeries() , new SphereCircumference()
+
 	};
 	public static void main(String[] args) {
 		Topic mathTopic = new Topic();

src/SphereArea.java

@@ -0,0 +1,13 @@
+public class SphereArea implements ISubscriber {
+        static float pi = 3.14159f;
+        @Override
+        public void notifySubscriber(String input) {
+
+            double Radius = Double.valueOf(input);
+            System.out.println( "Sphere Area = "+Calculate_Area(Radius));
+        }
+        double Calculate_Area(double radius){
+            return (4 * pi * radius * radius);
+        }
+
+    }

src/SphereCircumference.java

@@ -0,0 +1,18 @@
+public class SphereCircumference implements ISubscriber{
+    @Override
+    public void notifySubscriber(String input)
+    {
+        try
+        {
+            double radius = Double.parseDouble(input);
+
+            double circumference = (2 * Math.PI * radius);
+
+            System.out.println("Sphere Circumference = " + circumference);
+        }
+        catch (Exception e)
+        {
+            System.out.println("Exception: " + e);
+        }
+    }
+}