Change project structure to a Maven Java project + Refactor (#2816)

src/main/java/com/thealgorithms/conversions/OctalToDecimal.java

@@ -0,0 +1,47 @@
+package com.thealgorithms.conversions;
+
+import java.util.Scanner;
+
+/**
+ * Converts any Octal Number to a Decimal Number
+ *
+ * @author Zachary Jones
+ */
+public class OctalToDecimal {
+
+    /**
+     * Main method
+     *
+     * @param args Command line arguments
+     */
+    public static void main(String args[]) {
+        Scanner sc = new Scanner(System.in);
+        System.out.print("Octal Input: ");
+        String inputOctal = sc.nextLine();
+        int result = convertOctalToDecimal(inputOctal);
+        if (result != -1) {
+            System.out.println("Result convertOctalToDecimal : " + result);
+        }
+        sc.close();
+    }
+
+    /**
+     * This method converts an octal number to a decimal number.
+     *
+     * @param inputOctal The octal number
+     * @return The decimal number
+     */
+    public static int convertOctalToDecimal(String inputOctal) {
+
+        try {
+            // Actual conversion of Octal to Decimal:
+            Integer outputDecimal = Integer.parseInt(inputOctal, 8);
+            return outputDecimal;
+        } catch (NumberFormatException ne) {
+            // Printing a warning message if the input is not a valid octal
+            // number:
+            System.out.println("Invalid Input, Expecting octal number 0-7");
+            return -1;
+        }
+    }
+}