feat: Add SumElementsVarargs to calculate sum of integers using varargs

WHAT the code does:
Defines a SumElementsVarargs class with a sum(int... A) method:
- Accepts a variable number of integer arguments (varargs).
- Iterates through them, accumulating a total sum.
- Returns the computed result.
main() demonstrates usage by summing 1, 2, 3, 4, 5 → result = 15.

WHY this matters:
Showcases Java varargs, which simplify APIs by allowing flexible numbers of arguments without overloading.
Demonstrates iteration over varargs using a traditional for loop.
Encapsulates reusable logic in a method that adapts to different input sizes.
Provides a concise alternative to array-based summation.

HOW it works:
When obj.sum(1, 2, 3, 4, 5) is called:
- Java internally creates an int[] array {1, 2, 3, 4, 5}.
- The method iterates from index 0 to A.length-1, adding elements to total.
- Returns 15, which is printed in main().

Tips and gotchas:
Varargs are syntactic sugar for arrays; at runtime, an array is always created.
Be cautious when mixing varargs with other parameters—varargs must come last in the method signature.
If no arguments are passed, A.length == 0 and total will remain 0.
For performance-sensitive cases with frequent calls, repeated array creation may be costly.

Use-cases:
Utility function for summing numbers without requiring manual array creation.
Educational demonstration of varargs in Java.
Foundation for building statistical helpers (average, min, max) using varargs.
Simplifies method calls in APIs that handle flexible input sizes.

Short key: class-sumelementsvarargs varargs integer-sum.

Signed-off-by: https://github.com/Someshdiwan <[email protected]>

Author: Someshdiwan

Section10Methods/src/SumElementsVarargs.java

@@ -1,23 +1,17 @@
-public class SumElementsVarargs
-{
+public class SumElementsVarargs {
     // Method to sum elements using varargs
-    int sum(int... A)
+    int sum(int... A) {
+        int total = 0; // Initialize total sum.
 
-    {
-        int total = 0; // Initialize total sum
-        for (int i = 0; i < A.length; i++)
-        {
+        for (int i = 0; i < A.length; i++) {
             total += A[i]; // Add each element to total
         }
         return total; // Return the total sum
     }
-
-    public static void main(String[] args)
-    {
+    public static void main(String[] args) {
         SumElementsVarargs obj = new SumElementsVarargs();
 
-        // Example usage
         int result = obj.sum(1, 2, 3, 4, 5); // Passing multiple integers
         System.out.println("Sum: " + result); // Should print "Sum: 15"
     }
-}
+}