Add Binary Search implementation in Java

BinarySearch.java

@@ -0,0 +1,36 @@
+public class BinarySearch {
+
+    // Time Complexity: O(log n)
+    // Space Complexity: O(1)
+    // Note: Array must be sorted
+
+    public static int binarySearch(int[] arr, int target) {
+        int left = 0, right = arr.length - 1;
+
+        while (left <= right) {
+            int mid = left + (right - left) / 2;
+
+            if (arr[mid] == target) {
+                return mid;
+            } else if (arr[mid] < target) {
+                left = mid + 1;
+            } else {
+                right = mid - 1;
+            }
+        }
+        return -1;
+    }
+
+    public static void main(String[] args) {
+        int[] arr = {2, 4, 6, 8, 10};
+        int target = 8;
+
+        int result = binarySearch(arr, target);
+
+        if (result != -1) {
+            System.out.println("Element found at index " + result);
+        } else {
+            System.out.println("Element not found ");
+        }
+    }
+}

README.md

@@ -1,3 +1,7 @@
 # Programming_Hactoberfest23
 New Contribution Repository
 https://github.com/Nikhil-2002/hacktoberfest2025-contributions
+
+### Java Algorithms
+- Binary Search (BinarySearch.java)
+