Add Linear Search algorithm in Java with comments

Author: Farheen Shabbir Shaikh

Search/LinearSearch.java

@@ -0,0 +1,30 @@
+/**
+ * LinearSearch.java
+ * This program implements the Linear Search algorithm.
+ * Time Complexity: O(n)
+ */
+
+public class LinearSearch {
+
+    public static int linearSearch(int[] arr, int target) {
+        // Traverse each element in the array
+        for (int i = 0; i < arr.length; i++) {
+            if (arr[i] == target) {
+                return i; // Found the target at index i
+            }
+        }
+        return -1; // Target not found
+    }
+
+    public static void main(String[] args) {
+        int[] numbers = {5, 8, 12, 20, 35};
+        int target = 20;
+
+        int index = linearSearch(numbers, target);
+        if (index != -1) {
+            System.out.println("Target " + target + " found at index: " + index);
+        } else {
+            System.out.println("Target " + target + " not found in the array.");
+        }
+    }
+}