Add FindInArray program for number search

Findarray.java

@@ -0,0 +1,56 @@
+/*
+ * FindInArray.java
+ * ----------------
+ * Simple Java program to find a given number in an array.
+ *
+ * Features:
+ *  - Takes user input for array size and elements
+ *  - Searches for a target number (linear search)
+ *  - Prints all positions where the number occurs
+ *  - Clean and easy to understand — great Hacktoberfest contribution
+ *
+ * Author: <Your Name>
+ * Hacktoberfest 2025 Contribution
+ * License: MIT
+ */
+
+import java.util.*;
+
+public class FindInArray {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+
+        System.out.println("🔍 Find Number in Array - Hacktoberfest 2025 Edition 🔍");
+        System.out.print("Enter number of elements: ");
+        int n = sc.nextInt();
+
+        if (n <= 0) {
+            System.out.println("Array size must be positive!");
+            return;
+        }
+
+        int[] arr = new int[n];
+        System.out.println("Enter " + n + " integers:");
+        for (int i = 0; i < n; i++) {
+            arr[i] = sc.nextInt();
+        }
+
+        System.out.print("Enter the number to find: ");
+        int target = sc.nextInt();
+
+        List<Integer> positions = new ArrayList<>();
+        for (int i = 0; i < n; i++) {
+            if (arr[i] == target) {
+                positions.add(i); // store index
+            }
+        }
+
+        if (positions.isEmpty()) {
+            System.out.println("❌ Number " + target + " not found in the array.");
+        } else {
+            System.out.println("✅ Number " + target + " found at position(s): " + positions);
+        }
+
+        sc.close();
+    }
+}