💻 *Java Coding Challenges – Part 2* 🔥 *6️⃣ 🔄 Swap Two Numbers Without Using 3rd Variable* *Task:* Write a function to swap two numbers without a temp variable. ``` public static void swap(int a, int b) { System.out.println("Before Swap: a = " + a + ", b = " + b); a = a + b; b = a - b; a = a - b; System.out.println("After Swap: a = " + a + ", b = " + b); } ``` *7️⃣ 📊 Count Vowels and Consonants in a String* *Task:* Count the number of vowels and consonants in a given string. ``` public static void countVC(String str) { str = str.toLowerCase(); int vowels = 0, consonants = 0; for (char c : str.toCharArray()) { if (Character.isLetter(c)) { if ("aeiou".indexOf(c) != -1) vowels++; else consonants++; } } System.out.println("Vowels: " + vowels + ", Consonants: " + consonants); } ``` *8️⃣ 📐 Fibonacci Series Using Recursion* *Task:* Generate nth Fibonacci number using recursion. ``` public static int fibonacci(int n) { if (n <= 1) return n; return fibonacci(n - 1) + fibonacci(n - 2); } ``` *9️⃣ 🧮 Check Prime Number* *Task:* Determine if a number is prime. ``` public static boolean isPrime(int n) { if (n <= 1) return false; for (int i = 2; i <= Math.sqrt(n); i++) { if (n % i == 0) return false; } return true; } ``` *🔟 🔢 Sum of Digits of a Number* *Task:* Find the sum of all digits in an integer. ``` public static int sumDigits(int n) { int sum = 0; while (n != 0) { sum += n % 10; n /= 10; } return sum; } ``` *Double Tap ❤️ for more!*