Summary coding

1. Reverse a String
public class ReverseString {

public static void main(String[] args) {

String str = "Automation";

StringBuilder reversed = new StringBuilder(str).reverse();

System.out.println(reversed);

}

}


2. Check for Palindrome
public class Palindrome {

public static void main(String[] args) {

String str = "madam";

String reversed = new StringBuilder(str).reverse().toString();

System.out.println(str.equals(reversed));

}

}


3. Fibonacci Series
public class Fibonacci {

public static void main(String[] args) {

int n = 10, num1 = 0, num2 = 1;

System.out.print("Fibonacci Series: " + num1 + ", " + num2);

for (int i = 2; i < n; i++) {

int num3 = num1 + num2;

System.out.print(", " + num3);

num1 = num2;

num2 = num3;

}

}

,}


4. Factorial of a Number
public class Factorial {

public static void main(String[] args) {

int num = 5, factorial = 1;

for (int i = 1; i <= num; i++) {

factorial *= i;

}

System.out.println(factorial);

}

}


5. Prime Number Check
public class PrimeCheck {

public static void main(String[] args) {

int num = 11;

boolean isPrime = true;

for (int i = 2; i <= Math.sqrt(num); i++) {

if (num % i == 0) {

isPrime = false;

break;

}

}

System.out.println(isPrime);

}

}


6. Count Vowels and Consonants
public class VowelConsonantCount {

public static void main(String[] args) {

String str = "Automation";

, int vowels = 0, consonants = 0;

for (char c : str.toCharArray()) {

if ("aeiouAEIOU".indexOf(c) != -1) {

vowels++;

} else if (Character.isLetter(c)) {

consonants++;

}

}

System.out.println("Vowels: " + vowels + ", Consonants: " + consonants);

}

}


7. Sort an Array
import java.util.Arrays;

public class SortArray {

public static void main(String[] args) {

int[] arr = {5, 2, 8, 1, 3};

Arrays.sort(arr);

System.out.println(Arrays.toString(arr));

}

}


8. Merge Two Arrays
import java.util.Arrays;

public class MergeArrays {

public static void main(String[] args) {

int[] arr1 = {1, 3, 5};

int[] arr2 = {2, 4, 6};

int[] merged = new int[arr1.length + arr2.length];

System.arraycopy(arr1, 0, merged, 0, arr1.length);

System.arraycopy(arr2, 0, merged, arr1.length, arr2.length);