01_ Coding: String reverse ............

 String reverse

Method 1. 

public static void main(String[] args){

        String input = "GeeksForGeeks";

        // convert String to character array

        // by using toCharArray

        char[] try1 = input.toCharArray();

 

        for (int i = try1.length - 1; i >= 0; i--)

            System.out.print(try1[i]);

    }

Method 2. 

public static void main (String[] args) {

        String str= "Geeks";

        String nstr="";

        char ch;

      System.out.print("Original word: ");

      System.out.println("Geeks"); //Example word

      for (int i=0; i<str.length(); i++)

      {

        ch= str.charAt(i); //extracts each character

        nstr= ch+nstr; //adds each character in front of the existing string

      }

      System.out.println("Reversed word: "+ nstr);

    }

Method 3.

 public static void main(String[] args)

    {

        String str = "Geeks";

        // conversion from String object to StringBuffer

        StringBuffer sbr = new StringBuffer(str);

        // To reverse the string

        sbr.reverse();

        System.out.println(sbr);

    }

Method 4.

public static void main(String[] args) {

        String input = "Geeks for Geeks";

        StringBuilder input1 = new StringBuilder();

        input1.append(input);

        input1.reverse();

        System.out.println(input1);

    }

Print a to z 

public static void main(String[] args) {

    char c;

    for (c = 'a'; c <= 'z'; c++) {

        System.out.print(c + ", ");

    }

} 

Rendom num generation with bound

public static void main(String[] args) {

    int min=4;
    int max =10;
        int num = (int)(Math.random()*(max-min-1)+min);
        System.out.println("random usint Math.random method " +num);
        Random rn = new Random();
        int ny= rn.nextInt(max-min-1)+min;
    System.out.println("random usint random Class " +ny);

    }

Date and time formate

//Formatting Date/Time to String:
LocalDateTime now = LocalDateTime.now();
DateTimeFormatter formatter2 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
String formattedDateTime = now.format(formatter2);
System.out.println(formattedDateTime);
//Parsing String to Date/Time:
String dateTimeString = "02-03-2024 14:30:00";
DateTimeFormatter formatter3 = DateTimeFormatter.ofPattern("MM-dd-yyyy HH:mm:ss");
LocalDateTime parsedDateTime = LocalDateTime.parse(dateTimeString, formatter3);
System.out.println(parsedDateTime);