Java program to find length of given string and convert it in to upper or lower case.

import java.util.Scanner;

public class StringCaseConverter {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter a string: ");

        String inputString = scanner.nextLine();

        int length = inputString.length();

        System.out.println("Length of the string: " + length);

        System.out.println("Choose an operation:");

        System.out.println("1. Convert to Uppercase");

        System.out.println("2. Convert to Lowercase");

        int choice = scanner.nextInt();

        switch (choice) {

            case 1:

                System.out.println("Uppercase: " + inputString.toUpperCase());

                break;

            case 2:

                System.out.println("Lowercase: " + inputString.toLowerCase());

                break;

            default:

                System.out.println("Invalid choice");

        }

    }

}