Capitalize First

Main.java

import java.util.Scanner;

public class Main {
    public static String capitalizeFirstLetter(String input) {
        StringBuilder result = new StringBuilder();
        boolean capitalizeNext = true;

        for (char c : input.toCharArray()) {
            if (Character.isWhitespace(c)) {
                result.append(c);
                capitalizeNext = true;
            } else {
                if (capitalizeNext) {
                    result.append(Character.toUpperCase(c));
                    capitalizeNext = false;
                } else {
                    result.append(Character.toLowerCase(c));
                }
            }
        }

        return result.toString();
    }

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        String str = input.nextLine();
        String result = capitalizeFirstLetter(str);

        System.out.print(result);

        input.close();
    }
}