在Java中打印与字符串等效的特定于字符的行

Question

To keep it short and concise I'm attempting to write a program that not only turns user input into a title. but also prints out a user generated decorative underline beneath the output. example;

"prompt to get user input"

input: i am a title, *

output:

I Am A Title
* ** * *****

I was thinking of using a method that receives a String and a char and uses that to calculate the number of chars it has to output. I was already able to get the title to output in capitals thanks to a post here. Now it's just the characters. Even if it's just ways to think about the problem. Any help would be appreciated.

Answer 1

public static void printUnderline(String s, char c){
    char[] arr =s.toCharArray();
    for(int i=0;i<arr.length;i++)
        if(arr[i] == ' ')
            System.out.print(' ');
        else
            System.out.print(c);
}

Answer 2

        String str = "i am a title";
        String aux = "";
        String[]titles = str.split(" ");

        for(int i=0; i<titles.length;i++){
            aux += titles[i].replaceFirst(titles[i].charAt(0)+"", Character.toUpperCase(titles[i].charAt(0))+"") + " ";
        }

        System.out.println(aux);
        if(str.contains(" ")){
            aux = str;
            aux = aux.replaceAll("[A-Za-z]",  "*");

            System.out.println(aux);

        }else{
            System.out.println(false);
        }