Build a String with one thousand 'A' Characters

Question

I have a simple question regarding optimization. Let's say I have a function that should return a String with one thousand 'A' characters (the number is arbitrary and might be parametrized later). What would be the best way to go around doing so?

StringBuilder sb = new StringBuilder();
for(int i=0; i<1000; i++)
   sb.append('A');
return sb.toString();

I've come up with this solution utilizing StringBuilder but I feel there should be a better solution, a memcpy of sorts.

Thanks!

Answer 1

Arrays::fill

Demo:

import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        char[] arr = new char[1000];
        Arrays.fill(arr, 'A');
        String str = new String(arr);
        System.out.println(str);
    }
}

Alternatively, String::repeat

Demo:

public class Main {
    public static void main(String[] args) {
        String str = "A".repeat(1000);
        System.out.println(str);
    }
}