[프로그래머스/Java] 문자열 뒤집기 (StringBuilder)

https://school.programmers.co.kr/learn/courses/30/lessons/181905

프로그래머스

class Solution {
    public String solution(String my_string, int s, int e) {
        String answer = my_string.substring(s,e+1);
        
        StringBuilder sb = new StringBuilder(answer);
        answer = sb.reverse().toString();
        
        answer = my_string.substring(0,s)+answer+my_string.substring(e+1);
        
        return answer;
    }
}