[Java] 프로그래머스 : 문자열 겹쳐쓰기

https://school.programmers.co.kr/learn/courses/30/lessons/181943

프로그래머스

 

 

class Solution {
    public String solution(String my_string, String overwrite_string, int s) {
        String answer = "";
        
        answer += my_string.substring(0,s);
        answer += overwrite_string;
        answer += my_string.substring(answer.length(), my_string.length());
        
        return answer;
    }
}