[Java] 10. 문자열 겹쳐쓰기

1. 문제 설명, 제한 사항, 입출력 예시

2. 아이디어

1. Substring

2. Split

3. 풀이 코드

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

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