[프로그래머스] Lv.0 문자열 바꿔서 찾기 (String 문자열 변경)

답

◽ 배열

import java.util.ArrayList;
import java.util.List;

class Solution {
    public int solution(String myString, String pat) {
        List<String> strList = new ArrayList<>();

        for (int a = 0; a < myString.length(); a++) {
                String word = String.valueOf(myString.charAt(a));
                String re = word.equals("A") ? "B" : "A";
                strList.add(re);
        }

        String change = String.join("", strList);

        int answer = change.contains(pat) ? 1 : 0;
        return answer;
    }
}

리팩토링

◽ String + String

class Solution {
    public int solution(String myString, String pat) {
        String change = "";

        for (int a = 0; a < myString.length(); a++) {
                String word = String.valueOf(myString.charAt(a));
                String re = word.equals("A") ? "B" : "A";
                change = change + re;
        }

        int answer = change.contains(pat) ? 1 : 0;
        return answer;
    }
}

다른 사람의 풀이

◽ replace()

class Solution {
    public int solution(String myString, String pat) {
        myString = myString.replace("A", "a").replace("B", "A").replace("a", "B");
        return myString.contains(pat) ? 1 : 0;
    }
}

myString = myString.replace("A", "B").replace("B", "A");
➡️ AAAAA

string.replace(old word, new word)

String sentence = "I like bananas.";
String newSentence = sentence.replace("bananas", "apples");
➡️ "I like apples."