[알고리즘문제풀기] ad 제거하기

문제

내가 작성한 정답

ArrayList - toArray

import java.util.*;

class Solution {
    public String[] solution(String[] strArr) {
        ArrayList<String> answer = new ArrayList<>();
        for(String s: strArr){
            if(s.contains("ad")) continue;
            else answer.add(s);
        }
        // 반환형태 알려주기
        return answer.toArray(String[]::new);
        return answer.toArray(new String[0]);
        return answer.toArray(new String[answer.size()];
    }
}

ArrayList - Array

import java.util.*;

class Solution {
    public String[] solution(String[] strArr) {
        ArrayList<String> answer = new ArrayList<>();
        for(String s: strArr){
            if(s.contains("ad")) continue;
            else answer.add(s);
        }
        String[] answer = new String[answer1.size()];
        for(int i=0; i<answer.length;i++){
            answer[i] = answer1.get(i);
        }
        return answer;
    }
}

Stream

import java.util.*;

class Solution {
    public String[] solution(String[] strArr) {
        return Arrays.stream(strArr)
                .filter(s->!s.contains("ad"))
                .toArray(String[]::new);
    }
}