[코테] 문자열 찾기

✔️ 내 생각 -> runtime error

import java.util.*;
  
public class Day1 {
  public static void main(String[] args){
    Scanner input_=new Scanner(System.in);
    Scanner in_= new Scanner(System.in);
    String input=(input_.nextLine()).toLowerCase();
    String in = (in_.nextLine()).toLowerCase();
    String[] arr = input.split("");
    int num =0;
    for(int i=0;i<arr.length;i++){
           if(in.equals(arr[i]))
                 num++;
    }
    System.out.println(num);
   
  }
}

고치기
import java.util.*;

public class Day1 {
public static void main(String[] args){
Scanner input=new Scanner(System.in);
String input=input.next().toLowerCase();
char in = Character.toLowerCase(input_.next().charAt(0));
char[] arr = input.toCharArray();
int num =0;
for(int i=0;i<arr.length;i++){
if(in==arr[i])
num++;
}
System.out.println(num);

}
}

✔️ 정답

import java.util.*;
class Main{
	public int solution(String str, char t) {
		int answer =0;
		str=str.toLowerCase();
		t=Character.toLowerCase(t);
		/*for(int i=0;i<str.length();i++)
			if(str.charAt(i)==t) answer++;*/
		
		for(char x: str.toCharArray())
			if(x==t) answer++;
		
		return answer;
		
	}
	public static void main(String[] args) {
		Main T = new Main();
		Scanner kb = new Scanner(System.in);
		String input = kb.next();
		char in = kb.next().charAt(0);
		System.out.println(Main.solution(input,in));
		
		
	}
	
}

중요 포인트

Scanner kb = new Scanner(System.in);
String input = kb.next();
char in = kb.next().charAt(0);