Java - 백준 코딩테스트 5622번 [문자열 - 다이얼]

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
 
public class Dial {
 
    public static void main(String[] args) throws IOException {
        // 20210630 - 백준 5622번
        //1은 2초
        //2부터는 +1초씩
        //ABC = 2, DEF = 3, GHI = 4, JKL = 5
        //MNO = 6, PQRS = 7, TUV = 8, WXYZ = 9
        //대문자로 입력 받음
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        String str = br.readLine();
        
        int num = 0;
        for (int i = 0; i < str.length(); i++) {
            switch (str.charAt(i)) {
            case 'A':
            case 'B':
            case 'C':
                num += 3; break;
            case 'D':
            case 'E':
            case 'F':
                num += 4; break;
            case 'G':
            case 'H':
            case 'I':
                num += 5; break;    
            case 'J':
            case 'K':
            case 'L':
                num += 6; break;    
            case 'M':
            case 'N':
            case 'O':
                num += 7; break;    
            case 'P':
            case 'Q':
            case 'R':
            case 'S':
                num += 8; break;    
            case 'T':
            case 'U':
            case 'V':
                num += 9; break;    
            case 'W':
            case 'X':
            case 'Y':
            case 'Z':
                num += 10; break;    
            default: break;
            }
        }
        bw.write(String.valueOf(num));
        bw.flush();
        bw.close();
        br.close();
    }
}