[SWEA] [JAVA] [Difficulty 2] [1928] Base64 Decoder

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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Base64;

public class Solution {
		
    public static void main(String[] args) throws Exception{
    		
    		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    		int T =  Integer.parseInt(br.readLine()); // 테스트 케이스
    		ArrayList<String> arr = new ArrayList<>();
    		
    		for(int i=0; i<T; i++) {   			
    			String N = br.readLine();  			
    			String decoded = new String(Base64.getDecoder().decode(N));
    			arr.add(decoded);
    		}
    				
    		for(int i=1; i<=T; i++) {
    			System.out.println("#" + i + " " + arr.get(i-1));
    		} 		
    }
    		
}

• Base64 라이브러리 사용
• new String(Base64.getDecoder().decode(N));