[algo] eof

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st;
        StringBuilder sb = new StringBuilder();
        String str;

        while((str = br.readLine()) != null){
            st = new StringTokenizer(str);
        }
        
        while((str = br.readLine()) != null){}

- eof 처리 시 방법

while((str = br.readLine()) != null){}