https : / / brunch . co . kr / @ cleancode / 11 자바 개발자 를 위한 도서 추천 Thinking in Javahttp : / / www . amazon . com / Thinking - Java - 4 th - Bruce - Eckel / dp / 0131872486 / ref = sr _ 1 _ 1 ? s = booksbrunch . co . kr