We have a bag, which has some numbers inside it. This bag has unique elements, which means every number appears once only. If we want to add 9 in a bag, then it will be not inserted as the bag already ...
map.put("C", 103); //중복된 key가 들어갈때는 이전 키,값을 지금의 것으로 업데이트 System.out.println(map); System.out.println(map.get("A ...