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value๋Š” private์ธ๋ฐ a.CallFriend() ํ•˜๋ฉด friend.value๋ฅผ ์ฝ์„ ์ˆ˜ ์žˆ์Œ.

์ด๊ฑฐ ๋Œ๋ฆฌ๋ฉด ์ฝ˜์†”์— 20์ด ์ฐํž˜.


์–ด๋–ป๊ฒŒ friend.value์— ์ ‘๊ทผ์ด ๊ฐ€๋Šฅํ•œ ๊ฑฐ์ž„? ๋‚ด๊ฐ€ private๋ฅผ ์ž˜๋ชป ์ดํ•ดํ•˜๊ณ  ์žˆ์—ˆ๋‚˜?