polymorphism

๋‹คํ˜•์„ฑ - 1๋‹คํ˜•์„ฑ - 2
Previous์ž๋ฐ” ๋ฉ”๋ชจ๋ฆฌ ๊ตฌ์กฐ์™€ staticNext๋‹คํ˜•์„ฑ - 1

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