Optional์„ ํŒŒ๋ผ๋ฏธํ„ฐ๋กœ ์ „๋‹ฌํ•˜์ง€ ๋ง์ž

์ž๋ฐ” ํ”„๋กœ๊ทธ๋ž˜๋ฐ์„ ํ•˜๋‹ค๋ณด๋ฉด Optional์„ ํŒŒ๋ผ๋ฏธํ„ฐ๋กœ ์ „๋‹ฌํ–ˆ์„ ๋•Œ ์ปดํŒŒ์ผ๋Ÿฌ๊ฐ€ ๊ฒฝ๊ณ (๋…ธ๋ž€์ค„)๋ฅผ ํ‘œ์‹œํ•ฉ๋‹ˆ๋‹ค. (IntelliJ์—์„œ๋Š” ํ‘œ์‹œํ•ด์ฃผ๋Š”๋ฐ ๋‹ค๋ฅธ IDE๋Š” ์–ด๋–ค์ง€ ์ž˜ ๋ชจ๋ฅด๊ฒ ๋„ค์š”) ๊ฒฝ๊ณ ๋ฅผ ํ™•์ธํ•˜๊ธฐ ์œ„ํ•ด ๊ฐ„๋‹จํ•œ ์ฝ”๋“œ๋ฅผ ์ž‘์„ฑํ•ด๋ณด๋ฉด, public void foo(String nullable) { bar(Optional.of(nullable)); } private void bar(Optional s) { // do something } 'Optional' used as type for parameter 's' ๋ฐ”๋กœ ์ด๋Ÿฐ ๋‚ด์šฉ์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ๊ทธ๋ ‡๋‹ค๋ฉด ์™œ Optional์„ ํŒŒ๋ผ๋ฏธํ„ฐ๋กœ ์ „๋‹ฌํ•˜๋ฉด ์•ˆ ๋˜๋Š” ๊ฒƒ์ผ๊นŒ์š”? ๊ฒฐ๋ก ๋ถ€ํ„ฐ ๋ง์”€๋“œ๋ฆฌ๋ฉด ์žฅ์ ๋ณด๋‹ค ๋‹จ์ ์ด ๋งŽ๊ธฐ ๋•Œ๋ฌธ์ž…๋‹ˆ๋‹ค. ๋จผ์ € ์žฅ์ ์œผ๋กœ๋Š” ์ „๋‹ฌํ•  ๋‹น์‹œ์— ๋ณ„ ์ƒ๊ฐ ์—†..

Java 2023. 2. 3. 04:38
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