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\ud654\uba74\uc73c\ub85c \ud6a8\uc728\uc801\uc73c\ub85c \uc774\ub3d9\ud560 \uc218 \uc788\ub3c4\ub85d \ub3d5\ub294 \uc911\uc694\ud55c UI \ucef4\ud3ec\ub10c\ud2b8\uc785\ub2c8\ub2e4. \uc774 \uac15\uc88c\uc5d0\uc11c\ub294 \uc790\ubc14\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uc758 \ub0b4\ube44\uac8c\uc774\uc158 \ubdf0\ub97c \uad6c\uc131\ud558\ub294 \ubc29\ubc95\uc744 \uc790\uc138\ud788 \uc124\uba85\ud558\uaca0\uc2b5\ub2c8\ub2e4. \ub610\ud55c, \uc2e4\uc81c \uc608\uc81c\uc640 \ud568\uaed8 \ub4dc\ub85c\uc5b4 \ub808\uc774\uc544\uc6c3\uc744 \uc124\uc815\ud558\uc5ec \uc0ac\uc6a9\uc790 \uce5c\ud654\uc801\uc778 \ub124\ube44\uac8c\uc774\uc158\uc744 \uad6c\ud604\ud558\ub294\u2026","rel":"","context":""\uc790\ubc14 \uc548\ub4dc\ub85c\uc774\ub4dc\uc571 \uac1c\ubc1c"\uc5d0\uc11c","block_context":{"text":"\uc790\ubc14 \uc548\ub4dc\ub85c\uc774\ub4dc\uc571 \uac1c\ubc1c","link":"https:\/\/atmokpo.com\/w\/category\/%ec%9e%90%eb%b0%94-%ec%95%88%eb%93%9c%eb%a1%9c%ec%9d%b4%eb%93%9c%ec%95%b1-%ea%b0%9c%eb%b0%9c\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":43380,"url":"https:\/\/atmokpo.com\/w\/43380\/","url_meta":{"origin":30685,"position":3},"title":"[Electron] 018. Electron \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc131\ub2a5 \ucd5c\uc801\ud654, \uba54\ubaa8\ub9ac \uad00\ub9ac\uc640 \ub9ac\uc18c\uc2a4 \ucd5c\uc801\ud654","author":"root","date":"2024\ub144 11\uc6d4 26\uc77c","format":false,"excerpt":"Electron\uc740 \uc6f9 \uae30\uc220\uc744 \uc774\uc6a9\ud574 \ub370\uc2a4\ud06c\ud0d1 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uac1c\ubc1c\ud560 \uc218 \uc788\ub294 \ud504\ub808\uc784\uc6cc\ud06c\ub85c, \ub9ce\uc740 \uac1c\ubc1c\uc790\ub4e4\uc774 \uc0ac\ub791\ud558\ub294 \ub3c4\uad6c\uc785\ub2c8\ub2e4. \uadf8\ub7ec\ub098 Electron \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc740 \ub300\uccb4\ub85c \uba54\ubaa8\ub9ac \uc0ac\uc6a9\ub7c9\uc774 \ub9ce\uace0 \uc131\ub2a5\uc774 \uc800\ud558\ub420 \uc218 \uc788\ub294 \uac00\ub2a5\uc131\uc774 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \uae00\uc5d0\uc11c\ub294 Electron \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \uc131\ub2a5 \ucd5c\uc801\ud654, \uba54\ubaa8\ub9ac \uad00\ub9ac \ubc0f \ub9ac\uc18c\uc2a4 \ucd5c\uc801\ud654\uc5d0 \ub300\ud574 \ub2e4\ub8e8\uaca0\uc2b5\ub2c8\ub2e4. 1. Electron \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \uc131\ub2a5 \ubb38\uc81c \uc774\ud574\ud558\uae30 Electron \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc774 \uc77c\ubc18\uc801\uc73c\ub85c \uacaa\ub294\u2026","rel":"","context":""electron"\uc5d0\uc11c","block_context":{"text":"electron","link":"https:\/\/atmokpo.com\/w\/category\/electron\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":30543,"url":"https:\/\/atmokpo.com\/w\/30543\/","url_meta":{"origin":30685,"position":4},"title":"\ucf54\ud2c0\ub9b0 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uac1c\ubc1c \uac15\uc88c, \ud130\uce58\uc640 \ud0a4 \uc774\ubca4\ud2b8","author":"root","date":"2024\ub144 10\uc6d4 28\uc77c","format":false,"excerpt":"\uc791\uc131\uc790: \uc870\uad11\ud615 \ub0a0\uc9dc: [\ub0a0\uc9dc] \uc11c\ub860 \uc548\ub4dc\ub85c\uc774\ub4dc \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uac1c\ubc1c\uc5d0\uc11c \uc0ac\uc6a9\uc790 \uc778\ud130\ud398\uc774\uc2a4(UI)\ub294 \uc911\uc694\ud55c \uc5ed\ud560\uc744 \ud569\ub2c8\ub2e4. \uc0ac\uc6a9\uc790\uac00 \uc571\uacfc \uc0c1\ud638\uc791\uc6a9\ud558\uae30 \uc704\ud574\uc11c\ub294 \ub2e4\uc591\ud55c \uc774\ubca4\ud2b8\ub97c \ucc98\ub9ac\ud560 \uc218 \uc788\uc5b4\uc57c \ud569\ub2c8\ub2e4. \uc774 \uac15\uc88c\uc5d0\uc11c\ub294 \ucf54\ud2c0\ub9b0\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uc5d0\uc11c \ud130\uce58 \uc774\ubca4\ud2b8\uc640 \ud0a4 \uc774\ubca4\ud2b8\ub97c \ucc98\ub9ac\ud558\ub294 \ubc29\ubc95\uc744 \uc2ec\ub3c4 \uc788\uac8c \ub2e4\ub8f0 \uac83\uc785\ub2c8\ub2e4. \ud2b9\ud788 \ud130\uce58 \uc774\ubca4\ud2b8\ub294 \ud654\uba74\uc744 \ud130\uce58\ud558\ub294 \ud589\ub3d9\uacfc \uad00\ub828\ub41c \uac83\uc774\uba70, \ud0a4 \uc774\ubca4\ud2b8\ub294 \ubb3c\ub9ac\uc801\u2026","rel":"","context":""\ucf54\ud2c0\ub9b0 \uc548\ub4dc\ub85c\uc774\ub4dc\uc571 \uac1c\ubc1c"\uc5d0\uc11c","block_context":{"text":"\ucf54\ud2c0\ub9b0 \uc548\ub4dc\ub85c\uc774\ub4dc\uc571 \uac1c\ubc1c","link":"https:\/\/atmokpo.com\/w\/category\/%ec%bd%94%ed%8b%80%eb%a6%b0-%ec%95%88%eb%93%9c%eb%a1%9c%ec%9d%b4%eb%93%9c%ec%95%b1-%ea%b0%9c%eb%b0%9c\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":30545,"url":"https:\/\/atmokpo.com\/w\/30545\/","url_meta":{"origin":30685,"position":5},"title":"\ucf54\ud2c0\ub9b0 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uac1c\ubc1c \uac15\uc88c, \ud2c0\ub9b0 \uac1d\uccb4\uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d","author":"root","date":"2024\ub144 10\uc6d4 28\uc77c","format":false,"excerpt":"\ucd5c\uadfc \ubaa8\ubc14\uc77c \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uac1c\ubc1c\uc774 \ud65c\uc131\ud654\ub418\uace0, \uadf8 \uc911\uc5d0\uc11c\ub3c4 \uc548\ub4dc\ub85c\uc774\ub4dc \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uac1c\ubc1c\uc774 \uc8fc\ubaa9\ubc1b\uace0 \uc788\uc2b5\ub2c8\ub2e4. \ucf54\ud2c0\ub9b0(Kotlin)\uc740 \uad6c\uae00\uc774 \uacf5\uc2dd\uc801\uc73c\ub85c \uc9c0\uc6d0\ud558\ub294 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c \uc5b8\uc5b4\ub85c, \uac04\uacb0\ud558\uace0 \uc548\uc804\ud55c \ubb38\ubc95\uc73c\ub85c \ub9ce\uc740 \uac1c\ubc1c\uc790\ub4e4\uc5d0\uac8c \uc0ac\ub791\ubc1b\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ubc88 \uac15\uc88c\uc5d0\uc11c\ub294 \uac1d\uccb4\uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d(OOP)\uc758 \uae30\ubcf8 \uac1c\ub150\uc744 \uc54c\uc544\ubcf4\uace0, \uc774\ub97c \ucf54\ud2c0\ub9b0\uc744 \ud65c\uc6a9\ud55c \uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc5d0 \uc5b4\ub5bb\uac8c \uc801\uc6a9\ud560 \uc218 \uc788\ub294\uc9c0 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \ud2b9\ud788 '\ud2c0\ub9b0 \uac1d\uccb4\uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d'\uc774\ub77c\ub294 \uc8fc\uc81c\ub97c\u2026","rel":"","context":""\ucf54\ud2c0\ub9b0 \uc548\ub4dc\ub85c\uc774\ub4dc\uc571 \uac1c\ubc1c"\uc5d0\uc11c","block_context":{"text":"\ucf54\ud2c0\ub9b0 \uc548\ub4dc\ub85c\uc774\ub4dc\uc571 \uac1c\ubc1c","link":"https:\/\/atmokpo.com\/w\/category\/%ec%bd%94%ed%8b%80%eb%a6%b0-%ec%95%88%eb%93%9c%eb%a1%9c%ec%9d%b4%eb%93%9c%ec%95%b1-%ea%b0%9c%eb%b0%9c\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/atmokpo.com\/w\/wp-json\/wp\/v2\/posts\/30685","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/atmokpo.com\/w\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/atmokpo.com\/w\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/atmokpo.com\/w\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/atmokpo.com\/w\/wp-json\/wp\/v2\/comments?post=30685"}],"version-history":[{"count":1,"href":"https:\/\/atmokpo.com\/w\/wp-json\/wp\/v2\/posts\/30685\/revisions"}],"predecessor-version":[{"id":30686,"href":"https:\/\/atmokpo.com\/w\/wp-json\/wp\/v2\/posts\/30685\/revisions\/30686"}],"wp:attachment":[{"href":"https:\/\/atmokpo.com\/w\/wp-json\/wp\/v2\/media?parent=30685"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/atmokpo.com\/w\/wp-json\/wp\/v2\/categories?post=30685"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/atmokpo.com\/w\/wp-json\/wp\/v2\/tags?post=30685"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":30685,"date":"2024-10-28T04:01:33","date_gmt":"2024-10-28T04:01:33","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=30685"},"modified":"2024-11-26T06:47:43","modified_gmt":"2024-11-26T06:47:43","slug":"%ec%9e%90%eb%b0%94-%ec%95%88%eb%93%9c%eb%a1%9c%ec%9d%b4%eb%93%9c-%ec%95%b1%ea%b0%9c%eb%b0%9c-%ea%b0%95%ec%a2%8c-%ec%9e%90%eb%b0%94-%eb%84%90-%ec%95%88%ec%a0%84%ec%84%b1","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/30685\/","title":{"rendered":"\uc790\ubc14 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uac1c\ubc1c \uac15\uc88c, \uc790\ubc14, \ub110 \uc548\uc804\uc131"},"content":{"rendered":"

<\/p>\n

\uc548\ub155\ud558\uc138\uc694! \ubcf8 \uac15\uc88c\uc5d0\uc11c\ub294 \uc790\ubc14\ub97c \ud65c\uc6a9\ud55c \uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc5d0 \ub300\ud574 \ub2e4\ub8f0 \uac83\uc785\ub2c8\ub2e4. \uc790\ubc14\ub294 \uc624\ub7ab\ub3d9\uc548 \uc548\ub4dc\ub85c\uc774\ub4dc \uac1c\ubc1c\uc758 \uae30\ubcf8 \uc5b8\uc5b4\ub85c \uc790\ub9ac \uc7a1\uace0 \uc788\uc73c\uba70, \uadf8 \uc548\uc815\uc131\uacfc \ud6a8\uc728\uc131 \ub355\ubd84\uc5d0 \ub9ce\uc740 \uac1c\ubc1c\uc790\ub4e4\uc774 \uc120\ud638\ud558\ub294 \uc120\ud0dd\uc785\ub2c8\ub2e4. \ud2b9\ud788 ‘\ub110 \uc548\uc804\uc131’\uc740 \uc790\ubc14\uc5d0\uc11c \ub9e4\uc6b0 \uc911\uc694\ud55c \uc8fc\uc81c \uc911 \ud558\ub098\ub85c, \uc571\uc758 \uc548\uc815\uc131\uacfc \uc131\ub2a5\uc5d0 \ud070 \uc601\ud5a5\uc744 \ubbf8\uce60 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

1. \ub110 \uc548\uc804\uc131\uc774\ub780?<\/h2>\n
\ub110 \uc548\uc804\uc131\uc774\ub780, \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc5d0\uc11c \ub110(null) \uac12\uc73c\ub85c \uc778\ud574 \ubc1c\uc0dd\ud560 \uc218 \uc788\ub294 \uc624\ub958\ub97c \ubc29\uc9c0\ud558\ub294 \uae30\uc220\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4. \uc790\ubc14\uc5d0\uc11c \ub110 \uac12\uc740 ‘\uac12 \uc5c6\uc74c’\uc744 \ub098\ud0c0\ub0b4\ub294 \ud2b9\uc218\ud55c \uac12\uc785\ub2c8\ub2e4. \ub110 \ucc38\uc870\ub97c \ud1b5\ud574 \uac1d\uccb4\uc5d0 \uc811\uadfc\ud560 \ub54c \uc720\ud6a8\ud558\uc9c0 \uc54a\uc740 \ucc38\uc870\ub97c \uc2dc\ub3c4\ud558\uba74 `NullPointerException<\/code>\uc774 \ubc1c\uc0dd\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub294 \uc571\uc758 \ube44\uc815\uc0c1 \uc885\ub8cc\ub97c \uc720\ubc1c\ud558\uac8c \ub418\uba70, \uc0ac\uc6a9\uc790 \uacbd\ud5d8\uc5d0 \ud070 \uc601\ud5a5\uc744 \ubbf8\uce58\ub294 \uc5d0\ub7ec\uc785\ub2c8\ub2e4.<\/p>\n`

1.1 NullPointerException\uc758 \uc6d0\uc778<\/h3>\nNullPointerException<\/code>\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uc0c1\ud669\uc5d0\uc11c \ubc1c\uc0dd\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n
\n\ub110 \uac1d\uccb4\uc5d0 \uba54\uc11c\ub4dc\ub97c \ud638\ucd9c\ud560 \ub54c<\/li>\n
\ub110 \uac1d\uccb4\uc758 \ud544\ub4dc\uc5d0 \uc811\uadfc\ud560 \ub54c<\/li>\n
\ub110 \ubc30\uc5f4\uc5d0 \uc811\uadfc\ud560 \ub54c<\/li>\n<\/ul>\n\ub530\ub77c\uc11c, \uac1d\uccb4\ub97c \uc0ac\uc6a9\ud560 \ub54c \ubc18\ub4dc\uc2dc \ub110 \uc5ec\ubd80\ub97c \ud655\uc778\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n
2. \uc790\ubc14\uc5d0\uc11c\uc758 \ub110 \uc548\uc804\uc131<\/h2>\n\uc790\ubc14\ub294 \uae30\ubcf8\uc801\uc73c\ub85c \ub110 \uc548\uc804\uc131\uc744 \ubcf4\uc7a5\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \uadf8\ub7ec\ub098 \uac1c\ubc1c\uc790\uac00 \ub110 \uccb4\ud06c\ub97c \ucf54\ub529\ud558\uc5ec \uc774\ub7ec\ud55c \ubb38\uc81c\ub97c \uc608\ubc29\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
2.1 \ub110 \uccb4\ud06c\uc758 \uc911\uc694\uc131<\/h3>\n\ub110 \uccb4\ud06c\ub97c \ud1b5\ud574 \uac1d\uccb4\uac00 \ub110\uc778\uc9c0 \ud655\uc778\ud55c \ud6c4\uc5d0 \uc811\uadfc\ud558\ub294 \ubc29\uc2dd\uc73c\ub85c, \ud504\ub85c\uadf8\ub798\uba38\ub294 \ubcf4\ub2e4 \uc548\uc804\ud55c \ucf54\ub4dc\ub97c \uc791\uc131\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \ub2e4\uc74c\uacfc \uac19\uc740 \ubc29\uc2dd\uc73c\ub85c \ub110 \uccb4\ud06c\ub97c \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n
if (object != null) {\n        object.doSomething();\n    } else {\n        \/\/ \uc608\uc678 \ucc98\ub9ac \ud639\uc740 \ub300\uc548 \ub85c\uc9c1\n    }<\/code><\/pre>\n2.2 Optional \ud074\ub798\uc2a4 \uc0ac\uc6a9<\/h3>\n\uc790\ubc14 8\ubd80\ud130 \ub3c4\uc785\ub41c Optional<\/code> \ud074\ub798\uc2a4\ub294 \ub110 \uc548\uc804\uc131\uc744 \uad6c\ud604\ud558\uae30 \uc704\ud574 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \uc720\uc6a9\ud55c \ub3c4\uad6c\uc785\ub2c8\ub2e4. Optional<\/code> \ud074\ub798\uc2a4\ub294 \uac1d\uccb4\uc758 \uc874\uc7ac \uc5ec\ubd80\ub97c \ub098\ud0c0\ub0b4\ub294 \ucee8\ud14c\uc774\ub108\ub85c, \ub110 \uac12\uc744 \ub300\uc2e0\ud558\uc5ec \uc0ac\uc6a9\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\uc608\uc81c \ucf54\ub4dc:<\/h4>\nimport java.util.Optional;\n\n    public class OptionalExample {\n        public static void main(String[] args) {\n            Optional optionalString = Optional.ofNullable(getString());\n\n            optionalString.ifPresent(s -> System.out.println(\"\ubb38\uc790\uc5f4\uc758 \uae38\uc774: \" + s.length()));\n        }\n\n        public static String getString() {\n            \/\/ null \uc788\uac8c \ubc18\ud658\n            return null;\n        }\n    }<\/string><\/code><\/pre>\n\uc774 \uc608\uc81c\uc5d0\uc11c\ub294 getString()<\/code> \uba54\uc11c\ub4dc\uac00 \ub110 \uac12\uc744 \ubc18\ud658\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uadf8\ub7ec\ub098 Optional<\/code>\uc744 \uc0ac\uc6a9\ud568\uc73c\ub85c\uc368 \ub110 \uac12\uc744 \uc548\uc804\ud558\uac8c \ucc98\ub9ac\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
3. \uc548\ub4dc\ub85c\uc774\ub4dc\uc5d0\uc11c\uc758 \ub110 \uc548\uc804\uc131<\/h2>\n\uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc5d0\uc11c\ub3c4 \ub110 \uc548\uc804\uc131\uc740 \uc911\uc694\ud55c \uc694\uc18c\uc785\ub2c8\ub2e4. \uc0ac\uc6a9\uc790 \uc785\ub825\uc774\ub098 \uc678\ubd80 \ub370\uc774\ud130 \ub4f1\uc5d0\uc11c \ub110 \uac12\uc774 \ubc1c\uc0dd\ud560 \uc218 \uc788\uae30 \ub54c\ubb38\uc5d0, \uc774\ub97c \uc801\uc808\ud788 \ucc98\ub9ac\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n
3.1 Java\uc640 Kotlin\uc758 \ube44\uad50<\/h3>\nKotlin\uc740 \ub110 \uc548\uc804\uc131\uc774 \ub0b4\uc7a5\ub41c \uc5b8\uc5b4\ub85c, \uc790\ubc14\uc640\uc758 \ud638\ud658\uc131\uc744 \uc720\uc9c0\ud558\uae30 \uc704\ud574 \uc790\ubc14\uc640 \ud568\uaed8 \uc790\uc8fc \uc0ac\uc6a9\ub429\ub2c8\ub2e4. Kotlin\uc740 \ub110\uc774 \uac00\ub2a5\ud55c \ud0c0\uc785\uacfc \ubd88\uac00\ub2a5\ud55c \ud0c0\uc785\uc744 \uad6c\ubd84\ud558\uba70, \uc774\ub97c \ud1b5\ud574 \ub354 \uc548\uc804\ud55c \ucf54\ub4dc \uc791\uc131\uc774 \uac00\ub2a5\ud569\ub2c8\ub2e4. Kotlin\uc5d0\uc11c \ubcc0\uc218\ub97c \uc120\uc5b8\ud560 \ub54c ?\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub110 \uac00\ub2a5\uc131\uc744 \ud45c\uc2dc\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\uc608\uc81c \ucf54\ub4dc (Kotlin):<\/h4>\nfun main() {\n        val name: String? = null\n        println(name?.length ?: \"\ub110\uc785\ub2c8\ub2e4.\")\n    }<\/code><\/pre>\n4. \uc548\ub4dc\ub85c\uc774\ub4dc\uc5d0\uc11c \uc790\ubc14\uc640 \ub110 \uc548\uc804\uc131\uc744 \ud1b5\ud55c \uc571 \uac1c\ubc1c<\/h2>\n\uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc5d0\uc11c\ub294 \uc0ac\uc6a9\uc790 \uc778\ud130\ud398\uc774\uc2a4(UI) \uc694\uc18c \ubc0f \ub2e4\uc591\ud55c \ub370\uc774\ud130 \uc18c\uc2a4\uc640\uc758 \uc0c1\ud638\uc791\uc6a9 \uc2dc \ub110 \uc548\uc804\uc131\uc744 \uace0\ub824\ud574\uc57c \ud569\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \ub110 \uc548\uc804\uc131\uc744 \uace0\ub824\ud55c \uc608\uc81c\uc785\ub2c8\ub2e4.<\/p>\n
4.1 \ub110 \uccb4\ud06c\ub97c \ud1b5\ud55c \ubc84\ud2bc \ud074\ub9ad \uc774\ubca4\ud2b8 \ucc98\ub9ac<\/h3>\nButton myButton = findViewById(R.id.my_button);\n    \n    if (myButton != null) {\n        myButton.setOnClickListener(view -> {\n            \/\/ \ubc84\ud2bc \ud074\ub9ad \uc2dc \ud589\ub3d9\n        });\n    }<\/code><\/pre>\n4.2 \uc0ac\uc6a9\uc790 \uc785\ub825 \ucc98\ub9ac<\/h3>\n\uc0ac\uc6a9\uc790\ub85c\ubd80\ud130 \uc785\ub825\uc744 \ubc1b\uc744 \ub54c \ub110 \uac12\uc744 \ucc98\ub9ac\ud558\ub294 \ubc29\ubc95\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n
EditText inputText = findViewById(R.id.input_text);\n    String inputValue = inputText.getText().toString();\n    \n    if (!inputValue.isEmpty()) {\n        \/\/ \uc720\ud6a8\ud55c \uc785\ub825\uac12 \ucc98\ub9ac\n    }<\/code><\/pre>\n5. \uacb0\ub860<\/h2>\n\uc790\ubc14\uc5d0\uc11c \ub110 \uc548\uc804\uc131\uc740 \uc571\uc758 \uc548\uc815\uc131\uacfc \uc0ac\uc6a9\uc790 \uacbd\ud5d8\uc744 \uc88c\uc6b0\ud558\ub294 \uc911\uc694\ud55c \uc694\uc18c\uc785\ub2c8\ub2e4. \ub110 \uccb4\ud06c\uc640 Optional<\/code> \ud074\ub798\uc2a4 \uc0ac\uc6a9, \uadf8\ub9ac\uace0 Kotlin \ub4f1 \uc0c8\ub85c\uc6b4 \uc5b8\uc5b4\uc758 \ud65c\uc6a9\uc744 \ud1b5\ud574 \ub110\ub85c \uc778\ud55c \ubb38\uc81c\ub97c \uc904\uc774\uace0 \ubcf4\ub2e4 \uc548\uc804\ud55c \uc571\uc744 \uac1c\ubc1c\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc55e\uc73c\ub85c\uc758 \uc571 \uac1c\ubc1c\uc5d0\uc11c \uc774 \uc6d0\uce59\ub4e4\uc744 \uaf2d \uae30\uc5b5\ud574\uc8fc\uc2dc\uae30 \ubc14\ub78d\ub2c8\ub2e4!<\/p>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"
\uc548\ub155\ud558\uc138\uc694! \ubcf8 \uac15\uc88c\uc5d0\uc11c\ub294 \uc790\ubc14\ub97c \ud65c\uc6a9\ud55c \uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc5d0 \ub300\ud574 \ub2e4\ub8f0 \uac83\uc785\ub2c8\ub2e4. \uc790\ubc14\ub294 \uc624\ub7ab\ub3d9\uc548 \uc548\ub4dc\ub85c\uc774\ub4dc \uac1c\ubc1c\uc758 \uae30\ubcf8 \uc5b8\uc5b4\ub85c \uc790\ub9ac \uc7a1\uace0 \uc788\uc73c\uba70, \uadf8 \uc548\uc815\uc131\uacfc \ud6a8\uc728\uc131 \ub355\ubd84\uc5d0 \ub9ce\uc740 \uac1c\ubc1c\uc790\ub4e4\uc774 \uc120\ud638\ud558\ub294 \uc120\ud0dd\uc785\ub2c8\ub2e4. \ud2b9\ud788 ‘\ub110 \uc548\uc804\uc131’\uc740 \uc790\ubc14\uc5d0\uc11c \ub9e4\uc6b0 \uc911\uc694\ud55c \uc8fc\uc81c \uc911 \ud558\ub098\ub85c, \uc571\uc758 \uc548\uc815\uc131\uacfc \uc131\ub2a5\uc5d0 \ud070 \uc601\ud5a5\uc744 \ubbf8\uce60 \uc218 \uc788\uc2b5\ub2c8\ub2e4. 1. \ub110 \uc548\uc804\uc131\uc774\ub780? \ub110 \uc548\uc804\uc131\uc774\ub780, \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc5d0\uc11c \ub110(null) \uac12\uc73c\ub85c \uc778\ud574 … \ub354 \ubcf4\uae30 “\uc790\ubc14 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uac1c\ubc1c \uac15\uc88c, \uc790\ubc14, \ub110 \uc548\uc804\uc131”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[36],"tags":[],"class_list":["post-30685","post","type-post","status-publish","format-standard","hentry","category-36"],"yoast_head":"\n\uc790\ubc14 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uac1c\ubc1c \uac15\uc88c, \uc790\ubc14, \ub110 \uc548\uc804\uc131 - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atmokpo.com\/w\/30685\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\uc790\ubc14 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uac1c\ubc1c \uac15\uc88c, \uc790\ubc14, \ub110 \uc548\uc804\uc131 - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"og:description\" content=\"\uc548\ub155\ud558\uc138\uc694! \ubcf8 \uac15\uc88c\uc5d0\uc11c\ub294 \uc790\ubc14\ub97c \ud65c\uc6a9\ud55c \uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc5d0 \ub300\ud574 \ub2e4\ub8f0 \uac83\uc785\ub2c8\ub2e4. \uc790\ubc14\ub294 \uc624\ub7ab\ub3d9\uc548 \uc548\ub4dc\ub85c\uc774\ub4dc \uac1c\ubc1c\uc758 \uae30\ubcf8 \uc5b8\uc5b4\ub85c \uc790\ub9ac \uc7a1\uace0 \uc788\uc73c\uba70, \uadf8 \uc548\uc815\uc131\uacfc \ud6a8\uc728\uc131 \ub355\ubd84\uc5d0 \ub9ce\uc740 \uac1c\ubc1c\uc790\ub4e4\uc774 \uc120\ud638\ud558\ub294 \uc120\ud0dd\uc785\ub2c8\ub2e4. \ud2b9\ud788 ‘\ub110 \uc548\uc804\uc131’\uc740 \uc790\ubc14\uc5d0\uc11c \ub9e4\uc6b0 \uc911\uc694\ud55c \uc8fc\uc81c \uc911 \ud558\ub098\ub85c, \uc571\uc758 \uc548\uc815\uc131\uacfc \uc131\ub2a5\uc5d0 \ud070 \uc601\ud5a5\uc744 \ubbf8\uce60 \uc218 \uc788\uc2b5\ub2c8\ub2e4. 1. \ub110 \uc548\uc804\uc131\uc774\ub780? \ub110 \uc548\uc804\uc131\uc774\ub780, \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc5d0\uc11c \ub110(null) \uac12\uc73c\ub85c \uc778\ud574 … \ub354 \ubcf4\uae30 "\uc790\ubc14 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uac1c\ubc1c \uac15\uc88c, \uc790\ubc14, \ub110 \uc548\uc804\uc131"\" \/>\n<meta property=\"og:url\" content=\"https:\/\/atmokpo.com\/w\/30685\/\" \/>\n<meta property=\"og:site_name\" content=\"\ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"article:published_time\" content=\"2024-10-28T04:01:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-26T06:47:43+00:00\" \/>\n<meta name=\"author\" content=\"root\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@bebubo4\" \/>\n<meta name=\"twitter:site\" content=\"@bebubo4\" 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