{"id":669906,"date":"2025-12-29T12:25:31","date_gmt":"2025-12-29T11:25:31","guid":{"rendered":"https:\/\/blog.jetbrains.com\/?post_type=kotlin&#038;p=669906"},"modified":"2026-01-13T10:46:36","modified_gmt":"2026-01-13T09:46:36","slug":"getting-started-with-kotlin-for-java-developers","status":"publish","type":"kotlin","link":"https:\/\/blog.jetbrains.com\/ko\/kotlin\/2025\/12\/getting-started-with-kotlin-for-java-developers\/","title":{"rendered":"Java \uac1c\ubc1c\uc790\ub97c \uc704\ud55c Kotlin \uc2dc\uc791\ud558\uae30"},"content":{"rendered":"<p><em>\uc120\uc784 \uc18c\ud504\ud2b8\uc6e8\uc5b4 \uc5d4\uc9c0\ub2c8\uc5b4\uc774\uc790 JetBrains \uacf5\uc778 Kotlin \ud2b8\ub808\uc774\ub108\ub85c \ud65c\ub3d9 \uc911\uc778 <a href=\"https:\/\/www.linkedin.com\/in\/urs-peter-70a2882\/\" target=\"_blank\" rel=\"noreferrer noopener\" data-type=\"link\" data-id=\"https:\/\/bit.ly\/urs-peter-linked-in\">Urs Peter<\/a>\uac00 \uae30\uace0\ud55c \uae00\uc785\ub2c8\ub2e4. Urs\ub294 \ub354 \uccb4\uacc4\uc801\uc778 \ubc29\ubc95\uc73c\ub85c Kotlin \uc5ed\ub7c9\uc744 \ub192\uc774\uace0 \uc2f6\uc740 \ub3c5\uc790\ub97c \ub300\uc0c1\uc73c\ub85c Xebia Academy\uc5d0\uc11c <a href=\"https:\/\/academy.xebia.com\/upskilling\/kotlin-academy\/\" target=\"_blank\" rel=\"noreferrer noopener\">Kotlin \uc5ed\ub7c9 \uac15\ud654 \ud504\ub85c\uadf8\ub7a8<\/a>\ub3c4 \uc6b4\uc601\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4.<\/em><\/p>\n<p><em>\uc774 \uae00\uc740 <\/em><strong><em>Java \uae30\ubc18 \ud658\uacbd\uc5d0\uc11c Kotlin\uc744 \uc131\uacf5\uc801\uc73c\ub85c \ub3c4\uc785\ud558\uae30 \uc704\ud55c \uc644\ubcbd \uac00\uc774\ub4dc<\/em><\/strong><em>\ub77c\ub294 \uc81c\ubaa9\uc758 \uc2dc\ub9ac\uc988 \uc911 \uccab \ubc88\uc9f8 \uae00\uc785\ub2c8\ub2e4. \uc774 \uc2dc\ub9ac\uc988\ub294 \ud55c \uac1c\ubc1c\uc790\uc758 \ud638\uae30\uc2ec\uc5d0\uc11c \uc2dc\uc791\ud558\uc5ec \ud68c\uc0ac \uc804\uccb4\uc758 \ubcc0\ud654\ub85c \uc774\uc5b4\uc9c0\ub294 \uacfc\uc815\uc744 \ud1b5\ud574 \uc2e4\uc81c \ud300 \ub0b4\uc5d0\uc11c Kotlin \ub3c4\uc785\uc774 \uc5b4\ub5bb\uac8c \uc810\uc9c4\uc801\uc73c\ub85c \ud655\ub300\ub418\ub294\uc9c0 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4.<\/em><\/p>\n<p><strong>\uc774 \uc2dc\ub9ac\uc988\uc758 \uc804\uccb4 \uae00:<\/strong><\/p>\n<ol>\n<li><a href=\"https:\/\/blog.jetbrains.com\/ko\/kotlin\/2025\/12\/getting-started-with-kotlin-for-java-developers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Java \uac1c\ubc1c\uc790\ub97c \uc704\ud55c Kotlin \uc2dc\uc791\ud558\uae30<\/a><\/li>\n<li><a href=\"https:\/\/blog.jetbrains.com\/ko\/kotlin\/2026\/01\/evaluating-kotlin-in-real-projects\/\" target=\"_blank\" rel=\"noopener\" data-type=\"link\" data-id=\"https:\/\/blog.jetbrains.com\/kotlin\/2025\/10\/evaluating-kotlin-in-real-projects\/\">\uc2e4\uc81c \ud504\ub85c\uc81d\ud2b8\uc5d0\uc11c Kotlin \ud3c9\uac00\ud558\uae30<\/a><\/li>\n<li><a href=\"https:\/\/blog.jetbrains.com\/ko\/kotlin\/2026\/01\/growing-kotlin-adoption-in-your-company\/\" target=\"_blank\" rel=\"noopener\">\ud68c\uc0ac\uc5d0 Kotlin \ub3c4\uc785 \ud655\uc7a5\ud558\uae30<\/a><\/li>\n<li><a href=\"https:\/\/blog.jetbrains.com\/ko\/kotlin\/2026\/01\/helping-decisionmakers-say-yes-to-kotlin\/\" target=\"_blank\" rel=\"noreferrer noopener\" data-type=\"link\" data-id=\"https:\/\/blog.jetbrains.com\/kotlin\/2025\/11\/helping-decision-makers-say-yes-to-kotlin\/\">Kotlin \ub3c4\uc785\uc5d0 \ub300\ud55c \uc758\uc0ac\uacb0\uc815\uad8c\uc790\uc758 \ub3d9\uc758 \uc774\ub04c\uc5b4\ub0b4\uae30<\/a><\/li>\n<li><a href=\"http:\/\/blog.jetbrains.com\/ko\/kotlin\/2026\/01\/scaling-kotlin-adoption-across-your-organization\/\">\uc870\uc9c1 \uc804\ubc18\uc73c\ub85c Kotlin \ub3c4\uc785 \ud655\uc7a5\ud558\uae30<\/a><\/li>\n<\/ol>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n<p class=\"has-text-align-left\">&#8220;<em>Kotlin\uc73c\ub85c\uc758 \uc804\ud658\uc740 \ud558\ub8fb\ubc24 \uc0ac\uc774\uc5d0 \uc774\ub8e8\uc5b4\uc9c8 \uc218 \uc788\ub294 \uc77c\uc774 \uc544\ub2d9\ub2c8\ub2e4.<\/em><\/p>\n<p class=\"has-text-align-left\"><em>\ud22c\uc790\ub97c \ub450 \ubc30\ub85c \ub298\ub9ac\uae30 \uc804\uc5d0 \uc704\ud5d8\uc744 \uc81c\uac70\ud558\uace0,<\/em><\/p>\n<p class=\"has-text-align-left\"><em>\ucca0\uc800\ud55c \ud3c9\uac00\ub97c \uc2e4\uc2dc\ud558\uace0, \uc131\uacfc\ub97c \ub2ec\uc131\ud558\uc138\uc694.<\/em>\u201d<\/p>\n<p>\uc774\ubbf8 Java\uac00 \uc790\ub9ac \uc7a1\uc740 \ud658\uacbd\uc5d0\uc11c Kotlin\uc744 \ub3c4\uc785\ud558\ub824\uba74 \ub2e8\uc21c\ud788 \uae30\uc220\uc801\uc778 \uacb0\uc815\uc774 \uc544\ub2c8\ub77c \uc2e0\uc911\ud55c \uacc4\ud68d, \uc804\ub7b5\uc801 \uc0ac\uace0, \uadf8\ub9ac\uace0 \uac00\uc7a5 \uc911\uc694\ud55c \uac83\uc73c\ub85c \ub3d9\ub8cc\uc758 \uc9c0\uc6d0\uacfc \uc774\ud574\ub97c \uc5bb\ub294 \uacfc\uc815\uc774 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n<p>1,000\uba85\uc774 \ub118\ub294 \uac1c\ubc1c\uc790\ub97c \uad50\uc721\ud558\uace0 \uc218\ub9ce\uc740 \uc870\uc9c1\uc774 Kotlin\uc73c\ub85c \uc131\uacf5\uc801\uc73c\ub85c \uc804\ud658\ud558\ub3c4\ub85d \ub3c4\uc6b4 \uacbd\ud5d8\uc744 \ud1b5\ud574 \uc5b4\ub5a4 \uc811\uadfc \ubc29\uc2dd\uc774 \ud6a8\uacfc\uc801\uc774\uace0 \ud6a8\uacfc\uc801\uc774\uc9c0 \uc54a\uc740\uc9c0 \uc54c\uac8c \ub418\uc5c8\uc2b5\ub2c8\ub2e4. \uc774 \uac00\uc774\ub4dc\uc5d0\uc11c\ub294 \uccab \uc2e4\ud5d8\uc801 \uc2dc\ub3c4\ubd80\ud130 \ub300\uaddc\ubaa8 \uc870\uc9c1\uc801 \uc804\ud658\uae4c\uc9c0, \uc624\ub79c \uae30\uac04\uc5d0 \uac78\uccd0 \uc218\uc9d1\ud55c Kotlin \ub3c4\uc785\uc758 \uc131\uacf5 \uc0ac\ub840\ub97c \uc548\ub0b4\ud569\ub2c8\ub2e4.<\/p>\n<p>\uc5ec\uae30\uc11c\ub294 \uc5ec\ub7ec\ubd84\uc744 \ub2e4\uc74c\uacfc \uac19\uc740 \uc5ec\uc815\uc73c\ub85c \uc548\ub0b4\ud569\ub2c8\ub2e4.<\/p>\n<ul>\n<li>\ubcc0\ud654\uc758 \uc2dc\uc791\uc740 \uc5b8\uc81c\ub098 \ub098\ub85c\ubd80\ud130!<\/li>\n<li>\uc2dc\ud5d8 \ub2e8\uacc4: \uc18c\uaddc\ubaa8 \ud14c\uc2a4\ud2b8\ubd80\ud130 \uc2dc\uc791<\/li>\n<li>\ud3c9\uac00 \ub2e8\uacc4: \uc2dc\ud5d8 \ub2e8\uacc4\ub97c \ubc97\uc5b4\ub098 Kotlin \uc0ac\uc6a9 \ud655\uc7a5<\/li>\n<li>\uacf5\uac10 \uc5bb\uae30: \ub3d9\ub8cc \uac1c\ubc1c\uc790\ub85c\ubd80\ud130 \uc778\uc815\uacfc \uc9c0\uc6d0 \ubc1b\uae30<\/li>\n<li>\uacbd\uc601\uc9c4 \uc124\ub4dd: Kotlin\uc758 \ube44\uc988\ub2c8\uc2a4 \uc0ac\ub840 \ud655\ub9bd<\/li>\n<li>\ub300\uaddc\ubaa8 Kotlin \ub3c4\uc785\uc758 \uc131\uacf5 \uc694\uc778<\/li>\n<li>Kotlin\uc73c\ub85c \uac08 \uac83\uc778\uac00, \ub9d0 \uac83\uc778\uac00 \uadf8\uac83\uc774 \ubb38\uc81c\ub85c\ub2e4: \uc6d0\ud558\ub294 \ud68c\uc0ac\uc758 \ubbf8\ub798\ub294 \ubb34\uc5c7\uc778\uac00?<\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\"><strong>\ubcc0\ud654\uc758 \uc2dc\uc791\uc740 \uc5b8\uc81c\ub098 \ub098\ub85c\ubd80\ud130!<\/strong><\/h2>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-647072\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/10\/unnamed-12.png\" alt=\"\ubcc0\ud654\uc758 \uc2dc\uc791\uc740 \uc5b8\uc81c\ub098 \ub098\ub85c\ubd80\ud130!\" width=\"1586\" height=\"526\" \/><\/figure>\n<p><em>\uad73\uc774 Kotlin\uc73c\ub85c \uc804\ud658\ud574\uc57c \ud558\ub098\uc694? Java\ub97c \uacc4\uc18d \uc0ac\uc6a9\ud558\uba74 \ub418\uc9c0 \uc54a\ub098\uc694?\u00a0<\/em><\/p>\n<p>\ub300\ub2f5\uc740 \uc5ec\ub7ec \uac00\uc9c0 \uc694\uc778\uc5d0 \ub530\ub77c \ub2ec\ub77c\uc9d1\ub2c8\ub2e4. \ub370\uc774\ud130\uc5d0 \ub530\ub974\uba74 Kotlin\uc774 \uc5ec\ub7ec \uba74\uc5d0\uc11c \uc7a5\uc810\uc774 \uc788\ub294 \uac83\uc740 \ubd84\uba85\ud558\uc9c0\ub9cc, \uacb0\uc815\uc740 \uc21c\uc804\ud788 \uae30\uc220\uc801\uc778 \uc774\uc720\ub85c \ub0b4\ub824\uc9c0\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \uc0ac\ub78c\ub4e4\uc758 \uc8fc\uad00\uc801\uc778 \uc120\ud638\ub3c4(&#8220;\ub098\ub294 \ub0b4 \uc5b8\uc5b4\ub97c \uc88b\uc544\ud558\uae30 \ub54c\ubb38\uc5d0 \uc88b\uc544\ud55c\ub2e4&#8221;)\uc640 \uc0c8\ub85c\uc6b4 \uac83\uc5d0 \ub300\ud55c \ud68c\uc758\uc801 \ud0dc\ub3c4(\uc77c\ubc18\uc801\uc73c\ub85c \uc88b\uc740 \ud604\uc0c1)\uac00 \uc911\uc694\ud55c \uc5ed\ud560\uc744 \ud569\ub2c8\ub2e4.<\/p>\n<p>\ud558\uc9c0\ub9cc \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc758 \uc9c4\ud654\ub97c \ubcf4\uba74 \uc6b0\ub9ac\uc758 \uc120\ud638\ub3c4\uc640 \uc694\uad6c \uc0ac\ud56d\ub3c4 \uc2dc\uac04\uc774 \uc9c0\ub0a8\uc5d0 \ub530\ub77c \ubcc0\ud55c\ub2e4\ub294 \uac83\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uac00\uc7a5 \uc911\uc694\ud55c \uc810\uc740, \uc0c8\ub85c\uc6b4 \uc138\ub300\uc758 \uc5b8\uc5b4\uac00 \ub098\uc62c \ub54c\ub9c8\ub2e4 \uc0c8\ub85c\uc6b4 \ud328\ub7ec\ub2e4\uc784(Null \uc548\uc804\uc131, \uac04\uacb0\ud558\uace0 \uac00\ubcbc\uc6b4 \uad6c\ubb38, \uae30\ubcf8 \uad6c\uc131 \uc694\uc18c\ub85c\uc11c\uc758 \ud568\uc218, \ud48d\ubd80\ud55c \ud45c\uc900 \ub77c\uc774\ube0c\ub7ec\ub9ac, \ube44\ub3d9\uae30 \ub3d9\uc2dc\uc131, \uba40\ud2f0\ud50c\ub7ab\ud3fc \uc9c0\uc6d0, \uc0dd\uc131\ud615 AI \uce5c\ud654\uc131 \ub4f1)\uc774 \ud1b5\ud569\ub418\uc5b4 \uac1c\ubc1c\uc790\uc640 \uc870\uc9c1\uc5d0 \uacb0\uc815\uc801\uc778 \uc774\uc810\uc744 \uc81c\uacf5\ud55c\ub2e4\ub294 \uac83\uc785\ub2c8\ub2e4.<\/p>\n<p>\uc774\ub7ec\ud55c \uc790\uc5f0\uc2a4\ub7ec\uc6b4 \uc9c4\ud654\uac00 \uc5c6\uc5c8\ub2e4\uba74 \uc6b0\ub9ac\ub294 \uc544\uc9c1\ub3c4 COBOL\uc774\ub098 \ub2e4\ub978 \uace0\ub300 \uc5b8\uc5b4\ub85c \ubaa8\ub4e0 \ucf54\ub4dc\ub97c \uc791\uc131\ud558\uace0 \uc788\uc5c8\uc744 \uac83\uc774\uace0, \uc774\ub294 \ud655\uc2e4\ud788 \uc624\ub298\ub0a0\uc758 \uc694\uad6c \uc0ac\ud56d\uc744 \ucda9\uc871\ud558\uc9c0 \ubabb\ud588\uc744 \uac83\uc785\ub2c8\ub2e4. \uadf8\ub7ec\ubbc0\ub85c \uc9c4\ud654\ub294 \uc120\ud0dd\uc774 \uc544\ub2c8\ub77c \uc5c5\uacc4 \uc5ed\uc0ac\uc758 \ubd88\uac00\ud53c\ud55c \ubd80\ubd84\uc785\ub2c8\ub2e4.<\/p>\n<p>\ud558\uc9c0\ub9cc \uae30\uc220\uc801 \uc774\uc810\ub9cc\uc73c\ub85c\ub294 \uadf8\ub7ec\ud55c \ubcc0\ud654\uac00 \ud68c\uc0ac\uc5d0 \ubfcc\ub9ac\ub97c \ub0b4\ub9ac\uae30\uc5d0 \ucda9\ubd84\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \uc774\ub97c \uc704\ud574\uc11c\ub294 \ucd94\uc9c4\uc790, \uc989 \uc0c8\ub85c\uc6b4 \ud328\ub7ec\ub2e4\uc784\uc744 \uc2e4\uc81c\ub85c \ud0d0\uad6c\ud558\uace0, \uc9c0\uc9c0\ud558\uace0, \uadf8 \uac00\uce58\ub97c \uc785\uc99d\ud558\ub824\ub294 \uc0ac\ub78c\uc774 \ud544\uc694\ud569\ub2c8\ub2e4. \uc81c \uacbd\ud5d8\uc5d0 \ub530\ub974\uba74 Kotlin \ub3c4\uc785\uc744 \ucd09\uc9c4\ud558\ub294 \uc5d4\uc9c0\ub2c8\uc5b4\ub294 \uc77c\ubc18\uc801\uc73c\ub85c \uc138 \uac00\uc9c0 \uc720\ud615\uc774 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<ol>\n<li><strong>\uc2e4\uc6a9\uc801\uc774\uace0 \uc0dd\uc0b0\uc131 \uc9c0\ud5a5\uc801\uc778 Java \uc5d4\uc9c0\ub2c8\uc5b4<\/strong>: Java\ub97c \uc885\uad50\uac00 \uc544\ub2cc \ub3c4\uad6c\ub85c \ubcf4\ub294 \uc219\ub828\ub41c \uac1c\ubc1c\uc790\uc785\ub2c8\ub2e4. \uc774\ub4e4\uc740 \ub04a\uc784\uc5c6\uc774 \uc791\uc5c5\uc744 \ub354 \ube68\ub9ac \uc644\ub8cc\ud560 \uc218 \uc788\ub294 \ub354 \ub098\uc740 \ubc29\ubc95\uc744 \ucc3e\uc2b5\ub2c8\ub2e4.<\/li>\n<li><strong>\ud488\uc9c8\uc744 \uc911\uc2dc\ud558\ub294 \ucd5c\uc2e0 \uc5b8\uc5b4 \uc560\ud638\uac00<\/strong>: \ucf54\ub4dc \uac00\ub3c5\uc131, \uac04\uacb0\uc131, \uc720\uc9c0 \uad00\ub9ac\ub97c \uc6b0\uc120\uc2dc\ud558\ub294 \uc5d4\uc9c0\ub2c8\uc5b4\uc785\ub2c8\ub2e4. \uc774\ub4e4\uc740 \uc774\uc804\uc5d0 Scala\ub85c \uc804\ud658\ud55c \uacbd\uc6b0\uac00 \ub9ce\uc2b5\ub2c8\ub2e4.<\/li>\n<li><strong>\ucd08\ubcf4 \uac1c\ubc1c\uc790<\/strong>: &#8220;Kotlin\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294\ub370 \uc65c Java\ub97c \uc0ac\uc6a9\ud574\uc57c \ud558\ub098\uc694?&#8221;\uc640 \uac19\uc774 \ub2e8\uc21c\ud558\uc9c0\ub9cc \uac15\ub82c\ud55c \uc9c8\ubb38\uc744 \ub358\uc9c0\ub294 \ucd08\ubcf4\uc790\uc785\ub2c8\ub2e4. \uc218\ub144\uac04\uc758 Java \uacbd\ud5d8\uc774\ub77c\ub294 \ubd80\ub2f4\uc774 \uc5c6\uae30 \ub54c\ubb38\uc5d0, Kotlin\uc740 \uc774\ub4e4\uc5d0\uac8c \uace0\ubbfc\ud560 \ud544\uc694\ub3c4 \uc5c6\ub294 \uc120\ud0dd\uc9c0\uc778 \uacbd\uc6b0\uac00 \ub9ce\uc2b5\ub2c8\ub2e4.<\/li>\n<\/ol>\n<p>\uc5ec\ub7ec\ubd84\uc740 \uc5b4\ub290 \uadf8\ub8f9\uc5d0 \uc18d\ud558\ub098\uc694?<\/p>\n<p>\uc774\ub7ec\ud55c \ucd08\uae30 \ub3c4\uc785\uc790\ub4e4\uc740 \ubcc0\ud654\uc758 \uccab \uc2dc\uc791\uc744 \ubc1d\ud799\ub2c8\ub2e4. \ud558\uc9c0\ub9cc \uc5b4\ub5bb\uac8c \uc2dc\uc791\ud574\uc57c \ud560\uae4c\uc694? \uacc4\uc18d \uc77d\uc5b4\ubcf4\uc138\uc694. ;-)<\/p>\n<h2 class=\"wp-block-heading\"><strong>\uc2dc\ud5d8 \ub2e8\uacc4: \uc18c\uaddc\ubaa8 \ud14c\uc2a4\ud2b8\ubd80\ud130 \uc2dc\uc791<\/strong><\/h2>\n<p>Kotlin\uc5d0 \ub300\ud574 \ub4e4\uc5b4\ubcf4\uc558\uace0, \ubcf8\uaca9\uc801\uc73c\ub85c \ucc44\ud0dd\ud558\uae30 \uc804\uc5d0 \uc2dc\ud5d8\uc801\uc73c\ub85c \uc0ac\uc6a9\ud574 \ubcf4\uace0 \uc2f6\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\uac00\uc7a5 \uba3c\uc800 \ud544\uc694\ud55c \uac83\uc740 \uc5ec\ub7ec\ubd84\uc758 \uccab \ubc88\uc9f8 Kotlin \uc528\uc557\uc744 \uc2ec\uc744 \uc218 \uc788\ub294 \uac1c\ubc1c\uc790 \ub3c4\uad6c\uc785\ub2c8\ub2e4. \ub2e4\uc74c\uacfc \uac19\uc740 \uba87 \uac00\uc9c0 \uc120\ud0dd\uc9c0\uac00 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<ul>\n<li><a href=\"https:\/\/play.kotlinlang.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/play.kotlinlang.org\/<\/a>\ub294 Kotlin \ucf54\ub4dc\ub97c \uac04\ub2e8\ud788 \uc785\ub825\ud558\uace0 \uc2e4\ud589\ud560 \uc218 \uc788\ub294 \ud6cc\ub96d\ud55c \uc628\ub77c\uc778 \uc6cc\ud06c\uc20d\uc73c\ub85c, JVM\ubfd0\ub9cc \uc544\ub2c8\ub77c \ub2e4\ub978 \ub2e4\uc591\ud55c \ud50c\ub7ab\ud3fc(JS, WASM \ub4f1)\uc5d0\uc11c\ub3c4 \uc2e4\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<img decoding=\"async\" loading=\"lazy\" class=\"wp-image-647084\" style=\"width: 650px;\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/10\/unnamed-13.png\" alt=\"Kotlin \ud50c\ub808\uc774\uadf8\ub77c\uc6b4\ub4dc\" width=\"1462\" height=\"660\" \/><\/li>\n<\/ul>\n<ul>\n<li><a href=\"https:\/\/kotlinlang.org\/docs\/kotlin-notebook-overview.html\" target=\"_blank\" rel=\"noreferrer noopener\">Kotlin Notebook<\/a>\uc740 IntelliJ IDEA\uc758 \uac15\ub825\ud55c \uae30\ub2a5\uc73c\ub85c, \uc885\uc18d\uc131\uc744 \uc27d\uac8c \uac00\uc838\uc624\uace0, \ucf54\ub4dc\ub97c \uc2e4\ud589\ud558\uace0, \ub370\uc774\ud130\ub97c \ucc98\ub9ac\ud558\uace0 \ucc28\ud2b8\ub97c \ub9cc\ub4dc\ub294 \uc791\uc5c5\uae4c\uc9c0 \uc218\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub2e4\uc74c \uc608\uc2dc\ub294 Spring\uc758 RestClient\ub97c \uc0ac\uc6a9\ud558\uc5ec REST \ud638\ucd9c\uc744 \uc218\ud589\ud558\uae30\uac00 \uc5bc\ub9c8\ub098 \uc26c\uc6b4\uc9c0 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4.<img decoding=\"async\" loading=\"lazy\" class=\"wp-image-647095\" style=\"width: 650px;\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/10\/unnamed-11.png\" alt=\"Kotlin Notebook\" width=\"1600\" height=\"1035\" \/><\/li>\n<\/ul>\n<ul>\n<li>IntelliJ IDEA\ub294 Kotlin\uc5d0 \ub300\ud55c \ucd5c\uace0 \uc218\uc900\uc758 \uc9c0\uc6d0\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4. \uc774\ub294 \ub180\ub77c\uc6b4 \uc77c\uc774 \uc544\ub2d9\ub2c8\ub2e4. JetBrains\uac00 Kotlin\uc758 \uc81c\uc791\uc790\uc774\uace0 IntelliJ IDEA\uc758 \ub9ce\uc740 \ubd80\ubd84\uc774 Kotlin\uc73c\ub85c \uc791\uc131\ub418\uc5c8\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4. \ub530\ub77c\uc11c <a href=\"https:\/\/www.jetbrains.com\/help\/idea\/get-started-with-kotlin.html#add-kotlin-dependency\" target=\"_blank\" rel=\"noreferrer noopener\">IntelliJ IDEA<\/a>\uc5d0\uc11c Kotlin\uc744 \uc0ac\uc6a9\ud558\uae30\uac00 \uc544\uc8fc \uac04\ub2e8\ud558\uace0, \uae30\uc874 Java \ud504\ub85c\uc81d\ud2b8\uc5d0\uc11c\ub3c4 \ub9c8\ucc2c\uac00\uc9c0\uc785\ub2c8\ub2e4.\n<ul>\n<li><a href=\"https:\/\/kotlinlang.org\/docs\/maven.html\" target=\"_blank\" rel=\"noreferrer noopener\">Maven<\/a>\uc758 \uacbd\uc6b0, \uac04\ub2e8\ud788 <code>kotlin-maven-plugin<\/code>\uacfc Kotlin \ud45c\uc900 \ub77c\uc774\ube0c\ub7ec\ub9ac\uc778 <code>kotlin-stdlib<\/code>\ub9cc \uad6c\uc131\ud558\uba74 \ub429\ub2c8\ub2e4.<\/li>\n<li><a href=\"https:\/\/kotlinlang.org\/docs\/gradle-configure-project.html\" target=\"_blank\" rel=\"noreferrer noopener\">Gradle<\/a>\uc758 \uacbd\uc6b0 Kotlin \ud50c\ub7ec\uadf8\uc778\uc744 \uad6c\uc131\ud574\uc57c \ud569\ub2c8\ub2e4.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u2026\uadf8\ub7ec\uba74 \uc774\uc81c \uc2dc\uc791\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4!<\/p>\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-647106\" style=\"aspect-ratio: 1.1216216216216217; width: 320px; height: auto;\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/10\/unnamed-14.png\" alt=\"\" width=\"498\" height=\"444\" \/><\/figure>\n<ul>\n<li>\uc5ec\uae30\uc11c \ub05d\uc774 \uc544\ub2d9\ub2c8\ub2e4! JetBrains\ub294 \ucd5c\uadfc Kotlin \uc5b8\uc5b4 \uc11c\ubc84\ub97c \ucd9c\uc2dc\ud558\uc5ec VS Code\uc640 \uac19\uc740 IntelliJ IDEA \uc774\uc678\uc758 IDE\uc5d0\uc11c\ub3c4 \uc644\ubcbd\ud55c \uae30\ub2a5\uc744 \uac16\ucd98 Kotlin \uac1c\ubc1c \ud658\uacbd\uc744 \uc81c\uacf5\ud588\uc2b5\ub2c8\ub2e4. \uad00\ub828 \uc6f9\uc0ac\uc774\ud2b8: <a href=\"https:\/\/github.com\/Kotlin\/kotlin-lsp\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/github.com\/Kotlin\/kotlin-lsp<\/a><\/li>\n<\/ul>\n<p>\uc774\uc81c \uc6d0\ud558\ub294 \uac1c\ubc1c \ud658\uacbd\uc5d0\uc11c Kotlin \ucf54\ub4dc\ub97c \uc791\uc131\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ucd5c\uc18c\ud55c\uc758 \uc601\ud5a5\uc73c\ub85c \ucd5c\ub300\uc758 \uc778\uc0ac\uc774\ud2b8\ub97c \uc5bb\uc73c\uba74\uc11c \uc2e4\uc81c \ud658\uacbd\uc5d0\uc11c \uc5b8\uc5b4\ub97c \ud3c9\uac00\ud558\ub824\uba74 \uc5b4\ub5bb\uac8c \ud574\uc57c \ud560\uae4c\uc694? \uae30\uc874 Java \ud504\ub85c\uc81d\ud2b8\uc758 \ud14c\uc2a4\ud2b8 \uae30\ub2a5\uc744 \uc774\uc6a9\ud558\uba74 \ub429\ub2c8\ub2e4!<\/p>\n<p>Kotlin\uc744 \uc548\uc804\ud558\uace0 \ud604\uc2e4\uc801\uc73c\ub85c \uc2dc\ud5d8\ud574\ubcfc \uc218 \uc788\ub294 \uc774 \ubc29\ubc95\uc5d0\ub294 \uba87 \uac00\uc9c0 \uc7a5\uc810\uc774 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<ul>\n<li><strong>\ub0ae\uc740 \uc704\ud5d8<\/strong>: \ud14c\uc2a4\ud2b8\ub85c \uc778\ud574 \ud504\ub85c\ub355\uc158 \ucf54\ub4dc\uc5d0 \uc601\ud5a5\uc744 \ubbf8\uce58\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/li>\n<li><strong>\ud559\uc2b5 \uae30\ud68c<\/strong>: \uc775\uc219\ud55c \ud658\uacbd\uc5d0\uc11c \uc5b8\uc5b4\uc758 \ud2b9\uc9d5\uc744 \uc0b4\ud3b4\ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<li><strong>\uc810\uc9c4\uc801\uc778 \ub3c4\uc785<\/strong>: \ud300\uc6d0\ub4e4\uc774 \uc555\ubc15\uac10 \uc5c6\uc774 Kotlin \uad6c\ubb38\uc5d0 \uc775\uc219\ud574\uc9c8 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<\/ul>\n<h3 class=\"wp-block-heading\"><strong>\ud301<\/strong><\/h3>\n<ol>\n<li>Kotest + MockK \uc0ac\uc6a9\ud558\uae30: Kotlin\uc758 \ud14c\uc2a4\ud2b8 DSL(\ub3c4\uba54\uc778 \ud2b9\uc815 \uc5b8\uc5b4)\uc774 \uac00\uc9c4 \ud45c\ud604\ub825\uc744 \uc989\uc2dc \uacbd\ud5d8\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc5ec\uae30\uc5d0\ub294 \uae30\ub2a5\uc774 \ud48d\ubd80\ud55c \uc5b4\uc124\uc158(<code>shouldHaveSize(...)<\/code>), infix(<code>value shouldBe 1<\/code>) \ub4f1\uc774 \ud3ec\ud568\ub429\ub2c8\ub2e4.<\/li>\n<li>Java \uc2a4\ud2b8\ub9bc \ub300\uc2e0 \uac04\uacb0\ud558\uba74\uc11c\ub3c4 \uac15\ub825\ud55c Kotlin \uceec\ub809\uc158\uc744 \uc0ac\uc6a9\ud558\uc138\uc694.<\/li>\n<li>Null \uac00\ub2a5 \ud0c0\uc785, \uad6c\uc870 \ubd84\ud574, \ubd88\ubcc0\uc131(<code>val<\/code>, <code>data classes<\/code>), \ud45c\ud604\uc2dd \uad6c\ubb38(<code>when<\/code>, <code>try-catch<\/code>, <code>if else<\/code>) \ub4f1 \ub2e4\uc591\ud55c \uc5b8\uc5b4 \uae30\ub2a5\uc744 \uacbd\ud5d8\ud574 \ubcf4\uc138\uc694.<\/li>\n<\/ol>\n<p>\ub2e4\uc74c\uacfc \uac19\uc740 \uacb0\uacfc\ub97c \uc5bb\uac8c \ub429\ub2c8\ub2e4.<\/p>\n<p><strong>Java<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@Test\nvoid shouldGetAverageRating() {\n   when(productRepository.findAll()).thenReturn(products);\n\n   Map ratings = productService.averageRatings();\n\n   assertAll(\n           () -&gt; assertThat(ratings).hasSize(4),\n           () -&gt; assertEquals(ratings, products\n                   .stream()\n                   .collect(Collectors.groupingBy(\n                           Product::getName,\n                           Collectors.flatMapping(\n                                   p -&gt; p.getRatings()\n                                    .stream()\n                                    .mapToDouble(Integer::doubleValue)\n                                    .boxed(),   \n                              Collectors.averagingDouble(Double::doubleValue)\n                           )))\n           )\n   );\n   verify(productRepository).findAll();\n\n}\n<\/pre>\n<p><strong>Kotlin<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"kotlin\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@Test\nfun `should get average rating`() { \/\/descriptive tests using ``\n   every { productRepository.findAll() } returns products\n\n   val ratings = productService.averageRatings()\n\n   assertSoftly(ratings) { \t\t\/\/powerful testing DSLs (Kotest)\n       shouldHaveSize(4)\n       this shouldBe productRepository.findAll()\n           .groupBy { it.name }   \t\t\t\/\/concise collections\n           .mapValues { (_, products) -&gt; \t\t\/\/destructuring\n                  products.flatMap { it.ratings }.average() }\n   }\n    verify { productRepository.findAll() }\n}<\/pre>\n<h3 class=\"wp-block-heading\">\uc2dc\ub9ac\uc988\uc758 \ub2e4\uc74c \uac8c\uc2dc\ubb3c<\/h3>\n<p>Kotlin \ub3c4\uc785\uc740 \ubcf4\ud1b5 \ud55c \uc0ac\ub78c\uc774 \uc0ac\uc6a9\ud574 \ubcf4\uace0 \uba87 \uac00\uc9c0 \ud14c\uc2a4\ud2b8\uac00 \uc720\uc6a9\ud55c \uac83\uc73c\ub85c \uc785\uc99d\ub418\uba74\uc11c \uc2dc\uc791\ub429\ub2c8\ub2e4. \uc774\ub7ec\ud55c \ucd08\uae30 \ud0d0\uc0c9 \uacfc\uc815\uc740 \uc790\uc5f0\uc2a4\ub7fd\uac8c \ub354\uc6b1 \ub300\ub2f4\ud55c \ubaa9\ud45c\ub85c \uc774\uc5b4\uc9d1\ub2c8\ub2e4. \uc989, \uc2e4\uc81c \ud504\ub85c\uc81d\ud2b8\uc5d0\uc11c Kotlin\uc744 \ud3c9\uac00\ud558\ub294 \uac83\uc785\ub2c8\ub2e4.<\/p>\n<p>\uc774 \uc2dc\ub9ac\uc988\uc758 \ub2e4\uc74c \uac8c\uc2dc\ubb3c\uc5d0\uc11c\ub294 \uc774 \ub2e8\uacc4\ub97c \ub2e4\ub8e8\uace0 \ud504\ub85c\ub355\uc158 \ud658\uacbd\uc5d0\uc11c Kotlin\uc744 \ud14c\uc2a4\ud2b8\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4.<\/p>\n<div class=\"about-author \">\n<div class=\"about-author__box\">\n<div class=\"row\">\n<div class=\"about-author__box-img\"><img decoding=\"async\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/10\/a3f7-400o400o1-QYUavRYyARnAVJLCpM1m8M.webp\" alt=\"\" \/><\/div>\n<div class=\"about-author__box-text\">\n<h4>Urs Peter<\/h4>\n<p>Urs\ub294 20\ub144 \uc774\uc0c1\uc5d0 \uac78\uccd0 Kotlin\uacfc Scala\ub97c \uc8fc\ub85c \uc0ac\uc6a9\ud558\uc5ec \ubcf5\uc6d0\ub825 \uc788\uace0 \ud655\uc7a5 \uac00\ub2a5\ud558\uba70 \uc784\ubb34 \uc218\ud589\uc5d0 \ud544\uc218\uc801\uc778 \uc2dc\uc2a4\ud15c\uc744 \uad6c\ucd95\ud55c \ud48d\ubd80\ud55c \uacbd\ud5d8\uc744 \uac00\uc9c4 \uc18c\ud504\ud2b8\uc6e8\uc5b4 \uc5d4\uc9c0\ub2c8\uc5b4\uc774\uc790 \uc194\ub8e8\uc158 \uc544\ud0a4\ud14d\ud2b8, \ucf58\ud37c\ub7f0\uc2a4 \uc5f0\uc0ac, \ud2b8\ub808\uc774\ub108\uc785\ub2c8\ub2e4.<\/p>\n<p>\ucee8\uc124\ud134\ud2b8\ub85c \ud65c\ub3d9\ud558\ub294 \uc678\uc5d0\ub3c4 \uc5f4\uc815\uc801\uc778 \ud2b8\ub808\uc774\ub108\ub85c\uc11c Kotlin \ubc0f Scala \uc5b8\uc5b4 \uacfc\uc815\ubd80\ud130 \ub9c8\uc774\ud06c\ub85c\uc11c\ube44\uc2a4 \ubc0f \uc774\ubca4\ud2b8 \uae30\ubc18 \uc544\ud0a4\ud14d\ucc98\uc5d0 \ub300\ud55c \uc544\ud0a4\ud14d\ucc98 \uad50\uc721\uae4c\uc9c0 \uad11\ubc94\uc704\ud55c \uc8fc\uc81c\ub97c \ub2e4\ub8e8\ub294 \ub2e4\uc591\ud55c \uad50\uc721 \uacfc\uc815\uc744 \uc800\uc220\ud588\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\ucc9c\uc131\uc801\uc73c\ub85c \uc0ac\uad50\uc801\uc778 \uc0ac\ub78c\uc73c\ub85c, \ubaa8\uc784\uacfc \ucf58\ud37c\ub7f0\uc2a4\uc5d0\uc11c \uc9c0\uc2dd\uc744 \uacf5\uc720\ud558\uace0 \ub3d9\ub8cc\ub4e4\uacfc \uc601\uac10\uc744 \ub098\ub204\ub294 \uac83\uc744 \uc88b\uc544\ud569\ub2c8\ub2e4. Urs\ub294 JetBrains \uc778\uc99d Kotlin \ud2b8\ub808\uc774\ub108\uc785\ub2c8\ub2e4.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"author":1191,"featured_media":671488,"comment_status":"closed","ping_status":"closed","template":"","categories":[],"tags":[],"cross-post-tag":[],"acf":[],"_links":{"self":[{"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/kotlin\/669906"}],"collection":[{"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/kotlin"}],"about":[{"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/types\/kotlin"}],"author":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/users\/1191"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/comments?post=669906"}],"version-history":[{"count":6,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/kotlin\/669906\/revisions"}],"predecessor-version":[{"id":674073,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/kotlin\/669906\/revisions\/674073"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/media\/671488"}],"wp:attachment":[{"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/media?parent=669906"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/categories?post=669906"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/tags?post=669906"},{"taxonomy":"cross-post-tag","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/cross-post-tag?post=669906"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}