{"id":344381,"date":"2023-04-21T04:06:56","date_gmt":"2023-04-21T03:06:56","guid":{"rendered":"https:\/\/blog.jetbrains.com\/?post_type=idea&p=344381"},"modified":"2023-04-21T04:07:01","modified_gmt":"2023-04-21T03:07:01","slug":"java-20-and-intellij-idea","status":"publish","type":"idea","link":"https:\/\/blog.jetbrains.com\/ko\/idea\/2023\/04\/java-20-and-intellij-idea\/","title":{"rendered":"Java 20\uacfc IntelliJ IDEA"},"content":{"rendered":"

Java 10 \uc774\ud6c4 \ud55c\ub3d9\uc548 \uc0c8\ub85c\uc6b4 Java \ub9b4\ub9ac\uc2a4\uc5d0 \ub300\ud55c \uae00\uc744 \uc4f0\uba74\uc11c \uac1c\ubc1c\uc790\ub4e4\uc774 6\uac1c\uc6d4\ub9c8\ub2e4 \uc0c8\ub85c\uc6b4 Java \uae30\ub2a5\uc744 \ubc30\uc6b0\uace0 \uc0ac\uc6a9\ud558\ub294 \ubaa8\uc2b5\uc5d0\uc11c \uc990\uac70\uc6c0\uc744 \uc5bb\uc2b5\ub2c8\ub2e4.<\/p>\n

\uc774\uc804\uc758 \uba87\uba87 \ub9b4\ub9ac\uc2a4\uc640 \ube44\uad50\ud560 \ub54c Java 20\uc5d0\ub294 \ube44\uad50\uc801 \uc801\uc740 \uae30\ub2a5\uc774 \ucd94\uac00\ub418\uc5c8\uc2b5\ub2c8\ub2e4. \ubc94\uc704 \uc9c0\uc815\ub41c \uac12<\/a>\uc744 \uc778\ud050\ubca0\uc774\ud305 API<\/a>\ub85c \ub3c4\uc785\ud558\uc5ec \uc2a4\ub808\ub4dc \ub0b4\ubd80 \ubc0f \uc2a4\ub808\ub4dc \uac04\uc5d0 \ubcc0\uacbd \ubd88\uac00\ub2a5\ud55c \ub370\uc774\ud130\ub97c \uacf5\uc720\ud560 \uc218 \uc788\ub3c4\ub85d \ud568\uc73c\ub85c\uc368 \uac00\uc0c1 \uc2a4\ub808\ub4dc\ub97c \uc9c0\uc6d0\ud569\ub2c8\ub2e4. \ub450 \ubc88\uc9f8 \ud14c\uc2a4\ud2b8 \ubc84\uc804\uc5d0\uc11c \ub808\ucf54\ub4dc \ud328\ud134<\/a>\uc740 \uc81c\ub124\ub9ad \ub808\ucf54\ub4dc \ud328\ud134\uc5d0 \ub300\ud55c \uc9c0\uc6d0\uc744 \uac1c\uc120\ud558\uace0 \ud5a5\uc0c1\ub41c for \ubb38\uc5d0\uc11c \ub808\ucf54\ub4dc \ud328\ud134\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\uac8c \ud574\uc90d\ub2c8\ub2e4. \ub124 \ubc88\uc9f8 \ud14c\uc2a4\ud2b8 \ubc84\uc804\uc5d0\uc11c switch \ud328\ud134 \uc77c\uce58<\/a>\ub294 \ud3ec\uad04\uc801\uc778 switch, \ub2e8\uc21c\ud654\ub41c switch \ub77c\ubca8 \ubc0f \uc81c\ub124\ub9ad \ub808\ucf54\ub4dc \ud328\ud134\uc5d0 \ub300\ud55c \ucd94\ub860 \ud0c0\uc785 \uc778\uc218\ub85c \uc791\uc5c5\ud560 \ub54c \uc0ac\uc6a9 \ud3b8\ub9ac\uc131\uc744 \uac1c\uc120\ud569\ub2c8\ub2e4.<\/p>\n

Java 20\uc758 \ub450 \ubc88\uc9f8 \ud14c\uc2a4\ud2b8 \ubc84\uc804\uc5d0\uc11c Foreign Function and Memory API<\/a>\ub294 Java \ucf54\ub4dc\uac00 JVM \uc678\ubd80\uc5d0\uc11c \ucf54\ub4dc \ubc0f \ub370\uc774\ud130\uc640 \ud1b5\uc2e0\ud560 \uc218 \uc788\ub3c4\ub85d \uae30\ub2a5\uc744 \uc9c0\uc18d\uc801\uc73c\ub85c \uac1c\uc120\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uad6c\uc870\ud654\ub41c \ub3d9\uc2dc\uc131<\/a>\uc744 \uae30\ubc18\uc73c\ub85c \uba40\ud2f0\uc2a4\ub808\ub4dc \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc81c\uc791 \ubc29\uc2dd\uc744 \ud601\uc2e0\uc801\uc73c\ub85c \ubcc0\ud654\uc2dc\ud0ac \uacbd\ub7c9 \uc2a4\ub808\ub4dc\uc778 \uac00\uc0c1 \uc2a4\ub808\ub4dc<\/a>\uac00 \ucd5c\uc2e0 Java \ub9b4\ub9ac\uc2a4\uc758 \ub610 \ub2e4\ub978 \ud14c\uc2a4\ud2b8 \ubc84\uc804\uc73c\ub85c \ub098\uc654\uc2b5\ub2c8\ub2e4. \ud604\uc7ac \ub2e4\uc12f \ubc88\uc9f8 \ud14c\uc2a4\ud2b8 \ubc84\uc804\uc778 Vector API<\/a>\ub294 \ucf54\ub4dc\uc5d0\uc11c \ubca1\ud130 \uacc4\uc0b0 \uc791\uc5c5\uc744 \ub3c4\uc640\uc90d\ub2c8\ub2e4.<\/p>\n

\uc774 \ube14\ub85c\uadf8 \uae00\uc5d0\uc11c\ub294 switch \ub808\ucf54\ub4dc \ud328\ud134 \ubc0f \ud328\ud134 \uc77c\uce58\uc640 \uac19\uc740 \uc5b8\uc5b4 \uae30\ub2a5\uc5d0 \ub300\ud55c IntelliJ IDEA \uc9c0\uc6d0, \ud2b9\ud788 \uc81c\ub124\ub9ad \ub808\ucf54\ub4dc \ud328\ud134\uc5d0 \ub300\ud55c \ud0c0\uc785 \ucd94\ub860\uc744 \ud1b5\ud55c \ud5a5\uc0c1\ub41c \uc9c0\uc6d0, \ud3ec\uad04\uc801\uc778 switch \ubb38\uacfc \ud45c\ud604\uc2dd, \ud5a5\uc0c1\ub41c for<\/code> \ud5e4\ub354\uc5d0\uc11c \ub808\ucf54\ub4dc \ud328\ud134\uacfc \uac19\uc740 \uac00\uc7a5 \ud765\ubbf8\ub85c\uc6b4 \ubcc0\uacbd \uc0ac\ud56d\uc744 \ub2e4\ub8e8\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n

\uadf8\ub7fc \uc2dc\uc791\ud574\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n

\"\"<\/figure>\n

IntelliJ IDEA \uad6c\uc131<\/h2>\n

Java 20\uc5d0 \ub300\ud55c \uc9c0\uc6d0\uc740 IntelliJ IDEA 2023.1\uc5d0\uc11c \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ud5a5\ud6c4 IntelliJ IDEA \ub9b4\ub9ac\uc2a4\uc5d0\uc11c \ub354 \ub9ce\uc740 \uc9c0\uc6d0\uc774 \uc81c\uacf5\ub420 \uc608\uc815\uc785\ub2c8\ub2e4.<\/p>\n

Java 20\uc758 switch \ub808\ucf54\ub4dc \ud328\ud134 \ubc0f \ud328\ud134 \uc77c\uce58\uc640 \uac19\uc740 \uc0c8\ub85c\uc6b4 \uc5b8\uc5b4 \uae30\ub2a5\uc744 \uc0ac\uc6a9\ud558\ub824\uba74 ProjectSettings(\ud504\ub85c\uc81d\ud2b8 \uc124\uc815) | Project(\ud504\ub85c\uc81d\ud2b8)<\/i>\ub85c \uc774\ub3d9\ud558\uc5ec Project SDK\ub97c 20\uc73c\ub85c \uc124\uc815\ud558\uace0 \ud504\ub85c\uc81d\ud2b8 \uc5b8\uc5b4 \uc218\uc900\uc744 20 (Preview) \u2013 Record patterns (second preview), Pattern Matching for switch (fourth preview)(20(\ud14c\uc2a4\ud2b8 \ubc84\uc804) – \ub808\ucf54\ub4dc \ud328\ud134(\ub450 \ubc88\uc9f8 \ud14c\uc2a4\ud2b8 \ubc84\uc804), switch \ud328\ud134 \uc77c\uce58(\ub124 \ubc88\uc9f8 \ud14c\uc2a4\ud2b8 \ubc84\uc804))<\/i>\ub85c \uc124\uc815\ud569\ub2c8\ub2e4.<\/p>\n

\"\"<\/figure>\n

\uc774\ubbf8 \uc2dc\uc2a4\ud15c\uc5d0 \ub2e4\uc6b4\ub85c\ub4dc\ud55c \uc784\uc758 \ubc84\uc804\uc758 JDK\ub97c \uc0ac\uc6a9\ud558\uac70\ub098 Edit(\ud3b8\uc9d1)<\/i>\uc744 \ud074\ub9ad\ud55c \ub2e4\uc74c Add SDK >(SDK \ucd94\uac00)<\/i>\ub97c \uc120\ud0dd\ud558\uace0 Download JDK(JDK \ub2e4\uc6b4\ub85c\ub4dc)\u2026<\/i>\ub97c \uc120\ud0dd\ud558\uc5ec \ub2e4\ub978 \ubc84\uc804\uc744 \ub2e4\uc6b4\ub85c\ub4dc\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub2e4\uc6b4\ub85c\ub4dc\ud560 JDK \ubc84\uc804\uc740 \uacf5\uae09\uc5c5\uccb4 \ubaa9\ub85d\uc5d0\uc11c \uc120\ud0dd\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

Modules(\ubaa8\ub4c8) \ud0ed\uc5d0\uc11c \ubaa8\ub4c8\uc5d0 \ub300\ud574 \ub3d9\uc77c\ud55c \uc5b8\uc5b4 \uc218\uc900 \uc989, 20 (Preview) \u2013 Record patterns (second preview), Pattern Matching for switch (fourth preview)(20(\ud14c\uc2a4\ud2b8 \ubc84\uc804) – \ub808\ucf54\ub4dc \ud328\ud134(\ub450 \ubc88\uc9f8 \ud14c\uc2a4\ud2b8 \ubc84\uc804), switch \ud328\ud134 \uc77c\uce58(\ub124 \ubc88\uc9f8 \ud14c\uc2a4\ud2b8 \ubc84\uc804)<\/i>\uac00 \uc120\ud0dd\ub418\uc5c8\ub294\uc9c0 \ud655\uc778\ud569\ub2c8\ub2e4.<\/p>\n

\"\"<\/figure>\n

\uc774\ub807\uac8c \uc120\ud0dd\ud558\uba74 IntelliJ IDEA\uac00 \ub2e4\uc74c \ubc84\uc804\uc5d0\uc11c Java \ud14c\uc2a4\ud2b8 \ubc84\uc804 \uc5b8\uc5b4 \uae30\ub2a5\uc5d0 \ub300\ud55c \uc9c0\uc6d0\uc744 \uc911\ub2e8\ud560 \uc218 \uc788\uc74c\uc744 \uc54c\ub9ac\ub294 \ud31d\uc5c5\uc774 \ud45c\uc2dc\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ud14c\uc2a4\ud2b8 \ubc84\uc804 \uae30\ub2a5\uc740 (\uc544\uc9c1) \uc601\uad6c\uc801\uc774\uc9c0 \uc54a\uc73c\ubbc0\ub85c \ud5a5\ud6c4 Java \ub9b4\ub9ac\uc2a4\uc5d0\uc11c \ubcc0\uacbd(\ub610\ub294 \uc0ad\uc81c)\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4.
Java 19\uc5d0 \ub3c4\uc785\ub41c \ub808\ucf54\ub4dc \ud328\ud134\uc5d0 \ub300\ud574 \uac04\ub2e8\ud788 \ub418\uc9da\uc5b4\ubcf4\ub294 \uac83\uc73c\ub85c \uc2dc\uc791\ud558\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n

\ub808\ucf54\ub4dc \ud328\ud134<\/h2>\n

\ub808\ucf54\ub4dc \uc778\uc2a4\ud134\uc2a4\ub85c \uc218\ud589\ud558\ub824\ub294 \ubd84\uba85\ud55c \uc791\uc5c5\uc740 \ud574\ub2f9 \uad6c\uc131 \uc694\uc18c\uc758 \uac12\uc744 \ucd94\ucd9c\ud558\uc5ec \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \uadf8 \uac12\uc744 \uc0ac\uc6a9\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \ub808\ucf54\ub4dc \ud328\ud134\uc774 \ubc14\ub85c \uadf8\ub7ec\ud55c \uc5ed\ud560\uc744 \ud569\ub2c8\ub2e4.<\/p>\n

\uc6b0\uc120 \ub808\ucf54\ub4dc \ud328\ud134\uc774 \ubb34\uc5c7\uc774\uace0 \uc65c \ud544\uc694\ud55c\uc9c0 \uac04\ub2e8\ud788 \ubcf5\uc2b5\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n

\ub808\ucf54\ub4dc \ud328\ud134 \ube60\ub978 \uc694\uc57d<\/h3>\n

\ub808\ucf54\ub4dc\ub294 \ub370\uc774\ud130\ub97c \ud22c\uba85\ud558\uac8c \uc804\ub2ec\ud560 \uc218 \uc788\ub294 \uac04\ub2e8\ud558\uace0 \uac04\uacb0\ud55c \ubc29\ubc95\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4. \uc774\ub97c \ud1b5\ud574 \uc5ec\ub7ec \uac12(\uad6c\uc131 \uc694\uc18c\ub77c\uace0\ub3c4 \ud568)\uc744 \uc9d1\uacc4\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ud55c\ud3b8, \ub808\ucf54\ub4dc \ud328\ud134\uc740 \ub808\ucf54\ub4dc \uc778\uc2a4\ud134\uc2a4\ub97c \uad6c\uc131 \uc694\uc18c\ub85c \ubd84\ud574\ud558\uc5ec \uad6c\uc131 \uc694\uc18c \uac12\uc744 \uc27d\uac8c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub3c4\ub85d \ud574\uc90d\ub2c8\ub2e4.<\/p>\n

\ub2e4\uc74c \ub808\ucf54\ub4dc\ub97c \uc608\ub85c \ub4e4\uc5b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n

record Name       (String fName, String lName) { }\nrecord PhoneNumber(String areaCode, String number) { }\nrecord Country    (String countryCode, String countryName) { }\nrecord Passenger  (Name name,\n                  PhoneNumber phoneNumber,\n                  Country from,\n                  Country destination) { }<\/pre>\n
\ub2e4\uc74c \ucf54\ub4dc\ub294 \ub808\ucf54\ub4dc \ud328\ud134\uc744 instanceof<\/code> \uc5f0\uc0b0\uc790\uc640 \ud568\uaed8 \uc0ac\uc6a9\ud558\uace0 \uac04\uacb0\ud558\uace0 \uba85\ud655\ud55c \ucf54\ub4dc\ub97c \uc815\uc758\ud558\uc5ec \ub808\ucf54\ub4dc \uc778\uc2a4\ud134\uc2a4\uc758 \uad6c\uc131 \uc694\uc18c\ub97c \ud328\ud134 \ubcc0\uc218 \uc138\ud2b8\ub85c \ubd84\ud574\ud558\ub294 \ubc29\ubc95\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4.<\/p>\n
boolean checkFirstNameAndCountryCodeAgain (Object obj) {\n  if (obj instanceof Passenger(Name (String fName, var lName),\n                               var phoneNumber,\n                               Country from,\n                               Country (var countryCode, String countryName) )) {\n      if (fName != null && countryCode != null) {\n          return fName.startsWith(\"Simo\") && countryCode.equals(\"PRG\");\n      }\n  }\n  return false;\n}<\/pre>\n
\ub808\ucf54\ub4dc \ud328\ud134\uc744 \ucc98\uc74c \uc811\ud55c\ub2e4\uba74 \ub808\ucf54\ub4dc \ud328\ud134\uc5d0 \ub300\ud574 \uc790\uc138\ud788 \ub2e4\ub8ec Java 19\uc640 IntelliJ IDEA<\/a>\ub77c\ub294 \ube14\ub85c\uadf8 \uae00\uc744 \ud655\uc778\ud574 \ubcf4\uc138\uc694. \ub808\ucf54\ub4dc \ud328\ud134\uc774 \ubb34\uc5c7\uc778\uc9c0, \uadf8\ub9ac\uace0 \uc774\ub97c \uc0ac\uc6a9\ud574\uc57c \ud558\ub294 \uc774\uc720\uc640 \ubc29\ubc95\uc774 \uc18c\uac1c\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \uae00\uc5d0\uc11c\ub294 Java 19\uc5d0\uc11c Java 20\uc73c\ub85c \ub118\uc5b4\uc624\uba74\uc11c \ub808\ucf54\ub4dc \ud328\ud134\uc758 \ub2ec\ub77c\uc9c4 \uc810\uc744 \ub2e4\ub8f0 \uac83\uc785\ub2c8\ub2e4.<\/p>\n
Java 20\uc5d0\uc11c\ub294 Java 19\uc5d0 \ucc98\uc74c \ucd94\uac00\ub418\uc5c8\ub358 \uba85\uba85\ub41c \ub808\ucf54\ub4dc \ud328\ud134<\/a>\uc774 \ub354 \uc774\uc0c1 \uc0ac\uc6a9\ub418\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. Java 20\uc5d0\uc11c\ub294 \ub610\ud55c \uc81c\ub124\ub9ad \ub808\ucf54\ub4dc\uc758 \ud0c0\uc785 \uc778\uc218 \ucd94\ub860\uc5d0 \ub300\ud55c \uc9c0\uc6d0\uc774 \uac1c\uc120\ub418\uc5c8\uace0, \ud5a5\uc0c1\ub41c for<\/code> \ub8e8\ud504\uc758 \ud5e4\ub354\uc5d0\uc11c \ub808\ucf54\ub4dc \ud328\ud134\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\ub808\ucf54\ub4dc \uad6c\uc131 \uc694\uc18c\uc758 \ud0c0\uc785 \ucd94\ub860<\/h3>\n
Java 19\ub294 \ub808\ucf54\ub4dc \uad6c\uc131 \uc694\uc18c\uc758 \ucd94\ub860\uc744 \uc9c0\uc6d0\ud588\uc2b5\ub2c8\ub2e4. \uc989, \ub808\ucf54\ub4dc \uad6c\uc131 \uc694\uc18c\uc758 \uba85\uc2dc\uc801 \ud0c0\uc785\uc744 \uc0ac\uc6a9\ud558\ub294 \ub300\uc2e0 var<\/code>\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\uc5c8\uc2b5\ub2c8\ub2e4. \uc774\uc804 \uc139\uc158\uc758 \ub808\ucf54\ub4dc \ud328\ud134\uc5d0 \ub300\ud55c \uc608\ub97c \ub2e4\uc2dc \uc0b4\ud3b4\ubcf4\uace0 var<\/code>\uc758 \uc0ac\uc6a9\ubc95\uc744 \ucc38\uace0\ud558\uc138\uc694.<\/p>\n
boolean checkFirstNameAndCountryCodeAgain (Object obj) {\n  if (obj instanceof Passenger(Name (String fName, var lName),\n                               var phoneNumber,\n                               Country from,\n                               Country (var countryCode, String countryName) )) {\n      if (fName != null && countryCode != null) {\n          return fName.startsWith(\"Simo\") && countryCode.equals(\"PRG\");\n      }\n  }\n  return false;\n}<\/pre>\n
var<\/code>\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc815\uc758\ub41c \ubaa8\ub4e0 \uc9c0\uc5ed \ubcc0\uc218\uc758 \uacbd\uc6b0\uc640 \ub9c8\ucc2c\uac00\uc9c0\ub85c, IntelliJ IDEA\ub294 \uc608\uc57d \ud0a4\uc6cc\ub4dc var<\/code>\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc815\uc758\ub41c \ubcc0\uc218\uc758 \uba85\uc2dc\uc801 \ud0c0\uc785\uc744 \ud45c\uc2dc\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\"\"<\/figure>\n
\uc81c\ub124\ub9ad \ub808\ucf54\ub4dc \ud328\ud134<\/h3>\n
Java 20\uc740 \uc81c\ub124\ub9ad \ub808\ucf54\ub4dc \ud328\ud134\uc758 \ud0c0\uc785 \uc778\uc218 \ucd94\ub860\uc744 \uc9c0\uc6d0\ud569\ub2c8\ub2e4. \uc774\ud574\ud558\uae30 \uc27d\uac8c \uce5c\uad6c\uc5d0\uac8c \ubcf4\ub0b4\uace0 \uc2f6\uc740 \uc190\ubaa9\uc2dc\uacc4\ub098 \ucc45 \uac19\uc740 \uc120\ubb3c\uc758 \uc608\ub97c \ub4e4\uc5b4 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n
\uc81c\ub124\ub9ad \ud074\ub798\uc2a4\uac00 \uc544\ub2cc Book<\/code>\uacfc WristWatch<\/code> \ubc0f \uc81c\ub124\ub9ad \ub808\ucf54\ub4dc\uc778 Gift<\/code>\uc5d0 \ub300\ud574 \ub2e4\uc74c\uacfc \uac19\uc774 \uc815\uc758\ud55c\ub2e4\uace0 \uac00\uc815\ud569\ub2c8\ub2e4.<\/p>\n
class Book {...}\nclass WristWatch {...}\nrecord Gift<T>(T t) {}<\/pre>\n
\uce5c\uad6c\uac00 \uc120\ubb3c\uc744 \ubc1b\uace0 \ud3ec\uc7a5\uc744 \ud480\ub824\uace0 \ud558\uba74 \uc5b4\ub5bb\uac8c \ub420\uae4c\uc694? \uce5c\uad6c\uac00 \uc544\ub798\uc5d0 \uc815\uc758\ub41c \uac83\ucc98\ub7fc unwrap \uba54\uc11c\ub4dc\ub97c \ud638\ucd9c\ud55c\ub2e4\uace0 \uac00\uc815\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \ub2e4\uc74c \ucf54\ub4dc\uc5d0\uc11c unwrap<\/code> \uba54\uc11c\ub4dc\ub294 \ub808\ucf54\ub4dc \ud328\ud134 Gift<wristwatch>(var watch)<\/code>\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \uc774 \ud328\ud134\uc740 \ub808\ucf54\ub4dc \uc774\ub984\uc774 Gift<\/code>\uc778 \uc81c\ub124\ub9ad \ud0c0\uc785 WristWatch<\/code>\ub97c \uc774\ubbf8 \uc9c0\uc815\ud588\uae30 \ub54c\ubb38\uc5d0 \ud328\ud134 \ubcc0\uc218 watch<\/code>\ub294 WristWatch<\/code> \ud0c0\uc785\uc73c\ub85c \ucd94\ub860\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
void unwrap(Gift<wristwatch> obj) {\n   if (obj instanceof Gift<wristwatch> (var watch)) {\n       watch.setAlarm(LocalTime.of(10, 25));\n   }\n}<\/pre>\n
\ub2e4\uc74c \uc608\uc2dc\ub294 Java 19\uc5d0\uc11c \uc791\ub3d9\ud558\uc9c0 \uc54a\uc558\uc9c0\ub9cc Java 20\uc5d0\uc11c\ub294 \ubb38\uc81c \uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n
void unwrapAndRevealSurprise(Gift<WristWatch> obj) {\n    if (obj instanceof Gift<WristWatch> (var watch)) {\n        System.out.println(watch);\n    }\n}\n\nvoid unwrapAndUseGift(Gift<WristWatch> obj) {\n    if (obj instanceof Gift(var gift)) {\n        gift.setAlarmTime(LocalTime.now());\n    }\n}\n\nvoid birthdayGift(Gift<DiamondStudded<WristWatch>> gift) {\n    if (gift instanceof Gift<DiamondStudded<WristWatch>>(DiamondStudded(var personalizedGift))) {\n        System.out.println(personalizedGift);\n    }\n}\n\nvoid performanceBonus(Gift<DiamondStudded<WristWatch>> personalizedGift) {\n    if (personalizedGift instanceof Gift(DiamondStudded(var actualGift))) {\n        System.out.println(\"Wrist watch\" + actualGift);\n    }\n}<\/pre>\n
\ub2e4\uc74c \uc139\uc158\uc5d0\uc11c\ub294 \uc774\ub7ec\ud55c \ubcc0\ud654\ub85c \uc778\ud574 \uc804\uccb4 switch \ubb38\uc758 \uc791\ub3d9\uc774 \uc5b4\ub5bb\uac8c \ub2ec\ub77c\uc9c0\ub294\uc9c0 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n
\uc81c\ub124\ub9ad \ub808\ucf54\ub4dc\uac00 \ud3ec\ud568\ub41c \uc804\uccb4 switch \ubb38<\/h3>\n
\uc2dc\uc791\ud558\uae30 \uc804\uc5d0 \uae30\ubcf8\uc801\uc778 \ub0b4\uc6a9\ubd80\ud130 \uc9da\uace0 \ub118\uc5b4\uac00\uaca0\uc2b5\ub2c8\ub2e4. \ub2e4\uc74c \uc774\ubbf8\uc9c0\ub294 switch \ubb38 \ub610\ub294 switch \uc2dd(switch \ubb38\uc5d0 \uc804\ub2ec\ud558\ub294 \ubcc0\uc218 \ub610\ub294 \uc2dd)\uc5d0\uc11c \uc120\ud0dd\uc790 \ud45c\ud604\uc2dd\uc774 \ucc38\uc870\ud558\ub294 \ub0b4\uc6a9\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4.<\/p>\n
\"\"<\/figure>\n
switch \ubb38 \ubc0f switch \uc2dd\uc758 \uad6c\ubb38\uc740 \uc120\ud0dd\uc790 \uc2dd\uc758 \uac12\uc744 \ud574\ub2f9 case \ub77c\ubca8\uc758 \ud0c0\uc785 \ud328\ud134 \ub610\ub294 \ub808\ucf54\ub4dc \ud328\ud134\uacfc \uc77c\uce58\uc2dc\ud0a4\ub824\uace0 \ud560 \ub54c \ud3ec\uad04\uc801\uc774\uc5b4\uc57c \ud569\ub2c8\ub2e4. \uc989, \uc120\ud0dd\uc790 \uc2dd\uc740 case \ub77c\ubca8\uc5d0 \uc815\uc758\ub41c \uac12 \uc911 \ucd5c\uc18c \ud558\ub098\uc640 \uc77c\uce58\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n
Object<\/code> \ud0c0\uc785\uacfc \uac19\uc774 \ud558\uc704 \ud0c0\uc785\uc758 \uba85\ud655\ud55c \uac1c\uc218(\ud655\uc7a5\ud558\ub294 \ub2e4\ub978 \ud074\ub798\uc2a4\uc758 \uace0\uc815 \uac1c\uc218)\uac00 \uc5c6\ub294 \ud0c0\uc785\uc758 \uacbd\uc6b0, default<\/code> case \ub77c\ubca8 \ub610\ub294 Object<\/code> \ud0c0\uc785 \uc790\uccb4\ub97c case \ub77c\ubca8 \uc911 \ud558\ub098\ub85c \uc815\uc758\ud558\uc5ec \uc644\uc804\ud55c switch \ubb38\uc73c\ub85c \ub9cc\ub4e4 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \uc644\uc804\ud55c switch \uc2dd \ubc0f switch \ubb38\uc744 \uc798 \ubcf4\uc5ec\uc8fc\ub294 \uc608\uc785\ub2c8\ub2e4.<\/p>\n
String exhaustiveSwitchExpression(Object obj) {\n   return switch (obj) {\n       case String s -> \"String\";\n       case Apple apple -> \"Apple\";\n       default -> \"everything else\";\n   };\n}\n\nvoid exhaustiveSwitchStatement(Object obj) {\n   switch (obj) {\n       case String s -> System.out.println(\"String\");\n       case Apple apple -> System.out.println(\"Apple\");\n       case Object object -> System.out.println(\"everything else\");\n   };\n}<\/pre>\n
sealed \ud074\ub798\uc2a4\uc640 \uac19\uc740 \uc77c\ubd80 \ud0c0\uc785\uc5d0\ub294 \ud655\uc815\uc801\uc778 \ud558\uc704 \ud0c0\uc785\uc774 \uc788\uc73c\ubbc0\ub85c \uc644\uc804\ud55c switch \ubb38\uc774\ub098 switch \uc2dd\uc744 \uc815\uc758\ud558\uae30 \uc704\ud574 default<\/code> \ub77c\ubca8\uc774 \ud544\uc694\ud558\uc9c0 \uc54a\uc744 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uba74 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n
sealed interface HighProtein permits Egg, Cheese {}\nfinal class Egg implements HighProtein {}\nfinal class Cheese implements HighProtein {}\n \nint processHighProtein(HighProtein protein) {\n   return switch (protein) {\n       case Egg egg -> 2;\n       case Cheese cheese -> 10;\n   };\n}<\/pre>\n
\uadf8\ub7ec\ub098 HighProtein<\/code> \uc778\ud130\ud398\uc774\uc2a4\ub97c \uc77c\ubc18 \uc778\ud130\ud398\uc774\uc2a4, \uc989 sealed\uac00 \uc544\ub2cc \uc778\ud130\ud398\uc774\uc2a4\ub85c \uc815\uc758\ud558\uba74 \uc774\uc804 \ucf54\ub4dc\ub97c \ucef4\ud30c\uc77c\ub9c1\ud558\ub294 \ub370 \ubb38\uc81c\uac00 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\uc774\uc81c \uc120\ud0dd\uc790 \uc2dd\uc774 \ub808\ucf54\ub4dc \ud328\ud134\uacfc \uc77c\uce58\ud558\ub294 \uc81c\ub124\ub9ad \ub808\ucf54\ub4dc\uc778 \uacbd\uc6b0, \uc644\uc804\ud55c case \ub77c\ubca8\uc744 \uc815\uc758\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uc774\uc57c\uae30\ud558\uaca0\uc2b5\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \ub610 \ub2e4\ub978 \ud074\ub798\uc2a4\uc778 HimalayanApple<\/code>\uc5d0 \uc758\ud574 \ud655\uc7a5\ub418\ub294 \uc81c\ub124\ub9ad \ud074\ub798\uc2a4 Apple<\/code>, Egg<\/code> \ubc0f Cheese<\/code> \ud074\ub798\uc2a4\uc5d0 \uc758\ud574 \uad6c\ud604\ub41c sealed \uc778\ud130\ud398\uc774\uc2a4\uc778 HighProtein<\/code>, \uadf8\ub9ac\uace0 \ud0c0\uc785 \ub9e4\uac1c\ubcc0\uc218\ub97c \ucde8\ud558\uace0 \uc774 \ud0c0\uc785\uc758 \ub450 \uad6c\uc131 \uc694\uc18c\ub97c \uc815\uc758\ud558\ub294 \uc81c\ub124\ub9ad \ub808\ucf54\ub4dc\uc778 Dish<\/code>\uc758 \uc608\uc785\ub2c8\ub2e4.<\/p>\n
public class Apple {}\npublic class HimalayanApple extends Apple{}\n\nsealed public interface HighProtein permits Egg, Cheese {}\npublic final class Egg implements HighProtein {}\npublic final class Cheese implements HighProtein {}\n\npublic record Dish<T> (T x, T y){}<\/pre>\n
\uc774 \uc81c\ub124\ub9ad \ub808\ucf54\ub4dc \ud074\ub798\uc2a4 Dish<\/code>\uc758 \uc778\uc2a4\ud134\uc2a4\ub97c \uc804\ud658\ud560 \ub54c \uc791\ub3d9\ud558\uac70\ub098 \uc791\ub3d9\ud558\uc9c0 \uc54a\ub294 \uc5ec\ub7ec \uc870\ud569\uc5d0 \ub300\ud574 \uc774\uc57c\uae30\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n
Dish<Apple> appleDish<\/code> \ud0c0\uc785\uc758 \uba54\uc11c\ub4dc \ub9e4\uac1c\ubcc0\uc218\ub97c \ucde8\ud558\uace0 \uc774\ub97c \uc804\ud658\ud558\uc5ec \ub808\ucf54\ub4dc \ud328\ud134\uacfc \uc77c\uce58\uc2dc\ud0a4\ub294 orderAppleDish<\/code> \uba54\uc11c\ub4dc\uc778 orderAppleDish\ubd80\ud130 \uc2dc\uc791\ud558\uaca0\uc2b5\ub2c8\ub2e4. \ub2e4\uc74c \ucf54\ub4dc\uac00 \ubb38\uc81c \uc5c6\ub2e4\uace0 \uc0dd\uac01\ud558\uc2dc\ub098\uc694?<\/p>\n
    int orderAppleDish(Dish<Apple> appleDish) {\n        return switch (appleDish) {\n            case Dish<Apple>(Apple apple, HimalayanApple himalayanApple) -> 1;\n            case Dish<Apple>(HimalayanApple himalayanApple, Apple apple) -> 2;\n        };\n    }<\/pre>\n
HimalayanApple<\/code> \ud074\ub798\uc2a4\ub294 Apple<\/code> \ud074\ub798\uc2a4\ub97c \ud655\uc7a5\ud558\ubbc0\ub85c \uc55e\uc758 switch \uc2dd\uc744 \uc644\uc804\ud55c switch\ub85c \ub9cc\ub4e4\ub824\uba74 \ub2e4\uc74c \ub450 \uac00\uc9c0 \uc870\ud569\uc774 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n
Apple, Apple
HimalayanApple, HimalayanApple<\/p>\n
\ub2e4\uc74c gif\ub294 IntelliJ IDEA\uac00 \uc774\uc804 \ucf54\ub4dc\uc5d0 \ubb38\uc81c\uac00 \uc788\uc74c\uc744 \uac10\uc9c0\ud558\uace0 \ucf54\ub4dc\ub97c \ub418\uc9da\uc73c\uba74\uc11c \uc624\ub958\ub97c \uc218\uc815\ud558\ub3c4\ub85d \ub3c4\uc6c0\uc744 \uc8fc\ub294 \uacfc\uc815\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4.<\/p>\n
\"\"<\/figure>\n
\ub2e4\uc74c\uc740 \ucc38\uace0\uc6a9\uc73c\ub85c \uc81c\uc2dc\ub41c \uc774\uc804 gif\uc758 \ucd5c\uc885 \ucf54\ub4dc\uc785\ub2c8\ub2e4.<\/p>\n
class Apple {}\nclass HimalayanApple extends Apple{}\nrecord Dish<T> (T ingredient1, T ingredient2) {}\n\npublic class FoodOrder {\n\n    int orderAppleDish(Dish<Apple> appleDish) {\n        return switch (appleDish) {\n            case Dish<Apple>(HimalayanApple apple1, HimalayanApple apple2) -> 4;\n            case Dish<Apple>(Apple apple, HimalayanApple himalayanApple) -> 1;\n            case Dish<Apple>(HimalayanApple himalayanApple, Apple apple) -> 2;\n            case Dish<Apple>(Apple apple1, Apple apple2) -> 3;\n        };\n    }\n\n}<\/pre>\n
\uc81c\ub124\ub9ad \ub808\ucf54\ub4dc\uc778 Dish<\/code>\uc5d0\uc11c \ub2e4\uc74c\uc758 sealed \uc778\ud130\ud398\uc774\uc2a4\uc640 \uad6c\ud604\uc744 \uc0ac\uc6a9\ud558\ub294 \ub610 \ub2e4\ub978 \uc608\ub97c \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n
sealed public interface HighProtein permits Egg, Cheese {}\npublic final class Egg implements HighProtein {}\npublic final class Cheese implements HighProtein {}\n\npublic record Dish<T> (T x, T y){}<\/pre>\n
\uc5b4\ub5a4 \uc0ac\ub78c\uc774 \uc74c\uc2dd\uc744 \uc8fc\ubb38\ud558\uace0 HighProtein<\/code> \uc778\ud130\ud398\uc774\uc2a4\ub97c \ud0c0\uc785 \ub9e4\uac1c\ubcc0\uc218\ub85c \uc0ac\uc6a9\ud558\uc5ec Dish<\/code> \uc778\uc2a4\ud134\uc2a4\ub97c \uc804\ub2ec\ud55c\ub2e4\uace0 \uac00\uc815\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc774 \uacbd\uc6b0 \ub2e4\uc74c switch \uc2dd\uc740 \uc644\uc804\ud569\ub2c8\ub2e4.<\/p>\n
\"\"<\/figure>\n
\uc544\ub798 \ucf54\ub4dc\ub97c \ucc38\uace0\ud558\uc138\uc694.<\/p>\n
public class FoodOrder {\n\n    int orderHighProteinDish(Dish<HighProtein> proteinDish) {\n        return switch (proteinDish) {\n            case Dish<HighProtein>(HighProtein protein, Egg egg) -> 1;\n            case Dish<HighProtein>(HighProtein protein, Cheese cheese) -> 2;\n        };\n    }\n\n}<\/pre>\n
HighProtein<\/code>\uc740 sealed \uc778\ud130\ud398\uc774\uc2a4\uc774\ubbc0\ub85c \ub2e4\uc74c switch \ubb38\uc758 \uccab \ubc88\uc9f8 case \ub77c\ubca8\uc740 Egg<\/code> \ub610\ub294 Cheese<\/code>\ub97c \ub808\ucf54\ub4dc Dish\uc5d0 \ub450 \ubc88\uc9f8 \uac12\uc73c\ub85c \uc804\ub2ec\ud558\ub294 \uacbd\uc6b0\ub97c \ud3ec\uad04\ud569\ub2c8\ub2e4. \ub530\ub77c\uc11c \uc138 \uac1c\uc758 case \ub77c\ubca8\ub9cc \uc815\uc758\ud558\uace0 \uc788\uc9c0\ub9cc \uc644\uc804\ud55c switch \uc2dd\uc785\ub2c8\ub2e4.<\/p>\n
public class FoodOrder {\n\n    int orderHighProteinDish(Dish<HighProtein> proteinDish) {\n        return switch (proteinDish) {\n            case Dish<HighProtein>(Egg protein, HighProtein highProtein) -> 1;\n            case Dish<HighProtein>(Cheese cheese, Egg egg) -> 2;\n            case Dish<HighProtein>(Cheese cheese1, Cheese cheese2) -> 4;\n        };\n    }\n\n}<\/pre>\n
\uc644\uc804\ud55c switch \ubc0f \uc81c\ub124\ub9ad \ub808\ucf54\ub4dc\uc5d0 \ub300\ud55c \uc774 \ub9c8\uc9c0\ub9c9 \uc608\uc5d0\uc11c switch \ud45c\ud604\uc2dd\uc758 \ub2e4\uc74c \ucd08\uae30 case \ub77c\ubca8 \uc138\ud2b8\ub294 \uc644\uc804\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \uccab \ubc88\uc9f8 \uc7ac\ub8cc\uac00 HighProtein<\/code>\uc758 \uc778\uc2a4\ud134\uc2a4\uc774\uace0 \ub450 \ubc88\uc9f8 \uac12\uc774 Egg<\/code>\uc758 \uc778\uc2a4\ud134\uc2a4\uc778 \uace0\ub2e8\ubc31 \uc694\ub9ac\ub97c \ucc98\ub9ac\ud560 \uac00\ub2a5\uc131\uc744 \ud3ec\ud568\ud558\uc9c0 \uc54a\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4.<\/p>\n
    int orderHighProteinDish(Dish<HighProtein> proteinDish) {\n        return switch (proteinDish) {\n            case Dish<HighProtein>(Egg protein, Cheese cheese) -> 1;\n            case Dish<HighProtein>(Cheese cheese, Egg egg) -> 2;\n            case Dish<HighProtein>(HighProtein highProtein, Cheese cheese) -> 3;\n        };\n    }\n<\/pre>\n
\uc774\uc804 \ucf54\ub4dc\uc5d0 \ub610 \ub2e4\ub978 case \ub77c\ubca8\uc744 \ucd94\uac00\ud558\uc5ec \uc644\uc804\ud55c switch \uc2dd\uc73c\ub85c \ub9cc\ub4e4\uc5b4 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n
            case Dish<HighProtein>(HighProtein highProtein, Egg egg) -> 10;<\/pre>\n
\ud5a5\uc0c1\ub41c for \uad6c\ubb38\uacfc \ud568\uaed8 \ub808\ucf54\ub4dc \ud328\ud134 \uc0ac\uc6a9<\/h3>\n
Java 20\uc5d0\uc11c\ub294 \ud5a5\uc0c1\ub41c for<\/code> \ub8e8\ud504\uc758 \ud5e4\ub354\uc5d0\uc11c \ub808\ucf54\ub4dc \ud328\ud134\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uadf8\ub7ec\ub098 \uc5ec\ub7ec case \ub77c\ubca8\uc744 \ud560\ub2f9\ud560 \uc218 \uc788\ub294 switch \ubb38 \ub610\ub294 \uc2dd, \ud5a5\uc0c1\ub41c for \ub8e8\ud504 \ud5e4\ub354\uc5d0\uc11c \uc0ac\uc6a9\ud558\ub294 \ub2e8\uc77c \ub808\ucf54\ub4dc \ud328\ud134\uc740 for \ub8e8\ud504\uc5d0\uc11c \ubc18\ubcf5\ud558\ub294 \ubaa8\ub4e0 \uac12\uacfc \uc77c\uce58\ud574\uc57c \ud569\ub2c8\ub2e4. \uadf8\ub807\uc9c0 \uc54a\uc73c\uba74 \ucf54\ub4dc\uc5d0\uc11c \ub7f0\ud0c0\uc784 \uc608\uc678\uac00 \ubc1c\uc0dd\ud569\ub2c8\ub2e4.<\/p>\n
\ub2e4\uc74c\uc740 \ub808\ucf54\ub4dc Point<\/code> \ubc0f Triangle<\/code>\uacfc \ud5e4\ub354\uc5d0\uc11c \ub808\ucf54\ub4dc \ud328\ud134\uc744 \uc0ac\uc6a9\ud558\uc5ec Triangle<\/code> \uc778\uc2a4\ud134\uc2a4 \ubaa9\ub85d\uc744 \ubc18\ubcf5 \ucc98\ub9ac\ud558\ub294 \ud5a5\uc0c1\ub41c for \ub8e8\ud504\uc758 \uc608\uc785\ub2c8\ub2e4.<\/p>\n
record Point (int x, int y) { }\nrecord Triangle(Point pointA, Point pointB, Point PointC) { }\n\nlong addLowerRightCoordinates(List<Triangle> triangles) {\n    long sum = 0;\n    for (Triangle(Point a, Point b, Point (int x, int y)) : triangles) {\n        sum += x + y;\n    }\n    return sum;\n}<\/pre>\n
\ub2e4\uc74c\uc740 \uc77c\ubd80 \uc798\ubabb\ub41c \uc608\uc785\ub2c8\ub2e4.<\/p>\n
public class Test {\n\n    sealed interface UpperWithPermit permits PermittedRecord {}\n    record PermittedRecord(int x) implements UpperWithPermit {}\n    interface Upper {}\n    record Record(List<String> x) implements Upper {}\n\n    void test1(List<Upper> lists) {\n        for (Record(List<String> x) : lists) {} \n    }\n\n    void test2(List<? super UpperWithPermit> lists) {\n        for (PermittedRecord(var x) : lists) {} \n    }\n\n    void test3(List<? super PermittedRecord> lists) {\n        for (PermittedRecord(var x) : lists) {} \n    }\n\n    void test4(List lists) {\n        for (PermittedRecord(var x) : lists) {} \n    }\n\n    void test5(List<?> lists) {\n        for (PermittedRecord(var x) : lists) {} \n    }\n}<\/pre>\n
switch \ud328\ud134 \uc77c\uce58<\/h2>\n
Java 20\uc5d0\uc11c switch\uc758 \ud328\ud134 \uc77c\uce58\ub294 \ub124 \ubc88\uc9f8 \ud14c\uc2a4\ud2b8 \ubc84\uc804\uc785\ub2c8\ub2e4. \ud328\ud134 \uc77c\uce58\uac00 \ucc98\uc74c\uc774\ub77c\uba74 \uc774 \ub9c1\ud06c<\/a>\uc5d0\uc11c instanceof\ub97c \ud1b5\ud574 \ud328\ud134 \uc77c\uce58\uc5d0 \ub300\ud55c \uae30\ucd08\uc801\uc778 \ub0b4\uc6a9\uc744 \uc54c\uc544\ubcf4\uc2dc\uae30 \ubc14\ub78d\ub2c8\ub2e4. switch\ub97c \uc774\uc6a9\ud55c \ud328\ud134 \uc77c\uce58\uac00 \uc0dd\uc18c\ud55c \ubd84\ub4e4\uc740 \uc774 \ub9c1\ud06c<\/a>\ub97c \ud655\uc778\ud558\uc138\uc694.<\/p>\n
Java 20\uc5d0\uc11c \uc774 \uae30\ub2a5\uc5d0 \uba87 \uac00\uc9c0 \ubcc0\uacbd \uc0ac\ud56d\uc774 \ucd94\uac00\ub418\uc5c8\uc2b5\ub2c8\ub2e4. \uc5f4\uac70\ud615 \ud074\ub798\uc2a4\uc640 \ud568\uaed8 \uc0ac\uc6a9\ud560 \ub54c switch \ud328\ud134 \uc77c\uce58\ub294 \uc774\uc81c \uc644\uc804\ud55c switch \ubb38 \ub610\ub294 switch \uc2dd\uc5d0\uc11c \ub7f0\ud0c0\uc784\uc5d0 \uc77c\uce58\ud558\ub294 \ub77c\ubca8\uc744 \ucc3e\uc744 \uc218 \uc5c6\ub294 \uacbd\uc6b0, ImcompatibleClassChangeError<\/code>\ub97c \ubc1c\uc0dd\uc2dc\ud0a4\ub294 \ub300\uc2e0 MatchException<\/code>\uc744 \ubc1c\uc0dd\uc2dc\ud0b5\ub2c8\ub2e4. Java 20\uc5d0\uc11c \uc774 \uae30\ub2a5\uc758 \ub610 \ub2e4\ub978 \ubcc0\uacbd \uc0ac\ud56d\uc740 case \ub77c\ubca8\uc758 \uc81c\ub124\ub9ad \ub808\ucf54\ub4dc \ud328\ud134\uc5d0 \ub300\ud55c \ud0c0\uc785 \ub9e4\uac1c\ubcc0\uc218 \ucd94\ub860\uacfc \uad00\ub828\uc774 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \uae30\ub2a5\uc740 \uc774 \ube14\ub85c\uadf8 \uae00\uc758 \uc81c\ub124\ub9ad \ub808\ucf54\ub4dc\uac00 \ud3ec\ud568\ub41c \uc804\uccb4 switch \ubb38<\/a> \uc139\uc158\uc5d0\uc11c \uc774\ubbf8 \ub2e4\ub8e8\uc5c8\uc2b5\ub2c8\ub2e4.<\/p>\n
\uc694\uc57d<\/h2>\n
IntelliJ IDEA\ub294 \uac1c\ubc1c\uc790\uac00 \ucd5c\uc2e0 Java \uae30\ub2a5\uc744 \uc0ac\uc6a9\ud558\ub294 \uacfc\uc815\uc5d0\uc11c \uc778\uc9c0 \ubd80\ud558\ub97c \uc9c0\uc18d\uc801\uc73c\ub85c \uc904\uc5ec\uc90d\ub2c8\ub2e4. IntelliJ IDEA 2023.1\uc740 Java 20\uc5d0\uc11c ‘switch \ud328\ud134 \uc77c\uce58’ \ubc0f ‘\ub808\ucf54\ub4dc \ud328\ud134’\uacfc \uac19\uc740 \uc5b8\uc5b4 \uae30\ub2a5\uc5d0 \ucd94\uac00\ub41c \ubcc0\uacbd \uc0ac\ud56d\uc744 \uc9c0\uc6d0\ud569\ub2c8\ub2e4. \uc774\ub7ec\ud55c \uae30\ub2a5\uc5d0\uc11c \uac00\uc7a5 \ud765\ubbf8\ub85c\uc6b4 \ubcc0\uacbd \uc0ac\ud56d\uc740 \uac15\ud654\ub41c for \ud5e4\ub354\uc5d0\uc11c \ub808\ucf54\ub4dc \ud328\ud134\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4\ub294 \uc810\uacfc \uc81c\ub124\ub9ad \ub808\ucf54\ub4dc \ud328\ud134\uc5d0 \ub300\ud55c \ud0c0\uc785 \uc778\uc218\uc758 \ud0c0\uc785 \ucd94\ub860\uc774 \uac1c\uc120\ub418\uc5c8\ub2e4\ub294 \uc810\uc785\ub2c8\ub2e4.<\/p>\n
\uc990\uac81\uac8c \ucf54\ub529\ud558\uc138\uc694.<\/p>\n
\uac8c\uc2dc\ubb3c \uc6d0\ubb38 \uc791\uc131\uc790<\/em><\/p>\n\n    
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\n                                                        <\/div>\n            <\/div>\n        <\/div>\n    <\/div>\n","protected":false},"author":964,"featured_media":344383,"comment_status":"closed","ping_status":"closed","template":"","categories":[5088],"tags":[8095,6744,8097,8099,155,76,477],"cross-post-tag":[],"acf":[],"_links":{"self":[{"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/idea\/344381"}],"collection":[{"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/idea"}],"about":[{"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/types\/idea"}],"author":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/users\/964"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/comments?post=344381"}],"version-history":[{"count":5,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/idea\/344381\/revisions"}],"predecessor-version":[{"id":344408,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/idea\/344381\/revisions\/344408"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/media\/344383"}],"wp:attachment":[{"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/media?parent=344381"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/categories?post=344381"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/tags?post=344381"},{"taxonomy":"cross-post-tag","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/cross-post-tag?post=344381"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}