{"id":34071,"date":"2020-05-25T10:36:13","date_gmt":"2020-05-25T01:36:13","guid":{"rendered":"https:\/\/blog.jetbrains.com\/kr\/?p=817"},"modified":"2021-03-09T10:50:58","modified_gmt":"2021-03-09T09:50:58","slug":"25-things-we-love-about-java-ko","status":"publish","type":"post","link":"https:\/\/blog.jetbrains.com\/ko\/2020\/05\/25\/25-things-we-love-about-java-ko\/","title":{"rendered":"JetBrains\uac00 \uc0ac\ub791\ud558\ub294 Java\uc758 25\uac00\uc9c0 \ud2b9\uc9d5"},"content":{"rendered":"JetBrains\ub294 \ubaa8\ub4e0 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc640 \ubaa8\ub4e0 \uac1c\ubc1c\uc790\ub97c \uc0ac\ub791\ud569\ub2c8\ub2e4. \uc774\ubc88 \ub2ec 2020\ub144 5\uc6d4\uc5d0\ub294 Java\uac00 25\uc8fc\ub144\uc744 \ub9de\uc2b5\ub2c8\ub2e4! \uadf8\ub798\uc11c \ud2b9\ubcc4\ud788 Java\uc5d0 \ucd08\uc810\uc744 \ub9de\ucdb0 JetBrains\uac00 \uc0ac\ub791\ud558\ub294 Java \ubc0f JVM\uc758 25\uac00\uc9c0 \ud2b9\uc9d5\uc744 \uc0b4\ud3b4\ubcf4\ub824 \ud569\ub2c8\ub2e4.\n\n\n\uc774\uc804 \ubc84\uc804\uacfc\uc758 \ud638\ud658\uc131\nJava\ub294 25\ub144 \uc804\uc758 \ucf54\ub4dc\ub97c \ucd5c\uc2e0 \ubc84\uc804\uc758 Java\uc5d0\uc11c\ub3c4 \uc2e4\ud589\ud560 \uc218 \uc788\ub2e4\ub294 \uc810\uc5d0\uc11c \uac70\uc758 \ub3c5\ubcf4\uc801\uc785\ub2c8\ub2e4. \uc5b8\uc5b4 \uac1c\ubc1c\uc790\ub294 \uc774\uc804 \ubc84\uc804\uacfc\uc758 \ud638\ud658\uc131\uc744 \ub9e4\uc6b0 \uc911\uc694\ud558\uac8c \uc0dd\uac01\ud558\uae30\uc5d0 \uc218\ub9ce\uc740 \uc870\uc9c1\uc5d0\uc11c \uba87\ub144\uc774 \uc9c0\ub09c \ucf54\ub4dc\ub77c\ub3c4 JVM\uc5d0\uc11c \uc2e4\ud589\ub41c\ub2e4\ub294 \uc810\uc744 \uace0\ub824\ud574 Java\ub97c \uae30\ubcf8 \uac1c\ubc1c \ud50c\ub7ab\ud3fc\uc73c\ub85c \uc801\uadf9 \uc218\uc6a9\ud588\uc2b5\ub2c8\ub2e4.\n\uc131\uc219\ub3c4\n\uc624\ub79c \uc2dc\uac04\uc774 \uc9c0\ub09c \ub9cc\ud07c \uc774\uc810\ub3c4 \ub9ce\uc2b5\ub2c8\ub2e4. \uc9c0\ub09c 25\ub144 \ub3d9\uc548 \uac1c\ubc1c\uc790\ub4e4\uc740 \ub2e4\uc591\ud55c \uc5c5\uacc4 \ubc0f \ube44\uc988\ub2c8\uc2a4 \uc720\ud615\uacfc \ub2e4\uc591\ud55c \ud50c\ub7ab\ud3fc\uc5d0\uc11c Java\ub85c \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uc791\uc131\ud574\uc654\uc2b5\ub2c8\ub2e4. \ub610\ud55c, 25\ub144 \ub3d9\uc548 \uac1c\ubc1c\uc790\ub4e4\uc740 \ud559\uad50, \ub300\ud559, \ubd80\ud2b8\ucea0\ud504, \uc9c1\uc7a5\uc5d0\uc11c Java\ub97c \ubc30\uc6cc \uc654\uc2b5\ub2c8\ub2e4. \uc774\ub97c \ud1b5\ud574 \uc2dc\uac04\uc758 \ud750\ub984\uc5d0 \ub530\ub77c \uacbd\ud5d8\uc5d0\uc11c \uc9c0\uc2dd\uc744 \ucd95\uc801\ud558\uace0 \uacc4\uc18d \uc131\uc7a5\ud558\ub294 \uac70\ub300\ud55c \uc5d0\ucf54\uc2dc\uc2a4\ud15c\uc774 \ud615\uc131\ub418\uc5c8\uc2b5\ub2c8\ub2e4. Java \ubc0f Java\ub85c \ud574\uacb0 \uac00\ub2a5\ud55c \ubb38\uc81c\uc5d0 \uad00\ud574\uc11c\ub294 \uacf5\uae09\uc5c5\uccb4\uc640 \ube44\uc601\ub9ac\ub2e8\uccb4, \uac1c\uc778\ub4e4\uc774 \uc790\uc138\ud788 \ubb38\uc11c\ud654\ud558\uace0 \uc9c0\uc6d0\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4.  \ubb34\uc5c7\ubcf4\ub2e4 \uc6b0\ub9ac \uac19\uc740 \uac1c\ubc1c\uc790\uc5d0\uac8c \ub9e4\uc6b0 \uc911\uc694\ud55c \uc774\uc810\uc740 Java\uac00 \uc131\uc219\ud558\uace0 \ud3ed\ub113\uac8c \ucc44\ud0dd\ub418\uba74\uc11c Java\ub85c \ucf54\ub529\ud558\ub824\ub294 \uac1c\ubc1c\uc790\uc5d0\uac8c \uc218\ub9ce\uc740 \uc77c\uac70\ub9ac\uac00 \uc0dd\uae34\ub2e4\ub294 \uac83\uc785\ub2c8\ub2e4!\n\uc9c0\uc18d\uc801 \uac1c\uc120\n\uc774\uc804 \ubc84\uc804\uacfc\uc758 \ud638\ud658\uc131 \ubc0f \uc131\uc219\ub3c4\uc640 \ub300\ube44\ub418\ub294 \ud2b9\uc9d5\uc740 \ud50c\ub7ab\ud3fc\uacfc \uc5b8\uc5b4\uc758 \ubc1c\uc804\uc785\ub2c8\ub2e4. Java\ub294 2017\ub144(Java 9)\ubd80\ud130 6\uac1c\uc6d4\ub9c8\ub2e4 \uc0c8\ub85c\uc6b4 \ubc84\uc804\uc774 \ucd9c\uc2dc\ub418\uc5b4 \uafb8\uc900\ud788 \ubcc0\uacbd\ub418\uace0 \uac1c\uc120\ub418\uc5b4 \uc654\uc2b5\ub2c8\ub2e4. \ud14c\uc2a4\ud2b8 \ubc84\uc804 \uae30\ub2a5\uc744 \uacb0\ud569\ud558\uc5ec \uc0c8\ub85c\uc6b4 \uad6c\ubb38\uc744 \uc2e4\ud5d8\ud558\uace0 \uac1c\ubc1c\uc790\ub85c\ubd80\ud130 \ud53c\ub4dc\ubc31\uc744 \ubc1b\uc740 \ub2e4\uc74c, Java \uc0ac\uc6a9\uc790\ub4e4\uc744 \uc704\ud55c \uc2e4\uc6a9\ud654\ub41c \uc0c8\ub85c\uc6b4 \uae30\ub2a5\uc744 \ud45c\uc900\ud654\ud569\ub2c8\ub2e4.\n\uade0\ud615\uc131\nJava\ub294 \uc774\uc804 \ubc84\uc804\uacfc\uc758 \ud638\ud658\uc131\uacfc \ubbf8\ub798 \uc0ac\uc774\uc5d0\uc11c \uae4c\ub2e4\ub85c\uc6b4 \uade0\ud615\uc744 \ub9de\ucdb0\uc57c \ud569\ub2c8\ub2e4. \uc774\uc804 \ubc84\uc804\uacfc\uc758 \ud638\ud658\uc131\uc744 \ud3c9\uac00\ud558\uace0 6\uac1c\uc6d4\ub9c8\ub2e4 \ucd9c\uc2dc\ud558\ub294 \ud604\uc7ac\uc758 \uc811\uadfc \ubc29\uc2dd\uc740 3\ub144\ub9c8\ub2e4 \ucd9c\uc2dc\ub418\ub294 \uc7a5\uae30\uc801 \uc9c0\uc6d0\uacfc \uacb0\ud569\ub418\uc5b4 \uade0\ud615\uc744 \uc801\uc808\ud788 \ub9de\ucd94\uace0 \uc788\ub294 \ub4ef \ubcf4\uc785\ub2c8\ub2e4. Java\ub294 \uc81c\uac70\ub420 \uc608\uc815\uc778 \uc0ac\uc6a9 \uc911\ub2e8 \uae30\ub2a5\uc5d0 \ub300\ud55c \uacbd\uace0\ub97c \uc81c\uacf5\ud558\uace0 \uc5c6\uc5b4\uc9c8 \uc218 \uc788\ub294 \ud56d\ubaa9\uc758 \ub300\uccb4 \uae30\ub2a5\uc744 \ub9c8\ub828\ud558\uc5ec \ubc1c\uc804\ud569\ub2c8\ub2e4.\n\ub192\uc740 \uc548\uc815\uc131\uc744 \uc6d0\ud558\ub294 \uc0ac\ub78c\uc740 \uc7a5\uae30\uc801 \uc9c0\uc6d0 \ub9b4\ub9ac\uc2a4\ub97c \uacc4\uc18d \uc0ac\uc6a9\ud558\uba74 \ub429\ub2c8\ub2e4. \uc5c5\uadf8\ub808\uc774\ub4dc \uc2dc\uae30\uac00 \ub418\uc5c8\uc744 \ub54c \uc704\ud5d8\uc744 \uc904\uc774\ub824\uba74 6\uac1c\uc6d4\ub9c8\ub2e4 \ucd9c\uc2dc\ub418\ub294 \ub9b4\ub9ac\uc2a4\ub97c \uc815\uae30\uc801\uc73c\ub85c \ud14c\uc2a4\ud2b8\ud560 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4. 6\uac1c\uc6d4\ub9c8\ub2e4 \uc5c5\uadf8\ub808\uc774\ub4dc\ud558\ub294 \uac83\uc774 \uc88b\uc740 \uc0ac\ub78c\uc740 \ub9b4\ub9ac\uc2a4\uac00 \ub098\uc62c \ub54c\ub9c8\ub2e4 \ucd5c\uc2e0 Java \ubc84\uc804\uc73c\ub85c \uc5c5\ub370\uc774\ud2b8\ud558\uba74 \ub429\ub2c8\ub2e4. \uc0c8\ub85c\uc6b4 \uad6c\ubb38\uc774 \ud45c\uc900\ud654\ub418\uae30 \uc804\uc5d0 \uc0ac\uc6a9\ud574 \ubcf4\uace0 \uc2f6\uc740 \uac1c\ubc1c\uc790\ub294 \ud14c\uc2a4\ud2b8 \ubc84\uc804 \uae30\ub2a5\uc744 \ud65c\uc131\ud654\ud560 \uc218 \uc788\uc73c\uba70, \ucd5c\ub300\ud55c \ube68\ub9ac \uccb4\ud5d8\ud574 \ubcf4\uace0 \uc2f6\uc740 \uac1c\ubc1c\uc790\ub294 \uc0c8 \uad6c\ubb38\uc774 \ucd9c\uc2dc\ub418\uae30 \uc804\uc5d0 \uc5bc\ub9ac \uc561\uc138\uc2a4 \ub9b4\ub9ac\uc2a4 \ubc84\uc804\uc744 \uc0ac\uc6a9\ud574 \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ucd5c\uc2e0 Java \ubc84\uc804\uc744 \uc0ac\uc6a9\ud558\ub294 \ud300\uc740 \uc2e4\uc81c\ub85c \ubaa8\ub4e0 \uc774\uc810\uc744 \ub204\ub9b4 \uc218 \uc788\uc2b5\ub2c8\ub2e4.\n\ud45c\uc900\n\ud45c\uc900\uc740 \uc5b8\uc5b4 \uae30\ub2a5\ub9cc\ud07c \uac1c\ubc1c\uc790\uc758 \ud765\ubbf8\ub97c \ub04c\uc9c0\ub294 \uc54a\uc9c0\ub9cc Java, Java EE, Jakarta EE \ubc0f \uac1c\ubc1c\uc790\uac00 \ub9c8\uc8fc\uce58\uac8c \ub418\ub294 \uc77c\ubc18\uc801\uc778 \uc0ac\uc6a9 \uc0ac\ub840\uc5d0 \ub300\ud55c \ud45c\uc900\uc774 \uc788\uc73c\uba74 \uac1c\ubc1c\uc790\uc758 \uc0b6\uc774 \ub354 \ud3b8\ud574\uc9d1\ub2c8\ub2e4. JDBC\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc640 \ud1b5\uc2e0\ud558\ub294 \ubc29\ubc95\uc744 \uc774\ud574\ud55c\ub2e4\ub294 \uac83\uc740 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \ub4dc\ub77c\uc774\ubc84\uac00 \uad6c\ud604\ub418\ub294 \ubc29\uc2dd\uc5d0 \uc2e0\uacbd \uc4f8 \ud544\uc694\uac00 \uc5c6\uc73c\uba70 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc640 \uc0c1\ud638\uc791\uc6a9\ud558\ub294 \ubc29\uc2dd\uc774 \ud56d\uc0c1 \ub3d9\uc77c\ud558\ub2e4\ub294 \uac83\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4. JCP\ub294 Java \ud45c\uc900\uc744 \ud30c\uc545\ud558\ub294 \ub370 \uc0ac\uc6a9\ub418\ub294 \ud504\ub85c\uc138\uc2a4 \uc911 \ud558\ub098\uc785\ub2c8\ub2e4.\nJava \uc5b8\uc5b4 \uc0ac\uc591\uc740 Java \uc5b8\uc5b4\uc758 \ud615\ud0dc\uc640 \ucef4\ud30c\uc77c\ub7ec\uc758 \uc791\ub3d9 \ubc29\uc2dd\uc744 \uc124\uba85\ud569\ub2c8\ub2e4. \uc5ec\uae30\uc5d0\ub294 JVM \ub610\ub294 \ud558\ub4dc\uc6e8\uc5b4\uc5d0 \uad00\uacc4\uc5c6\uc774 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \uc791\ub3d9 \ubc29\uc2dd\uc744 \uc608\uce21\ud558\ub294 \ub370 \ub3c4\uc6c0\uc774 \ub418\ub294 Java \uba54\ubaa8\ub9ac \ubaa8\ub378\uc774 \ud3ec\ud568\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4. Java \uac00\uc0c1 \uba38\uc2e0 \uc0ac\uc591\uc740 JVM\uc5d0 \uad00\ud55c \ud558\uc704 \uc218\uc900 \uc138\ubd80 \uc815\ubcf4\ub97c \uc124\uba85\ud569\ub2c8\ub2e4. \uc774\ub7ec\ud55c \uc0ac\uc591\uc744 \ud1b5\ud574 \uc11c\ub85c \ub2e4\ub978 \uc81c\uacf5\uc5c5\uccb4\uc5d0\uc11c \ubc30\ud3ec\ud55c JDK\uac00 \ub2e4\uc591\ud55c \ud50c\ub7ab\ud3fc\uc5d0\uc11c \uc2e4\ud589\ub418\uace0 \uc9c0\uc815\ub41c \uc608\uce21 \uac00\ub2a5\ud55c \ubc29\uc2dd\uc73c\ub85c \uc791\ub3d9\ud558\ub3c4\ub85d \ub9cc\ub4e4 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uadf8 \uacb0\uacfc \uc6b0\ub9ac\ub294...\n\uc791\uc131\uc740 \ud55c \ubc88\ub9cc, \uc2e4\ud589\uc740 \uc5b4\ub514\uc11c\ub098\nWORA\ub294 Java\uc758 \uae30\ubc18\uc774 \ub41c \uc6d0\ub798 \uc544\uc774\ub514\uc5b4 \uc911 \ud558\ub098\ub85c, \uc624\ub298\ub0a0\uc5d0\ub294 \ub108\ubb34\ub098 \ub2f9\uc5f0\uc2dc\ub418\uc5b4 \uc774 \uac1c\ub150\uc774 \uc5bc\ub9c8\ub098 \ud601\uc2e0\uc801\uc774\uc5c8\ub294\uc9c0 \uae68\ub2eb\uc9c0 \ubabb\ud560 \uc815\ub3c4\uc785\ub2c8\ub2e4. 2002\ub144 \uc81c\uac00 \ubab8 \ub2f4\uc558\ub358 \ub9e4\uc6b0 \ud070 \uc870\uc9c1\uc5d0\uc11c\ub294 \uc774\uc804 \uae30\uc220 \uc2a4\ud0dd\uc5d0\uc11c Java\ub85c \uc804\ud658\ud588\uc2b5\ub2c8\ub2e4. \uc218\ub9ce\uc740 \ub2e4\ub978 \ud558\ub4dc\uc6e8\uc5b4\uac00 \uc774\ubbf8 \uc788\ub294 \uc0c1\ud669\uc5d0\uc11c \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc6a9 \ud2b9\uc815 \ud558\ub4dc\uc6e8\uc5b4\ub97c \uad6c\ub9e4\ud558\uc9c0 \uc54a\uace0 \uc0c8\ub85c\uc6b4 Java \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uc2e4\ud589\ud560 \uc218 \uc788\ub2e4\ub294 \uac83\uc774 \ubaa8\ub4e0 \uac1c\ubc1c\uc744 Java\ub85c \uc62e\uae34 \uc8fc\uc694 \uc774\uc720 \uc911 \ud558\ub098\uc600\uc2b5\ub2c8\ub2e4. \ud074\ub77c\uc6b0\ub4dc\uc758 \uc2dc\ub300\uc774\uae30\ub3c4 \ud55c \uc624\ub298\ub0a0 \uc774 \uc0ac\ub840\ub294 \uad00\ub828\uc131\uc774 \ubcc4\ub85c \uc5c6\uc5b4 \ubcf4\uc77c \uc218 \uc788\uc9c0\ub9cc WORA\uc758 \uc791\ub3d9\uc774 \ud56d\uc0c1 \ubcf4\uc774\ub294 \uac8c \uc544\ub2c8\ub77c\uace0 \ud574\uc11c \uc5ec\uc804\ud788 \uadf8 \uc774\uc810\uc744 \ud65c\uc6a9\ud558\uc9c0 \uc54a\ub294 \uac83\uc740 \uc544\ub2d9\ub2c8\ub2e4. \uadf8\ub9ac\uace0 \ub2f9\uc5f0\ud55c \ub9d0\uc774\uc9c0\ub9cc IntelliJ IDEA(\ub610\ub294 NetBeans)\ub97c \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0 \ub370\uc2a4\ud06c\ud1b1\uc5d0\uc11c WORA\ub97c \ud65c\uc6a9\ud558\uac8c \ub429\ub2c8\ub2e4.\n\uc131\ub2a5\nJava\uc5d0 \uc775\uc219\ud558\uc9c0 \uc54a\uc740 \uc0ac\ub78c\ub4e4\uc5d0\uac8c \ub180\ub77c\uc6b4 \ud2b9\uc9d5\uc774\uc9c0\ub9cc Java\ub294 \uc131\ub2a5\uc774 \ub9e4\uc6b0 \ub192\uc740 \uc5b8\uc5b4\uc785\ub2c8\ub2e4. 25\ub144 \ub3d9\uc548 \uc131\ub2a5\uc774 \uac1c\uc120\ub418\uc5b4\uc628 \uc131\uc219\ud55c \ud50c\ub7ab\ud3fc\uc73c\ub85c\uc11c, \ub2e4\uc591\ud55c \uc131\ub2a5 \ud504\ub85c\ud30c\uc77c\uc744 \uac00\uc9c4 \uc218\ub9ce\uc740 \uac00\ube44\uc9c0 \uceec\ub809\ud130\uac00 \uc788\uc73c\uba70 JVM\uc740 \uc2e4\uc81c \ud504\ub85c\ub355\uc158 \uc0ac\uc6a9 \uc0ac\ub840\uc5d0\uc11c \ub300\ubd80\ubd84\uc758 \uc778\uac04 \uac1c\ubc1c\uc790\uac00 \ud560 \uc218 \uc788\ub294 \uac83\ubcf4\ub2e4 \ud6e8\uc52c \ub354 \ud6a8\uacfc\uc801\uc73c\ub85c \ub7f0\ud0c0\uc784 \uc2dc \ucf54\ub4dc\ub97c \ucd5c\uc801\ud654\ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4 Java\ub294 \ud2b8\ub79c\uc7ad\uc158\uc758 \uc9c0\uc5f0 \uc2dc\uac04\uc774 \uc9e7\uc544\uc57c \ud558\uace0 \uc131\ub2a5\uc774 \uc608\uce21 \uac00\ub2a5\ud574\uc57c \ud558\ub294 \uae08\uc735\uc5c5\uacc4\uc5d0\uc11c \ub110\ub9ac \uc0ac\uc6a9\ub429\ub2c8\ub2e4.\n\uba54\ubaa8\ub9ac \uad00\ub9ac \ubc0f \uac00\ube44\uc9c0 \uceec\ub809\uc158\n\uc790\ub3d9 \uac00\ube44\uc9c0 \uceec\ub809\uc158\uc740 25\ub144\uc774 \uc9c0\ub09c \uc9c0\uae08, \uc77c\ubc18\uc801\uc73c\ub85c \ub2f9\uc5f0\ud558\uac8c \uc5ec\uae30\uac8c \ub41c \ub610 \ub2e4\ub978 \uae30\ub2a5\uc785\ub2c8\ub2e4. \uc0ac\uc6a9\uc790\ub294 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \uba54\ubaa8\ub9ac\ub97c \ud560\ub2f9\ud558\ub294 \ubc29\ubc95\uc774\ub098 \uba54\ubaa8\ub9ac \uc5ec\uc720 \uacf5\uac04\uc744 \ud655\ubcf4\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uace0\ubbfc\ud560 \ud544\uc694\uac00 \uc5c6\uc2b5\ub2c8\ub2e4. \uac01 JVM\uc5d0\ub294 \ud558\ub098 \uc774\uc0c1\uc758 \uc11c\ub85c \ub2e4\ub978 GC \uc54c\uace0\ub9ac\uc998\uc774 \uc788\uc73c\ubbc0\ub85c \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \ub0b4\ubd80 \uc0c1\ud0dc\uc5d0 \ud06c\uac8c \uc2e0\uacbd \uc4f8 \ud544\uc694 \uc5c6\uc774 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \uc798 \uc791\ub3d9\ud558\ub294 \uc54c\uace0\ub9ac\uc998 \uc120\ud0dd\ud558\uace0 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \ube44\uc988\ub2c8\uc2a4 \ub85c\uc9c1\uc744 \uc791\uc131\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.\n\uad00\ucc30 \uac00\ub2a5\uc131 \ubc0f \uad00\ub9ac\n\uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc774 \uc2e4\ud589\ub418\ub294 \ub3d9\uc548 \uc9c4\ud589 \uc911\uc778 \uc791\uc5c5\uc744 \ud655\uc778\ud558\uace0 \uc2f6\uc740 \uacbd\uc6b0 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \ub3c4\uad6c\uac00 \ub9e4\uc6b0 \ub9ce\uc774 \uc788\uc2b5\ub2c8\ub2e4. \ud2b9\ud788 Java Flight Recorder \ubc0f Mission Control\uc774 OpenJDK\uc5d0 \ud3ec\ud568\ub418\uc5b4(Java 11 \uc774\ud6c4) \ub300\ubd80\ubd84\uc758 \ub3c4\uad6c\uac00 \ubb34\ub8cc\uc785\ub2c8\ub2e4. JMX\uc640 \uac19\uc740 \ub3c4\uad6c\ub97c \uc0ac\uc6a9\ud558\uba74 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \ub3d9\uc801\uc73c\ub85c \uad00\ub9ac\ud560 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4.\nJava \uac00\uc0c1 \uba38\uc2e0(JVM)\n\uc9c0\uae08\uae4c\uc9c0 \uc5b8\uae09\ud55c \uc218\ub9ce\uc740 \uae30\ub2a5\uc740 JVM\uc758 \ud2b9\uc9d5\uc774\uc9c0\ub9cc, JVM\uc740 Java \uc5b8\uc5b4 \uc790\uccb4\ub294 \ubcc4\uac1c\uc758 \uac83\uc774\ub77c\ub294 \uc0ac\uc2e4\uc744 \ud2b9\ud788 \uba85\ud655\ud788 \ud558\uace0 \uc2f6\uc2b5\ub2c8\ub2e4. \uc774\ubbf8 \ub2e4\ub8e8\uc5c8\ub358 \uae30\ub2a5 \uc911 \uba87\uac00\uc9c0(WORA, \ub7f0\ud0c0\uc784 \ucd5c\uc801\ud654, \uc131\ub2a5, \uc81c\uacf5\uc5c5\uccb4 \uc120\ud0dd \ub4f1)\ub97c \ud3ec\ud568\ud558\uc5ec JVM\uc774 \uc0ac\ub791\ubc1b\ub294 \uc774\uc720\ub294 \ub2e4\uc591\ud558\uc9c0\ub9cc, \uc774\ub7ec\ud55c \uae30\ub2a5 \ub300\ubd80\ubd84\uc740 \ud45c\uc900\uacfc \uc0ac\uc591 \ub355\uc5d0 \uad6c\ud604\ub41c \uac83\uc785\ub2c8\ub2e4. \ub610\ud55c JVM\uc774 Java \uc5b8\uc5b4\uc640 \ubcc4\uac1c\uc758 \uac83\uc774\ub77c\ub294 \uc0ac\uc2e4\ub3c4 \uc911\uc694\ud569\ub2c8\ub2e4. \uc774\ub294 \ub2e4\uc591\ud55c \uc5b8\uc5b4\ub97c \uc774 \ud50c\ub7ab\ud3fc\uc5d0 \uad6c\ucd95\ud560 \uc218 \uc788\uace0, \ubc29\uae08 \uc5b8\uae09\ub41c JVM\uc758 \ub6f0\uc5b4\ub09c \uae30\ub2a5\uc744 \ubaa8\ub450 \ud65c\uc6a9\ud558\ub294 \ub3d9\uc2dc\uc5d0 \ub2e4\uc591\ud55c \uc720\ud615\uc758 \uad6c\ubb38\uacfc \uc5b8\uc5b4 \uae30\ub2a5\uc744 \uc81c\uacf5\ud560 \uc218 \uc788\ub2e4\ub294 \ub73b\uc774\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4.\n\uae30\ud0c0 JVM \uc5b8\uc5b4\nJava 6\uacfc 8 \uc0ac\uc774\uc758 \uc870\uc6a9\ud55c \uc2dc\ub300(Java 7\uc5d0\ub294 \ud6cc\ub96d\ud55c \uae30\ub2a5\uc774 \uc788\uc9c0\ub9cc, Java \uac1c\ubc1c\uc790\uc5d0\uac8c\ub294 \ud070 \ub9b4\ub9ac\uc2a4\ucc98\ub7fc \ub290\uaef4\uc9c0\uc9c0 \uc54a\uc558\uc2b5\ub2c8\ub2e4)\uc5d0 Java\uac00 \uc0b4\uc544\ub0a8\uace0 \uc2ec\uc9c0\uc5b4 \ubc1c\uc804\ud588\ub358 \uc774\uc720 \uc911 \ud558\ub098\ub294 \uae30\ud0c0 JVM \uc5b8\uc5b4 \ub355\ubd84\uc785\ub2c8\ub2e4. \ubb3c\ub860 JetBrains\uac00 \uac00\uc7a5 \uc88b\uc544\ud558\ub294 \uc5b8\uc5b4\ub294 Kotlin\uc774\uc9c0\ub9cc, JVM\uc740 Groovy, Scala, Clojure, JRuby\uc640 \uac19\uc740 \ub2e4\ub978 \uc778\uae30 \uc5b8\uc5b4 \ubc0f \uae30\ud0c0 \uc218\ub9ce\uc740 \uc7ac\uad6c\ud604 \uc5b8\uc5b4 \ub610\ub294 \uc0c8\ub85c\uc6b4 \uc5b8\uc5b4\uac00 \uc0ac\uc6a9\ub418\ub294 \ud50c\ub7ab\ud3fc\uc785\ub2c8\ub2e4. \ub300\ubd80\ubd84\uc758 \uacbd\uc6b0 \uc774\ub7ec\ud55c \uc5b8\uc5b4\uc640 \uae30\ubcf8 Java \uac04\uc758 \uc0c1\ud638 \uc6b4\uc6a9\uc131\uc740 \ub2e4\uc591\uc131\uc744 \uc218\uc6a9\ud558\uace0 \ud65c\uc6a9\ud560 \uc218 \uc788\ub3c4\ub85d \ub3c4\uc640\uc90d\ub2c8\ub2e4.\n\ub77c\uc774\ube0c\ub7ec\ub9ac\/\ud504\ub808\uc784\uc6cc\ud06c\n\uac00\uc7a5 \ub9e4\ub825\uc801\uc778 \ud2b9\uc9d5 \uc911 \ud558\ub098\ub294 \uc218\ub9ce\uc740 \ub77c\uc774\ube0c\ub7ec\ub9ac\uc640 \ud504\ub808\uc784\uc6cc\ud06c\ub97c \uc120\ud0dd\ud560 \uc218 \uc788\uace0 \uadf8\uc911 \ub2e4\uc218\uac00 \uc624\ud508 \uc18c\uc2a4\uc774\uba70 \ubb34\ub8cc\ub85c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4\ub294 \uac83\uc785\ub2c8\ub2e4. \ud2b9\ud788 Spring \ubc0f Spring Boot\uc640 \uac19\uc740 \uc778\uae30 \ud504\ub808\uc784\uc6cc\ud06c\ub97c \uc0ac\uc6a9\ud558\uba74 \uc18c\uaddc\ubaa8 \uc11c\ube44\uc2a4\uc5d0\uc11c \ub300\uaddc\ubaa8\uc758 \ubcf5\uc7a1\ud55c \uc5d4\ud130\ud504\ub77c\uc774\uc988 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0 \uc774\ub974\uae30\uae4c\uc9c0 \ubaa8\ub4e0 \uac83\uc744 \uc27d\uac8c \uc791\uc131\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ud45c\uc900\uc774 \uc788\uc73c\uba74 \ub9ce\uc740 \uacbd\uc6b0 \ub2e4\ub978 \ucee8\ud14d\uc2a4\ud2b8\uc5d0\uc11c \ube44\uc2b7\ud55c \ud56d\ubaa9\uc744 \uc0ac\uc6a9\ud560 \ub54c \ub77c\uc774\ube0c\ub7ec\ub9ac\ub97c \uc774\ud574\ud558\uace0 \uc0ac\uc6a9\ud558\ub294 \uac83\uc774 \uc5b4\ub835\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. Java\uac00 \uc131\uc219\ub418\uc5c8\uace0 \ud574\ub2f9 \ucee4\ubba4\ub2c8\ud2f0\uac00 \uc624\ud508 \uc18c\uc2a4\ub97c \uc870\uae30\uc5d0 \ucc44\ud0dd\ud55c \ub9cc\ud07c, \ub300\uac1c \ud45c\uc900 \uad00\ub828 \ubb38\uc81c\uc5d0 \ub300\ud55c \ud574\uacb0\ucc45\uc774 \ub9c8\ub828\ub418\uc5b4 \uc788\uc73c\ubbc0\ub85c \ucc98\uc74c\ubd80\ud130 \uc5f0\uad6c\ub97c \uc2dc\uc791\ud560 \ud544\uc694\uac00 \uc5c6\uc2b5\ub2c8\ub2e4. \ub610\ud55c \uc774\ub7ec\ud55c \ud574\uacb0\ucc45 \uc911 \ub300\ubd80\ubd84\uc774 \uc624\ub7ab\ub3d9\uc548 \uc0ac\uc6a9\ub418\uc5b4 \uc654\uae30 \ub54c\ubb38\uc5d0 \ucda9\ubd84\ud788 \ud14c\uc2a4\ud2b8\ub418\uace0 \uc774\ud574\ud558\uae30 \uc26c\uc6b0\uba70 \ubb38\uc11c\ub85c \uc798 \uc815\ub9ac\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4.\n\ube4c\ub4dc \ub3c4\uad6c \ubc0f \uc885\uc18d \uc694\uc18c \uad00\ub9ac\n\ubd88\uc30d\ud55c \uac1c\ubc1c\uc790(\uc800\uc694!)\uac00 \uc2e4\ud589\ud558\ub824\ub294 \ucf54\ub4dc\uc5d0 \ud544\uc694\ud55c \ud074\ub798\uc2a4\uac00 \uc77c\ubd80 \ub4e4\uc5b4 \uc788\ub294 \uc54c \uc218 \uc5c6\ub294 JAR \ud30c\uc77c\uc744 \uc778\ud130\ub137\uc5d0\uc11c \uac80\uc0c9\ud574\uc57c \ud588\ub358 \uc2dc\uc808\uc740 \uc624\ub798\uc804\uc5d0 \ub05d\ub0ac\uc2b5\ub2c8\ub2e4. \ud2b9\ud788 Maven\uacfc Gradle\uc744 \uc0ac\uc6a9\ud558\uba74 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uac04\ud3b8\ud558\uac8c \ube4c\ub4dc\ud558\uace0 \ubc30\ud3ec\ud560 \uc218 \uc788\uc744 \ubfd0\ub9cc \uc544\ub2c8\ub77c \ud544\uc694\ud55c \ubaa8\ub4e0 \uc885\uc18d \uc694\uc18c\ub97c \ud3ec\ud568\ud558\uc5ec \ud45c\uc900 \ubc29\uc2dd\uc73c\ub85c \ud504\ub85c\uc81d\ud2b8\ub97c \uc27d\uac8c \uc124\uc815\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub610\ud55c \uc0c8\ub85c\uc6b4 \ud504\ub85c\uc81d\ud2b8\ub4e0 \uae30\uc874 \ud504\ub85c\uc81d\ud2b8\ub4e0 \ucf54\ub529\uc744 \uc27d\uac8c \uc2dc\uc791\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. Maven Central\uc774\ub098 Bintray\uc640 \uac19\uc740 \uacf5\uc6a9 \uc800\uc7a5\uc18c\ub97c \uc0ac\uc6a9\ud558\uba74 \ub77c\uc774\ube0c\ub7ec\ub9ac\ub97c \uac80\uc0c9\ud558\uace0 \uac8c\uc2dc\ud560 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4.\nJUnit \ubc0f \uc790\ub3d9\ud654\ub41c \ud14c\uc2a4\ud2b8\nJUnit\uc740 1997\ub144\uc5d0 \uc81c\uc791\ub418\uc5b4 Java\ub9cc\ud07c \uc624\ub798\ub418\uc5c8\uc2b5\ub2c8\ub2e4! Java \uc138\uacc4\uc5d0\uc11c \uac00\uc7a5 \uc77c\ubc18\uc801\uc778 \uc790\ub3d9\ud654\ub41c \ud14c\uc2a4\ud2b8 \ud504\ub808\uc784\uc6cc\ud06c\ub85c\uc11c, IntelliJ IDEA\uc5d0\uc11c\ub294 \uc0c8\ub85c\uc6b4 Java \ud504\ub85c\uc81d\ud2b8\uc5d0\ub294 \ud14c\uc2a4\ud2b8 \ud504\ub808\uc784\uc6cc\ud06c\uac00 \ud544\uc694\ud558\ub2e4\ub294 \uace0\ub824 \ud558\uc5d0 JUnit \ubc0f TestNG\ub97c \ubaa8\ub450 \ud568\uaed8 \uc81c\uacf5\ud569\ub2c8\ub2e4. \ubaa8\ub4e0 \uc5b8\uc5b4\uc5d0 \ub300\ud55c \ucd5c\uc2e0 \ud14c\uc2a4\ud2b8 \ud504\ub808\uc784\uc6cc\ud06c \uc5ed\uc2dc \uc9c0\uae08\uc740 \ub2f9\uc5f0\ud558\uac8c \uc5ec\uaca8\uc9c0\ub294 JUnit\uc758 \uc544\uc774\ub514\uc5b4\ub97c \uae30\ubc18\uc73c\ub85c \ud569\ub2c8\ub2e4. Java \ucee4\ubba4\ub2c8\ud2f0\uc758 \uc790\ub3d9\ud654\ub41c \ud14c\uc2a4\ud2b8 \ubb38\ud654\ub294 \uc774 \ud558\ub098\uc758 \ub77c\uc774\ube0c\ub7ec\ub9ac \ub355\ubd84\uc5d0 \uc131\uc7a5\ud588\uc2b5\ub2c8\ub2e4.\nIDE\n\uc5ec\uae30\ub294 IntelliJ IDEA \ube14\ub85c\uadf8\ub77c\ub294 \uc0ac\uc2e4\uc744 \uc808\ub300 \uc78a\uc5b4\uc11c\ub294 \uc548 \ub418\uaca0\uc8e0! Java\uc758 \ubc29\ub300\ud568 \ub54c\ubb38\uc5d0 IDE\uac00 \ud544\uc694\ud558\ub2e4\uace0 \uc0dd\uac01\ud558\ub4e0, \uc2e4\uc81c\ub85c Java\uac00 \uc815\uc801 \uc720\ud615 \ub54c\ubb38\uc5d0 IDE\ub97c \ud06c\uac8c \ud65c\uc6a9\ud560 \uc218 \uc788\ub2e4\uace0 \uc0dd\uac01\ud558\ub4e0 \uad00\uacc4\uc5c6\uc774 Java \uac1c\ubc1c\uc790\uac00 IDE\ub97c \uc88b\uc544\ud55c\ub2e4\ub294 \uac83\uc740 \uc0ac\uc2e4\uc785\ub2c8\ub2e4(\uc800\ud76c\ub3c4 \uc5ec\ub7ec\ubd84\uc744 \uc88b\uc544\ud558\uace0\uc694!). \uac1c\ubc1c\uc790\uac00 IDE(IntelliJ IDEA, Eclipse \ub610\ub294 NetBeans\uc774\ub4e0)\ub97c \ud6a8\uacfc\uc801\uc73c\ub85c \uc0ac\uc6a9\ud558\ub294 \ubc29\ubc95\uc744 \ubc30\uc6b0\uba74 \ucf54\ub4dc \uc644\uc131, \ucf54\ub4dc \uc0dd\uc131, \ud14c\uc2a4\ud2b8 \uc2e4\ud589, \ub514\ubc84\uadf8, \ud0d0\uc0c9 \ubc0f \uae30\ud0c0 \uc218\ub9ce\uc740 \uae30\ub2a5\uc744 \uc774\uc6a9\ud574 \uc0dd\uc0b0\uc131\uc744 \ud06c\uac8c \ud5a5\uc0c1\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. Java \uac1c\ubc1c\uc790\ub294 IDE\uac00 \uc81c\uacf5\ud558\ub294 \uc774\uc810\uc744 \uc77c\ubc18\uc801\uc73c\ub85c \ub9e4\uc6b0 \uc88b\uc544\ud569\ub2c8\ub2e4.\nCommunity\nJava \ucee4\ubba4\ub2c8\ud2f0\ub294 \uac70\ub300\ud558\uace0 \uc131\uc219\ub418\uc5c8\uc73c\uba70 \ud65c\uae30\ucc28\uace0 \uce5c\uc808\ud55c \ucee4\ubba4\ub2c8\ud2f0\uc785\ub2c8\ub2e4. \uc804 \uc138\uacc4 \uc5ec\ub7ec \ub3c4\uc2dc\uc5d0 Java \uc0ac\uc6a9\uc790 \uadf8\ub8f9\uc774 \uc788\uc73c\uba70 \ubb3c\ub9ac\uc801 \ubaa8\uc784\uc5d0 \uac08 \uc218 \uc5c6\ub294 \uacbd\uc6b0 \ucc38\uc5ec\ud560 \uc218 \uc788\ub294 \uac00\uc0c1 Java \uc0ac\uc6a9\uc790 \uadf8\ub8f9\ub3c4 \uc788\uc2b5\ub2c8\ub2e4. Java Champion\uc740 Java \ubc0f JVM \uac1c\ubc1c\uc790\uc5d0\uac8c \uc720\uc6a9\ud558\uac70\ub098 \ud765\ubbf8\ub85c\uc6b4 \uc815\ubcf4\ub97c \uacf5\uc720\ud558\ub294 \uac83\uc73c\ub85c \uc54c\ub824\uc9c4 \uc720\uba85\ud55c Java \uc138\uacc4\uc758 \uae30\uc220 \ub9ac\ub354\uc785\ub2c8\ub2e4. Java\uc5d0\ub294 JDK \uc790\uccb4\ub97c \ud3ec\ud568\ud558\uc5ec OpenJDK\ub97c \ud1b5\ud55c \uac70\ub300\ud55c \uc624\ud508 \uc18c\uc2a4 \ucee4\ubba4\ub2c8\ud2f0\uac00 \uc788\uc2b5\ub2c8\ub2e4. Java \ucee4\ubba4\ub2c8\ud2f0\ub294 \ud559\uc2b5, \uad50\uc721, \uc9c0\uc18d\uc801\uc778 \ud5a5\uc0c1\uc5d0 \uac00\uce58\ub97c \ub450\uace0 \ud45c\uc900 \ubc0f '\ubaa8\ubc94 \uc0ac\ub840'\uc5d0 \uad00\uc2ec\uc744 \uac00\uc9c0\uba70 \uc2e4\uc81c \ud658\uacbd\uc5d0\uc11c \uc774\ub97c \uc801\uc6a9\ud558\ub294 \ubc29\ubc95\uc5d0 \uad00\ud574 \uc2e4\uc6a9\uc801\uc73c\ub85c \uc811\uadfc\ud569\ub2c8\ub2e4.\n\uac1c\ubc1c\ud300\n\ubb3c\ub860 \ucee4\ubba4\ub2c8\ud2f0\ub3c4 \uc0ac\ub78c\ub4e4\ub85c \uad6c\uc131\ub418\uc5b4 \uc788\uc9c0\ub9cc \uac1c\ubc1c\uc790\uc5d0\uac8c \uc790\uc2e0\uc774 \uac00\uc7a5 \uc911\uc694\ud558\uac8c \uc0dd\uac01\ud558\ub294 Java \uad00\ub828 \uc694\uc18c\uc5d0 \uad00\ud574 \uc9c8\ubb38\ud558\uba74 \ub300\ubd80\ubd84\uc774 \uc790\uc2e0\uc5d0\uac8c \uc601\ud5a5\uc744 \ubbf8\uce5c Java \uc138\uacc4\uc758 \uac1c\uc778\uc744 \uaf3d\uc2b5\ub2c8\ub2e4. \uc774\ub7ec\ud55c \uac1c\uc778\ub4e4\uc5d0\ub294 \ub3d9\ub8cc \ubc0f \uad50\uc0ac\ubd80\ud130 Brian Goetz, Angie Jones, Georges Saab, Mala Gupta, Venkat Subramaniam\uacfc \uac19\uc740 \uc0ac\ub78c\ub4e4\uae4c\uc9c0 \ub2e4\uc591\ud558\uac8c \uc788\uc2b5\ub2c8\ub2e4. \uc5b4\ub5a4 \uc774\ub4e4\uc740 \uc800\ub97c \uc5b8\uae09\ud558\uae30\ub3c4 \ud569\ub2c8\ub2e4. \uac1c\uc778\uc801\uc73c\ub85c \uc800\ub294 \ub300\ud559\uc5d0\uc11c Java\ub97c \ubc30\uc6b4 \ud6c4 \uc77c\uc790\ub9ac\uac00 \ub9ce\uc558\uae30 \ub54c\ubb38\uc5d0 Java \uc138\uacc4\uc5d0 \ub4e4\uc5b4\uc654\uc9c0\ub9cc, \uc5ec\uae30\uc5d0 \uacc4\uc18d \uba38\ubb38 \uc774\uc720\ub294 \uc774\uacf3\uc758 \uc0ac\ub78c\ub4e4\uc744 \uc0ac\ub791\ud558\uace0 \uc774\ub4e4\ub85c\ubd80\ud130 \uc5bb\uc740 \ub3c4\uc6c0\uacfc \uc9c0\uc6d0\uc5d0 \uac10\uc0ac\ud588\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4.\nJavadoc \ubc0f \ubb38\uc11c\nJava\ub294 Javadoc\uc744 \ud1b5\ud574 API \ubb38\uc11c\ub97c \uc5b8\uc5b4\uc758 \ud575\uc2ec \ubd80\ubd84\uc73c\ub85c \ub9cc\ub4ed\ub2c8\ub2e4. \uc138 \uac00\uc9c0 \ub2e4\ub978 \uc720\ud615\uc758 \uc8fc\uc11d(Javadoc, \ube14\ub85d \ubc0f \uc904)\uc740 \uac1c\ubc1c\uc790\uac00 \ub0a8\uae34 \uc8fc\uc11d\uc758 \ub9d0\uc758 \uc885\ub958\uac00 \ubb34\uc5c7\uc778\uc9c0 \uba85\ud655\ud558\uac8c \ub098\ud0c0\ub0c5\ub2c8\ub2e4. Javadoc\uc740 \ud2b9\ud788 \uba54\uc18c\ub4dc\ub97c \ud638\ucd9c\ud558\uac70\ub098 \ud074\ub798\uc2a4 \ub610\ub294 \ud328\ud0a4\uc9c0\ub97c \uc0ac\uc6a9\ud558\ub294 \ub2e4\ub978 \uac1c\ubc1c\uc790\uc5d0\uac8c \uc720\uc6a9\ud55c \ubb38\uc11c\ub97c \ub0a8\uae30\ub3c4\ub85d \uac1c\ubc1c\uc790\uc5d0\uac8c \uad8c\uc7a5\ud569\ub2c8\ub2e4. \uac1c\ubc1c\uc790\uac00 \ub77c\uc774\ube0c\ub7ec\ub9ac\ub098 \ucf54\ub4dc\uc5d0 \ub300\ud55c \uc790\uc138\ud55c \ud29c\ud1a0\ub9ac\uc5bc \uc815\ubcf4\ub97c \ucc3e\uc744 \uc218 \uc5c6\ub294 \uacbd\uc6b0\uc5d0\ub3c4, \ubcf4\ud1b5\uc740 \uc62c\ubc14\ub978 \ubc29\ud5a5\uc744 \uc9c0\uc2dc\ud574\uc8fc\ub294 Javadoc\uc774 \uc788\uc2b5\ub2c8\ub2e4.\n\ub610\ud55c Java \uc5d0\ucf54\uc2dc\uc2a4\ud15c\uc740 \uc77c\ubc18\uc801\uc73c\ub85c \uac1c\ubc1c\uc790\uc5d0\uac8c \uc591\uc9c8\uc758 \ubb38\uc11c\ub97c \uae30\ub300\ud558\uace0 \uc81c\uacf5\ud558\ub294 \uac83\uc73c\ub85c \ubcf4\uc785\ub2c8\ub2e4. \ud5a5\ud6c4 \uc624\ud508 \uc18c\uc2a4 \ud504\ub85c\uc81d\ud2b8\uc758 \ucee4\ubbf8\ud130\uac00 \ub418\ub824\ub294 \uc774\ub4e4\uc740 Javadoc \uc8fc\uc11d \ub610\ub294 \uae30\ud0c0 \ubb38\uc11c\uc758 pull \uc694\uccad\uc744 \uc81c\ucd9c\ud558\ub3c4\ub85d \uad8c\uc7a5\ubc1b\uace0 \uc804 \uc138\uacc4\uc758 \uac1c\ubc1c\uc790\ub4e4\uc740 \ud2b9\uc815 \ubb38\uc81c\uc5d0 \uad00\ud55c \ud574\uacb0\ucc45\uc744 \uad6c\ud558\uae30 \uc704\ud574 \ube14\ub85c\uadf8\ub098 StackOverflow\uc5d0\uc11c \uc9c8\ubb38 \ubc0f \ub2f5\ubcc0\ud569\ub2c8\ub2e4.\n\uc624\ud508 \uc18c\uc2a4\nJava \ucee4\ubba4\ub2c8\ud2f0\ub294 \uc624\ud508 \uc18c\uc2a4\ub97c \uc870\uae30\uc5d0 \uc218\uc6a9\ud588\uc744 \ubfd0\ub9cc \uc544\ub2c8\ub77c \uc774\uc81c JDK \uc790\uccb4\ub3c4 OpenJDK\ub97c \ud1b5\ud574 \uc624\ud508 \uc18c\uc2a4\ub85c \uc81c\uacf5\ub429\ub2c8\ub2e4. \uc624\ud508 \uc18c\uc2a4\ub97c \uc0ac\uc6a9\ud558\uba74 \uac1c\uc778\ubfd0\ub9cc \uc544\ub2c8\ub77c \uc5ec\ub7ec \uacf5\uae09\uc5c5\uccb4\ub3c4 \uc27d\uac8c \ucc38\uc5ec\ud558\uace0 \ud611\uc5c5\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. Java \uc790\uccb4\uc758 \ucf54\ub4dc\ub97c \ubcfc \uc218 \uc788\ub2e4\ub294 \uac83\ub3c4 \ub9e4\ub825\uc801\uc785\ub2c8\ub2e4. \uc624\ud508 \uc18c\uc2a4 \ucf54\ub4dc\ub294 \ubcf5\uc7a1\ud55c \ubb38\uc81c\uc5d0 \uad00\ud574 \uc774\ubbf8 \uc5f4\uc2ec\ud788 \uc791\uc5c5\ud558\uace0 \uace0\ubbfc\ud558\uba70 \ud574\uacb0\ud574\uc628 \uc774\ub4e4\ub85c\ubd80\ud130 \uc6b0\ub9ac \uac19\uc740 \uac1c\ubc1c\uc790\uac00 \ubc30\uc6b8 \uc218\uc788\ub294 \uc88b\uc740 \uae30\ud68c\ub97c \uc81c\uacf5\ud569\ub2c8\ub2e4.\n\ubb34\ub8cc\nJava \ud50c\ub7ab\ud3fc\uacfc Java \uc5d0\ucf54\uc2dc\uc2a4\ud15c\uc5d0\uc11c \uac00\uc7a5 \ub9ce\uc774 \uc0ac\uc6a9\ub418\ub294 \ub3c4\uad6c\ub294 \uac1c\ubc1c\uc790\uac00(\ub610\ub294 \uc885\uc885 \uc601\ub9ac\ub2e8\uccb4\ub3c4) \uc0ac\uc6a9\ud560 \ub54c \ub3c8\uc744 \uc9c0\ubd88\ud560 \ud544\uc694\uac00 \uc5c6\uc2b5\ub2c8\ub2e4. Oracle\uc774 Java 11\uc5d0\uc11c \ub77c\uc774\uc120\uc2a4 \ubc0f \uc9c0\uc6d0\uc744 \ubcc0\uacbd\ud55c \ud6c4\uc5d0\ub3c4 Oracle \ubc0f \uae30\ud0c0 \ub9ce\uc740 \uacf5\uae09\uc5c5\uccb4\ub294 \ud504\ub85c\ub355\uc158\uc5d0\uc11c \ubb34\ub8cc\ub85c \uc5b8\uc5b4\ub97c \uc0ac\uc6a9\ud558\ub294 \ubc29\ubc95\uc744 \uacc4\uc18d \uc81c\uacf5\ud588\uc2b5\ub2c8\ub2e4. \uc774 \uae00\uc5d0\uc11c \uc774\ubbf8 \uc5b8\uae09\ub41c \uc624\ud508 \uc18c\uc2a4 \ud504\ub85c\uc81d\ud2b8, \ube4c\ub4dc \ub3c4\uad6c \ubc0f IDE\ub294 \ubaa8\ub450 \ubb34\ub8cc\uc774\uac70\ub098 \ubb34\ub8cc \uc635\uc158\uc774 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub294 \uc608\uc0b0\uc744 \uacc4\uc18d \uace0\ub824\ud558\uba70 \uc18c\ud504\ud2b8\uc6e8\uc5b4\ub97c \uac1c\ubc1c\ud574\uc57c \ud558\ub294 \ubaa8\ub4e0 \uaddc\ubaa8\uc758 \uc870\uc9c1\uc774\ub098 \ucf54\ub529\uc744 \uc2dc\uc791\ud558\ub294 \uac1c\ubc1c\uc790\uc5d0\uac8c Java\uac00 \ub9e4\ub825\uc801\uc778 \uc774\uc720\uc774\uae30\ub3c4 \ud569\ub2c8\ub2e4.\n\uac1d\uccb4 \uc9c0\ud5a5\uc801\n\ubb3c\ub860 \uac1d\uccb4 \uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d\uc740 \uc720\uc77c\ud55c \uc120\ud0dd\uc9c0\ub294 \uc544\ub2c8\uba70 \ubaa8\ub4e0 \ud328\ub7ec\ub2e4\uc784\uc5d0\ub294 \uac01\uac01\uc758 \uc7a5\ub2e8\uc810\uc774 \uc788\uc2b5\ub2c8\ub2e4. Java\ub294 \ucc98\uc74c\ubd80\ud130 \uac1d\uccb4 \uc9c0\ud5a5\uc801 \uc5b8\uc5b4\ub85c \uc124\uacc4\ub418\uc5c8\uae30\uc5d0 \uac1d\uccb4 \uc9c0\ud5a5\uc758 \uc218\ub9ce\uc740 \uc124\uacc4 \ud328\ud134 \uc608\uc2dc\uc640 \uae30\ud0c0 \ucf54\ub529 \ubaa8\ubc94 \uc0ac\ub840\uac00 Java\ub85c \uc2dc\uc5f0\ub429\ub2c8\ub2e4. \ub530\ub77c\uc11c \uac1d\uccb4 \uc9c0\ud5a5\uc801 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\ub97c \uc6d0\ud55c\ub2e4\uba74 Java\ub97c \uc0ac\uc6a9\ud574\ubd10\uc57c \ud560 \uc5b8\uc5b4 \ubaa9\ub85d \uc911 \uc6b0\uc120\uc801\uc73c\ub85c \uace0\ub824\ud574\uc57c \ud560 \uac83\uc785\ub2c8\ub2e4.\n\ubc1c\uc804\uacfc \uc801\uc751\nJava\ub294 \uacfc\uac70\uc5d0\ub3c4 \uadf8\ub7ac\uace0, \uc9c0\uae08 \uc5ed\uc2dc \uac1d\uccb4 \uc9c0\ud5a5\uc801 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc785\ub2c8\ub2e4. \uadf8\ub7ec\ub098 \ud55c\ud3b8\uc73c\ub85c \ub78c\ub2e4 \uc2dd, \ubd88\ubcc0 \ub370\uc774\ud130 \uad6c\uc870\uc640 \uac19\uc740 \ud568\uc218 \ud504\ub85c\uadf8\ub798\ubc0d\uc758 \uc77c\ubd80 \uac1c\ub150\uc744 \uc131\uacf5\uc801\uc73c\ub85c \ub3c4\uc785\ud558\uc5ec \uac1d\uccb4 \uc9c0\ud5a5\uc801 \ud328\ub7ec\ub2e4\uc784 \ub0b4\uc5d0\uc11c \uc6d0\ud65c\ud558\uac8c \uc791\ub3d9\ud558\ub3c4\ub85d \ub9cc\ub4e4\uc5c8\uc2b5\ub2c8\ub2e4. \uc720\ud615 \ucd94\ub860(\uc608: var)\uc744 \uc0ac\uc6a9\ud558\uba74 \uc815\uc801 \uc720\ud615 \uc5b8\uc5b4\uc758 \uc774\uc810\uc744 \uc5bb\uc744 \uc218 \uc788\uc9c0\ub9cc \uc0c1\uc6a9\uad6c\ub294 \uc801\uc2b5\ub2c8\ub2e4. \ucef4\ud4e8\ud130 \uacfc\ud559\uc740 \uc5ec\uc804\ud788 \u200b\u200b\uc80a\uc740 \ubd84\uc57c\uc774\uc9c0\ub9cc, \uc810\ucc28 \uc9c0\uc2dd\uc744 \uc313\uc73c\uba74 \ud559\uc2b5\ud55c \ub0b4\uc6a9\uc744 \uae30\uc874 \ub3c4\uad6c\uc5d0 \uc801\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. Java(\uc5b8\uc5b4 \ubc0f \uc804\uccb4 \uc5d0\ucf54\uc2dc\uc2a4\ud15c)\ub294 \uc0c8\ub85c\uc6b4 \ud2b8\ub80c\ub4dc\uc640 \uc0c8\ub85c\uc6b4 '\ubaa8\ubc94 \uc0ac\ub840'\uc5d0 \ub530\ub77c, \ub610\ud55c \uc2e4\uc81c \ud658\uacbd\uc5d0\uc11c \uc5b4\ub5bb\uac8c \uc791\ub3d9\ud558\ub294\uc9c0 \ud655\uc778\ud55c \uacb0\uacfc\ub97c \ubc14\ud0d5\uc73c\ub85c \uc9c0\uc18d\uc801\uc73c\ub85c \ubc1c\uc804\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4.\nJava\ub294 \ub610\ud55c \ub2e4\ub978 JVM \uc5b8\uc5b4\uc758 \uad6c\ubb38\uacfc \uc544\uc774\ub514\uc5b4\ub97c \ud65c\uc6a9\ud558\uc5ec \uae30\uc874 Java \ud658\uacbd\uc5d0 \uc801\ud569\ud55c \uac83\uacfc \uc801\ud569\ud558\uc9c0 \uc54a\uc744 \uc218 \uc788\ub294 \uac83\uc774 \ubb34\uc5c7\uc778\uc9c0 \ud30c\uc545\ud569\ub2c8\ub2e4. JCP\uc640 OpenJDK\uc640 \uac19\uc774 Java\uac00 \ubc1c\uc804\ud558\uace0 \uc131\uc7a5\ud558\uae30 \uc704\ud574 \uc0ac\uc6a9\ud558\ub294 \ud504\ub85c\uc138\uc2a4\uc640 \ub3c4\uad6c\uc870\ucc28\ub3c4 \uc774\ub7ec\ud55c \ub04a\uc784\uc5c6\ub294 \ubc1c\uc804 \uacfc\uc815\uc5d0\uc11c \uc801\ud569\uc131\uc744 \uc720\uc9c0\ud558\ub3c4\ub85d \uc801\uc751\uc2dc\ud0a4\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub7ec\ud55c \ubc1c\uc804\uacfc \uc801\uc751\uc740 Java\uac00 \ub9de\ucd94\uc5b4\uc57c \ud560 \uc870\uc2ec\uc2a4\ub7ec\uc6b4 \uade0\ud615\uc758 \uc77c\ubd80\uc785\ub2c8\ub2e4.\n\uac00\ub3c5\uc131\uc5d0 \uc911\uc810\nJava \ucf54\ub4dc\ub294 Java \ud504\ub85c\uadf8\ub798\uba38\uac00 \uc544\ub2cc \uc0ac\ub78c\ub3c4 \uc77d\uc744 \uc218 \uc788\ub294 \uacbd\uc6b0\uac00 \ub9ce\uc2b5\ub2c8\ub2e4. \uc774 \uc5b8\uc5b4\ub294 \uacfc\ud558\uac8c \uac04\uacb0\ud558\uae30\ubcf4\ub2e4 \uc7a5\ud669\ud558\uac8c \ud45c\ud604\ub418\ubbc0\ub85c \uc77d\uc744 \ub54c \uc758\ubbf8\ub97c \ucd94\ub860\ud558\uae30\uac00 \ub354 \uc27d\uc2b5\ub2c8\ub2e4. Java \uc5b8\uc5b4 \uac1c\ubc1c\uc790\ub294 \uc608\uae30\uce58 \uc54a\uc740 \uc0ac\uc6a9\uc790 \uc9c0\uc815 \ub3d9\uc791\uc5d0 \ub180\ub77c\uc9c0 \uc54a\ub294 \uac83\uc774 \uc911\uc694\ud558\ub2e4\uace0 \uc0dd\uac01\ud558\uae30 \ub54c\ubb38\uc5d0 \uc5f0\uc0b0\uc790 \uc624\ubc84\ub85c\ub4dc\uc640 \uac19\uc740 \uae30\ub2a5\uc744 \uad6c\ud604\ud558\uc9c0 \uc54a\uc558\uc2b5\ub2c8\ub2e4. \uc5b8\uc5b4\uc640 \ud504\ub808\uc784\uc6cc\ud06c\uc5d0\uc11c\ub294 '\ub9c8\ubc95 \uac19\uc740 \ub3d9\uc791'\uc744 \uae30\ud53c\ud558\ub294 \uacbd\ud5a5\uc774 \uc788\uc2b5\ub2c8\ub2e4. \uc77c\ubd80 \ud504\ub808\uc784\uc6cc\ud06c\uc5d0\uc11c\ub294 \uac1c\ubc1c\uc790\uac00 \ub530\ub85c \uba85\ub839\ud558\uc9c0 \uc54a\uc544\ub3c4 \uad6c\uc131\ubcf4\ub2e4 \uad00\uc2b5(Convention over configuration) \uac19\uc740 \uac83\uc744 \uc0ac\uc6a9\ud574 \uc791\uc5c5\uc744 \uc218\ud589\ud558\uc9c0\ub9cc  \uac00\ub839 AOP(\uad00\uc810 \uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d) \uc218\ud589 \uc2dc \uc5b4\ub178\ud14c\uc774\uc158\uc744 \ucd94\uac00\ud558\ub294 \uac83\uc744 \uc0bc\uac00\ud558\uace0 \ubb38\uc11c \ubc0f \uc815\uc801 \ubd84\uc11d \uac80\uc0ac\uc5d0 \uc5b4\ub178\ud14c\uc774\uc158\uc744 \uc0ac\uc6a9\ud558\ub824\ub294 \uc6c0\uc9c1\uc784\uc774 \ud655\uc5f0\ud788 \uc788\uc2b5\ub2c8\ub2e4. \ucee4\ubba4\ub2c8\ud2f0\uc640 \uc5d0\ucf54\uc2dc\uc2a4\ud15c\uc740 \ud45c\uc900\uacfc '\ubaa8\ubc94 \uc0ac\ub840'\ub97c \uc120\ud638\ud558\ub294 \ud3b8\uc774\ubbc0\ub85c Java \ucf54\ub4dc\ub294 \uc885\uc885 \ub9e4\uc6b0 \ub2e4\ub978 \ud504\ub85c\uc81d\ud2b8\uc5d0\uc11c\ub3c4 \ube44\uc2b7\ud55c \uc885\ub958\uc758 \uaddc\uce59\uc744 \ub530\ub985\ub2c8\ub2e4.\n\uc5b8\uc5b4 \uae30\ub2a5\n\uc9c0\uae08\uae4c\uc9c0 Java\uc5d0 \uad00\ud574 \uc88b\uc544\ud558\ub294 23\uac00\uc9c0\ub97c \ub2e4\ub8e8\uc5c8\uc9c0\ub9cc \uae30\ub2a5\uc740 \ub2e8 \ud558\ub098\ub3c4 \uc5b8\uae09\ud558\uc9c0 \uc54a\uc558\uc2b5\ub2c8\ub2e4! \uc194\uc9c1\ud788 \uae30\ub2a5\uc744 25\uac00\uc9c0\ub85c \ud55c\uc815\ud558\ub294 \uac83\uc740 \ub9e4\uc6b0 \uc5b4\ub824\uc6cc \ubcf4\uc600\uace0, Java\uc5d0 \uad00\ud574 \uc6b0\ub9ac\uac00 \uc88b\uc544\ud558\ub294 \uc218\ub9ce\uc740 \ud2b9\uc9d5\uc774 \ud56d\uc0c1 \uad6c\ubb38\uc774\ub098 \uae30\ub2a5\uc5d0 \uad00\ud55c \uac83\ub9cc\uc740 \uc544\ub2c8\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4. \uadf8\ub798\uc11c \uc88b\uc544\ud558\ub294 \uae30\ub2a5\uc5d0 \uad00\ud574\uc11c\ub294 \uac1c\ubc1c\uc790\uc758 \ubaa9\uc18c\ub9ac\ub85c \uc9c1\uc811 \ub4e4\ub824 \ub4dc\ub9ac\ub824\uace0 \ud569\ub2c8\ub2e4.\n\nCollections API: \uc624\ub7ab\ub3d9\uc548 \uc0ac\uc6a9\ud558\uba70 \ub3c4\uc6c0\uc744 \ub9ce\uc774 \ubc1b\uc558\uc5b4\uc694!\n\ud3b8\ub9ac\ud55c \uceec\ub809\uc158\uc6a9 factory \uba54\uc18c\ub4dc: \uc218\uc815 \ubd88\uac00\ub2a5\ud55c \uceec\ub809\uc158\uc744 \ud6e8\uc52c \uac04\ud3b8\ud558\uac8c \ub9cc\ub4e4 \uc218 \uc788\uc5b4\uc694.\nStreams API: Collections API\uc758 \ud6cc\ub96d\ud55c \ucd94\uac00 \uae30\ub2a5\uc73c\ub85c, Java 8 \uc774\ud6c4\uc5d0\ub3c4 \uacc4\uc18d \ubc1c\uc804\ud558\uace0 \uc788\uc5b4\uc11c \uc88b\uc558\uc2b5\ub2c8\ub2e4. \ubcd1\ub82c \uc2a4\ud2b8\ub9bc\uc73c\ub85c \ucd5c\uc2e0 \ud558\ub4dc\uc6e8\uc5b4\ub97c \ud65c\uc6a9\ud560 \uc218 \uc788\ub294 \ubc29\ubc95\uc774 \uc0dd\uacbc\uc5b4\uc694.\n\ub78c\ub2e4 \uc2dd: Streams API\uc5d0\uc11c \ud2b9\ud788 \uc720\uc6a9\ud558\uc9c0\ub9cc \uadf8 \uc790\uccb4\ub85c\ub3c4 \ub9e4\uc6b0 \uc4f8\ubaa8\uac00 \ub9ce\uc544\uc694.\nOptional: \uba54\uc18c\ub4dc\uac00 \ubb34\uc5b8\uac00\ub97c \uc81c\uacf5\ud558\uc9c0 \uc54a\uc744 \uc218 \uc788\uc74c\uc744 \ud45c\ud604\ud558\ub294 \uc88b\uc740 \ubc29\ubc95\uc774\uc5d0\uc694(NullPointerException\uc73c\ub85c\ubd80\ud130 \ubcf4\ud638\ud574\uc57c \ud560 \ud544\uc694\uac00 \uc5c6\uc5b4\uc838\uc694!). Java 8\ubd80\ud130 Optional\uc5d0 \ub300\ud55c \uac1c\uc120 \uc0ac\ud56d\uc744 \ud655\uc778\ud560 \uc218 \uc788\ub294 \uac83\ub3c4 \uc815\ub9d0 \uc88b\uc544\uc694.\njava.time: \ub0a0\uc9dc \ubc0f \uc2dc\uac04 \uc791\uc5c5\uc744 \uc704\ud55c \ucd5c\uc2e0 API\ub294 \ubc18\uac00\uc6b4 \uac1c\uc120 \uc0ac\ud56d\uc774\uc8e0.\n\uac80\uc0ac\ub41c \uc608\uc678: \uc0ac\ub78c\ub4e4\uc740 \uac80\uc0ac\ub41c \uc608\uc678\ud30c\uc640 \ub7f0\ud0c0\uc784 \uc608\uc678\ud30c\ub85c \ub098\ub258\uc9c0\ub9cc \uc801\uc5b4\ub3c4 \uac80\uc0ac\ub41c \uc608\uc678\ub97c \uc0ac\uc6a9\ud558\ub824\ub294 \uc0ac\ub78c\ub4e4\uc5d0\uac8c\ub294 \uac80\uc0ac\ub41c \uc608\uc678\uac00 \uc81c\uacf5\ub418\uc8e0.\n\uc5b4\ub178\ud14c\uc774\uc158: \uc5b4\ub178\ud14c\uc774\uc158\uc740 (\ub2e4\ub978 \uae30\ub2a5\ub3c4 \uc788\uaca0\uc9c0\ub9cc) \ucef4\ud30c\uc77c\ub7ec\uac00 \ud655\uc778\ud560 \uc218 \uc788\ub294 \ubb38\uc11c\ub098 \ub300\uaddc\ubaa8 \uc791\uc5c5\uc744 \uc218\ud589\ud558\ub294 \ud504\ub808\uc784\uc6cc\ud06c\uc5d0 \ub300\ud55c \uba54\ubaa8 \uac19\uc740 \uc5ed\ud560\uc744 \ud574\uc694.\nJShell: \ub4dc\ub514\uc5b4 REPL\uc5d0\uc11c Java\ub85c \uc791\uc5c5\ud560 \uc218 \uc788\uac8c \ub418\uc5c8\uc5b4\uc694.\nvar: \uc720\ud615 \ucd94\ub860\uc744 \ud604\uba85\ud558\uac8c \uc0ac\uc6a9\ud558\uba74 \ucf54\ub4dc \ub178\uc774\uc988\ub97c \uc904\uc77c \uc218 \uc788\uc5b4\uc694.\n\uc561\uc138\uc2a4 \ud55c\uc815\uc790 \ubc0f \ubaa8\ub4c8\uc131: Java\ub97c \uc0ac\uc6a9\ud558\uba74 \uc5b4\ub5a4 \ucf54\ub4dc\uac00 \uc5b4\ub5a4 \ud544\ub4dc, \uba54\uc18c\ub4dc, \ud074\ub798\uc2a4, \ubaa8\ub4c8\uc5d0 \uc561\uc138\uc2a4\ud560 \uc218 \uc788\ub294\uc9c0 \uc27d\uac8c(Java 9\ubd80\ud130\ub294 \ud6e8\uc52c \ub354 \uc27d\uac8c) \uba85\uc2dc\ud654\ud560 \uc218 \uc788\uc5b4\uc694.\nSwitch \uc2dd: \uc774\uc81c switch \uc2dd\uc744 \uc0ac\uc6a9\ud574\ub3c4 \ub35c \uc9c0\uc800\ubd84\ud574 \ubcf4\uc774\ub124\uc694!\nHelpful NullPointerExceptions: \uc88b\uc740 NullPointerException\uc744 \ub9c8\ub2e4\ud560 \uc0ac\ub78c\uc774 \ub204\uac00 \uc788\uc744\uae4c\uc694? \uc774\uc81c \uc608\uc678\uc5d0\uc11c \ubb34\uc5c7\uc774 null\uc778\uc9c0\uc5d0 \uad00\ud574 \ud6e8\uc52c \uc720\uc6a9\ud55c \uc815\ubcf4\ub97c \uac1c\ubc1c\uc790\uc5d0\uac8c \uc81c\uacf5\ud574\uc918\uc694.\n\ud14c\uc2a4\ud2b8 \ubc84\uc804 \uae30\ub2a5: \ud14c\uc2a4\ud2b8 \ubc84\uc804 \uae30\ub2a5\uc774 \uc815\ub9d0 \uc88b\uc544\uc694! \ub808\ucf54\ub4dc, instanceof\uc758 \ud328\ud134 \uc77c\uce58, \ud14d\uc2a4\ud2b8 \ube14\ub85d \uae30\ub2a5\uc744 \ubcf4\uace0 \uc9c4\uc9dc \uc2e0\ub0ac\uc5b4\uc694.\n\n\ubbf8\ub798\n\uc0c8\ub85c\uc6b4 \uae30\ub2a5\uc740 6\uac1c\uc6d4\ub9c8\ub2e4 \ucd9c\uc2dc\ub418\uba70 \ubcf4\ud1b5 \uac01\uac01\uc758 \uc7a5\uae30\uc801 \uc9c0\uc6d0 \ub9b4\ub9ac\uc2a4\ub294 \ud574\ub2f9 \ub9b4\ub9ac\uc2a4\uc5d0\uc11c \uc2e4\ud589\ub418\ub294 \ubaa8\ub4e0 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0 \ub300\ud574 \uae30\ubcf8\uc801\uc73c\ub85c \ub354 \ub098\uc740 \uc131\ub2a5\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4. Java 15(2020\ub144 9\uc6d4)\uc5d0\ub294 \uc228\uaca8\uc9c4 \ud074\ub798\uc2a4, \ud14d\uc2a4\ud2b8 \ube14\ub85d(\ub354 \uc774\uc0c1 \ud14c\uc2a4\ud2b8 \ubc84\uc804\uc73c\ub85c \uc81c\uacf5\ub418\uc9c0 \uc54a\uc74c), \uc5c5\ub370\uc774\ud2b8\ub41c \ub808\ucf54\ub4dc \ud14c\uc2a4\ud2b8 \ubc84\uc804, instanceof\uc5d0 \ub300\ud55c \ud328\ud134 \uc77c\uce58, \ubd09\uc778\ub41c \ud074\ub798\uc2a4\uc758 \ud14c\uc2a4\ud2b8 \ubc84\uc804\uc774 \ud3ec\ud568\ub420 \uc608\uc815\uc785\ub2c8\ub2e4.\nProject Loom\uc5d0\uc11c \uace0\uc548 \uc911\uc778 \uc0ac\uc6a9\ud558\uae30 \uc27d\uace0 \uac00\ubcbc\uc6b4 \ub3d9\uc2dc \uc2e4\ud589, Project Valhalla\uc758 \uc778\ub77c\uc778 \uc720\ud615, Project Amber\uc5d0\uc11c \uc791\uc5c5 \uc911\uc778 \ub78c\ub2e4\uc758 \uc794\uc5ec \uc694\uc18c(leftovers) \ub4f1\uc758 \ub2e4\uc591\ud55c \uc5b8\uc5b4 \ubcc0\uacbd \uc0ac\ud56d, Project Panama\uc5d0\uc11c \uc9c0\uc6d0\ud558\ub294 \uc678\ubd80 API\uc5d0 \ub300\ud55c \uac04\ud3b8\ud55c \uc561\uc138\uc2a4, Project Leydon\uc5d0\uc11c \uc900\ube44 \uc911\uc778 \uc2dc\uc791 \uc2dc\uac04 \ub2e8\ucd95, \uac00\ube44\uc9c0 \uceec\ub809\ud130\uc5d0 \ub300\ud55c \ub2e4\uc591\ud55c \uac1c\uc120 \uc0ac\ud56d \ub4f1, \ud5a5\ud6c4 \ucd9c\uc2dc\ub418\uae30\ub97c \uae30\ub300\ud558\ub294 \uae30\ub2a5\uc774 \ub9ce\uc2b5\ub2c8\ub2e4.\nJava\uc758 \ubbf8\ub798\ub294 \ubc1d\uc2b5\ub2c8\ub2e4!\n\uc774 \uac8c\uc2dc\ubb3c\uc740 Trisha Gee\uac00 \uc791\uc131\ud55c 25 Things We Love About Java\ub97c \ubc88\uc5ed\ud55c \uae00\uc785\ub2c8\ub2e4.","protected":false},"excerpt":{"rendered":"JetBrains\ub294 \ubaa8\ub4e0 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc640 \ubaa8\ub4e0 \uac1c\ubc1c\uc790\ub97c \uc0ac\ub791\ud569\ub2c8\ub2e4. \uc774\ubc88 \ub2ec 2020\ub144 5\uc6d4\uc5d0\ub294 Java\uac00 25\uc8fc\ub144\uc744 \ub9de\uc2b5\ub2c8\ub2e4! \uadf8\ub798\uc11c \ud2b9\ubcc4\ud788 Java\uc5d0 \ucd08\uc810\uc744 \ub9de\ucdb0 JetBrains\uac00 \uc0ac\ub791\ud558\ub294 Java \ubc0f JVM\uc758 25\uac00\uc9c0 \ud2b9\uc9d5\uc744 \uc0b4\ud3b4\ubcf4\ub824 \ud569\ub2c8\ub2e4.\n\n\n\uc774\uc804 \ubc84\uc804\uacfc\uc758 \ud638\ud658\uc131\nJava\ub294 25\ub144 \uc804\uc758 \ucf54\ub4dc\ub97c \ucd5c\uc2e0 \ubc84\uc804\uc758 Java\uc5d0\uc11c\ub3c4 \uc2e4\ud589\ud560 \uc218 \uc788\ub2e4\ub294 \uc810\uc5d0\uc11c","protected":false},"author":{"name":"Jessie Cho","link":"https:\/\/blog.jetbrains.com\/ko\/author\/jessie-chojetbrains-com"},"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[],"tags":[40,155,4419],"cross-post-tag":[],"acf":[],"featured_image":null,"_links":{"self":[{"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/posts\/34071"}],"collection":[{"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/users\/964"},{"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=34071"}],"version-history":[{"count":2,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/posts\/34071\/revisions"}],"predecessor-version":[{"id":121931,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/posts\/34071\/revisions\/121931"}],"wp:attachment":[{"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/media?parent=34071"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/categories?post=34071"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/tags?post=34071"},{"taxonomy":"cross-post-tag","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/ko\/wp-json\/wp\/v2\/cross-post-tag?post=34071"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}