{"id":146,"date":"2008-02-21T12:29:20","date_gmt":"2008-02-21T12:29:20","guid":{"rendered":"http:\/\/apollo89.com\/wordpress\/?p=146"},"modified":"2013-02-13T22:51:43","modified_gmt":"2013-02-13T13:51:43","slug":"jvm%ec%9d%98-%eb%a9%94%eb%aa%a8%eb%a6%ac%ea%b5%ac%ec%a1%b0%ec%99%80-%ed%98%b8%ec%b6%9c%ec%8a%a4%ed%83%9d","status":"publish","type":"post","link":"https:\/\/apollo89.com\/wordpress\/?p=146","title":{"rendered":"JVM\uc758 \uba54\ubaa8\ub9ac \uad6c\uc870\uc640 \ud638\ucd9c\uc2a4\ud0dd"},"content":{"rendered":"

 <\/p>\n

JVM\uc758 \uba54\ubaa8\ub9ac \uad6c\uc870\ub97c \uc880 \uc54c\uc544\ub458 \ud544\uc694\uac00 \uc0dd\uaca8\uc11c \ucc3e\uc544\ubd24\ub2e4.<\/p>\n

\uc751\uc6a9\ud504\ub85c\uadf8\ub7a8\uc774 \uc2e4\ud589\ub418\uba74, JVM\uc740 \uc2dc\uc2a4\ud15c\uc73c\ub85c\ubd80\ud130 \ud504\ub85c\uadf8\ub7a8\uc744 \uc218\ud589\ud558\ub294\ub370 \ud544\uc694\ud55c \uba54\ubaa8\ub9ac\ub97c \ud560\ub2f9\ubc1b\uace0 JVM\uc740 \uc774 \uba54\ubaa8\ub9ac\ub97c \uc6a9\ub3c4\uc5d0 \ub530\ub77c \uc5ec\ub7ec \uc601\uc5ed\uc73c\ub85c \ub098\ub204\uc5b4 \uad00\ub9ac\ud55c\ub2e4.
\n\uadf8 \uc911 3\uac00\uc9c0 \uc8fc\uc694\uc601\uc5ed(Method Area, \ud638\ucd9c\uc2a4\ud0dd, Heap)\uc5d0 \ub300\ud574\uc11c \uc54c\uc544\ubcf4\ub3c4\ub85d \ud558\uc790.<\/p>\n

\"JVM\uba54\ubaa8\ub9ac(Method<\/a><\/p>\n

[\ucc38\uace0] cv\ub294 \ud074\ub798\uc2a4\ubcc0\uc218, lv\ub294 \uc9c0\uc5ed\ubcc0\uc218, iv\ub294 \uc778\uc2a4\ud134\uc2a4\ubcc0\uc218\ub97c \ub73b\ud55c\ub2e4.<\/p>\n

1. \uba54\uc18c\ub4dc\uc601\uc5ed(Method Area)
\n– \ud504\ub85c\uadf8\ub7a8 \uc2e4\ud589 \uc911 \uc5b4\ub5a4 \ud074\ub798\uc2a4\uac00 \uc0ac\uc6a9\ub418\uba74, JVM\uc740 \ud574\ub2f9 \ud074\ub798\uc2a4\uc758 \ud074\ub798\uc2a4\ud30c\uc77c(*.class)\uc744 \uc77d\uc5b4\uc11c \ubd84\uc11d\ud558\uc5ec \ud074\ub798\uc2a4\uc5d0 \ub300\ud55c \uc815\ubcf4(\ud074\ub798\uc2a4 \ub370\uc774\ud0c0)\ub97c Method Area\uc5d0 \uc800\uc7a5\ud55c\ub2e4.
\n\uc774 \ub54c, \uadf8 \ud074\ub798\uc2a4\uc758 \ud074\ub798\uc2a4\ubcc0\uc218(class variable)\ub3c4 \uc774 \uc601\uc5ed\uc5d0 \ud568\uaed8 \uc0dd\uc131\ub41c\ub2e4.<\/p>\n

2. \ud799(Heap)
\n– \uc778\uc2a4\ud134\uc2a4\uac00 \uc0dd\uc131\ub418\ub294 \uacf5\uac04. \ud504\ub85c\uadf8\ub7a8 \uc2e4\ud589 \uc911 \uc0dd\uc131\ub418\ub294 \uc778\uc2a4\ud134\uc2a4\ub294 \ubaa8\ub450 \uc774 \uacf3\uc5d0 \uc0dd\uc131\ub41c\ub2e4. \uc989, \uc778\uc2a4\ud134\uc2a4\ubcc0\uc218(instance variable)\ub4e4\uc774 \uc0dd\uc131\ub418\ub294 \uacf5\uac04\uc774\ub2e4.<\/p>\n

3. \ud638\ucd9c\uc2a4\ud0dd(Call Stack \ub610\ub294 Execution Stack)
\n\ud638\ucd9c\uc2a4\ud0dd\uc740 \uba54\uc11c\ub4dc\uc758 \uc791\uc5c5\uc5d0 \ud544\uc694\ud55c \uba54\ubaa8\ub9ac \uacf5\uac04\uc744 \uc81c\uacf5\ud55c\ub2e4. \uba54\uc11c\ub4dc\uac00 \ud638\ucd9c\ub418\uba74, \ud638\ucd9c\uc2a4\ud0dd\uc5d0 \ud638\ucd9c\ub41c \uba54\uc11c\ub4dc\ub97c \uc704\ud55c \uba54\ubaa8\ub9ac\uac00 \ud560\ub2f9\ub418\uba70, \uc774 \uba54\ubaa8\ub9ac\ub294 \uba54\uc11c\ub4dc\uac00 \uc791\uc5c5\uc744 \uc218\ud589\ud558\ub294 \ub3d9\uc548 \uc9c0\uc5ed\ubcc0\uc218(\ub9e4\uac1c\ubcc0\uc218 \ud3ec\ud568)\ub4e4\uacfc \uc5f0\uc0b0\uc758 \uc911\uac04\uacb0\uacfc \ub4f1\uc744 \uc800\uc7a5\ud558\ub294\ub370 \uc0ac\uc6a9\ub41c\ub2e4. \uadf8\ub9ac\uace0, \uba54\uc11c\ub4dc\uac00 \uc791\uc5c5\uc744 \ub9c8\uce58\uac8c \ub418\uba74, \ud560\ub2f9\ub418\uc5c8\ub358 \uba54\ubaa8\ub9ac\uacf5\uac04\uc740 \ubc18\ud658\ub418\uc5b4 \ube44\uc6cc\uc9c4\ub2e4.
\n\uac01 \uba54\uc11c\ub4dc\ub97c \uc704\ud55c \uba54\ubaa8\ub9ac\uc0c1\uc758 \uc791\uc5c5\uacf5\uac04\uc740 \uc11c\ub85c \uad6c\ubcc4\ub418\uba70, \uccab \ubc88\uc9f8\ub85c \ud638\ucd9c\ub41c \uba54\uc11c\ub4dc\ub97c \uc704\ud55c \uc791\uc5c5\uacf5\uac04\uc774 \ud638\ucd9c\uc2a4\ud0dd\uc758 \ub9e8 \ubc11\uc5d0 \ub9c8\ub828\ub418\uace0, \uccab \ubc88\uc9f8 \uba54\uc11c\ub4dc \uc218\ud589\uc911\uc5d0 \ub2e4\ub978 \uba54\uc11c\ub4dc\ub97c \ud638\ucd9c\ud558\uac8c \ub418\uba74, \uccab \ubc88\uc9f8 \uba54\uc11c\ub4dc\uc758 \ubc14\ub85c \uc704\uc5d0 \ub450 \ubc88\uc9f8\ub85c \ud638\ucd9c\ub41c \uba54\uc11c\ub4dc\ub97c \uc704\ud55c \uacf5\uac04\uc774 \ub9c8\ub828\ub41c\ub2e4.
\n\uc774 \ub54c \uccab \ubc88\uc9f8 \uba54\uc11c\ub4dc\ub294 \uc218\ud589\uc744 \uba48\ucd94\uace0, \ub450 \ubc88\uc9f8 \uba54\uc11c\ub4dc\uac00 \uc218\ud589\ub418\uae30 \uc2dc\uc791\ud55c\ub2e4. \ub450 \ubc88\uc9f8\ub85c \ud638\ucd9c\ub41c \uba54\uc11c\ub4dc\uac00 \uc218\ud589\uc744 \ub9c8\uce58\uac8c \ub418\uba74, \ub450 \ubc88\uc9f8 \uba54\uc11c\ub4dc\ub97c \uc704\ud574 \uc81c\uacf5\ub418\uc5c8\ub358 \ud638\ucd9c\uc2a4\ud0dd\uc758 \uba54\ubaa8\ub9ac\uacf5\uac04\uc774 \ubc18\ud658\ub418\uba70, \uccab \ubc88\uc9f8 \uba54\uc11c\ub4dc\ub294 \ub2e4\uc2dc \uc218\ud589\uc744 \uacc4\uc18d\ud558\uac8c \ub41c\ub2e4. \uccab \ubc88\uc9f8 \uba54\uc11c\ub4dc\uac00 \uc218\ud589\uc744 \ub9c8\uce58\uba74, \uc5ed\uc2dc \uc81c\uacf5\ub418\uc5c8\ub358 \uba54\ubaa8\ub9ac \uacf5\uac04\uc774 \ud638\ucd9c\uc2a4\ud0dd\uc5d0\uc11c \uc81c\uac70\ub418\uba70 \ud638\ucd9c\uc2a4\ud0dd\uc740 \uc644\uc804\ud788 \ube44\uc6cc\uc9c0\uac8c \ub41c\ub2e4.
\n\ud638\ucd9c\uc2a4\ud0dd\uc758 \uc81c\uc77c \uc0c1\uc704\uc5d0 \uc704\uce58\ud558\ub294 \uba54\uc11c\ub4dc\uac00 \ud604\uc7ac \uc2e4\ud589 \uc911\uc778 \uba54\uc11c\ub4dc\uc774\uba70, \ub098\uba38\uc9c0\ub294 \ub300\uae30\uc0c1\ud0dc\uc5d0 \uc788\uac8c \ub41c\ub2e4.
\n\ub530\ub77c\uc11c, \ud638\ucd9c\uc2a4\ud0dd\uc744 \uc870\uc0ac\ud574 \ubcf4\uba74 \uba54\uc11c\ub4dc \uac04\uc758 \ud638\ucd9c\uad00\uacc4\uc640 \ud604\uc7ac \uc218\ud589\uc911\uc778 \uba54\uc11c\ub4dc\uac00 \uc5b4\ub290 \uac83\uc778\uc9c0 \uc54c \uc218 \uc788\ub2e4.<\/p>\n

\ud638\ucd9c\uc2a4\ud0dd\uc758 \ud2b9\uc9d5\uc744 \uc694\uc57d\ud574\ubcf4\uba74 \ub2e4\uc74c\uacfc \uac19\ub2e4.
\n– \uc5b8\uc81c\ub098 \ud638\ucd9c\uc2a4\ud0dd\uc758 \uc81c\uc77c \uc704\uc5d0 \uc788\ub294 \uba54\uc11c\ub4dc\uac00 \ud604\uc7ac \uc2e4\ud589 \uc911\uc778 \uba54\uc11c\ub4dc\uc774\ub2e4.
\n– \uc544\ub798\uc5d0 \uc788\ub294 \uba54\uc11c\ub4dc\uac00 \ubc14\ub85c \uc704\uc758 \uba54\uc11c\ub4dc\ub97c \ud638\ucd9c\ud55c \uba54\uc11c\ub4dc\uc774\ub2e4.<\/p>\n

\ubc18\ud658\ud0c0\uc785(return type)\uc774 \uc788\ub294 \uba54\uc11c\ub4dc\ub294 \uc885\ub8cc\ub418\uba74\uc11c \uacb0\uacfc\uac12\uc744 \uc790\uc2e0\uc744 \ud638\ucd9c\ud55c \uba54\uc11c\ub4dc(caller)\uc5d0\uac8c \ubc18\ud658\ud55c\ub2e4. \ub300\uae30\uc0c1\ud0dc\uc5d0 \uc788\ub358 \ud638\ucd9c\ud55c \uba54\uc11c\ub4dc(caller)\ub294 \ub118\uaca8\ubc1b\uc740 \ubc18\ud658\uac12\uc73c\ub85c \uc218\ud589\uc744 \uacc4\uc18d \uc9c4\ud589\ud558\uac8c \ub41c\ub2e4.<\/p>\n

[\uc608\uc81c6-6] CallStackTest.java<\/p>\n

class CallStackTest { \r\n      public static void main(String[] args) { \r\n            firstMethod(); \r\n      } \r\n\r\n      static void firstMethod() { \r\n            secondMethod(); \r\n      } \r\n\r\n      static void secondMethod() { \r\n            System.out.println(\"secondMethod()\");             \r\n      } \r\n} <\/pre>\n
[\uc2e4\ud589\uacb0\uacfc]
\nsecondMethod()<\/p>\n
\uc704\uc758 \uc608\uc81c\ub97c \uc2e4\ud589\uc2dc\ucf30\uc744 \ub54c, \ud504\ub85c\uadf8\ub7a8\uc774 \uc218\ud589\ub418\ub294 \ub3d9\uc548 \ud638\ucd9c\uc2a4\ud0dd\uc758 \ubcc0\ud654\ub97c \uadf8\ub9bc\uacfc \ud568\uaed8 \uc0b4\ud3b4\ubcf4\ub3c4\ub85d \ud558\uc790<\/p>\n
\"\ud638\ucd9c\uc2dccallstack\uc758<\/a><\/p>\n
(1)~(2) \uc704\uc758 \uc608\uc81c\ub97c \ucef4\ud30c\uc77c\ud55c \ud6c4 \uc2e4\ud589\uc2dc\ud0a4\uba74, JVM\uc5d0 \uc758\ud574\uc11c main\uba54\uc11c\ub4dc\uac00 \ud638\ucd9c\ub428\uc73c\ub85c\uc368 \ud504\ub85c\uadf8\ub7a8\uc774 \uc2dc\uc791\ub41c\ub2e4. \uc774\ub54c, \ud638\ucd9c\uc2a4\ud0dd\uc5d0\ub294 main\uba54\uc11c\ub4dc\ub97c \uc704\ud55c \uba54\ubaa8\ub9ac\uacf5\uac04\uc774 \ud560\ub2f9\ub418\uace0 main\uba54\uc11c\ub4dc\uc758 \ucf54\ub4dc\uac00 \uc218\ud589\ub418\uae30 \uc2dc\uc791\ud55c\ub2e4.
\n(3) main\uba54\uc11c\ub4dc\uc5d0\uc11c firstMethod()\ub97c \ud638\ucd9c\ud55c \uc0c1\ud0dc\uc774\ub2e4. \uc544\uc9c1 main\uba54\uc11c\ub4dc\uac00 \ub05d\ub09c \uac83\uc740 \uc544\ub2c8\ubbc0\ub85c main\uba54\uc11c\ub4dc\ub294 \ud638\ucd9c\uc2a4\ud0dd\uc5d0 \ub300\uae30\uc0c1\ud0dc\ub85c \ub0a8\uc544\uc788\uace0 firstMethod()\uc758 \uc218\ud589\uc774 \uc2dc\uc791\ub41c\ub2e4.
\n(4) firstMethod()\uc5d0\uc11c \ub2e4\uc2dc secondMethod()\ub97c \ud638\ucd9c\ud588\ub2e4. firstMethod()\ub294 secondMethod()\uac00 \uc218\ud589\uc744 \ub9c8\uce60 \ub54c\uae4c\uc9c0 \ub300\uae30\uc0c1\ud0dc\uc5d0 \uc788\uac8c \ub41c\ub2e4. seoundMethod()\uac00 \uc218\ud589\uc744 \ub9c8\uccd0\uc57c firstMethod()\uc758 \ub098\uba38\uc9c0 \ubb38\uc7a5\ub4e4\uc744 \uc218\ud589\ud560 \uc218 \uc788\uae30 \ub54c\ubb38\uc774\ub2e4.
\n(5) secondMethod()\uc5d0\uc11c println\uba54\uc11c\ub4dc\ub97c \ud638\ucd9c\ud588\ub2e4. \uc774\ub54c, println\uba54\uc11c\ub4dc\uc5d0 \uc758\ud574\uc11c \ud654\uba74\uc5d0 “secondMethod()”\uac00 \ucd9c\ub825\ub41c\ub2e4.
\n(6) println\uba54\uc11c\ub4dc\uc758 \uc218\ud589\uc774 \uc644\ub8cc\ub418\uc5b4 \ud638\ucd9c\uc2a4\ud0dd\uc5d0\uc11c \uc0ac\ub77c\uc9c0\uace0 \uc790\uc2e0\uc744 \ud638\ucd9c\ud55c secondMethod()\ub85c \ub418\ub3cc\uc544\uac04\ub2e4. \ub300\uae30 \uc911\uc774\ub358 secondMethod()\ub294 println\uba54\uc11c\ub4dc\ub97c \ud638\ucd9c\ud55c \uc774\ud6c4\ubd80\ud130 \uc218\ud589\uc744 \uc7ac\uac1c\ud55c\ub2e4.
\n(7) secondMethod()\uc5d0 \ub354 \uc774\uc0c1 \uc218\ud589\ud560 \ucf54\ub4dc\uac00 \uc5c6\uc73c\ubbc0\ub85c \uc885\ub8cc\ub418\uace0, \uc790\uc2e0\uc744 \ud638\ucd9c\ud55c firstMethod()\ub85c \ub3cc\uc544\uac04\ub2e4.
\n(8) firstMethod()\uc5d0\ub3c4 \ub354 \uc774\uc0c1 \uc218\ud589\ud560 \ucf54\ub4dc\uac00 \uc5c6\uc73c\ubbc0\ub85c \uc885\ub8cc\ub418\uace0, \uc790\uc2e0\uc744 \ud638\ucd9c\ud55c main\uba54\uc11c\ub4dc\ub85c \ub3cc\uc544\uac04\ub2e4.
\n(9) main\uba54\uc11c\ub4dc\uc5d0\ub3c4 \ub354 \uc774\uc0c1 \uc218\ud589\ud560 \ucf54\ub4dc\uac00 \uc5c6\uc73c\ubbc0\ub85c \uc885\ub8cc\ub418\uc5b4, \ud638\ucd9c\uc2a4\ud0dd\uc740 \uc644\uc804\ud788 \ube44\uc6cc\uc9c0\uac8c \ub418\uace0 \ud504\ub85c\uadf8\ub7a8\uc740 \uc885\ub8cc\ub41c\ub2e4.<\/p>\n
[\uc608\uc81c6-7] CallStackTest2.java<\/p>\n
class CallStackTest2 { \r\n      public static void main(String[] args) { \r\n            System.out.println(\"main(String[] args)\uc774 \uc2dc\uc791\ub418\uc5c8\uc74c.\"); \r\n            firstMethod(); \r\n            System.out.println(\"main(String[] args)\uc774 \ub05d\ub0ac\uc74c.\"); \r\n     } \r\n      static void firstMethod() { \r\n            System.out.println(\"firstMethod()\uc774 \uc2dc\uc791\ub418\uc5c8\uc74c.\"); \r\n            secondMethod(); \r\n            System.out.println(\"firstMethod()\uc774 \ub05d\ub0ac\uc74c.\");             \r\n     } \r\n\r\n      static void secondMethod() { \r\n            System.out.println(\"secondMethod()\uc774 \uc2dc\uc791\ub418\uc5c8\uc74c.\"); \r\n            System.out.println(\"secondMethod()\uc774 \ub05d\ub0ac\uc74c.\");             \r\n     } \r\n\r\n} <\/pre>\n
[\uc2e4\ud589\uacb0\uacfc]
\nmain(String[] args)\uc774 \uc2dc\uc791\ub418\uc5c8\uc74c.
\nfirstMethod()\uc774 \uc2dc\uc791\ub418\uc5c8\uc74c.
\nsecondMethod()\uc774 \uc2dc\uc791\ub418\uc5c8\uc74c.
\nsecondMethod()\uc774 \ub05d\ub0ac\uc74c.
\nfirstMethod()\uc774 \ub05d\ub0ac\uc74c.
\nmain(String[] args)\uc774 \ub05d\ub0ac\uc74c.<\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
  JVM\uc758 \uba54\ubaa8\ub9ac \uad6c\uc870\ub97c \uc880 \uc54c\uc544\ub458 \ud544\uc694\uac00 \uc0dd\uaca8\uc11c \ucc3e\uc544\ubd24\ub2e4. \uc751\uc6a9\ud504\ub85c\uadf8\ub7a8\uc774 \uc2e4\ud589\ub418\uba74, JVM\uc740 \uc2dc\uc2a4\ud15c\uc73c\ub85c\ubd80\ud130 \ud504\ub85c\uadf8\ub7a8\uc744 \uc218\ud589\ud558\ub294\ub370 \ud544\uc694\ud55c \uba54\ubaa8\ub9ac\ub97c \ud560\ub2f9\ubc1b\uace0 JVM\uc740 \uc774 \uba54\ubaa8\ub9ac\ub97c \uc6a9\ub3c4\uc5d0 \ub530\ub77c \uc5ec\ub7ec \uc601\uc5ed\uc73c\ub85c \ub098\ub204\uc5b4 \uad00\ub9ac\ud55c\ub2e4. \uadf8 \uc911 3\uac00\uc9c0 \uc8fc\uc694\uc601\uc5ed(Method Area, \ud638\ucd9c\uc2a4\ud0dd, Heap)\uc5d0 \ub300\ud574\uc11c \uc54c\uc544\ubcf4\ub3c4\ub85d \ud558\uc790. [\ucc38\uace0] cv\ub294 \ud074\ub798\uc2a4\ubcc0\uc218, … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[662],"tags":[411,958,96,959],"class_list":["post-146","post","type-post","status-publish","format-standard","hentry","category-java-jsp","tag-jvm","tag-958","tag-java","tag-959"],"yoast_head":"\nJVM\uc758 \uba54\ubaa8\ub9ac \uad6c\uc870\uc640 \ud638\ucd9c\uc2a4\ud0dd - Apollo89.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/apollo89.com\/wordpress\/?p=146\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JVM\uc758 \uba54\ubaa8\ub9ac \uad6c\uc870\uc640 \ud638\ucd9c\uc2a4\ud0dd - Apollo89.com\" \/>\n<meta property=\"og:description\" content=\"  JVM\uc758 \uba54\ubaa8\ub9ac \uad6c\uc870\ub97c \uc880 \uc54c\uc544\ub458 \ud544\uc694\uac00 \uc0dd\uaca8\uc11c \ucc3e\uc544\ubd24\ub2e4. \uc751\uc6a9\ud504\ub85c\uadf8\ub7a8\uc774 \uc2e4\ud589\ub418\uba74, JVM\uc740 \uc2dc\uc2a4\ud15c\uc73c\ub85c\ubd80\ud130 \ud504\ub85c\uadf8\ub7a8\uc744 \uc218\ud589\ud558\ub294\ub370 \ud544\uc694\ud55c \uba54\ubaa8\ub9ac\ub97c \ud560\ub2f9\ubc1b\uace0 JVM\uc740 \uc774 \uba54\ubaa8\ub9ac\ub97c \uc6a9\ub3c4\uc5d0 \ub530\ub77c \uc5ec\ub7ec \uc601\uc5ed\uc73c\ub85c \ub098\ub204\uc5b4 \uad00\ub9ac\ud55c\ub2e4. \uadf8 \uc911 3\uac00\uc9c0 \uc8fc\uc694\uc601\uc5ed(Method Area, \ud638\ucd9c\uc2a4\ud0dd, Heap)\uc5d0 \ub300\ud574\uc11c \uc54c\uc544\ubcf4\ub3c4\ub85d \ud558\uc790. 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