{"id":1695,"date":"2026-05-21T22:23:13","date_gmt":"2026-05-21T22:23:13","guid":{"rendered":"https:\/\/wayhope.kro.kr\/?p=1695"},"modified":"2026-08-31T07:32:44","modified_gmt":"2026-08-31T07:32:44","slug":"java-%ec%96%b8%ec%96%b4-%ed%95%b5%ec%8b%ac-%ec%a0%95%eb%a6%ac","status":"publish","type":"post","link":"https:\/\/wayhope.kro.kr\/?p=1695","title":{"rendered":"Java \uc5b8\uc5b4 \ud575\uc2ec \uc815\ub9ac"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Java\ub294 \uac1d\uccb4\uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d\uc744 \uc911\uc2ec\uc73c\ub85c \uc124\uacc4\ub41c \ubc94\uc6a9 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\ub2e4. 1995\ub144 \ucc98\uc74c \uacf5\uac1c\ub41c \uc774\ud6c4 \uc6f9 \uc11c\ubc84, \uae30\uc5c5\uc6a9 \uc560\ud50c\ub9ac\ucf00\uc774\uc158, Android, \uae08\uc735 \uc2dc\uc2a4\ud15c, \ub300\uaddc\ubaa8 \ubc31\uc5d4\ub4dc \ub4f1 \ub2e4\uc591\ud55c \ubd84\uc57c\uc5d0\uc11c \uc0ac\uc6a9\ub418\uc5b4 \uc654\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc758 \uac00\uc7a5 \ud070 \ud2b9\uc9d5\uc740 JVM(Java Virtual Machine)\uc744 \uc911\uc2ec\uc73c\ub85c \ud55c \uc2e4\ud589 \ud658\uacbd\uc774\ub2e4. Java \uc18c\uc2a4 \ucf54\ub4dc\ub294 \ubc14\uc774\ud2b8\ucf54\ub4dc\ub85c \ucef4\ud30c\uc77c\ub418\uace0 JVM\uc774 \uc774\ub97c \uc2e4\ud589\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Java Source -&gt; Java Compiler -&gt; Bytecode -&gt; JVM -&gt; Machine Code\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774 \uad6c\uc870 \ub355\ubd84\uc5d0 \uc6b4\uc601\uccb4\uc81c\uc5d0 \uc885\uc18d\ub41c \ub124\uc774\ud2f0\ube0c \uc2e4\ud589 \ud30c\uc77c\uc744 \uc9c1\uc811 \ub9cc\ub4dc\ub294 \ubc29\uc2dd\uacfc \ube44\uad50\ud558\uba74 \ud50c\ub7ab\ud3fc \ub3c5\ub9bd\uc131\uc774 \ub192\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java\ub97c \uc774\ud574\ud558\ub824\uba74 \ubb38\ubc95 \uc790\uccb4\ubcf4\ub2e4 <strong>\uac1d\uccb4\uc9c0\ud5a5 \uad6c\uc870, \ud0c0\uc785 \uc2dc\uc2a4\ud15c, JVM, \uba54\ubaa8\ub9ac \uad00\ub9ac, \uc608\uc678 \ucc98\ub9ac, \uceec\ub809\uc158, \ub3d9\uc2dc\uc131<\/strong>\uc744 \ud568\uaed8 \uc774\ud574\ud558\ub294 \uac83\uc774 \uc911\uc694\ud558\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Java\uc758 \uae30\ubcf8 \uad6c\uc870<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\uac00\uc7a5 \uae30\ubcf8\uc801\uc778 Java \ud504\ub85c\uadf8\ub7a8\uc740 \ub2e4\uc74c\uacfc \uac19\uc774 \uc791\uc131\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Main\n{\n    public static void main(String&#91;] args)\n    {\n        int value = 10;\n\n        System.out.println(value);\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>main()<\/code>\uc774 \uc77c\ubc18\uc801\uc778 Java \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \uc2dc\uc791\uc810\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java \uc18c\uc2a4 \ud30c\uc77c\uc740 <code>.java<\/code> \ud30c\uc77c\ub85c \uc791\uc131\ud558\uace0 <code>javac<\/code> \ucef4\ud30c\uc77c\ub7ec\ub97c \uc0ac\uc6a9\ud574 \ubc14\uc774\ud2b8\ucf54\ub4dc\ub85c \ubcc0\ud658\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Main.java -&gt; javac -&gt; Main.class -&gt; JVM\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>.class<\/code> \ud30c\uc77c\uc5d0\ub294 JVM\uc774 \uc774\ud574\ud560 \uc218 \uc788\ub294 \ubc14\uc774\ud2b8\ucf54\ub4dc\uac00 \ub4e4\uc5b4\uac04\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">JVM\uc740 \uc774 \ubc14\uc774\ud2b8\ucf54\ub4dc\ub97c \ud574\uc11d\ud558\uac70\ub098 JIT(Just-In-Time) \ucef4\ud30c\uc77c\uc744 \ud1b5\ud574 \ub124\uc774\ud2f0\ube0c \ucf54\ub4dc\ub85c \ubcc0\ud658\ud558\uc5ec \uc2e4\ud589\ud55c\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ubcc0\uc218\uc640 \ud0c0\uc785<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\ub294 \uc815\uc801 \ud0c0\uc785 \uc5b8\uc5b4\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int health = 100;\nfloat speed = 3.5f;\ndouble distance = 100.0;\nboolean alive = true;\nchar grade = 'A';\nString name = \"Player\";\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ub300\ud45c\uc801\uc778 \uae30\ubcf8 \ud0c0\uc785\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>byte \/ short \/ int \/ long \/ float \/ double \/ char \/ boolean\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774 \ud0c0\uc785\ub4e4\uc740 Java\uc758 primitive type\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ubc18\uba74 <code>String<\/code>, \ubc30\uc5f4, \ud074\ub798\uc2a4 \ub4f1\uc740 \uac1d\uccb4\ub97c \uc0ac\uc6a9\ud558\ub294 reference type\uc774\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Primitive Type\uacfc Reference Type<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc5d0\uc11c \ud0c0\uc785\uc744 \uc774\ud574\ud560 \ub54c \uc911\uc694\ud55c \uad6c\ubd84\uc774\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int a = 10;\nint b = a;\n\nb = 20;\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774 \uacbd\uc6b0 <code>a<\/code>\ub294 \uadf8\ub300\ub85c <code>10<\/code>\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ubc18\uba74 \uac1d\uccb4\ub97c \ucc38\uc870\ud558\ub294 \uacbd\uc6b0\uc5d0\ub294 \ucc38\uc870\uac12\uc774 \ubcf5\uc0ac\ub41c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Player a = new Player();\nPlayer b = a;\n\nb.health = 0;\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>a<\/code>\uc640 <code>b<\/code>\uac00 \uac19\uc740 <code>Player<\/code> \uac1d\uccb4\ub97c \uac00\ub9ac\ud0a4\uae30 \ub54c\ubb38\uc5d0 <code>a.health<\/code>\ub3c4 <code>0<\/code>\uc774 \ub41c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc5d0\uc11c\ub294 \ud754\ud788 primitive type\uacfc reference type\uc744 \uad6c\ubd84\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Primitive Type -&gt; \uac12 \uc790\uccb4\ub97c \ud45c\ud604\nReference Type -&gt; \uac1d\uccb4\uc5d0 \ub300\ud55c \ucc38\uc870\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\ub9cc Java\uc758 \uba54\ubaa8\ub9ac \uad6c\uc870\ub97c \ub2e8\uc21c\ud788 <code>primitive = stack<\/code>, <code>object = heap<\/code>\uc73c\ub85c \uc678\uc6b0\ub294 \uac83\uc740 \uc815\ud655\ud558\uc9c0 \uc54a\ub2e4. \uc2e4\uc81c JVM\uc758 \uad6c\ud604\uacfc \ucd5c\uc801\ud654\uc5d0 \ub530\ub77c \uad6c\uccb4\uc801\uc778 \uba54\ubaa8\ub9ac \ubc30\uce58\ub294 \ub2ec\ub77c\uc9c8 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud074\ub798\uc2a4\uc640 \uac1d\uccb4<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\ub294 \uac1d\uccb4\uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d\uc744 \uc911\uc2ec\uc73c\ub85c \uc124\uacc4\ub418\uc5b4 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Player\n{\n    int health;\n\n    void attack()\n    {\n        System.out.println(\"Attack\");\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud074\ub798\uc2a4\ub97c \uc774\uc6a9\ud574 \uac1d\uccb4\ub97c \uc0dd\uc131\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Player player = new Player();\n\nplayer.health = 100;\nplayer.attack();\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud074\ub798\uc2a4\ub294 \uac1d\uccb4\uac00 \uac00\uc838\uc57c \ud560 \uc0c1\ud0dc\uc640 \ub3d9\uc791\uc744 \uc815\uc758\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uac8c\uc784\uc744 \uc608\ub85c \ub4e4\uba74 \ub2e4\uc74c\uacfc \uac19\uc774 \uad6c\uc131\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Player -&gt; health \/ position \/ attack() \/ move()\nMonster -&gt; health \/ position \/ attack() \/ move()\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc2e4\uc81c \uac1d\uccb4\uc9c0\ud5a5 \uc124\uacc4\uc5d0\uc11c\ub294 \ub370\uc774\ud130\ub97c \ub2e8\uc21c\ud788 \ubaa8\uc544\ub193\ub294 \uac83\ubcf4\ub2e4 \uac1d\uccb4\uac00 \uc790\uc2e0\uc758 \uc0c1\ud0dc\ub97c \uc5b4\ub5a4 \ubc29\uc2dd\uc73c\ub85c \ubcc0\uacbd\ud558\uace0 \uc678\ubd80\uc5d0 \uc5b4\ub5a4 \uae30\ub2a5\uc744 \uc81c\uacf5\ud558\ub294\uc9c0\uae4c\uc9c0 \ud568\uaed8 \uc124\uacc4\ud55c\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\uc0dd\uc131\uc790<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\uac1d\uccb4\uac00 \uc0dd\uc131\ub420 \ub54c \ud638\ucd9c\ub418\ub294 \uba54\uc11c\ub4dc\uac00 \uc0dd\uc131\uc790\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Player\n{\n    private int health;\n\n    public Player(int health)\n    {\n        this.health = health;\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uac1d\uccb4\ub97c \uc0dd\uc131\ud558\uba74 \uc0dd\uc131\uc790\uac00 \ud638\ucd9c\ub41c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Player player = new Player(100);\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>this<\/code>\ub294 \ud604\uc7ac \uac1d\uccb4\ub97c \uac00\ub9ac\ud0a8\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>this.health = health;\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc5ec\uae30\uc11c\ub294 \ud544\ub4dc <code>health<\/code>\uc640 \uc0dd\uc131\uc790\uc758 \ub9e4\uac1c\ubcc0\uc218 <code>health<\/code>\ub97c \uad6c\ubd84\ud558\uae30 \uc704\ud574 \uc0ac\uc6a9\ud588\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\uc811\uadfc \uc81c\uc5b4\uc790<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\ub294 \ud074\ub798\uc2a4\uc640 \uba64\ubc84\uc758 \uc811\uadfc \ubc94\uc704\ub97c \uc81c\ud55c\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub300\ud45c\uc801\uc73c\ub85c \ub2e4\uc74c\uc774 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public \/ protected \/ private \/ package-private\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc608\ub97c \ub4e4\uc5b4:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Player\n{\n    private int health;\n\n    public void damage(int amount)\n    {\n        health -= amount;\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc678\ubd80\uc5d0\uc11c\ub294 <code>health<\/code>\uc5d0 \uc9c1\uc811 \uc811\uadfc\ud560 \uc218 \uc5c6\uace0 <code>damage()<\/code>\ub97c \ud1b5\ud574 \uc0c1\ud0dc\ub97c \ubcc0\uacbd\ud558\ub3c4\ub85d \ub9cc\ub4e4 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ub7f0 \ubc29\uc2dd\uc73c\ub85c \uac1d\uccb4\uc758 \ub0b4\ubd80 \uad6c\ud604\uc744 \uc228\uae30\uace0 \uc678\ubd80\uc5d0 \ud544\uc694\ud55c \uc778\ud130\ud398\uc774\uc2a4\ub9cc \uc81c\uacf5\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\uc0c1\uc18d<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\ub294 \ud074\ub798\uc2a4\ub97c \uc0c1\uc18d\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Animal\n{\n    void speak()\n    {\n        System.out.println(\"Animal\");\n    }\n}\n\nclass Dog extends Animal\n{\n    @Override\n    void speak()\n    {\n        System.out.println(\"Dog\");\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\uc81c <code>Dog<\/code>\ub294 <code>Animal<\/code>\uc758 \uae30\ub2a5\uc744 \uc0c1\uc18d\ubc1b\ub294\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Animal animal = new Dog();\n\nanimal.speak();\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc2e4\ud589 \uacb0\uacfc\ub294 <code>Dog<\/code>\uac00 \ub41c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\uac83\uc774 \ub7f0\ud0c0\uc784 \ub2e4\ud615\uc131\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc5d0\uc11c\ub294 \ud074\ub798\uc2a4\uc758 \ub2e4\uc911 \uc0c1\uc18d\uc744 \ud5c8\uc6a9\ud558\uc9c0 \uc54a\ub294\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Dog extends Animal\n{\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud558\ub098\uc758 \ud074\ub798\uc2a4\ub9cc \uc0c1\uc18d\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc5ec\ub7ec \ud0c0\uc785\uc758 \uae30\ub2a5\uc744 \uc870\ud569\ud560 \ub54c\ub294 \uc778\ud130\ud398\uc774\uc2a4\ub97c \uc0ac\uc6a9\ud558\ub294 \ubc29\uc2dd\uc774 \uc77c\ubc18\uc801\uc774\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\uc778\ud130\ud398\uc774\uc2a4<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\uc778\ud130\ud398\uc774\uc2a4\ub294 \uac1d\uccb4\uac00 \uc5b4\ub5a4 \uae30\ub2a5\uc744 \uc81c\uacf5\ud574\uc57c \ud558\ub294\uc9c0\ub97c \uc815\uc758\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>interface Damageable\n{\n    void takeDamage(int damage);\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc5ec\ub7ec \ud074\ub798\uc2a4\uac00 \uc774\ub97c \uad6c\ud604\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Player implements Damageable\n{\n    @Override\n    public void takeDamage(int damage)\n    {\n    }\n}\n\nclass Monster implements Damageable\n{\n    @Override\n    public void takeDamage(int damage)\n    {\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uadf8\ub7ec\uba74 \uad6c\uccb4\uc801\uc778 \ud074\ub798\uc2a4\uac00 \ubb34\uc5c7\uc778\uc9c0 \ubab0\ub77c\ub3c4 <code>Damageable<\/code>\uc744 \ud1b5\ud574 \uacf5\ud1b5 \uae30\ub2a5\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>void applyDamage(Damageable target)\n{\n    target.takeDamage(10);\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc0c1\uc18d\uc774 &#8220;\ubb34\uc5c7\uc778\uac00&#8221;\ub77c\ub294 \ud0c0\uc785 \uad00\uacc4\ub97c \ud45c\ud604\ud558\ub294 \ub370 \uc801\ud569\ud558\ub2e4\uba74 \uc778\ud130\ud398\uc774\uc2a4\ub294 &#8220;\ubb34\uc5c7\uc744 \ud560 \uc218 \uc788\ub294\uac00&#8221;\ub77c\ub294 \uae30\ub2a5\uc801 \uacc4\uc57d\uc744 \ud45c\ud604\ud558\ub294 \ub370 \uc720\uc6a9\ud558\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">final<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>final<\/code>\uc740 \ubcc0\uacbd\ud560 \uc218 \uc5c6\ub2e4\ub294 \uc758\ubbf8\ub97c \uc0c1\ud669\uc5d0 \ub530\ub77c \ud45c\ud604\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ubcc0\uc218\uc5d0\uc11c\ub294 \uac12\uc744 \ub2e4\uc2dc \ud560\ub2f9\ud558\uc9c0 \ubabb\ud558\uac8c \ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>final int MAX_HEALTH = 100;\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uba54\uc11c\ub4dc\uc5d0 \uc0ac\uc6a9\ud558\uba74 \uc624\ubc84\ub77c\uc774\ub529\ud560 \uc218 \uc5c6\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>final void attack()\n{\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud074\ub798\uc2a4\uc5d0 \uc0ac\uc6a9\ud558\uba74 \uc0c1\uc18d\ud560 \uc218 \uc5c6\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>final class Player\n{\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ubd88\ubcc0 \uac1d\uccb4\ub97c \uc124\uacc4\ud560 \ub54c\ub3c4 \uc790\uc8fc \uc0ac\uc6a9\ud55c\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">static<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>static<\/code>\uc740 \ud2b9\uc815 \uac1d\uccb4\uc5d0 \uc18d\ud558\uc9c0 \uc54a\uace0 \ud074\ub798\uc2a4\uc5d0 \uc18d\ud558\ub294 \uba64\ubc84\ub97c \ub9cc\ub4e4 \ub54c \uc0ac\uc6a9\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class MathUtil\n{\n    static int add(int a, int b)\n    {\n        return a + b;\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uac1d\uccb4\ub97c \uc0dd\uc131\ud558\uc9c0 \uc54a\uace0 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int result = MathUtil.add(10, 20);\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>main()<\/code>\ub3c4 <code>static<\/code>\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">JVM\uc774 <code>Main<\/code> \uac1d\uccb4\ub97c \uba3c\uc800 \uc0dd\uc131\ud558\uc9c0 \uc54a\uace0 \ud504\ub85c\uadf8\ub7a8\uc758 \uc2dc\uc791 \uba54\uc11c\ub4dc\ub97c \ud638\ucd9c\ud560 \uc218 \uc788\ub3c4\ub85d \ud558\uae30 \uc704\ud574\uc11c\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ubc30\uc5f4<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc758 \ubc30\uc5f4\uc740 \uac19\uc740 \ud0c0\uc785\uc758 \ub370\uc774\ud130\ub97c \uace0\uc815\ub41c \ud06c\uae30\ub85c \uc800\uc7a5\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] scores = new int&#91;10];\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ucd08\uae30\uac12\uc744 \uc9c1\uc811 \uc9c0\uc815\ud560 \uc218\ub3c4 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] scores = {100, 200, 300};\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ubc30\uc5f4\uc758 \ud06c\uae30\ub294 \uc0dd\uc131\ub41c \uc774\ud6c4 \ubcc0\uacbd\ud560 \uc218 \uc5c6\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub370\uc774\ud130 \uac1c\uc218\uac00 \ub3d9\uc801\uc73c\ub85c \ubcc0\ud55c\ub2e4\uba74 <code>ArrayList<\/code> \uac19\uc740 \uceec\ub809\uc158\uc744 \uc0ac\uc6a9\ud55c\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\uceec\ub809\uc158<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc5d0\ub294 \ub2e4\uc591\ud55c \uc790\ub8cc\uad6c\uc870\uac00 \ud45c\uc900 \ub77c\uc774\ube0c\ub7ec\ub9ac\ub85c \uc81c\uacf5\ub41c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub300\ud45c\uc801\uc778 \uceec\ub809\uc158\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ArrayList \/ LinkedList \/ HashMap \/ HashSet \/ TreeMap \/ TreeSet \/ Queue \/ Deque\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc608\ub97c \ub4e4\uc5b4:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Integer&gt; scores = new ArrayList&lt;&gt;();\n\nscores.add(100);\nscores.add(200);\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud0a4\uc640 \uac12\uc744 \uc800\uc7a5\ud558\ub824\uba74 <code>Map<\/code>\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Map&lt;Integer, Player&gt; players = new HashMap&lt;&gt;();\n\nplayers.put(1, player);\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc778\ud130\ud398\uc774\uc2a4 \ud0c0\uc785\uc778 <code>List<\/code>, <code>Map<\/code>\uc73c\ub85c \ubcc0\uc218\ub97c \uc120\uc5b8\ud558\uace0 \uc2e4\uc81c \uad6c\ud604\uccb4\ub97c <code>ArrayList<\/code>, <code>HashMap<\/code>\uc73c\ub85c \uc9c0\uc815\ud558\ub294 \ubc29\uc2dd\uc774 \uc77c\ubc18\uc801\uc774\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Player&gt; players = new ArrayList&lt;&gt;();\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ub807\uac8c \ud558\uba74 \uc0ac\uc6a9\ud558\ub294 \ucabd\uc5d0\uc11c \uad6c\uccb4\uc801\uc778 \uad6c\ud604\uc5d0 \ub300\ud55c \uc758\uc874\uc131\uc744 \uc904\uc77c \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Generic<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc758 \uc81c\ub124\ub9ad\uc740 \ud0c0\uc785\uc744 \ub9e4\uac1c\ubcc0\uc218\ucc98\ub7fc \uc0ac\uc6a9\ud560 \uc218 \uc788\ub3c4\ub85d \ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Container&lt;T&gt;\n{\n    private T value;\n\n    public Container(T value)\n    {\n        this.value = value;\n    }\n\n    public T getValue()\n    {\n        return value;\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc0ac\uc6a9\ud560 \ub54c \ud0c0\uc785\uc744 \uc9c0\uc815\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Container&lt;Integer&gt; a = new Container&lt;&gt;(100);\nContainer&lt;String&gt; b = new Container&lt;&gt;(\"Hello\");\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uceec\ub809\uc158\uc5d0\uc11c\ub3c4 \uc81c\ub124\ub9ad\uc744 \uc0ac\uc6a9\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Integer&gt; scores;\nList&lt;Player&gt; players;\nMap&lt;Integer, Player&gt; players;\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc81c\ub124\ub9ad\uc744 \uc0ac\uc6a9\ud558\uba74 \uc5ec\ub7ec \ud0c0\uc785\uc5d0 \ub300\uc751\ud558\ub294 \ucf54\ub4dc\ub97c \ub9cc\ub4e4\uba74\uc11c\ub3c4 \ucef4\ud30c\uc77c \ub2e8\uacc4\uc5d0\uc11c \ud0c0\uc785 \uc548\uc815\uc131\uc744 \ud655\ubcf4\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ubb38\uc790\uc5f4<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc758 <code>String<\/code>\uc740 \ub9e4\uc6b0 \uc790\uc8fc \uc0ac\uc6a9\ud558\ub294 \ucc38\uc870 \ud0c0\uc785\uc774\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String name = \"Player\";\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc911\uc694\ud55c \ud2b9\uc9d5 \uc911 \ud558\ub098\ub294 <code>String<\/code>\uc774 immutable, \uc989 \ubd88\ubcc0 \uac1d\uccb4\ub77c\ub294 \uac83\uc774\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String text = \"Hello\";\n\ntext = text + \" World\";\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uae30\uc874 \ubb38\uc790\uc5f4 \uac1d\uccb4\uc758 \ub0b4\uc6a9\uc744 \ubcc0\uacbd\ud558\ub294 \uac83\uc774 \uc544\ub2c8\ub77c \uc0c8\ub85c\uc6b4 \ubb38\uc790\uc5f4 \uac1d\uccb4\uac00 \ub9cc\ub4e4\uc5b4\uc9c8 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ubb38\uc790\uc5f4\uc744 \ubc18\ubcf5\uc801\uc73c\ub85c \uc218\uc815\ud574\uc57c \ud55c\ub2e4\uba74 <code>StringBuilder<\/code>\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>StringBuilder builder = new StringBuilder();\n\nbuilder.append(\"Hello\");\nbuilder.append(\" World\");\n\nString result = builder.toString();\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ubc18\ubcf5\uc801\uc778 \ubb38\uc790\uc5f4 \uacb0\ud569\uc774 \ub9ce\uc740 \ucf54\ub4dc\uc5d0\uc11c\ub294 \uc774\ub7f0 \ubc29\uc2dd\uc774 \ub354 \uc801\ud569\ud558\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\uc608\uc678 \ucc98\ub9ac<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\ub294 <code>try<\/code>, <code>catch<\/code>, <code>finally<\/code>\ub97c \uc774\uc6a9\ud574 \uc608\uc678\ub97c \ucc98\ub9ac\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>try\n{\n    int value = Integer.parseInt(\"abc\");\n}\ncatch (NumberFormatException e)\n{\n    System.out.println(\"Invalid number\");\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>finally<\/code>\ub294 \uc608\uc678 \ubc1c\uc0dd \uc5ec\ubd80\uc640 \uad00\uacc4\uc5c6\uc774 \uc2e4\ud589\ud574\uc57c \ud558\ub294 \ucf54\ub4dc\ub97c \ubc30\uce58\ud560 \ub54c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>try\n{\n    \/\/ \uc791\uc5c5\n}\ncatch (Exception e)\n{\n    \/\/ \uc624\ub958 \ucc98\ub9ac\n}\nfinally\n{\n    \/\/ \uc815\ub9ac\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc758 \uc608\uc678\uc5d0\ub294 checked exception\uacfc unchecked exception\uc774\ub77c\ub294 \uad6c\ubd84\uc774 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Checked exception\uc740 \ucef4\ud30c\uc77c\ub7ec\uac00 \ucc98\ub9ac\ub97c \uac15\uc81c\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>void readFile() throws IOException\n{\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ubc18\uba74 <code>RuntimeException<\/code> \uacc4\uc5f4\uc740 \ucef4\ud30c\uc77c\ub7ec\uac00 \uc608\uc678 \ucc98\ub9ac\ub97c \uac15\uc81c\ud558\uc9c0 \uc54a\ub294\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Exception -&gt; Checked Exception \/ RuntimeException -&gt; Unchecked Exception\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774 \uad6c\ubd84\uc740 Java\uc758 \uc608\uc678 \uc124\uacc4\uc5d0\uc11c \ub2e4\ub978 \uc5b8\uc5b4\uc640 \ube44\uad50\ud588\uc744 \ub54c \ud2b9\ud788 \ub208\uc5d0 \ub744\ub294 \ud2b9\uc9d5\uc774\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">try-with-resources<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ud30c\uc77c\uc774\ub098 \ub124\ud2b8\uc6cc\ud06c \uc5f0\uacb0\ucc98\ub7fc \uc0ac\uc6a9 \ud6c4 \uc815\ub9ac\uac00 \ud544\uc694\ud55c \ub9ac\uc18c\uc2a4\ub294 <code>try-with-resources<\/code>\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>try (FileInputStream input =\n         new FileInputStream(\"data.txt\"))\n{\n    \/\/ \ud30c\uc77c \uc0ac\uc6a9\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ube14\ub85d\uc744 \ubc97\uc5b4\ub098\uba74 \ud574\ub2f9 \ub9ac\uc18c\uc2a4\uac00 \uc790\ub3d9\uc73c\ub85c \ub2eb\ud78c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ub294 C#\uc758 <code>using<\/code>\uc774\ub098 C++\uc758 RAII\uc640 \ube44\uc2b7\ud55c \ubaa9\uc801\uc744 \uac00\uc9c4\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc758 \uba54\ubaa8\ub9ac\ub294 GC\uac00 \uad00\ub9ac\ud558\uc9c0\ub9cc \ud30c\uc77c\uc774\ub098 \uc18c\ucf13 \uac19\uc740 \uc678\ubd80 \ub9ac\uc18c\uc2a4\uae4c\uc9c0 GC\uac00 \uc989\uc2dc \uad00\ub9ac\ud574\uc8fc\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uadf8\ub798\uc11c \ub9ac\uc18c\uc2a4\uc758 \uc218\uba85 \uad00\ub9ac\uac00 \ubcc4\ub3c4\ub85c \ud544\uc694\ud558\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ub78c\ub2e4<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java 8\ubd80\ud130 \ub78c\ub2e4 \ud45c\ud604\uc2dd\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(a, b) -&gt; a + b\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud568\uc218\ud615 \uc778\ud130\ud398\uc774\uc2a4\uc640 \ud568\uaed8 \uc0ac\uc6a9\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Integer&gt; scores = List.of(10, 20, 30);\n\nscores.forEach(\n    score -&gt; System.out.println(score)\n);\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uceec\ub809\uc158 \ucc98\ub9ac\ub098 \ucf5c\ubc31 \ub4f1\uc744 \uac04\uacb0\ud558\uac8c \ud45c\ud604\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Stream API<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc758 Stream API\ub294 \uceec\ub809\uc158 \ub370\uc774\ud130\ub97c \uc120\uc5b8\uc801\uc778 \ubc29\uc2dd\uc73c\ub85c \ucc98\ub9ac\ud560 \uc218 \uc788\ub3c4\ub85d \ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Integer&gt; result =\n    scores.stream()\n          .filter(score -&gt; score &gt;= 100)\n          .sorted()\n          .toList();\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc5ec\uae30\uc11c\ub294 \ub2e4\uc74c \uc791\uc5c5\uc744 \uc5f0\uacb0\ud588\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Collection -&gt; filter -&gt; sort -&gt; List\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ub300\ud45c\uc801\uc778 \uc5f0\uc0b0\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>filter \/ map \/ sorted \/ distinct \/ limit \/ anyMatch \/ allMatch \/ findFirst \/ collect \/ toList\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Stream\uc740 \uceec\ub809\uc158 \uc790\uccb4\ub97c \ubcc0\uacbd\ud558\ub294 \uac83\uc774 \uc544\ub2c8\ub77c \ub370\uc774\ud130\ub97c \ucc98\ub9ac\ud558\ub294 \ud30c\uc774\ud504\ub77c\uc778\uc744 \uad6c\uc131\ud558\ub294 \ub370 \uc801\ud569\ud558\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\ub9cc \ubaa8\ub4e0 \ucf54\ub4dc\uc5d0 Stream\uc744 \uc0ac\uc6a9\ud558\ub294 \uac83\uc774 \uc88b\uc740 \uac83\uc740 \uc544\ub2c8\ub2e4. \ubcf5\uc7a1\ud55c \ub85c\uc9c1\uc5d0\uc11c\ub294 \uc77c\ubc18\uc801\uc778 \ubc18\ubcf5\ubb38\uc774 \ub354 \uc77d\uae30 \uc26c\uc6b8 \uc218 \uc788\uace0, \uc131\ub2a5\uc774 \uc911\uc694\ud55c \ubd80\ubd84\uc5d0\uc11c\ub294 \uc2e4\uc81c \ube44\uc6a9\uc744 \ud655\uc778\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Optional<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc5d0\uc11c\ub294 <code>null<\/code>\ub85c \uc778\ud55c \ubb38\uc81c\ub97c \uc904\uc774\uae30 \uc704\ud55c \ubc29\ubc95\uc73c\ub85c <code>Optional<\/code>\uc744 \uc81c\uacf5\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Optional&lt;Player&gt; player = findPlayer(10);\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uac12\uc774 \uc874\uc7ac\ud558\ub294\uc9c0 \ud655\uc778\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>player.ifPresent(\n    p -&gt; p.attack()\n);\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uae30\ubcf8\uac12\ub3c4 \uc9c0\uc815\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Player result =\n    player.orElse(defaultPlayer);\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>Optional<\/code>\uc774 \ubaa8\ub4e0 <code>null<\/code>\uc744 \uc5c6\uc560\uc8fc\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b9\ud788 \ud544\ub4dc\ub098 \uba54\uc11c\ub4dc \uc778\uc790\uc5d0 \ubb34\ubd84\ubcc4\ud558\uac8c \uc0ac\uc6a9\ud558\ub294 \uac83\ubcf4\ub2e4\ub294 \ubc18\ud658\uac12\ucc98\ub7fc &#8220;\uac12\uc774 \uc5c6\uc744 \uc218\ub3c4 \uc788\ub2e4&#8221;\ub294 \uc758\ubbf8\ub97c \uba85\ud655\ud558\uac8c \uc804\ub2ec\ud560 \ub54c \uc0ac\uc6a9\ud558\ub294 \ud3b8\uc774 \uc77c\ubc18\uc801\uc774\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\uc2a4\ub808\ub4dc<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\ub294 \uba40\ud2f0\uc2a4\ub808\ub4dc \ud504\ub85c\uadf8\ub798\ubc0d\uc744 \uc704\ud55c \uae30\ub2a5\uc744 \uc81c\uacf5\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uae30\ubcf8\uc801\uc778 \uc2a4\ub808\ub4dc\ub294 \ub2e4\uc74c\ucc98\ub7fc \ub9cc\ub4e4 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Thread thread = new Thread(() -&gt;\n{\n    System.out.println(\"Worker\");\n});\n\nthread.start();\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud558\uc9c0\ub9cc \uc2e4\ubb34\uc5d0\uc11c\ub294 \uc9c1\uc811 <code>Thread<\/code> \uac1d\uccb4\ub97c \uacc4\uc18d \uc0dd\uc131\ud558\uae30\ubcf4\ub2e4\ub294 <code>ExecutorService<\/code>\ub098 <code>CompletableFuture<\/code> \uac19\uc740 \ucd94\uc0c1\ud654\ub97c \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0\uac00 \ub9ce\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ExecutorService executor =\n    Executors.newFixedThreadPool(4);\n\nexecutor.submit(() -&gt;\n{\n    \/\/ \uc791\uc5c5\n});\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc2a4\ub808\ub4dc \ud480\uc744 \uc0ac\uc6a9\ud558\uba74 \uc791\uc5c5\ub9c8\ub2e4 \uc2a4\ub808\ub4dc\ub97c \uc0c8\ub85c \uc0dd\uc131\ud558\ub294 \ube44\uc6a9\uc744 \uc904\uc774\uace0 \uc2a4\ub808\ub4dc \uc218\ub97c \uad00\ub9ac\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ub3d9\uae30\ud654<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\uc5ec\ub7ec \uc2a4\ub808\ub4dc\uac00 \ub3d9\uc77c\ud55c \ub370\uc774\ud130\ub97c \uc218\uc815\ud558\uba74 race condition\uc774 \ubc1c\uc0dd\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>synchronized void addScore(int value)\n{\n    score += value;\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>synchronized<\/code>\ub97c \uc0ac\uc6a9\ud558\uba74 \ud574\ub2f9 \uba54\uc11c\ub4dc\uc5d0 \ub300\ud55c \ub3d9\uc2dc \uc811\uadfc\uc744 \uc81c\uc5b4\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uadf8 \uc678\uc5d0\ub3c4 Java\uc5d0\uc11c\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \ub3d9\uc2dc\uc131 \ub3c4\uad6c\ub97c \uc81c\uacf5\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>synchronized \/ volatile \/ AtomicInteger \/ ConcurrentHashMap \/ Lock \/ Semaphore \/ CountDownLatch \/ CompletableFuture\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uba40\ud2f0\uc2a4\ub808\ub4dc \ucf54\ub4dc\uc5d0\uc11c\ub294 \ub2e8\uc21c\ud788 \uc2a4\ub808\ub4dc\ub97c \ub9ce\uc774 \ub9cc\ub4dc\ub294 \uac83\ubcf4\ub2e4 \uacf5\uc720 \uc0c1\ud0dc\ub97c \uc5bc\ub9c8\ub098 \uc904\uc774\uace0, \ud544\uc694\ud55c \ub3d9\uae30\ud654\ub97c \uc5b4\ub514\uc5d0 \ub458 \uac83\uc778\uc9c0\uac00 \uc911\uc694\ud558\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">JVM \uba54\ubaa8\ub9ac \uad6c\uc870<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\ub97c \uc774\ud574\ud558\ub824\uba74 JVM\uc758 \uba54\ubaa8\ub9ac \uad6c\uc870\ub3c4 \uc5b4\ub290 \uc815\ub3c4 \uc54c\uace0 \uc788\uc5b4\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub300\ud45c\uc801\uc73c\ub85c \ub2e4\uc74c \uc601\uc5ed\uc744 \uc0dd\uac01\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>JVM -&gt; Heap \/ Java Stack \/ Method Area \/ PC Register \/ Native Method Stack\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Heap\uc5d0\ub294 \uc77c\ubc18\uc801\uc73c\ub85c \uac1d\uccb4\uc640 \ubc30\uc5f4\uc774 \uc800\uc7a5\ub41c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Player player = new Player();\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc5ec\uae30\uc11c <code>new Player()<\/code>\ub85c \uc0dd\uc131\ub41c \uac1d\uccb4\ub294 \uc77c\ubc18\uc801\uc73c\ub85c Heap\uc5d0 \uc874\uc7ac\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java Stack\uc5d0\ub294 \uac01 \uc2a4\ub808\ub4dc\uc758 \uba54\uc11c\ub4dc \ud638\ucd9c \ud504\ub808\uc784\uacfc \uc9c0\uc5ed \ubcc0\uc218 \ub4f1\uc774 \uad00\ub9ac\ub41c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Thread -&gt; main() -&gt; local variables\nThread -&gt; update() -&gt; local variables\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\ub9cc JVM\uc740 JIT \ucd5c\uc801\ud654\ub97c \uc218\ud589\ud558\uae30 \ub54c\ubb38\uc5d0 \uc18c\uc2a4 \ucf54\ub4dc \uc218\uc900\uc758 \uac1c\ub150\uc744 \uc2e4\uc81c \ubb3c\ub9ac\uc801 \uba54\ubaa8\ub9ac \ubc30\uce58\uc640 1:1\ub85c \ub300\uc751\uc2dc\ud0a4\uba74 \uc548 \ub41c\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Garbage Collection<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc758 \uba54\ubaa8\ub9ac \uad00\ub9ac\ub294 Garbage Collector\uac00 \ub2f4\ub2f9\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Player player = new Player();\n\nplayer = null;\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ud6c4 \ud574\ub2f9 \uac1d\uccb4\ub97c \uac00\ub9ac\ud0a4\ub294 \ub2e4\ub978 \ucc38\uc870\uac00 \uc5c6\ub2e4\uba74 GC\uac00 \ud68c\uc218\ud560 \uc218 \uc788\ub294 \uc0c1\ud0dc\uac00 \ub41c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc804\uccb4\uc801\uc778 \ud750\ub984\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Object Allocation -&gt; Object Usage -&gt; No Reachable Reference -&gt; GC Candidate -&gt; Garbage Collection -&gt; Memory Reclaimed\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uac1c\ubc1c\uc790\uac00 <code>delete<\/code>\ub97c \ud638\ucd9c\ud560 \ud544\uc694\ub294 \uc5c6\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud558\uc9c0\ub9cc GC\uac00 \uc788\ub2e4\ub294 \uc774\uc720\ub85c \uba54\ubaa8\ub9ac \uad00\ub9ac\uac00 \ud544\uc694 \uc5c6\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uac1d\uccb4\ub97c \uacc4\uc18d \uc0dd\uc131\ud558\uba74 Heap \uc0ac\uc6a9\ub7c9\uc774 \uc99d\uac00\ud558\uace0 GC\uac00 \ub354 \uc790\uc8fc \ubc1c\uc0dd\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b9\ud788 \uc11c\ubc84\uc5d0\uc11c \ub300\ub7c9\uc758 \uac1d\uccb4\uac00 \uc0dd\uc131\ub418\ub294 \uc0c1\ud669\uc774\ub098 \uc9c0\uc5f0 \uc2dc\uac04\uc774 \uc911\uc694\ud55c \uc2dc\uc2a4\ud15c\uc5d0\uc11c\ub294 GC\uc758 \ub3d9\uc791\uacfc allocation pattern\uc744 \uc2e0\uacbd \uc368\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">JIT \ucef4\ud30c\uc77c<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\ub294 \ub2e8\uc21c\ud788 \ubc14\uc774\ud2b8\ucf54\ub4dc\ub97c \ud55c \uc904\uc529 \ud574\uc11d\ud574\uc11c \uc2e4\ud589\ud558\ub294 \uad6c\uc870\ub9cc \uc0ac\uc6a9\ud558\ub294 \uac83\uc774 \uc544\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">JVM\uc740 \ud504\ub85c\uadf8\ub7a8 \uc2e4\ud589 \uc911 \uc790\uc8fc \uc2e4\ud589\ub418\ub294 \ucf54\ub4dc\ub97c \ubd84\uc11d\ud558\uace0 \ub124\uc774\ud2f0\ube0c \ucf54\ub4dc\ub85c \ucef4\ud30c\uc77c\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Bytecode -&gt; JVM \uc2e4\ud589 -&gt; Hot Code Detection -&gt; JIT Compilation -&gt; Native Code\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud504\ub85c\uadf8\ub7a8\uc774 \uc2e4\ud589\ub418\uba74\uc11c JVM\uc774 \ub7f0\ud0c0\uc784 \uc815\ubcf4\ub97c \ud65c\uc6a9\ud574 \ucd5c\uc801\ud654\ub97c \uc218\ud589\ud560 \uc218 \uc788\ub2e4\ub294 \uac83\uc774 JIT\uc758 \ud2b9\uc9d5\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uadf8\ub798\uc11c Java \uc131\ub2a5\uc744 \uc774\uc57c\uae30\ud560 \ub54c \ub2e8\uc21c\ud788 &#8220;Java\ub294 VM\uc5d0\uc11c \uc2e4\ud589\ub418\uae30 \ub54c\ubb38\uc5d0 \ub290\ub9ac\ub2e4&#8221;\ub77c\uace0 \ubcf4\ub294 \uac83\uc740 \ud604\uc7ac\uc758 JVM\uc744 \uc124\uba85\ud558\uae30\uc5d0\ub294 \ubd80\uc871\ud558\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Reflection<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc5d0\uc11c\ub294 \ub7f0\ud0c0\uc784\uc5d0 \ud074\ub798\uc2a4\uc640 \uba54\uc11c\ub4dc \ub4f1\uc758 \uc815\ubcf4\ub97c \uc870\ud68c\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Class&lt;?&gt; type = Player.class;\n\nMethod&#91;] methods = type.getDeclaredMethods();\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ub7f0 \uae30\ub2a5\uc744 Reflection\uc774\ub77c\uace0 \ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud504\ub808\uc784\uc6cc\ud06c\uc5d0\uc11c\ub294 \uc0c1\ub2f9\ud788 \uc720\uc6a9\ud558\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc608\ub97c \ub4e4\uc5b4 \uc5b4\ub5a4 \ud074\ub798\uc2a4\uc5d0 \uc5b4\ub5a4 \ud544\ub4dc\uc640 \uba54\uc11c\ub4dc\uac00 \uc788\ub294\uc9c0 \ub7f0\ud0c0\uc784\uc5d0 \ubd84\uc11d\ud574\uc11c \uc790\ub3d9\uc73c\ub85c \uac1d\uccb4\ub97c \uc0dd\uc131\ud558\uac70\ub098 \ub370\uc774\ud130\ub97c \ub9e4\ud551\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Spring \uac19\uc740 Java \ud504\ub808\uc784\uc6cc\ud06c\uac00 \ub2e4\uc591\ud55c \uae30\ub2a5\uc744 \uc81c\uacf5\ud560 \uc218 \uc788\ub294 \uae30\ubc18 \uc911 \ud558\ub098\uc774\uae30\ub3c4 \ud558\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\ub9cc Reflection\uc740 \uc77c\ubc18\uc801\uc778 \uc9c1\uc811 \ud638\ucd9c\ubcf4\ub2e4 \ubcf5\uc7a1\ud558\uace0 \ub7f0\ud0c0\uc784 \uc624\ub958 \uac00\ub2a5\uc131\ub3c4 \uc788\uae30 \ub54c\ubb38\uc5d0 \uc131\ub2a5\uc774\ub098 \uc548\uc815\uc131\uc774 \uc911\uc694\ud55c \ucf54\ub4dc\uc5d0\uc11c \ubb34\ubd84\ubcc4\ud558\uac8c \uc0ac\uc6a9\ud558\ub294 \uac83\uc740 \uc801\uc808\ud558\uc9c0 \uc54a\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Annotation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc5d0\uc11c\ub294 <code>@<\/code>\ub97c \uc0ac\uc6a9\ud574 \uba54\ud0c0\ub370\uc774\ud130\ub97c \ud45c\ud604\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@Override\npublic void attack()\n{\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>@Override<\/code>\ub294 \ud574\ub2f9 \uba54\uc11c\ub4dc\uac00 \ubd80\ubaa8 \ud074\ub798\uc2a4\ub098 \uc778\ud130\ud398\uc774\uc2a4\uc758 \uba54\uc11c\ub4dc\ub97c \uc7ac\uc815\uc758\ud55c\ub2e4\ub294 \uac83\uc744 \ucef4\ud30c\uc77c\ub7ec\uc5d0\uac8c \uc54c\ub824\uc900\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc0ac\uc6a9\uc790 \uc815\uc758 Annotation\ub3c4 \ub9cc\ub4e4 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@interface MyAnnotation\n{\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud504\ub808\uc784\uc6cc\ud06c\uc5d0\uc11c\ub294 Annotation\uc744 \uae30\ubc18\uc73c\ub85c \ud2b9\uc815 \ub3d9\uc791\uc744 \uc790\ub3d9\uc73c\ub85c \ucc98\ub9ac\ud558\ub294 \uacbd\uc6b0\uac00 \ub9ce\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Spring\uc758 <code>@Controller<\/code>, <code>@Service<\/code>, <code>@Autowired<\/code> \uac19\uc740 \uae30\ub2a5\ub3c4 \uc774\ub7f0 \ubc29\uc2dd\uacfc \uc5f0\uacb0\ub418\uc5b4 \uc788\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Java\uc640 JVM<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\ub97c \uacf5\ubd80\ud558\uba74\uc11c Java \uc5b8\uc5b4\uc640 JVM\uc744 \ubd84\ub9ac\ud574\uc11c \uc0dd\uac01\ud560 \ud544\uc694\uac00 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Java -&gt; Language \/ Standard Library \/ Compiler \/ JVM\nJVM -&gt; Class Loader \/ Runtime Memory \/ JIT Compiler \/ Garbage Collector\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Java \uc18c\uc2a4 \ucf54\ub4dc\uac00 \uc2e4\ud589\ub418\ub294 \uc804\uccb4 \ud658\uacbd\uc5d0\ub294 \uc5b8\uc5b4 \ubb38\ubc95 \uc678\uc5d0\ub3c4 \ucef4\ud30c\uc77c\ub7ec\uc640 JVM, \ud45c\uc900 \ub77c\uc774\ube0c\ub7ec\ub9ac\uac00 \ud568\uaed8 \uad00\uc5ec\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uadf8\ub798\uc11c Java \uc131\ub2a5\uc774\ub098 \uba54\ubaa8\ub9ac \ubb38\uc81c\ub97c \uc81c\ub300\ub85c \ubd84\uc11d\ud558\ub824\uba74 Java \ubb38\ubc95\ub9cc \uc54c\uc544\uc11c\ub294 \ubd80\uc871\ud558\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Heap \uc0ac\uc6a9\ub7c9, GC, Thread, JIT, Class Loading \uac19\uc740 JVM \ub0b4\ubd80 \ub3d9\uc791\ub3c4 \uc5b4\ub290 \uc815\ub3c4 \uc774\ud574\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Java\uc5d0\uc11c \uac1d\uccb4\uc758 \uc0dd\uba85\uc8fc\uae30<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java \ud504\ub85c\uadf8\ub7a8\uc744 \uc774\ud574\ud560 \ub54c \uac1d\uccb4\uc758 \uc0dd\uba85\uc8fc\uae30\ub97c \ubcf4\uba74 \uc5ec\ub7ec \uac1c\ub150\uc774 \uc5f0\uacb0\ub41c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>new -&gt; Object Creation -&gt; Reference -&gt; Object Usage -&gt; Reference Lost -&gt; GC -&gt; Memory Reclaimed\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc608\ub97c \ub4e4\uc5b4:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Player player = new Player();\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>new<\/code>\ub97c \ud1b5\ud574 \uac1d\uccb4\uac00 \ub9cc\ub4e4\uc5b4\uc9c0\uace0 <code>player<\/code>\uac00 \uadf8 \uac1d\uccb4\ub97c \ucc38\uc870\ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>player = null;\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\ub978 \uacf3\uc5d0\uc11c \ud574\ub2f9 \uac1d\uccb4\ub97c \ucc38\uc870\ud558\uc9c0 \uc54a\ub294\ub2e4\uba74 GC\uac00 \ud68c\uc218\ud560 \uc218 \uc788\ub294 \uc0c1\ud0dc\uac00 \ub41c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java \uac1c\ubc1c\uc5d0\uc11c \uba54\ubaa8\ub9ac \ud574\uc81c\ub97c \uc9c1\uc811 \ud558\uc9c0 \uc54a\ub294 \ub300\uc2e0 <strong>\uac1d\uccb4\uac00 \uc5b8\uc81c\uae4c\uc9c0 \ucc38\uc870\ub418\ub294\uac00<\/strong>\uac00 \uc911\uc694\ud55c \ubb38\uc81c\uac00 \ub41c\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Java\uc5d0\uc11c \uc790\uc8fc \uc0ac\uc6a9\ud558\ub294 \uad6c\uc870<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java \ubc31\uc5d4\ub4dc \ucf54\ub4dc\ub97c \ubcf4\uba74 \ub300\ub7b5 \ub2e4\uc74c\uacfc \uac19\uc740 \uacc4\uce35\uc744 \uc790\uc8fc \ubcfc \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Controller -&gt; Service -&gt; Repository -&gt; Database\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uac01 \uacc4\uce35\uc758 \uc5ed\ud560\uc744 \ubd84\ub9ac\ud558\uace0 \uac1d\uccb4 \uac04 \uc758\uc874\uc131\uc744 \uad00\ub9ac\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java \uc790\uccb4\uac00 \uc774\ub7f0 \uad6c\uc870\ub97c \uac15\uc81c\ud558\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Spring \uac19\uc740 \ud504\ub808\uc784\uc6cc\ud06c\uc640 \ud568\uaed8 \uc0ac\uc6a9\ud558\uba74\uc11c \uc774\ub7ec\ud55c \uad6c\uc870\uac00 \ub9ce\uc774 \uc815\ucc29\ub41c \uac83\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub530\ub77c\uc11c Java \uc5b8\uc5b4\uc640 Java \uc0dd\ud0dc\uacc4\uc758 \ud504\ub808\uc784\uc6cc\ud06c \uad6c\uc870\ub294 \uad6c\ubd84\ud574\uc11c \ubcf4\ub294 \uac83\uc774 \uc88b\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Java\uc758 \uc7a5\uc810\uacfc \ud55c\uacc4<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\uc758 \uc7a5\uc810\uc740 \uc548\uc815\uc801\uc778 \ub7f0\ud0c0\uc784\uacfc \ud48d\ubd80\ud55c \uc0dd\ud0dc\uacc4, \ud50c\ub7ab\ud3fc \ub3c5\ub9bd\uc131, \uac15\ub825\ud55c \ud45c\uc900 \ub77c\uc774\ube0c\ub7ec\ub9ac, \ub2e4\uc591\ud55c \uac1c\ubc1c \ub3c4\uad6c\uc5d0 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b9\ud788 \ub300\uaddc\ubaa8 \uc11c\ubc84 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uac1c\ubc1c\ud560 \ub54c \uc624\ub79c \uae30\uac04 \ucd95\uc801\ub41c \ub77c\uc774\ube0c\ub7ec\ub9ac\uc640 \ud504\ub808\uc784\uc6cc\ud06c\ub97c \ud65c\uc6a9\ud560 \uc218 \uc788\ub2e4\ub294 \uac83\uc774 \ud070 \uc7a5\uc810\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ubc18\uba74 JVM\uc774\ub77c\ub294 \uc2e4\ud589 \ud658\uacbd\uacfc GC\uac00 \uc874\uc7ac\ud558\uae30 \ub54c\ubb38\uc5d0 C++\ucc98\ub7fc \uba54\ubaa8\ub9ac\uc640 \uc2e4\ud589 \ud658\uacbd\uc744 \uadf9\ub2e8\uc801\uc73c\ub85c \uc9c1\uc811 \uc81c\uc5b4\ud558\ub294 \ubc29\uc2dd\uacfc\ub294 \ucc28\uc774\uac00 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">GC pause\ub098 allocation\uc744 \uace0\ub824\ud574\uc57c \ud558\ub294 \uc2dc\uc2a4\ud15c\uc5d0\uc11c\ub294 JVM \ub3d9\uc791\uc744 \uc774\ud574\ud560 \ud544\uc694\uac00 \uc788\uace0, \ub9e4\uc6b0 \ub0ae\uc740 \uc218\uc900\uc758 \uc2dc\uc2a4\ud15c \uc81c\uc5b4\uac00 \ud544\uc694\ud55c \uc601\uc5ed\uc5d0\uc11c\ub294 C++ \uac19\uc740 \uc5b8\uc5b4\uac00 \ub354 \uc801\ud569\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\uc815\ub9ac<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java\ub97c \ud070 \ud750\ub984\uc73c\ub85c \uc815\ub9ac\ud558\uba74 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Java Syntax -&gt; Type System -&gt; Class \/ Object -&gt; Inheritance \/ Interface -&gt; Generic \/ Collection -&gt; Lambda \/ Stream -&gt; Exception \/ Resource Management -&gt; Thread \/ Concurrency -&gt; JVM -&gt; Heap \/ Stack -&gt; Garbage Collection -&gt; JIT Compilation\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Java\ub97c \ucc98\uc74c \uacf5\ubd80\ud558\uba74 \uac1d\uccb4\uc9c0\ud5a5 \ubb38\ubc95\uacfc \uceec\ub809\uc158, \uc608\uc678 \ucc98\ub9ac \uc815\ub3c4\uc5d0\uc11c \ub05d\ub098\ub294 \uac83\ucc98\ub7fc \ubcf4\uc778\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud558\uc9c0\ub9cc \uc2e4\uc81c\ub85c Java\ub77c\ub294 \uc5b8\uc5b4\uc758 \ud2b9\uc131\uc744 \uc774\ud574\ud558\ub824\uba74 JVM\uae4c\uc9c0 \ub0b4\ub824\uac00\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C++\uc774 \uac1c\ubc1c\uc790\uc5d0\uac8c \uba54\ubaa8\ub9ac\uc640 \uac1d\uccb4\uc758 \uc218\uba85\uc744 \uc9c1\uc811 \uad00\ub9ac\ud560 \uc218 \uc788\ub294 \uad8c\ud55c\uc744 \ub9ce\uc774 \uc8fc\ub294 \uc5b8\uc5b4\ub77c\uba74, Java\ub294 JVM\uc744 \ud1b5\ud574 \uba54\ubaa8\ub9ac \uad00\ub9ac\uc640 \uc2e4\ud589 \ud658\uacbd\uc758 \uc0c1\ub2f9 \ubd80\ubd84\uc744 \ucd94\uc0c1\ud654\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uadf8 \ub300\uc2e0 \uac1c\ubc1c\uc790\ub294 \uac1d\uccb4\uc758 \ucc38\uc870 \uad00\uacc4\uc640 GC, \uc2a4\ub808\ub4dc, JIT \uac19\uc740 \ub7f0\ud0c0\uc784\uc758 \ub3d9\uc791\uc744 \uc774\ud574\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uacb0\uad6d Java\uc5d0\uc11c \uc911\uc694\ud55c \uac83\uc740 \ubb38\ubc95\uc744 \ub9ce\uc774 \uc678\uc6b0\ub294 \uac83\uc774 \uc544\ub2c8\ub77c <strong>\uac1d\uccb4\uac00 \uc5b4\ub5bb\uac8c \ub9cc\ub4e4\uc5b4\uc9c0\uace0 \ucc38\uc870\ub418\uba70 \uc2e4\ud589\ub418\uace0, JVM\uc774 \uadf8\uac83\uc744 \uc5b4\ub5bb\uac8c \uad00\ub9ac\ud558\ub294\uc9c0<\/strong>\ub97c \uc5f0\uacb0\ud574\uc11c \uc774\ud574\ud558\ub294 \uac83\uc774\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\ub294 \uac1d\uccb4\uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d\uc744 \uc911\uc2ec\uc73c\ub85c \uc124\uacc4\ub41c \ubc94\uc6a9 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\ub2e4. 1995\ub144 \ucc98\uc74c \uacf5\uac1c\ub41c \uc774\ud6c4 \uc6f9 \uc11c\ubc84, \uae30\uc5c5\uc6a9 \uc560\ud50c\ub9ac\ucf00\uc774\uc158, Android, \uae08\uc735 \uc2dc\uc2a4\ud15c, \ub300\uaddc\ubaa8 \ubc31\uc5d4\ub4dc \ub4f1 \ub2e4\uc591\ud55c \ubd84\uc57c\uc5d0\uc11c \uc0ac\uc6a9\ub418\uc5b4 \uc654\ub2e4. Java\uc758 \uac00\uc7a5 \ud070 \ud2b9\uc9d5\uc740 JVM(Java Virtual Machine)\uc744 \uc911\uc2ec\uc73c\ub85c \ud55c \uc2e4\ud589 \ud658\uacbd\uc774\ub2e4. Java \uc18c\uc2a4 \ucf54\ub4dc\ub294 \ubc14\uc774\ud2b8\ucf54\ub4dc\ub85c \ucef4\ud30c\uc77c\ub418\uace0 JVM\uc774 \uc774\ub97c \uc2e4\ud589\ud55c\ub2e4. \uc774 \uad6c\uc870 \ub355\ubd84\uc5d0 \uc6b4\uc601\uccb4\uc81c\uc5d0 \uc885\uc18d\ub41c \ub124\uc774\ud2f0\ube0c \uc2e4\ud589 \ud30c\uc77c\uc744 \uc9c1\uc811 \ub9cc\ub4dc\ub294 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[50],"tags":[],"class_list":["post-1695","post","type-post","status-publish","format-standard","hentry","category-language"],"_links":{"self":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts\/1695","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1695"}],"version-history":[{"count":2,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts\/1695\/revisions"}],"predecessor-version":[{"id":1978,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts\/1695\/revisions\/1978"}],"wp:attachment":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1695"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1695"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1695"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}