{"id":125,"date":"2023-08-25T22:34:31","date_gmt":"2023-08-25T13:34:31","guid":{"rendered":"https:\/\/blog.mumooinfo.com\/?p=125"},"modified":"2023-10-10T22:36:58","modified_gmt":"2023-10-10T13:36:58","slug":"java%ec%9d%98-arraylist","status":"publish","type":"post","link":"https:\/\/mumooinfo.com\/programming\/java%ec%9d%98-arraylist\/","title":{"rendered":"JAVA\uc758 ArrayList"},"content":{"rendered":"\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"533\" height=\"533\" class=\"wp-image-126 aligncenter\" src=\"https:\/\/mumooinfo.com\/wp-content\/uploads\/2023\/08\/\uc81c\ubaa9\uc744-\uc785\ub825\ud574\uc8fc\uc138\uc694_-001-15.jpg\" alt=\"\" srcset=\"https:\/\/mumooinfo.com\/wp-content\/uploads\/2023\/08\/\uc81c\ubaa9\uc744-\uc785\ub825\ud574\uc8fc\uc138\uc694_-001-15.jpg 533w, https:\/\/mumooinfo.com\/wp-content\/uploads\/2023\/08\/\uc81c\ubaa9\uc744-\uc785\ub825\ud574\uc8fc\uc138\uc694_-001-15-300x300.jpg 300w, https:\/\/mumooinfo.com\/wp-content\/uploads\/2023\/08\/\uc81c\ubaa9\uc744-\uc785\ub825\ud574\uc8fc\uc138\uc694_-001-15-150x150.jpg 150w\" sizes=\"(max-width: 533px) 100vw, 533px\" \/><\/figure><\/div>\r\n\r\n\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">ArrayList<\/h2>\r\n\r\n\r\n\r\n<p>Java\uc5d0\uc11c ArrayList\ub294 \uae30\uc874 \ubc30\uc5f4\uc5d0 \ube44\ud574 \ubc30\uc5f4\uc744 \uc0ac\uc6a9\ud558\ub294 \ub354 \uc720\uc5f0\ud558\uace0 \uac15\ub825\ud55c \ubc29\ubc95\uc744 \uc81c\uacf5\ud558\ub294 \ub3d9\uc801 \ubc30\uc5f4 \uad6c\ud604\uc785\ub2c8\ub2e4. ArrayList\ub294 Java Collections Framework\uc758 \uc77c\ubd80\uc774\uba70 java.util \ud328\ud0a4\uc9c0\uc758 \uc77c\ubd80\uc785\ub2c8\ub2e4. \uc694\uc18c \uceec\ub809\uc158\uc744 \uc800\uc7a5\ud558\uace0 \uc870\uc791\ud558\uae30 \uc704\ud574 \uc77c\ubc18\uc801\uc73c\ub85c \uc0ac\uc6a9\ub418\ub294 \ub370\uc774\ud130 \uad6c\uc870\uc785\ub2c8\ub2e4.<\/p>\r\n\r\n\r\n\r\n<p>\ub2e4\uc74c\uc740 &#8216;ArrayList&#8217;\uc758 \uba87 \uac00\uc9c0 \uc8fc\uc694 \ud2b9\uc9d5\uacfc \ud2b9\uc9d5\uc785\ub2c8\ub2e4.<\/p>\r\n\r\n\r\n\r\n<p>&nbsp;<\/p>\r\n<center><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-4435445268668222\" crossorigin=\"anonymous\"><\/script> <!-- [\ub514\uc2a4\ud50c\ub808\uc774 \uad11\uace0] \ubc18\uc751\ud615 \uc6cc\ub4dc\ud504\ub808\uc2a4 \ubcf8\ubb38 --> <ins class=\"adsbygoogle\" style=\"display: block;\" data-ad-client=\"ca-pub-4435445268668222\" data-ad-slot=\"9091536397\" data-ad-format=\"auto\" data-full-width-responsive=\"true\"><\/ins> <script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/center>\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\ub3d9\uc801 \ud06c\uae30 \uc870\uc815(Dynamic Sizing)<\/h3>\r\n\r\n\r\n\r\n<p>\uae30\uc874 \ubc30\uc5f4\uacfc \ub2ec\ub9ac ArrayList\ub294 \uc694\uc18c\uac00 \ucd94\uac00\ub418\uac70\ub098 \uc81c\uac70\ub420 \ub54c \ub3d9\uc801\uc73c\ub85c \ud06c\uae30\ub97c \uc870\uc815\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc989, \ud06c\uae30\ub97c \ubbf8\ub9ac \uc9c0\uc815\ud560 \ud544\uc694\uac00 \uc5c6\uc73c\ubbc0\ub85c \ub2e4\uc591\ud55c \ud06c\uae30\uc758 \uceec\ub809\uc158\uc73c\ub85c \uc791\uc5c5\ud558\ub294 \uac83\uc774 \ud3b8\ub9ac\ud569\ub2c8\ub2e4.<\/p>\r\n\r\n\r\n\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\uc77c\ubc18(Generic)<\/h3>\r\n\r\n\r\n\r\n<p>ArrayList\ub294 \uc77c\ubc18 \ud074\ub798\uc2a4\uc785\ub2c8\ub2e4. \uc989, \uaebe\uc1e0 \uad04\ud638(&lt;&gt;)\ub97c \uc0ac\uc6a9\ud558\uc5ec \ubcf4\uc720\ud560 \uc694\uc18c \uc720\ud615\uc744 \uc9c0\uc815\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4 ArrayList\ub294 \uc815\uc218\ub9cc \uc800\uc7a5\ud560 \uc218 \uc788\ub294 ArrayList\ub97c \uc0dd\uc131\ud569\ub2c8\ub2e4.<\/p>\r\n\r\n\r\n\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\uba54\uc11c\ub4dc \uc0ac\uc6a9\ubc29\ubc95<\/h3>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>add(element): \ubaa9\ub85d \ub05d\uc5d0 \uc694\uc18c\ub97c \ucd94\uac00\ud569\ub2c8\ub2e4.<\/li>\r\n\r\n\r\n\r\n<li>add(index, element): \uc9c0\uc815\ub41c \uc778\ub371\uc2a4\uc5d0 \uc694\uc18c\ub97c \uc0bd\uc785\ud569\ub2c8\ub2e4.<\/li>\r\n\r\n\r\n\r\n<li>remove(index): \uc9c0\uc815\ub41c \uc778\ub371\uc2a4\uc5d0 \uc788\ub294 \uc694\uc18c\ub97c \uc81c\uac70\ud569\ub2c8\ub2e4.<\/li>\r\n\r\n\r\n\r\n<li>get(index): \uc9c0\uc815\ub41c \uc778\ub371\uc2a4\uc5d0 \uc788\ub294 \uc694\uc18c\ub97c \uac80\uc0c9\ud569\ub2c8\ub2e4.<\/li>\r\n\r\n\r\n\r\n<li>size(): ArrayList\uc758 \uc694\uc18c \uc218\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\uc790\ub3d9 \ud06c\uae30 \uc870\uc815<\/h3>\r\n\r\n\r\n\r\n<p>ArrayList\uac00 \uac00\ub4dd \ucc28\uc11c \ub2e4\ub978 \uc694\uc18c\ub97c \ucd94\uac00\ud558\ub824\uace0 \ud558\uba74 \uc790\ub3d9\uc73c\ub85c \ub354 \ud070 \uc0c8 \ubc30\uc5f4\uc774 \uc0dd\uc131\ub418\uace0 \uae30\uc874 \uc694\uc18c\uac00 \ubcf5\uc0ac\ub429\ub2c8\ub2e4. \uc774 \ud06c\uae30 \uc870\uc815 \ud504\ub85c\uc138\uc2a4\ub294 O(n)\uc758 \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub97c \uac16\uc2b5\ub2c8\ub2e4. \uc5ec\uae30\uc11c n\uc740 \uc694\uc18c \uc218\uc785\ub2c8\ub2e4.<\/p>\r\n\r\n\r\n\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\uc694\uc18c \ubc18\ubcf5<\/h3>\r\n\r\n\r\n\r\n<p>\ud5a5\uc0c1\ub41c for \ub8e8\ud504\ub098 \ubc18\ubcf5\uc790\ub97c \uc0ac\uc6a9\ud558\uc5ec ArrayList\uc758 \uc694\uc18c\ub97c \ubc18\ubcf5\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\r\n\r\n\r\n\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Null \uac12 \ubc0f \uc911\ubcf5<\/h3>\r\n\r\n\r\n\r\n<p>ArrayList\ub294 null \uac12\uc744 \uc800\uc7a5\ud560 \uc218 \uc788\uc73c\uba70 \uc911\ubcf5 \uc694\uc18c\ub3c4 \uc800\uc7a5\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\r\n\r\n\r\n\r\n<p>\ub2e4\uc74c\uc740 Java\uc5d0\uc11c ArrayList\ub97c \uc0ac\uc6a9\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud55c \uc608\uc785\ub2c8\ub2e4.<\/p>\r\n\r\n\r\n\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" style=\"font-size: .875rem; font-family: Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace; line-height: 1.25rem;\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\">\r\n<pre class=\"shiki nord\" style=\"background-color: #2e3440ff;\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #81a1c1;\">import<\/span> <span style=\"color: #8fbcbb;\">java<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #8fbcbb;\">util<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #8fbcbb;\">ArrayList<\/span><span style=\"color: #81a1c1;\">;<\/span><\/span>\r\n\r\n<span class=\"line\"><span style=\"color: #81a1c1;\">public<\/span> <span style=\"color: #81a1c1;\">class<\/span> <span style=\"color: #8fbcbb;\">ArrayListExample<\/span> <span style=\"color: #eceff4;\">{<\/span><\/span>\r\n<span class=\"line\">    <span style=\"color: #81a1c1;\">public<\/span> <span style=\"color: #81a1c1;\">static<\/span> <span style=\"color: #81a1c1;\">void<\/span> <span style=\"color: #88c0d0;\">main<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #8fbcbb;\">String<\/span><span style=\"color: #eceff4;\">[]<\/span> <span style=\"color: #d8dee9;\">args<\/span><span style=\"color: #eceff4;\">)<\/span> <span style=\"color: #eceff4;\">{<\/span><\/span>\r\n<span class=\"line\">        <span style=\"color: #8fbcbb;\">ArrayList<\/span><span style=\"color: #eceff4;\">&lt;<\/span><span style=\"color: #8fbcbb;\">String<\/span><span style=\"color: #eceff4;\">&gt;<\/span> <span style=\"color: #d8dee9;\">fruits<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #81a1c1;\">new<\/span> <span style=\"color: #8fbcbb;\">ArrayList<\/span><span style=\"color: #eceff4;\">&lt;&gt;()<\/span><span style=\"color: #81a1c1;\">;<\/span><\/span>\r\n        \r\n<span class=\"line\">        <span style=\"color: #616e88;\">\/\/ Adding elements<\/span><\/span>\r\n<span class=\"line\">        <span style=\"color: #d8dee9;\">fruits<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">add<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">Apple<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span><\/span>\r\n<span class=\"line\">        <span style=\"color: #d8dee9;\">fruits<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">add<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">Banana<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span><\/span>\r\n<span class=\"line\">        <span style=\"color: #d8dee9;\">fruits<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">add<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">Orange<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span><\/span>\r\n        \r\n<span class=\"line\">        <span style=\"color: #616e88;\">\/\/ Accessing elements<\/span><\/span>\r\n<span class=\"line\">        <span style=\"color: #d8dee9;\">System<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #d8dee9;\">out<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">println<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">First fruit: <\/span><span style=\"color: #eceff4;\">\"<\/span> <span style=\"color: #81a1c1;\">+<\/span> <span style=\"color: #d8dee9;\">fruits<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">get<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #b48ead;\">0<\/span><span style=\"color: #eceff4;\">))<\/span><span style=\"color: #81a1c1;\">;<\/span><\/span>\r\n        \r\n<span class=\"line\">        <span style=\"color: #616e88;\">\/\/ Iterating through elements<\/span><\/span>\r\n<span class=\"line\">        <span style=\"color: #81a1c1;\">for<\/span> <span style=\"color: #eceff4;\">(<\/span><span style=\"color: #8fbcbb;\">String<\/span> <span style=\"color: #d8dee9;\">fruit<\/span> <span style=\"color: #81a1c1;\">:<\/span><span style=\"color: #d8dee9ff;\"> fruits<\/span><span style=\"color: #eceff4;\">)<\/span> <span style=\"color: #eceff4;\">{<\/span><\/span>\r\n<span class=\"line\">            <span style=\"color: #d8dee9;\">System<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #d8dee9;\">out<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">println<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #d8dee9ff;\">fruit<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span><\/span>\r\n<span class=\"line\">        <span style=\"color: #eceff4;\">}<\/span><\/span>\r\n        \r\n<span class=\"line\">        <span style=\"color: #616e88;\">\/\/ Removing an element<\/span><\/span>\r\n<span class=\"line\">        <span style=\"color: #d8dee9;\">fruits<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">remove<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #b48ead;\">1<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Removes \"Banana\"<\/span><\/span>\r\n        \r\n<span class=\"line\">        <span style=\"color: #d8dee9;\">System<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #d8dee9;\">out<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">println<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">Size after removal: <\/span><span style=\"color: #eceff4;\">\"<\/span> <span style=\"color: #81a1c1;\">+<\/span> <span style=\"color: #d8dee9;\">fruits<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">size<\/span><span style=\"color: #eceff4;\">())<\/span><span style=\"color: #81a1c1;\">;<\/span><\/span>\r\n<span class=\"line\">    <span style=\"color: #eceff4;\">}<\/span><\/span>\r\n<span class=\"line\"><span style=\"color: #eceff4;\">}<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<p>&nbsp;<\/p>\r\n<center><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-4435445268668222\" crossorigin=\"anonymous\"><\/script> <!-- [\ub514\uc2a4\ud50c\ub808\uc774 \uad11\uace0] \ubc18\uc751\ud615 \uc6cc\ub4dc\ud504\ub808\uc2a4 \ubcf8\ubb38 --> <ins class=\"adsbygoogle\" style=\"display: block;\" data-ad-client=\"ca-pub-4435445268668222\" data-ad-slot=\"9091536397\" data-ad-format=\"auto\" data-full-width-responsive=\"true\"><\/ins> <script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/center>\r\n<p>&nbsp;<\/p>\r\n\r\n<p>&nbsp;<\/p>\r\n\r\n<p>&#8216;ArrayList&#8217;\ub294 \ub3d9\uc801 \ud06c\uae30 \uc870\uc815\uacfc \ud3b8\ub9ac\ud55c \ubc29\ubc95\uc744 \uc81c\uacf5\ud558\uc9c0\ub9cc \ud06c\uae30 \uc870\uc815 \uba54\ucee4\ub2c8\uc998\uc740 \ub300\uaddc\ubaa8 \uceec\ub809\uc158\uc744 \ucc98\ub9ac\ud560 \ub54c \uc131\ub2a5\uc5d0 \uc601\ud5a5\uc744 \ubbf8\uce60 \uc218 \uc788\ub2e4\ub294 \uc810\uc744 \uae30\uc5b5\ud558\uc138\uc694. \uc694\uc18c\ub97c \uc790\uc8fc \uc0bd\uc785\ud558\uac70\ub098 \uc81c\uac70\ud560 \ud544\uc694\uac00 \uc5c6\uace0 \uceec\ub809\uc158 \ud06c\uae30\uac00 \uace0\uc815\ub41c \uacbd\uc6b0 \uc77c\ubc18 \ubc30\uc5f4\uc774 \ub354 \ud6a8\uc728\uc801\uc77c \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; &nbsp; ArrayList Java\uc5d0\uc11c ArrayList\ub294 \uae30\uc874 \ubc30\uc5f4\uc5d0 \ube44\ud574 \ubc30\uc5f4\uc744 \uc0ac\uc6a9\ud558\ub294 &#8230;<\/p>\n","protected":false},"author":1,"featured_media":126,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rank_math_lock_modified_date":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-125","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programming"],"_links":{"self":[{"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/posts\/125"}],"collection":[{"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/comments?post=125"}],"version-history":[{"count":3,"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/posts\/125\/revisions"}],"predecessor-version":[{"id":516,"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/posts\/125\/revisions\/516"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/media\/126"}],"wp:attachment":[{"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/media?parent=125"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/categories?post=125"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/tags?post=125"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}