{"id":57,"date":"2023-08-18T17:16:30","date_gmt":"2023-08-18T08:16:30","guid":{"rendered":"https:\/\/blog.mumooinfo.com\/?p=57"},"modified":"2023-10-10T23:06:07","modified_gmt":"2023-10-10T14:06:07","slug":"java%ec%9d%98-string-class","status":"publish","type":"post","link":"https:\/\/mumooinfo.com\/programming\/java%ec%9d%98-string-class\/","title":{"rendered":"JAVA\uc758 String Class"},"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-58 aligncenter\" src=\"https:\/\/mumooinfo.com\/wp-content\/uploads\/2023\/08\/\uc81c\ubaa9\uc744-\uc785\ub825\ud574\uc8fc\uc138\uc694_-001-1-1.jpg\" alt=\"\" srcset=\"https:\/\/mumooinfo.com\/wp-content\/uploads\/2023\/08\/\uc81c\ubaa9\uc744-\uc785\ub825\ud574\uc8fc\uc138\uc694_-001-1-1.jpg 533w, https:\/\/mumooinfo.com\/wp-content\/uploads\/2023\/08\/\uc81c\ubaa9\uc744-\uc785\ub825\ud574\uc8fc\uc138\uc694_-001-1-1-300x300.jpg 300w, https:\/\/mumooinfo.com\/wp-content\/uploads\/2023\/08\/\uc81c\ubaa9\uc744-\uc785\ub825\ud574\uc8fc\uc138\uc694_-001-1-1-150x150.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\">String \ud074\ub798\uc2a4<\/h2>\r\n\r\n\r\n\r\n<p>Java\uc758 String \ud074\ub798\uc2a4\ub294 Java \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc5d0\uc11c \uae30\ubcf8\uc801\uc774\uace0 \ub110\ub9ac \uc0ac\uc6a9\ub418\ub294 \ud074\ub798\uc2a4\uc785\ub2c8\ub2e4. \uc77c\ub828\uc758 \ubb38\uc790\ub97c \ub098\ud0c0\ub0b4\ubbc0\ub85c \uac1c\ubc1c\uc790\uac00 \ub2e4\uc591\ud55c \ubc29\uc2dd\uc73c\ub85c \ud14d\uc2a4\ud2b8 \ub370\uc774\ud130\ub85c \uc791\uc5c5\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub2e4\uc74c\uc740 String \ud074\ub798\uc2a4\uc758 \uba87 \uac00\uc9c0 \ud575\uc2ec \uc0ac\ud56d\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\">\ubd88\ubcc0\uc131(Immutable Nature)<\/h3>\r\n\r\n\r\n\r\n<p>Java\uc5d0\uc11c a\uc758 \uac00\uc7a5 \uc911\uc694\ud55c \ud2b9\uc9d5 \uc911 \ud558\ub098\ub294 String \ubd88\ubcc0\uc131\uc785\ub2c8\ub2e4. \uac1d\uccb4\uac00 \uc0dd\uc131 \ub418\uba74 String\ud574\ub2f9 \uac12\uc744 \ubcc0\uacbd\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4. \uc218\uc815\ud558\ub294 \uac83\ucc98\ub7fc \ubcf4\uc774\ub294 \uc791\uc5c5\uc740 \uc2e4\uc81c\ub85c \uc218\uc815\ub41c \uac12\uc73c\ub85c String\uc0c8 \uac1c\uccb4\ub97c \ub9cc\ub4ed\ub2c8\ub2e4 . String\uc774 \ubd88\ubcc0\uc131\uc740 \uba54\ubaa8\ub9ac \uad00\ub9ac \ubc0f \uc2a4\ub808\ub4dc \uc548\uc804\uc5d0 \uc911\uc694\ud55c \uc601\ud5a5\uc744 \ubbf8\uce69\ub2c8\ub2e4.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\ubb38\uc790\uc5f4 \ub9cc\ub4e4\uae30<\/h3>\r\n\r\n\r\n\r\n<p>Java\uc5d0\uc11c \ubb38\uc790\uc5f4\uc740 \ub2e4\uc591\ud55c \ubc29\ubc95\uc744 \uc0ac\uc6a9\ud558\uc5ec \ub9cc\ub4e4 \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<h4 class=\"wp-block-heading\">\ubb38\uc790\uc5f4 \ub9ac\ud130\ub7f4<\/h4>\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: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">Hello, World!<\/span><span style=\"color: #eceff4;\">\"<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">new \ud0a4\uc6cc\ub4dc \uc0ac\uc6a9<\/h4>\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: #8fbcbb;\">String<\/span> <span style=\"color: #d8dee9;\">str<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #81a1c1;\">new<\/span> <span style=\"color: #88c0d0;\">String<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">Hello<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">StringBuilder<\/h4>\r\n\r\n\r\n\r\n<p>\uc774 \ud074\ub798\uc2a4\ub294 \ubcc0\uacbd \uac00\ub2a5\ud55c \ubb38\uc790\uc5f4\uc744 \ub9cc\ub4dc\ub294 \ub370 \uc0ac\uc6a9\ub418\uba70 \ubb38\uc790\uc5f4\uc744 \ub3d9\uc801\uc73c\ub85c \uad6c\uc131\ud560 \ub54c \uc885\uc885 \ub354 \ud6a8\uc728\uc801\uc785\ub2c8\ub2e4.<\/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: #8fbcbb;\">StringBuffer<\/span> <span style=\"color: #d8dee9;\">sb<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #81a1c1;\">new<\/span> <span style=\"color: #88c0d0;\">StringBuffer<\/span><span style=\"color: #eceff4;\">()<\/span><span style=\"color: #81a1c1;\">;<\/span><\/span>\r\n<span class=\"line\"><span style=\"color: #d8dee9;\">sb<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">append<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">hello<\/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;\">sb<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">append<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/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;\">sb<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">append<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">world<\/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: #8fbcbb;\">String<\/span> <span style=\"color: #d8dee9;\">resultStr<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">sb<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">toString<\/span><span style=\"color: #eceff4;\">()<\/span><span style=\"color: #81a1c1;\">;<\/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;\">resultStr<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span>  <span style=\"color: #616e88;\">\/\/ \"hello world\" \ucd9c\ub825<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\ubb38\uc790\uc5f4 \uc5f0\uacb0<\/h3>\r\n\r\n\r\n\r\n<p>+ \uc5f0\uc0b0\uc790\ub97c \uc0ac\uc6a9\ud558\uc5ec \ubb38\uc790\uc5f4\uc744 \uc5f0\uacb0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/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: #8fbcbb;\">String<\/span> <span style=\"color: #d8dee9;\">strName1<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">kim<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #81a1c1;\">;<\/span><\/span>\r\n<span class=\"line\"><span style=\"color: #8fbcbb;\">String<\/span> <span style=\"color: #d8dee9;\">strName2<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">mumoo<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #81a1c1;\">;<\/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;\">strName1 <\/span><span style=\"color: #81a1c1;\">+<\/span><span style=\"color: #d8dee9ff;\"> strName2 <\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span>  <span style=\"color: #616e88;\">\/\/ \"kimmumoo\" \ucd9c\ub825<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\ubb38\uc790\uc5f4 \ud568\uc218<\/h3>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">length()\uba54\uc11c\ub4dc<\/h4>\r\n\r\n\r\n\r\n<p>\uc774 \uba54\uc11c\ub4dc\ub294 \ud3ec\ud568\ub41c \ubb38\uc790 \uc218\uc778 \ubb38\uc790\uc5f4\uc758 \uae38\uc774\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4.<\/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: #8fbcbb;\">String<\/span> <span style=\"color: #d8dee9;\">str<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">Hello, World!<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #81a1c1;\">int<\/span> <span style=\"color: #d8dee9;\">length<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">str<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">length<\/span><span style=\"color: #eceff4;\">()<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns 13<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">charAt(int index)\uba54\uc11c\ub4dc<\/h4>\r\n\r\n\r\n\r\n<p>\uc774 \uba54\uc11c\ub4dc\ub294 \ubb38\uc790\uc5f4 \ub0b4\uc758 \uc9c0\uc815\ub41c \uc778\ub371\uc2a4\uc5d0 \uc788\ub294 \ubb38\uc790\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4.<\/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;\">char<\/span> <span style=\"color: #d8dee9;\">ch<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">str<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">charAt<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #b48ead;\">7<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns 'W'<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">substring \uba54\uc11c\ub4dc<\/h4>\r\n\r\n\r\n\r\n<p>\uc774 substring() \uba54\uc11c\ub4dc\ub294 \ubb38\uc790\uc5f4\uc758 \uc77c\ubd80\ub97c \ucd94\ucd9c\ud569\ub2c8\ub2e4.<\/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: #8fbcbb;\">String<\/span> <span style=\"color: #d8dee9;\">sub1<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">str<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">substring<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #b48ead;\">7<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns \"World!\" <\/span><\/span>\r\n<span class=\"line\"><span style=\"color: #8fbcbb;\">String<\/span> <span style=\"color: #d8dee9;\">sub2<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">str<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">substring<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #b48ead;\">0<\/span><span style=\"color: #eceff4;\">,<\/span> <span style=\"color: #b48ead;\">5<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns \"Hello\"<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">indexOf(String str) \ubc0f lastIndexOf(String str)\ubc29\ubc95<\/h4>\r\n\r\n\r\n\r\n<p>\uc774 \ubc29\ubc95\uc740 \ubb38\uc790\uc5f4 \ub0b4\uc5d0\uc11c \uc9c0\uc815\ub41c \ud558\uc704 \ubb38\uc790\uc5f4\uc758 \uccab \ubc88\uc9f8 \ubc1c\uc0dd \ub610\ub294 \ub9c8\uc9c0\ub9c9 \ubc1c\uc0dd \uc778\ub371\uc2a4\ub97c \ucc3e\ub294 \ub370 \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/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;\">int<\/span> <span style=\"color: #d8dee9;\">firstIndex<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">str<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">indexOf<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">l<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns 2 <\/span><\/span>\r\n<span class=\"line\"><span style=\"color: #81a1c1;\">int<\/span> <span style=\"color: #d8dee9;\">lastIndex<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">str<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">lastIndexOf<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">l<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns 10<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">startsWith \ubc0f endsWith\ubc29\ubc95<\/h4>\r\n\r\n\r\n\r\n<p>\uc774 \ubc29\ubc95\uc740 \ubb38\uc790\uc5f4\uc774 \uc8fc\uc5b4\uc9c4 \uc811\ub450\uc0ac\ub85c \uc2dc\uc791\ud558\ub294\uc9c0 \ub610\ub294 \uc8fc\uc5b4\uc9c4 \uc811\ubbf8\uc0ac\ub85c \ub05d\ub098\ub294\uc9c0\ub97c \uacb0\uc815\ud569\ub2c8\ub2e4.<\/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;\">boolean<\/span> <span style=\"color: #d8dee9;\">startsWith<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">str<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">startsWith<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">Hello<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns true <\/span><\/span>\r\n<span class=\"line\"><span style=\"color: #81a1c1;\">boolean<\/span> <span style=\"color: #d8dee9;\">endsWith<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">str<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">endsWith<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">World!<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns false<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">toUpperCase()\ubc0f toLowerCase()\uba54\uc11c\ub4dc<\/h4>\r\n\r\n\r\n\r\n<p>\uc774\ub7ec\ud55c \uba54\uc11c\ub4dc\ub294 \ubaa8\ub4e0 \ubb38\uc790\uac00 \ub300\ubb38\uc790 \ub610\ub294 \uc18c\ubb38\uc790\ub85c \ubcc0\ud658\ub41c \uc0c8 \ubb38\uc790\uc5f4\uc744 \ubc18\ud658\ud569\ub2c8\ub2e4.<\/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: #8fbcbb;\">String<\/span> <span style=\"color: #d8dee9;\">upperCase<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">str<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">toUpperCase<\/span><span style=\"color: #eceff4;\">()<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns \"HELLO, WORLD!\" <\/span><\/span>\r\n<span class=\"line\"><span style=\"color: #8fbcbb;\">String<\/span> <span style=\"color: #d8dee9;\">lowerCase<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">str<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">toLowerCase<\/span><span style=\"color: #eceff4;\">()<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns \"hello, world!\"<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">trim()\uba54\uc11c\ub4dc<\/h4>\r\n\r\n\r\n\r\n<p>\uc774 \uba54\uc11c\ub4dc\ub294 \uc120\ud589 \ubc0f \ud6c4\ud589 \uacf5\ubc31\uc774 \uc81c\uac70\ub41c \uc0c8 \ubb38\uc790\uc5f4\uc744 \ubc18\ud658\ud569\ub2c8\ub2e4.<\/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: #8fbcbb;\">String<\/span> <span style=\"color: #d8dee9;\">spacedStr<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\"> Hello <\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #81a1c1;\">;<\/span> <\/span>\r\n<span class=\"line\"><span style=\"color: #8fbcbb;\">String<\/span> <span style=\"color: #d8dee9;\">trimmedStr<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">spacedStr<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">trim<\/span><span style=\"color: #eceff4;\">()<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns \"Hello\"<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">replace(char oldChar, char newChar)\ubc0f replace(CharSequence target, CharSequence replacement)\uba54\uc18c\ub4dc<\/h4>\r\n\r\n\r\n\r\n<p>\uc774 \uba54\uc18c\ub4dc\ub294 \uc9c0\uc815\ub41c \ubb38\uc790 \ub610\ub294 \uc2dc\ud000\uc2a4\uc758 \ubaa8\ub4e0 \ud56d\ubaa9\uc774 \ub2e4\ub978 \ubb38\uc790 \ub610\ub294 \uc2dc\ud000\uc2a4\ub85c \ub300\uccb4\ub41c \uc0c8 \ubb38\uc790\uc5f4\uc744 \ubc18\ud658\ud569\ub2c8\ub2e4.<\/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: #8fbcbb;\">String<\/span> <span style=\"color: #d8dee9;\">replacedStr<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">str<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">replace<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">'<\/span><span style=\"color: #a3be8c;\">l<\/span><span style=\"color: #eceff4;\">'<\/span><span style=\"color: #eceff4;\">,<\/span> <span style=\"color: #eceff4;\">'<\/span><span style=\"color: #a3be8c;\">L<\/span><span style=\"color: #eceff4;\">'<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns \"HeLLo, WorLd!\"<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">split(String regex)\uba54\uc11c\ub4dc<\/h4>\r\n\r\n\r\n\r\n<p>\uc774 \uba54\uc11c\ub4dc\ub294 \uc81c\uacf5\ub41c \uc815\uaddc\uc2dd \uad6c\ubd84 \uae30\ud638\ub97c \uae30\ubc18\uc73c\ub85c \ubb38\uc790\uc5f4\uc744 \ud558\uc704 \ubb38\uc790\uc5f4 \ubc30\uc5f4\ub85c \ubd84\ud560\ud569\ub2c8\ub2e4.<\/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: #8fbcbb;\">String<\/span><span style=\"color: #eceff4;\">[]<\/span> <span style=\"color: #d8dee9;\">parts<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">str<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">split<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">, <\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns [\"Hello\", \"World!\"]<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">format(String format, Object&#8230; args)\ubc29\ubc95<\/h4>\r\n\r\n\r\n\r\n<p>\uc774 \ubc29\ubc95\uc740 <code>printf<\/code>C\uc758 \ud568\uc218 \uc640 \uc720\uc0ac\ud558\uac8c \uc790\ub9ac \ud45c\uc2dc\uc790\uc640 \ud615\uc2dd \uc9c0\uc815\uc790\ub97c \uc0ac\uc6a9\ud558\uc5ec \ubb38\uc790\uc5f4 \ud615\uc2dd\uc744 \uc9c0\uc815\ud558\ub294 \ub370 \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/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: #8fbcbb;\">String<\/span> <span style=\"color: #d8dee9;\">formatted<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">String<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">format<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">Value: %d, Text: %s<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #eceff4;\">,<\/span> <span style=\"color: #b48ead;\">42<\/span><span style=\"color: #eceff4;\">,<\/span> <span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">Hello<\/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: #616e88;\">\/\/ Returns \"Value: 42, Text: Hello\"<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">equals()\ubc29\ubc95<\/h4>\r\n\r\n\r\n\r\n<p>\uc774 \ubc29\ubc95\uc740 \ub450 \ubb38\uc790\uc5f4\uc758 \ub0b4\uc6a9\uc774 \ub3d9\uc77c\ud55c\uc9c0 \ud655\uc778\ud569\ub2c8\ub2e4. \ucf58\ud150\uce20 \ube44\uad50\uc5d0 \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/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;\">boolean<\/span> <span style=\"color: #d8dee9;\">isEqual<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">str<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">equals<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">Hello, World!<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns true<\/span><\/span><\/code><\/pre>\r\n<\/div>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">compareTo(String anotherString)\ubc29\ubc95<\/h4>\r\n\r\n\r\n\r\n<p>\uc774 \ubc29\ubc95\uc740 \ub450 \ubb38\uc790\uc5f4\uc744 \uc0ac\uc804\uc21c\uc73c\ub85c \ube44\uad50\ud569\ub2c8\ub2e4. \ud638\ucd9c \ubb38\uc790\uc5f4\uc774 \uc778\uc218 \ubb38\uc790\uc5f4 \uc55e\uc5d0 \uc624\uba74 \uc74c\uc218 \uac12, \ub4a4\uc5d0 \uc624\uba74 \uc591\uc218 \uac12, \uac19\uc73c\uba74 0\uc744 \ubc18\ud658\ud569\ub2c8\ub2e4.<\/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;\">int<\/span> <span style=\"color: #d8dee9;\">comparison<\/span> <span style=\"color: #81a1c1;\">=<\/span> <span style=\"color: #d8dee9;\">str<\/span><span style=\"color: #eceff4;\">.<\/span><span style=\"color: #88c0d0;\">compareTo<\/span><span style=\"color: #eceff4;\">(<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #a3be8c;\">Goodbye<\/span><span style=\"color: #eceff4;\">\"<\/span><span style=\"color: #eceff4;\">)<\/span><span style=\"color: #81a1c1;\">;<\/span> <span style=\"color: #616e88;\">\/\/ Returns a positive value<\/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>\uc804\ubc18\uc801\uc73c\ub85c \uc774 String\ud074\ub798\uc2a4\ub294 Java API\uc758 \uae30\ubcf8 \ubd80\ubd84\uc774\uba70 \ud14d\uc2a4\ud2b8 \ub370\uc774\ud130\ub97c \ucc98\ub9ac\ud558\uace0 \ub2e4\uc591\ud55c \ubb38\uc790\uc5f4 \uc870\uc791 \uc791\uc5c5\uc744 \uc218\ud589\ud558\uae30 \uc704\ud574 Java \ud504\ub85c\uadf8\ub7a8\uc5d0\uc11c \uad11\ubc94\uc704\ud558\uac8c \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \uc911\uc694\uc131\uacfc \ube48\ubc88\ud55c \uc0ac\uc6a9\uc73c\ub85c \uc778\ud574 String\ud074\ub798\uc2a4\uc758 \ud2b9\uc131\uacfc \uba54\uc11c\ub4dc\ub97c \uc774\ud574\ud558\ub294 \uac83\uc740 Java \uac1c\ubc1c\uc790\uc5d0\uac8c \ub9e4\uc6b0 \uc911\uc694\ud569\ub2c8\ub2e4.<\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; &nbsp; String \ud074\ub798\uc2a4 Java\uc758 String \ud074\ub798\uc2a4\ub294 Java \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc5d0\uc11c &#8230;<\/p>\n","protected":false},"author":1,"featured_media":58,"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-57","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programming"],"_links":{"self":[{"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/posts\/57"}],"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=57"}],"version-history":[{"count":2,"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/posts\/57\/revisions"}],"predecessor-version":[{"id":541,"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/posts\/57\/revisions\/541"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/media\/58"}],"wp:attachment":[{"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/media?parent=57"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/categories?post=57"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mumooinfo.com\/wp-json\/wp\/v2\/tags?post=57"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}