{"id":93298,"date":"2025-11-28T22:41:36","date_gmt":"2025-11-28T15:41:36","guid":{"rendered":"https:\/\/itviec.com\/blog\/?p=93298"},"modified":"2025-11-28T22:41:40","modified_gmt":"2025-11-28T15:41:40","slug":"huong-dan-switch-case-java","status":"publish","type":"post","link":"https:\/\/itviec.com\/blog\/huong-dan-switch-case-java\/","title":{"rendered":"Switch case Java: L\u00e0m ch\u1ee7 Switch Expression trong Java"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed9i dung b\u00e0i vi\u1ebft<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/itviec.com\/blog\/huong-dan-switch-case-java\/#Switch_Case_la_gi_Khi_nao_su_dung_Switch_Case\" >Switch Case l\u00e0 g\u00ec? Khi n\u00e0o s\u1eed d\u1ee5ng Switch Case?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/itviec.com\/blog\/huong-dan-switch-case-java\/#Switch_Case_truyen_thong\" >Switch Case truy\u1ec1n th\u1ed1ng<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/itviec.com\/blog\/huong-dan-switch-case-java\/#Switch_Expression_Tu_Java_version_14\" >Switch Expression (T\u1eeb Java version 14)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/itviec.com\/blog\/huong-dan-switch-case-java\/#Meo_giup_code_sach_hon_khi_dung_cau_truc_switch\" >M\u1eb9o gi\u00fap code s\u1ea1ch h\u01a1n khi d\u00f9ng c\u1ea5u tr\u00fac switch<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/itviec.com\/blog\/huong-dan-switch-case-java\/#Cac_cau_hoi_thuong_gap_ve_switch_case_Java\" >C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 switch case Java<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/itviec.com\/blog\/huong-dan-switch-case-java\/#Tong_ket\" >T\u1ed5ng k\u1ebft<\/a><\/li><\/ul><\/nav><\/div>\n\n<p><strong><em>Trong l\u1eadp tr\u00ecnh Java, c\u00e1c c\u1ea5u tr\u00fac \u0111i\u1ec1u khi\u1ec3n l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t quy\u1ebft \u0111\u1ecbnh lu\u1ed3ng ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ch\u01b0\u01a1ng tr\u00ecnh. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o m\u1ed9t trong nh\u1eefng c\u1ea5u tr\u00fac m\u1ea1nh m\u1ebd nh\u1ea5t \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c quy\u1ebft \u0111\u1ecbnh d\u1ef1a tr\u00ean nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n: c\u00e2u l\u1ec7nh <code>switch<\/code>. Ch\u00fang ta s\u1ebd c\u00f9ng nhau kh\u00e1m ph\u00e1 <code>switch case<\/code> Java truy\u1ec1n th\u1ed1ng, t\u00ecm hi\u1ec3u c\u00e1ch n\u00f3 kh\u1eafc ph\u1ee5c s\u1ef1 ph\u1ee9c t\u1ea1p v\u00e0 kh\u00f3 qu\u1ea3n l\u00fd c\u1ee7a chu\u1ed7i <code>if-else if-else<\/code> k\u00e9o d\u00e0i.<\/em><\/strong><\/p>\n\n\n\n<p>\u0110\u1ecdc b\u00e0i vi\u1ebft \u0111\u1ec3 hi\u1ec3u th\u00eam v\u1ec1:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Khi n\u00e0o s\u1eed d\u1ee5ng Switch Case?<\/li>\n\n\n\n<li>Switch Case Java truy\u1ec1n th\u1ed1ng: bao g\u1ed3m c\u00e1c c\u00fa ph\u00e1p, c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u h\u1ed7 tr\u1ee3 v\u00e0 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng<\/li>\n\n\n\n<li>Switch Expression (T\u1eeb Java version 14)<\/li>\n\n\n\n<li>M\u1eb9o gi\u00fap code s\u1ea1ch h\u01a1n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-switch-case-la-gi-khi-nao-s\u1eed-d\u1ee5ng-switch-case\"><span class=\"ez-toc-section\" id=\"Switch_Case_la_gi_Khi_nao_su_dung_Switch_Case\"><\/span><strong>Switch Case l\u00e0 g\u00ec? Khi n\u00e0o s\u1eed d\u1ee5ng Switch Case?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u1ea5u tr\u00fac <code>switch case<\/code> l\u00e0 m\u1ed9t l\u1ec7nh \u0111i\u1ec1u khi\u1ec3n lu\u1ed3ng, \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 so s\u00e1nh m\u1ed9t bi\u1ebfn duy nh\u1ea5t v\u1edbi m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c gi\u00e1 tr\u1ecb c\u1ed1 \u0111\u1ecbnh, cung c\u1ea5p gi\u1ea3i ph\u00e1p g\u1ecdn g\u00e0ng h\u01a1n cho chu\u1ed7i <code>if-else if-else<\/code> k\u00e9o d\u00e0i.\u00a0<\/p>\n\n\n\n<p>C\u1ea5u tr\u00fac <code>switch case<\/code> kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t gi\u1ea3i ph\u00e1p ho\u00e0n h\u1ea3o cho m\u1ecdi t\u00ecnh hu\u1ed1ng \u0111i\u1ec1u ki\u1ec7n, nh\u01b0ng n\u00f3 th\u1ef1c s\u1ef1 t\u1ecfa s\u00e1ng trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p c\u1ee5 th\u1ec3. Vi\u1ec7c hi\u1ec3u r\u00f5 \u01b0u \u0111i\u1ec3m c\u1ee7a n\u00f3 s\u1ebd gi\u00fap b\u1ea1n vi\u1ebft code Java hi\u1ec7u qu\u1ea3 v\u00e0 d\u1ec5 b\u1ea3o tr\u00ec h\u01a1n.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><em>\u0110\u1ecdc chi ti\u1ebft: <strong><a href=\"https:\/\/itviec.com\/blog\/cac-cau-lenh-trong-java\/\" target=\"_blank\" rel=\"noreferrer noopener\">C\u00e1c c\u00e2u l\u1ec7nh trong Java: Chi ti\u1ebft t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao<\/a><\/strong><\/em><\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-so-sanh-switch-case-va-if-else-if-else\"><strong>So s\u00e1nh switch case v\u00e0 if-else if-else<\/strong><\/h3>\n\n\n\n<p>Vi\u1ec7c l\u1ef1a ch\u1ecdn gi\u1eefa <code>switch<\/code> v\u00e0 <code>if-else<\/code> ph\u1ee5 thu\u1ed9c v\u00e0o b\u1ea3n ch\u1ea5t c\u1ee7a \u0111i\u1ec1u ki\u1ec7n b\u1ea1n mu\u1ed1n ki\u1ec3m tra.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Ti\u00eau ch\u00ed<\/strong><\/td><td><strong>Switch case&nbsp;<\/strong><\/td><td><strong>if-else<\/strong><\/td><\/tr><tr><td><strong>Lo\u1ea1i so s\u00e1nh<\/strong><\/td><td>So s\u00e1nh m\u1ed9t bi\u1ebfn duy nh\u1ea5t v\u1edbi nhi\u1ec1u gi\u00e1 tr\u1ecb c\u1ed1 \u0111\u1ecbnh (so s\u00e1nh b\u1eb1ng <code>==<\/code>).<\/td><td>Cho ph\u00e9p so s\u00e1nh ph\u1ee9c t\u1ea1p h\u01a1n (v\u00ed d\u1ee5: <code>>=<\/code>, <code>&lt;=<\/code>, <code>&amp;&amp;<\/code>, <code>`<\/code>)<\/td><\/tr><tr><td><strong>Ki\u1ec3u d\u1eef li\u1ec7u<\/strong><\/td><td>H\u1ed7 tr\u1ee3 c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u c\u01a1 b\u1ea3n nh\u01b0 <code>int<\/code>, <code>char<\/code>, <code>byte<\/code>, <code>short<\/code>, v\u00e0 t\u1eeb Java 7 tr\u1edf \u0111i l\u00e0 <code>String<\/code> v\u00e0 ki\u1ec3u enum.<\/td><td>H\u1ed7 tr\u1ee3 so s\u00e1nh m\u1ecdi ki\u1ec3u d\u1eef li\u1ec7u, bao g\u1ed3m c\u1ea3 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng (non-primitive types) ph\u1ee9c t\u1ea1p.<\/td><\/tr><tr><td><strong>\u0110\u1ed9 r\u00f5 r\u00e0ng<\/strong><\/td><td>M\u00e3 ngu\u1ed3n th\u01b0\u1eddng ng\u1eafn g\u1ecdn v\u00e0 d\u1ec5 \u0111\u1ecdc h\u01a1n khi c\u00f3 nhi\u1ec1u h\u01a1n ba ho\u1eb7c b\u1ed1n \u0111i\u1ec1u ki\u1ec7n.<\/td><td>D\u1ec5 tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p v\u00e0 kh\u00f3 qu\u1ea3n l\u00fd khi c\u00f3 qu\u00e1 nhi\u1ec1u kh\u1ed1i <code>else if<\/code> l\u1ed3ng nhau.<\/td><\/tr><tr><td><strong>Hi\u1ec7u su\u1ea5t<\/strong><\/td><td>C\u00f3 th\u1ec3 c\u00f3 hi\u1ec7u su\u1ea5t t\u1ed1t h\u01a1n trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p v\u00ec tr\u00ecnh bi\u00ean d\u1ecbch Java c\u00f3 th\u1ec3 t\u1ed1i \u01b0u h\u00f3a th\u00e0nh b\u1ea3ng nh\u1ea3y (<em>jump table<\/em>) \u0111\u1ec3 truy c\u1eadp tr\u1ef1c ti\u1ebfp gi\u00e1 tr\u1ecb.<\/td><td>Ph\u1ea3i ki\u1ec3m tra t\u1eebng \u0111i\u1ec1u ki\u1ec7n m\u1ed9t theo tr\u00ecnh t\u1ef1, c\u00f3 th\u1ec3 ch\u1eadm h\u01a1n n\u1ebfu \u0111i\u1ec1u ki\u1ec7n \u0111\u00fang n\u1eb1m \u1edf cu\u1ed1i chu\u1ed7i.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-khi-nao-nen-dung-switch-case\"><strong>Khi n\u00e0o n\u00ean d\u00f9ng <\/strong><strong>switch case?<\/strong><\/h3>\n\n\n\n<p>B\u1ea1n n\u00ean \u01b0u ti\u00ean s\u1eed d\u1ee5ng <code>switch case<\/code> khi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>So s\u00e1nh m\u1ed9t bi\u1ebfn v\u1edbi nhi\u1ec1u gi\u00e1 tr\u1ecb c\u1ed1 \u0111\u1ecbnh<\/strong>: \u0110\u00e2y l\u00e0 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng l\u00fd t\u01b0\u1edfng. V\u00ed d\u1ee5, b\u1ea1n c\u1ea7n x\u1eed l\u00fd c\u00e1c h\u00e0nh \u0111\u1ed9ng kh\u00e1c nhau d\u1ef1a tr\u00ean m\u00e3 ng\u00e0y trong tu\u1ea7n (1 \u0111\u1ebfn 7) ho\u1eb7c m\u00e3 l\u1ed7i (200, 404, 500).<br><strong>V\u00ed d\u1ee5:<\/strong> Ki\u1ec3m tra gi\u00e1 tr\u1ecb c\u1ee7a m\u1ed9t bi\u1ebfn <code>thang<\/code> \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh s\u1ed1 ng\u00e0y trong th\u00e1ng \u0111\u00f3.<\/li>\n\n\n\n<li><strong>C\u1ea7n code ng\u1eafn g\u1ecdn v\u00e0 d\u1ec5 \u0111\u1ecdc:<\/strong> Khi chu\u1ed7i c\u00f3 nhi\u1ec1u if else tr\u1edf n\u00ean d\u00e0i d\u00f2ng v\u00e0 kh\u00f3 theo d\u00f5i, <code>switch<\/code> s\u1ebd l\u00e0 m\u1ed9t gi\u1ea3i ph\u00e1p tr\u1ef1c quan h\u01a1n.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-khi-nao-nen-dung-if-else\"><strong>Khi n\u00e0o n\u00ean d\u00f9ng <\/strong><strong>if-else?<\/strong><\/h3>\n\n\n\n<p>B\u1ea1n n\u00ean d\u00f9ng c\u1ea5u tr\u00fac <code>if-else<\/code> khi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>So s\u00e1nh ph\u1ee9c t\u1ea1p:<\/strong> B\u1ea1n c\u1ea7n ki\u1ec3m tra c\u00e1c \u0111i\u1ec1u ki\u1ec7n v\u1ec1 ph\u1ea1m vi (v\u00ed d\u1ee5: <code>diem &gt;= 50<\/code>), k\u1ebft h\u1ee3p nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n (<code>&amp;&amp;<\/code> ho\u1eb7c <code>||<\/code>), ho\u1eb7c so s\u00e1nh kh\u00f4ng b\u1eb1ng (<code>!=<\/code>).<\/li>\n\n\n\n<li><strong>So s\u00e1nh \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong> Khi b\u1ea1n c\u1ea7n ki\u1ec3m tra s\u1ef1 b\u1eb1ng nhau ho\u1eb7c c\u00e1c t\u00ednh ch\u1ea5t c\u1ee7a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng (ngo\u00e0i <code>String<\/code> v\u00e0 <code>enum<\/code>), \u0111\u1eb7c bi\u1ec7t l\u00e0 khi d\u00f9ng ph\u01b0\u01a1ng th\u1ee9c <code>equals()<\/code>.<\/li>\n<\/ul>\n\n\n\n<p>T\u00f3m l\u1ea1i, <strong><code>switch case<\/code> l\u00e0 c\u00f4ng c\u1ee5 t\u1ed1i \u01b0u cho vi\u1ec7c ch\u1ecdn m\u1ed9t trong nhi\u1ec1u \u0111\u01b0\u1eddng \u0111i d\u1ef1a tr\u00ean gi\u00e1 tr\u1ecb ch\u00ednh x\u00e1c c\u1ee7a m\u1ed9t bi\u1ebfn<\/strong>, gi\u00fap m\u00e3 ngu\u1ed3n c\u1ee7a b\u1ea1n tr\u1edf n\u00ean g\u1ecdn g\u00e0ng v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a t\u1ed1t h\u01a1n v\u1ec1 m\u1eb7t hi\u1ec7u su\u1ea5t.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-switch-case-truy\u1ec1n-th\u1ed1ng\"><span class=\"ez-toc-section\" id=\"Switch_Case_truyen_thong\"><\/span><strong>Switch Case truy\u1ec1n th\u1ed1ng<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><code>Switch case<\/code> truy\u1ec1n th\u1ed1ng l\u00e0 n\u1ec1n t\u1ea3ng m\u00e0 m\u1ecdi l\u1eadp tr\u00ecnh vi\u00ean Java \u0111\u1ec1u c\u1ea7n n\u1eafm v\u1eefng tr\u01b0\u1edbc khi chuy\u1ec3n sang c\u00e1c c\u1ea5u tr\u00fac hi\u1ec7n \u0111\u1ea1i h\u01a1n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-cu-phap-c\u01a1-b\u1ea3n\"><strong>C\u00fa ph\u00e1p c\u01a1 b\u1ea3n<\/strong><\/h3>\n\n\n\n<p>C\u00fa ph\u00e1p c\u1ee7a c\u00e2u l\u1ec7nh s<code>witch<\/code> truy\u1ec1n th\u1ed1ng r\u1ea5t \u0111\u01a1n gi\u1ea3n v\u00e0 d\u1ec5 hi\u1ec3u, cho ph\u00e9p b\u1ea1n ch\u1ec9 \u0111\u1ecbnh c\u00e1c kh\u1ed1i m\u00e3 kh\u00e1c nhau \u0111\u1ec3 th\u1ef1c thi d\u1ef1a tr\u00ean gi\u00e1 tr\u1ecb c\u1ee7a m\u1ed9t bi\u1ebfn.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>switch (bi\u1ec3u_th\u1ee9c) {\n    case gi\u00e1_tr\u1ecb_1:\n        \/\/ Kh\u1ed1i l\u1ec7nh 1\n        break; \/\/ T\u00f9y ch\u1ecdn, nh\u01b0ng r\u1ea5t quan tr\u1ecdng!\n    case gi\u00e1_tr\u1ecb_2:\n        \/\/ Kh\u1ed1i l\u1ec7nh 2\n        break;\n    \/\/ ...\n    default:\n        \/\/ Kh\u1ed1i l\u1ec7nh m\u1eb7c \u0111\u1ecbnh (n\u1ebfu kh\u00f4ng kh\u1edbp case n\u00e0o)\n        \/\/ break \u1edf \u0111\u00e2y l\u00e0 kh\u00f4ng c\u1ea7n thi\u1ebft, nh\u01b0ng c\u0169ng kh\u00f4ng sai\n}<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>switch (bi\u1ec3u_th\u1ee9c)<\/code>: Bi\u1ec3u th\u1ee9c \u0111\u01b0\u1ee3c \u0111\u1eb7t trong ngo\u1eb7c \u0111\u01a1n s\u1ebd \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1. Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c n\u00e0y s\u1ebd \u0111\u01b0\u1ee3c so s\u00e1nh l\u1ea7n l\u01b0\u1ee3t v\u1edbi c\u00e1c <code>case<\/code>.<\/li>\n\n\n\n<li><code>case gi\u00e1_tr\u1ecb<\/code>: \u0110\u00e2y l\u00e0 nh\u00e3n (label) \u0111\u1ec3 so s\u00e1nh. N\u1ebfu gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c kh\u1edbp v\u1edbi <code>gi\u00e1_tr\u1ecb<\/code> n\u00e0y, lu\u1ed3ng th\u1ef1c thi s\u1ebd nh\u1ea3y \u0111\u1ebfn kh\u1ed1i l\u1ec7nh n\u00e0y v\u00e0 ti\u1ebfp t\u1ee5c ch\u1ea1y t\u1eeb \u0111\u00f3.<\/li>\n\n\n\n<li><code>default<\/code>: Kh\u1ed1i l\u1ec7nh n\u00e0y l\u00e0 t\u00f9y ch\u1ecdn. N\u1ebfu gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c kh\u00f4ng kh\u1edbp v\u1edbi b\u1ea5t k\u1ef3 <code>case<\/code> n\u00e0o, lu\u1ed3ng th\u1ef1c thi s\u1ebd nh\u1ea3y \u0111\u1ebfn kh\u1ed1i <code>default<\/code> (n\u1ebfu c\u00f3).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-cac-ki\u1ec3u-d\u1eef-li\u1ec7u-h\u1ed7-tr\u1ee3\"><strong>C\u00e1c ki\u1ec3u d\u1eef li\u1ec7u h\u1ed7 tr\u1ee3<\/strong><\/h3>\n\n\n\n<p>Kh\u00f4ng ph\u1ea3i m\u1ecdi ki\u1ec3u d\u1eef li\u1ec7u \u0111\u1ec1u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e2u l\u1ec7nh switch. Java gi\u1edbi h\u1ea1n c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u c\u00f3 th\u1ec3 d\u00f9ng \u0111\u1ec3 l\u00e0m <strong>bi\u1ec3u th\u1ee9c<\/strong> trong switch() nh\u01b0 sau:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ki\u1ec3u s\u1ed1 nguy\u00ean:<\/strong> <code>byte<\/code>, <code>short<\/code>, <code>char<\/code>, v\u00e0 <code>int<\/code>.<\/li>\n\n\n\n<li><strong>Ki\u1ec3u \u0111\u1ed1i t\u01b0\u1ee3ng t\u01b0\u01a1ng \u1ee9ng (Wrapper Types):<\/strong> <code>Byte<\/code>, <code>Short<\/code>, <code>Character<\/code>, v\u00e0 <code>Integer<\/code>.<\/li>\n\n\n\n<li><strong>Ki\u1ec3u n\u00e2ng cao (t\u1eeb Java 5 v\u00e0 7):<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong><code>Enum<\/code> (t\u1eeb Java 5):<\/strong> Th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u1ea5t \u0111\u1ec3 so s\u00e1nh c\u00e1c h\u1eb1ng s\u1ed1.<\/li>\n\n\n\n<li><strong><code>String<\/code> (t\u1eeb Java 7):<\/strong> Cho ph\u00e9p so s\u00e1nh chu\u1ed7i m\u1ed9t c\u00e1ch tr\u1ef1c ti\u1ebfp.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>L\u01b0u \u00fd:<\/strong> C\u00e1c ki\u1ec3u d\u1eef li\u1ec7u nh\u01b0 <code>long<\/code>, <code>float<\/code>, <code>double<\/code>, v\u00e0 <code>boolean<\/code> <strong>kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p<\/strong> s\u1eed d\u1ee5ng trong c\u00e2u l\u1ec7nh <code>switch<\/code>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-khai-ni\u1ec7m-quan-tr\u1ecdng-break-va-fall-through\"><strong>Kh\u00e1i ni\u1ec7m quan tr\u1ecdng: break v\u00e0 Fall-through<\/strong><\/h3>\n\n\n\n<p>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a <code>switch case<\/code> \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi hai kh\u00e1i ni\u1ec7m then ch\u1ed1t n\u00e0y:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-vai-tro-c\u1ee7a-break\"><strong>Vai tr\u00f2 c\u1ee7a <\/strong><strong>break<\/strong><\/h4>\n\n\n\n<p>T\u1eeb kh\u00f3a b<code>reak<\/code> c\u00f3 vai tr\u00f2 t\u1ed1i quan tr\u1ecdng: n\u00f3 ng\u0103n ch\u1eb7n hi\u1ec7n t\u01b0\u1ee3ng Fall-through.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Khi Java t\u00ecm th\u1ea5y <code>case<\/code> kh\u1edbp, n\u00f3 b\u1eaft \u0111\u1ea7u th\u1ef1c thi c\u00e1c l\u1ec7nh trong kh\u1ed1i \u0111\u00f3.<\/li>\n\n\n\n<li>Khi g\u1eb7p t\u1eeb kh\u00f3a <code>break<\/code>, n\u00f3 ngay l\u1eadp t\u1ee9c tho\u00e1t ra kh\u1ecfi to\u00e0n b\u1ed9 c\u00e2u l\u1ec7nh <code>switch<\/code>.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-hi\u1ec7n-t\u01b0\u1ee3ng-fall-through\"><strong>Hi\u1ec7n t\u01b0\u1ee3ng Fall-through<\/strong><\/h4>\n\n\n\n<p>Fall-through l\u00e0 h\u00e0nh vi m\u1eb7c \u0111\u1ecbnh c\u1ee7a <code>switch case<\/code> khi kh\u00f4ng c\u00f3 t\u1eeb kh\u00f3a <code>break<\/code>.<\/p>\n\n\n\n<p>Sau khi m\u1ed9t <code>case<\/code> kh\u1edbp v\u00e0 \u0111\u01b0\u1ee3c th\u1ef1c thi, n\u1ebfu kh\u00f4ng c\u00f3 <code>break<\/code>, lu\u1ed3ng ch\u01b0\u01a1ng tr\u00ecnh s\u1ebd ti\u1ebfp t\u1ee5c ch\u1ea1y xu\u1ed1ng c\u00e1c kh\u1ed1i <code>case<\/code> k\u1ebf ti\u1ebfp, b\u1ea5t k\u1ec3 c\u00e1c <code>case<\/code> \u0111\u00f3 c\u00f3 kh\u1edbp v\u1edbi gi\u00e1 tr\u1ecb ban \u0111\u1ea7u hay kh\u00f4ng, cho \u0111\u1ebfn khi n\u00f3 g\u1eb7p <code>break<\/code> ho\u1eb7c k\u1ebft th\u00fac switch.<\/p>\n\n\n\n<p>Hi\u1ec7n t\u01b0\u1ee3ng Fall-through th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng c\u00f3 ch\u1ee7 \u0111\u00edch \u0111\u1ec3 g\u1ed9p nhi\u1ec1u <code>case<\/code> l\u1ea1i v\u1edbi nhau khi ch\u00fang c\u00f3 c\u00f9ng kh\u1ed1i l\u1ec7nh c\u1ea7n th\u1ef1c thi.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int day = 6; \/\/ Th\u1ee9 B\u1ea3y\nString dayType;\n\nswitch (day) {\n    case 6: \/\/ Th\u1ee9 B\u1ea3y\n    case 7: \/\/ Ch\u1ee7 Nh\u1eadt\n        dayType = \"Cu\u1ed1i tu\u1ea7n\";\n        break; \/\/ Tho\u00e1t kh\u1ecfi switch sau khi g\u00e1n\n    case 1:\n    case 2:\n    case 3:\n    case 4:\n    case 5:\n        dayType = \"Ng\u00e0y l\u00e0m vi\u1ec7c\";\n        break;\n    default:\n        dayType = \"Kh\u00f4ng h\u1ee3p l\u1ec7\";\n}\n\/\/ K\u1ebft qu\u1ea3: dayType = \"Cu\u1ed1i tu\u1ea7n\"<\/code><\/pre>\n\n\n\n<p><strong>Ch\u00fa \u00fd:<\/strong> N\u1ebfu b\u1ea1n v\u00f4 t\u00ecnh qu\u00ean t\u1eeb kh\u00f3a <code>break<\/code> trong m\u1ed9t <code>case<\/code> m\u00e0 kh\u00f4ng c\u00f3 \u00fd \u0111\u1ecbnh g\u1ed9p, \u0111\u00f3 l\u00e0 m\u1ed9t l\u1ed7i logic nghi\u00eam tr\u1ecdng v\u00ec ch\u01b0\u01a1ng tr\u00ecnh s\u1ebd th\u1ef1c thi c\u00e1c kh\u1ed1i l\u1ec7nh c\u1ee7a <code>case<\/code> ti\u1ebfp theo, d\u1eabn \u0111\u1ebfn k\u1ebft qu\u1ea3 sai l\u1ec7ch v\u00e0 r\u1ea5t kh\u00f3 \u0111\u1ec3 g\u1ee1 l\u1ed7i.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-quy-t\u1eafc-quan-tr\u1ecdng\"><strong>Quy t\u1eafc Quan tr\u1ecdng<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Gi\u00e1 tr\u1ecb case ph\u1ea3i l\u00e0 h\u1eb1ng s\u1ed1:<\/strong> Gi\u00e1 tr\u1ecb sau t\u1eeb kh\u00f3a <code>case<\/code> ph\u1ea3i l\u00e0 m\u1ed9t h\u1eb1ng s\u1ed1 \u0111\u00e3 bi\u1ebft t\u1ea1i th\u1eddi \u0111i\u1ec3m bi\u00ean d\u1ecbch (compile-time constant). N\u00f3 <strong>kh\u00f4ng th\u1ec3<\/strong> l\u00e0 m\u1ed9t bi\u1ebfn (variable) ho\u1eb7c m\u1ed9t bi\u1ec3u th\u1ee9c ph\u1ee9c t\u1ea1p.<\/li>\n\n\n\n<li><strong>Gi\u00e1 tr\u1ecb case kh\u00f4ng \u0111\u01b0\u1ee3c tr\u00f9ng l\u1eb7p:<\/strong> M\u1ed7i gi\u00e1 tr\u1ecb <code>case<\/code> trong c\u00f9ng m\u1ed9t kh\u1ed1i <code>switch<\/code> ph\u1ea3i l\u00e0 duy nh\u1ea5t.<\/li>\n\n\n\n<li><strong>Kh\u1ed1i default l\u00e0 t\u00f9y ch\u1ecdn:<\/strong> Kh\u00f4ng b\u1eaft bu\u1ed9c ph\u1ea3i c\u00f3 kh\u1ed1i <code>default<\/code>, nh\u01b0ng n\u00ean th\u00eam v\u00e0o \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c tr\u01b0\u1eddng h\u1ee3p kh\u00f4ng l\u01b0\u1eddng tr\u01b0\u1edbc \u0111\u01b0\u1ee3c.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-switch-expression-t\u1eeb-java-version-14\"><span class=\"ez-toc-section\" id=\"Switch_Expression_Tu_Java_version_14\"><\/span><strong>Switch Expression (T\u1eeb Java version 14)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 c\u1ed1 h\u1eefu c\u1ee7a <code>switch case<\/code> truy\u1ec1n th\u1ed1ng, Java \u0111\u00e3 gi\u1edbi thi\u1ec7u <strong>Switch Expression<\/strong> (Bi\u1ec3u th\u1ee9c Switch) b\u1eaft \u0111\u1ea7u t\u1eeb phi\u00ean b\u1ea3n Java 14, gi\u00fap m\u00e3 ngu\u1ed3n tr\u1edf n\u00ean g\u1ecdn g\u00e0ng, an to\u00e0n v\u00e0 c\u00f3 t\u00ednh bi\u1ec3u c\u1ea3m cao h\u01a1n.<\/p>\n\n\n\n<p>Switch truy\u1ec1n th\u1ed1ng c\u00f3 m\u1ed9t s\u1ed1 nh\u01b0\u1ee3c \u0111i\u1ec3m ch\u00ednh:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>D\u1ec5 b\u1ecb l\u1ed7i Fall-through:<\/strong> Vi\u1ec7c qu\u00ean t\u1eeb kh\u00f3a <code>break<\/code> l\u00e0 nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn g\u00e2y ra l\u1ed7i logic.<\/li>\n\n\n\n<li><strong>Kh\u00f4ng th\u1ec3 d\u00f9ng l\u00e0m bi\u1ec3u th\u1ee9c:<\/strong> <code>switch case<\/code> c\u0169 ch\u1ec9 l\u00e0 m\u1ed9t <strong>c\u00e2u l\u1ec7nh<\/strong> (statement), kh\u00f4ng th\u1ec3 tr\u1ef1c ti\u1ebfp tr\u1ea3 v\u1ec1 m\u1ed9t gi\u00e1 tr\u1ecb \u0111\u1ec3 g\u00e1n v\u00e0o bi\u1ebfn.<\/li>\n\n\n\n<li><strong>D\u00e0i d\u00f2ng:<\/strong> C\u00fa ph\u00e1p c\u0169 y\u00eau c\u1ea7u l\u1eb7p l\u1ea1i <code>break<\/code> cho h\u1ea7u h\u1ebft c\u00e1c <code>case<\/code>.<\/li>\n<\/ol>\n\n\n\n<p>Switch Expression gi\u1ea3i quy\u1ebft tri\u1ec7t \u0111\u1ec3 c\u00e1c v\u1ea5n \u0111\u1ec1 n\u00e0y b\u1eb1ng c\u00e1ch cho ph\u00e9p <code>switch<\/code> ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t bi\u1ec3u th\u1ee9c c\u00f3 th\u1ec3 t\u00ednh to\u00e1n v\u00e0 tr\u1ea3 v\u1ec1 m\u1ed9t gi\u00e1 tr\u1ecb.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-cu-phap-m\u1edbi-v\u1edbi-toan-t\u1eed-mui-ten-gt\"><strong>C\u00fa ph\u00e1p m\u1edbi v\u1edbi to\u00e1n t\u1eed M\u0169i t\u00ean (<\/strong><strong>-&gt;<\/strong><strong>)<\/strong><\/h3>\n\n\n\n<p>\u0110i\u1ec3m kh\u00e1c bi\u1ec7t l\u1edbn nh\u1ea5t l\u00e0 s\u1ef1 xu\u1ea5t hi\u1ec7n c\u1ee7a to\u00e1n t\u1eed m\u0169i t\u00ean <code>-><\/code> thay cho d\u1ea5u hai ch\u1ea5m <code>:<\/code><\/p>\n\n\n\n<p><strong>C\u00fa ph\u00e1p Truy\u1ec1n th\u1ed1ng: case gi\u00e1 tr\u1ecb:<\/strong><\/p>\n\n\n\n<p><strong>Switch Expression: case gi\u00e1_tr\u1ecb -&gt;<\/strong><\/p>\n\n\n\n<p><strong>L\u1ee3i \u00edch c\u1ee7a c\u00fa ph\u00e1p -><\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>T\u1ef1 \u0111\u1ed9ng lo\u1ea1i b\u1ecf Fall-through: V\u1edbi c\u00fa ph\u00e1p m\u0169i t\u00ean, ch\u1ec9 c\u00f3 kh\u1ed1i l\u1ec7nh sau <code>-><\/code> \u0111\u01b0\u1ee3c th\u1ef1c thi. B\u1ea1n kh\u00f4ng c\u1ea7n d\u00f9ng t\u1eeb kh\u00f3a break n\u1eefa v\u00ec h\u1ec7 th\u1ed1ng t\u1ef1 \u0111\u1ed9ng tho\u00e1t kh\u1ecfi switch sau khi th\u1ef1c thi kh\u1ed1i l\u1ec7nh.<\/li>\n\n\n\n<li>Tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb \u0111\u01a1n gi\u1ea3n: N\u1ebfu kh\u1ed1i l\u1ec7nh ch\u1ec9 c\u00f3 m\u1ed9t d\u00f2ng, d\u00f2ng \u0111\u00f3 t\u1ef1 \u0111\u1ed9ng \u0111\u01b0\u1ee3c coi l\u00e0 gi\u00e1 tr\u1ecb tr\u1ea3 v\u1ec1 c\u1ee7a to\u00e0n b\u1ed9 bi\u1ec3u th\u1ee9c switch.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-switch-expression\"><strong>Switch Expression<\/strong><\/h3>\n\n\n\n<p>B\u1ea1n c\u00f3 th\u1ec3 g\u00e1n tr\u1ef1c ti\u1ebfp k\u1ebft qu\u1ea3 c\u1ee7a Switch Expression v\u00e0o m\u1ed9t bi\u1ebfn, gi\u00fap lo\u1ea1i b\u1ecf vi\u1ec7c ph\u1ea3i khai b\u00e1o bi\u1ebfn tr\u01b0\u1edbc v\u00e0 g\u00e1n gi\u00e1 tr\u1ecb trong t\u1eebng <code>case<\/code>.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ V\u00ed d\u1ee5: G\u00e1n tr\u1ef1c ti\u1ebfp k\u1ebft qu\u1ea3 v\u00e0o bi\u1ebfn\nint day = 3;\nString dayType = switch (day) {\n    case 6, 7 -&gt; \"Cu\u1ed1i tu\u1ea7n\";      \/\/ T\u1ef1 \u0111\u1ed9ng tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb n\u00e0y\n    case 1, 2, 3, 4, 5 -&gt; \"Ng\u00e0y l\u00e0m vi\u1ec7c\";\n    default -&gt; \"Kh\u00f4ng h\u1ee3p l\u1ec7\";\n};\n\/\/ K\u1ebft qu\u1ea3: dayType = \"Ng\u00e0y l\u00e0m vi\u1ec7c\"<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-s\u1eed-d\u1ee5ng-t\u1eeb-khoa-yield\"><strong>S\u1eed d\u1ee5ng t\u1eeb kh\u00f3a <\/strong><strong>yield<\/strong><\/h3>\n\n\n\n<p>N\u1ebfu m\u1ed9t <code>case<\/code> c\u1ea7n th\u1ef1c hi\u1ec7n nhi\u1ec1u h\u01a1n m\u1ed9t c\u00e2u l\u1ec7nh (v\u00ed d\u1ee5: in ra th\u00f4ng b\u00e1o <em>v\u00e0<\/em> tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb), b\u1ea1n s\u1ebd s\u1eed d\u1ee5ng kh\u1ed1i l\u1ec7nh (d\u00f9ng <code>{}<\/code>) v\u00e0 t\u1eeb kh\u00f3a <code>yield<\/code> \u0111\u1ec3 ch\u1ec9 \u0111\u1ecbnh gi\u00e1 tr\u1ecb tr\u1ea3 v\u1ec1. <code>yield<\/code> \u0111\u00f3ng vai tr\u00f2 t\u01b0\u01a1ng t\u1ef1 nh\u01b0 <code>return<\/code> trong m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c, nh\u01b0ng ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng b\u00ean trong Switch Expression.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int score = 95;\nString grade = switch (score \/ 10) {\n    case 10, 9 -&gt; {\n        System.out.println(\"Ch\u00fac m\u1eebng!\"); \/\/ C\u00e2u l\u1ec7nh 1\n        yield \"A\";                      \/\/ Tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb\n    }\n    case 8 -&gt; \"B\";\n    default -&gt; \"C\";\n};\n\/\/ K\u1ebft qu\u1ea3: In ra \"Ch\u00fac m\u1eebng!\" v\u00e0 grade = \"A\"<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-so-sanh-switch-case-truy\u1ec1n-th\u1ed1ng-vs-switch-expression\"><strong>So s\u00e1nh Switch case Truy\u1ec1n th\u1ed1ng vs. Switch Expression<\/strong><\/h3>\n\n\n\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u1ea3ng t\u1ed5ng h\u1ee3p c\u00e1c \u0111i\u1ec3m kh\u00e1c bi\u1ec7t c\u1ed1t l\u00f5i, gi\u00fap b\u1ea1n quy\u1ebft \u0111\u1ecbnh khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng Switch Expression (Java 14+) \u0111\u1ec3 vi\u1ebft code an to\u00e0n v\u00e0 g\u1ecdn g\u00e0ng h\u01a1n:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Ti\u00eau ch\u00ed So s\u00e1nh<\/strong><\/td><td><strong>Switch case Truy\u1ec1n th\u1ed1ng<\/strong><\/td><td><strong>Switch expression (Java 14+)<\/strong><\/td><\/tr><tr><td><strong>B\u1ea3n ch\u1ea5t<\/strong><\/td><td><strong>C\u00e2u l\u1ec7nh<\/strong> (Statement)<\/td><td><strong>Bi\u1ec3u th\u1ee9c<\/strong> (Expression)<\/td><\/tr><tr><td><strong>M\u1ee5c \u0111\u00edch<\/strong><\/td><td>Th\u1ef1c thi h\u00e0nh \u0111\u1ed9ng<\/td><td><strong>Tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb<\/strong> tr\u1ef1c ti\u1ebfp<\/td><\/tr><tr><td><strong>C\u00fa ph\u00e1p ch\u00ednh<\/strong><\/td><td>D\u1ea5u hai ch\u1ea5m <strong>:<\/strong><\/td><td>To\u00e1n t\u1eed m\u0169i t\u00ean <strong><code>-&gt;<\/code><\/strong><\/td><\/tr><tr><td><strong>Ng\u0103n ch\u1eb7n Fall-through<\/strong><\/td><td><strong>B\u1eaeT BU\u1ed8C<\/strong> d\u00f9ng t\u1eeb kh\u00f3a <strong><code>break<\/code><\/strong><\/td><td><strong>T\u1ef1 \u0111\u1ed9ng<\/strong> lo\u1ea1i b\u1ecf (kh\u00f4ng c\u1ea7n <code>break<\/code>)<\/td><\/tr><tr><td><strong>Linh ho\u1ea1t<\/strong><\/td><td>D\u00e0i d\u00f2ng, d\u1ec5 l\u1ed7i logic<\/td><td><strong>Ng\u1eafn g\u1ecdn<\/strong>, an to\u00e0n h\u01a1n<\/td><\/tr><tr><td><strong>Tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb ph\u1ee9c t\u1ea1p<\/strong><\/td><td>Kh\u00f4ng<\/td><td>S\u1eed d\u1ee5ng t\u1eeb kh\u00f3a yield<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-m\u1eb9o-giup-code-s\u1ea1ch-h\u01a1n-khi-dung-c\u1ea5u-truc-switch\"><span class=\"ez-toc-section\" id=\"Meo_giup_code_sach_hon_khi_dung_cau_truc_switch\"><\/span><strong>M\u1eb9o gi\u00fap code s\u1ea1ch h\u01a1n khi d\u00f9ng c\u1ea5u tr\u00fac switch<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o m\u00e3 ngu\u1ed3n c\u1ee7a b\u1ea1n kh\u00f4ng ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng m\u00e0 c\u00f2n d\u1ec5 \u0111\u1ecdc, d\u1ec5 b\u1ea3o tr\u00ec v\u00e0 theo k\u1ecbp c\u00e1c ti\u00eau chu\u1ea9n hi\u1ec7n \u0111\u1ea1i c\u1ee7a Java, h\u00e3y \u00e1p d\u1ee5ng c\u00e1c m\u1eb9o sau khi l\u00e0m vi\u1ec7c v\u1edbi c\u1ea5u tr\u00fac <code>switch<\/code>:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-luon-\u01b0u-tien-switch-expression-java-14\"><strong>Lu\u00f4n \u01b0u ti\u00ean Switch Expression (Java 14+)<\/strong><\/h3>\n\n\n\n<p>N\u1ebfu d\u1ef1 \u00e1n c\u1ee7a b\u1ea1n \u0111ang s\u1eed d\u1ee5ng Java 14 tr\u1edf l\u00ean, h\u00e3y lu\u00f4n \u01b0u ti\u00ean s\u1eed d\u1ee5ng Switch Expression v\u1edbi to\u00e1n t\u1eed m\u0169i t\u00ean <code>-&gt;<\/code>.<\/p>\n\n\n\n<p>N\u00f3 lo\u1ea1i b\u1ecf nhu c\u1ea7u s\u1eed d\u1ee5ng <code>break<\/code>, lo\u1ea1i b\u1ecf nguy c\u01a1 l\u1ed7i Fall-through v\u00f4 \u00fd, v\u00e0 cho ph\u00e9p b\u1ea1n vi\u1ebft m\u00e3 theo phong c\u00e1ch bi\u1ec3u th\u1ee9c (tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb tr\u1ef1c ti\u1ebfp), gi\u00fap code ng\u1eafn g\u1ecdn h\u01a1n nhi\u1ec1u so v\u1edbi switch case truy\u1ec1n th\u1ed1ng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-s\u1eed-d\u1ee5ng-ki\u1ec3u-li\u1ec7t-ke-enum-v\u1edbi-switch\"><strong>S\u1eed d\u1ee5ng ki\u1ec3u li\u1ec7t k\u00ea (<\/strong><strong>Enum<\/strong><strong>) v\u1edbi <\/strong><strong>switch<\/strong><\/h3>\n\n\n\n<p>\u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng c\u00e1ch t\u1ed1t nh\u1ea5t \u0111\u1ec3 l\u00e0m s\u1ea1ch code v\u00e0 t\u0103ng t\u00ednh an to\u00e0n ki\u1ec3u d\u1eef li\u1ec7u (type safety).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>T\u00ednh d\u1ec5 \u0111\u1ecdc:<\/strong> Vi\u1ec7c so s\u00e1nh <code>case<\/code> v\u1edbi c\u00e1c t\u00ean <code>Enum<\/code> (v\u00ed d\u1ee5: <code>case MUA_XUAN:)<\/code> d\u1ec5 \u0111\u1ecdc h\u01a1n nhi\u1ec1u so v\u1edbi vi\u1ec7c so s\u00e1nh v\u1edbi c\u00e1c h\u1eb1ng s\u1ed1 s\u1ed1 h\u1ecdc (<code>case 1:<\/code>).<\/li>\n\n\n\n<li><strong>An to\u00e0n ki\u1ec3u d\u1eef li\u1ec7u:<\/strong> <code>Enum<\/code> \u0111\u1ea3m b\u1ea3o b\u1ea1n ch\u1ec9 \u0111ang x\u1eed l\u00fd c\u00e1c gi\u00e1 tr\u1ecb h\u1ee3p l\u1ec7 \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a.<\/li>\n\n\n\n<li><strong>Ki\u1ec3m so\u00e1t to\u00e0n di\u1ec7n:<\/strong> Tr\u00ecnh bi\u00ean d\u1ecbch Java c\u00f3 th\u1ec3 c\u1ea3nh b\u00e1o b\u1ea1n n\u1ebfu b\u1ea1n qu\u00ean x\u1eed l\u00fd m\u1ed9t <code>case<\/code> n\u00e0o \u0111\u00f3 trong Enum (khi s\u1eed d\u1ee5ng <code>switch expression<\/code>), gi\u00fap \u0111\u1ea3m b\u1ea3o b\u1ea1n lu\u00f4n bao qu\u00e1t m\u1ecdi tr\u01b0\u1eddng h\u1ee3p.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-tranh-cac-kh\u1ed1i-case-qua-dai-ho\u1eb7c-ph\u1ee9c-t\u1ea1p\"><strong>Tr\u00e1nh c\u00e1c kh\u1ed1i case qu\u00e1 d\u00e0i ho\u1eb7c ph\u1ee9c t\u1ea1p<\/strong><\/h3>\n\n\n\n<p>M\u1ee5c ti\u00eau c\u1ee7a <code>switch case<\/code> l\u00e0 \u0111i\u1ec1u khi\u1ec3n lu\u1ed3ng d\u1ef1a tr\u00ean c\u00e1c gi\u00e1 tr\u1ecb c\u1ed1 \u0111\u1ecbnh, kh\u00f4ng ph\u1ea3i \u0111\u1ec3 ch\u1ee9a logic ph\u1ee9c t\u1ea1p.<\/p>\n\n\n\n<p><strong>Nguy\u00ean t\u1eafc:<\/strong> N\u1ebfu kh\u1ed1i l\u1ec7nh b\u00ean trong m\u1ed9t <code>case<\/code> tr\u1edf n\u00ean qu\u00e1 d\u00e0i (v\u00ed d\u1ee5: nhi\u1ec1u h\u01a1n 5-7 d\u00f2ng code) ho\u1eb7c th\u1ef1c hi\u1ec7n nhi\u1ec1u t\u00e1c v\u1ee5 kh\u00e1c nhau, h\u00e3y tr\u00edch xu\u1ea5t (Extract) kh\u1ed1i logic \u0111\u00f3 th\u00e0nh m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c (method) ri\u00eang bi\u1ec7t.<\/p>\n\n\n\n<p><strong>V\u00ed d\u1ee5:<\/strong> Thay v\u00ec vi\u1ebft to\u00e0n b\u1ed9 logic x\u1eed l\u00fd \u0111\u01a1n h\u00e0ng trong <code>case DANG_CHO:<\/code>, b\u1ea1n ch\u1ec9 c\u1ea7n g\u1ecdi <code>case DANG_CHO -&gt; xuLyDonHangDangCho(donHang);<\/code>. \u0110i\u1ec1u n\u00e0y gi\u1eef cho c\u1ea5u tr\u00fac <code>switch<\/code> g\u1ecdn g\u00e0ng v\u00e0 t\u1eadp trung v\u00e0o vai tr\u00f2 \u0111i\u1ec1u ph\u1ed1i lu\u1ed3ng ch\u00ednh c\u1ee7a n\u00f3.<\/p>\n\n\n\n<p>B\u1eb1ng c\u00e1ch tu\u00e2n th\u1ee7 c\u00e1c m\u1eb9o n\u00e0y, b\u1ea1n s\u1ebd bi\u1ebfn c\u00e1c c\u1ea5u tr\u00fac \u0111i\u1ec1u ki\u1ec7n ph\u1ee9c t\u1ea1p th\u00e0nh c\u00e1c \u0111o\u1ea1n m\u00e3 r\u00f5 r\u00e0ng, d\u1ec5 b\u1ea3o tr\u00ec, th\u1ec3 hi\u1ec7n s\u1ef1 chuy\u00ean nghi\u1ec7p trong phong c\u00e1ch l\u1eadp tr\u00ecnh Java c\u1ee7a m\u00ecnh.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-cac-cau-h\u1ecfi-th\u01b0\u1eddng-g\u1eb7p-v\u1ec1-switch-case-java\"><span class=\"ez-toc-section\" id=\"Cac_cau_hoi_thuong_gap_ve_switch_case_Java\"><\/span><strong>C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 switch case Java<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-switch-case-co-th\u1ec3-s\u1eed-d\u1ee5ng-v\u1edbi-ki\u1ec3u-long-ho\u1eb7c-float-double-khong\"><strong>Switch case c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng v\u1edbi ki\u1ec3u long ho\u1eb7c float\/double kh\u00f4ng?<\/strong><\/h3>\n\n\n\n<p>Kh\u00f4ng. C\u00e2u l\u1ec7nh <code>switch<\/code> trong Java kh\u00f4ng h\u1ed7 tr\u1ee3 c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u <code>long<\/code>, <code>float<\/code>, ho\u1eb7c <code>double<\/code> (c\u0169ng nh\u01b0 boolean).<\/p>\n\n\n\n<p>L\u00fd do: C\u00e1c gi\u00e1 tr\u1ecb <code>case<\/code> c\u1ea7n ph\u1ea3i l\u00e0 h\u1eb1ng s\u1ed1 nguy\u00ean ho\u1eb7c c\u00e1c gi\u00e1 tr\u1ecb c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c so s\u00e1nh b\u1eb1ng nhau m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng v\u00e0 hi\u1ec7u qu\u1ea3 (nh\u01b0 <code>int<\/code>, <code>char<\/code>, <code>String<\/code>, <code>Enum<\/code>). Ki\u1ec3u float v\u00e0 double s\u1eed d\u1ee5ng bi\u1ec3u di\u1ec5n d\u1ea5u ph\u1ea9y \u0111\u1ed9ng, d\u1ec5 g\u00e2y ra sai s\u1ed1 ch\u00ednh x\u00e1c (precision issues) khi so s\u00e1nh b\u1eb1ng <code>==,<\/code> khi\u1ebfn ch\u00fang kh\u00f4ng ph\u00f9 h\u1ee3p cho vi\u1ec7c so s\u00e1nh c\u1ed1 \u0111\u1ecbnh c\u1ee7a <code>switch<\/code><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><em>\u0110\u1ecdc chi ti\u1ebft: <strong><a href=\"https:\/\/itviec.com\/blog\/cac-kieu-du-lieu-trong-java\/\" target=\"_blank\" rel=\"noreferrer noopener\">C\u00e1c ki\u1ec3u d\u1eef li\u1ec7u trong Java A-Z: \u0110\u1ecbnh ngh\u0129a v\u00e0 C\u00e1ch s\u1eed d\u1ee5ng<\/a><\/strong><\/em><\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-di\u1ec1u-gi-x\u1ea3y-ra-n\u1ebfu-quen-kh\u1ed1i-default\"><strong>\u0110i\u1ec1u g\u00ec x\u1ea3y ra n\u1ebfu qu\u00ean kh\u1ed1i default?<\/strong><\/h3>\n\n\n\n<p>N\u1ebfu b\u1ea1n kh\u00f4ng c\u00f3 kh\u1ed1i default v\u00e0 kh\u00f4ng c\u00f3 case n\u00e0o kh\u1edbp v\u1edbi gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c switch:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Trong switch case truy\u1ec1n th\u1ed1ng:<\/strong> Ch\u01b0\u01a1ng tr\u00ecnh s\u1ebd b\u1ecf qua to\u00e0n b\u1ed9 kh\u1ed1i switch v\u00e0 ti\u1ebfp t\u1ee5c th\u1ef1c thi c\u00e1c c\u00e2u l\u1ec7nh ngay sau n\u00f3. Kh\u00f4ng c\u00f3 l\u1ed7i ph\u00e1t sinh.<\/li>\n\n\n\n<li><strong>Trong switch expression (Java 14+):<\/strong> N\u1ebfu b\u1ea1n kh\u00f4ng bao qu\u00e1t t\u1ea5t c\u1ea3 c\u00e1c tr\u01b0\u1eddng h\u1ee3p c\u00f3 th\u1ec3 x\u1ea3y ra (v\u00ed d\u1ee5: x\u1eed l\u00fd t\u1ea5t c\u1ea3 c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a m\u1ed9t Enum ho\u1eb7c t\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 nguy\u00ean c\u00f3 th\u1ec3 c\u00f3), b\u1ea1n ph\u1ea3i cung c\u1ea5p kh\u1ed1i default. N\u1ebfu kh\u00f4ng, tr\u00ecnh bi\u00ean d\u1ecbch s\u1ebd b\u00e1o l\u1ed7i v\u00ec switch expression ph\u1ea3i \u0111\u1ea3m b\u1ea3o tr\u1ea3 v\u1ec1 m\u1ed9t gi\u00e1 tr\u1ecb trong m\u1ecdi t\u00ecnh hu\u1ed1ng.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-co-th\u1ec3-g\u1ed9p-nhi\u1ec1u-case-trong-switch-expression-gt-khong\"><strong>C\u00f3 th\u1ec3 g\u1ed9p nhi\u1ec1u case trong Switch Expression (-&gt;) kh\u00f4ng?<\/strong><\/h3>\n\n\n\n<p>C\u00f3 v\u00e0 n\u00f3 r\u1ea5t d\u1ec5 d\u00e0ng. Kh\u00e1c v\u1edbi vi\u1ec7c ph\u1ea3i s\u1eed d\u1ee5ng Fall-through v\u00e0 b\u1ecf <code>break<\/code> trong c\u1ea5u tr\u00fac truy\u1ec1n th\u1ed1ng, Switch Expression cho ph\u00e9p b\u1ea1n li\u1ec7t k\u00ea nhi\u1ec1u gi\u00e1 tr\u1ecb c\u00e1ch nhau b\u1eb1ng d\u1ea5u ph\u1ea9y.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ C\u00fa ph\u00e1p g\u1ecdn g\u00e0ng v\u00e0 an to\u00e0n\ncase 1, 3, 5 -&gt; \"Ng\u00e0y l\u1ebb\";\ncase 2, 4, 6 -&gt; \"Ng\u00e0y ch\u1eb5n\";<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-khi-nao-thi-nen-dung-switch-thay-vi-if-else\"><strong>Khi n\u00e0o th\u00ec n\u00ean d\u00f9ng <\/strong><strong>switch<\/strong><strong> thay v\u00ec <\/strong><strong>if-else<\/strong><strong>?<\/strong><\/h3>\n\n\n\n<p>B\u1ea1n n\u00ean d\u00f9ng <code>switch<\/code> khi b\u1ea1n \u0111ang so s\u00e1nh <strong>m\u1ed9t bi\u1ebfn duy nh\u1ea5t<\/strong> v\u1edbi <strong>m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c gi\u00e1 tr\u1ecb c\u1ed1 \u0111\u1ecbnh<\/strong> (nh\u01b0 m\u00e3 tr\u1ea1ng th\u00e1i, k\u00fd t\u1ef1, ho\u1eb7c gi\u00e1 tr\u1ecb <code>Enum<\/code>).<\/p>\n\n\n\n<p>B\u1ea1n n\u00ean d\u00f9ng if-else khi:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>C\u1ea7n so s\u00e1nh <strong>ph\u1ea1m vi<\/strong> (<code>>=,<\/code> <code>&lt;=).<\/code><\/li>\n\n\n\n<li>C\u1ea7n k\u1ebft h\u1ee3p <strong>nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n<\/strong> (<code>&amp;&amp;<\/code>,<code>||<\/code>).<\/li>\n\n\n\n<li>C\u1ea7n so s\u00e1nh c\u00e1c <strong>\u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ee9c t\u1ea1p<\/strong> (kh\u00f4ng ph\u1ea3i <code>String<\/code> ho\u1eb7c <code>Enum<\/code>).<\/li>\n<\/ol>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><em>\u0110\u1ecdc chi ti\u1ebft: <strong><a href=\"https:\/\/itviec.com\/blog\/bien-trong-java\/\" target=\"_blank\" rel=\"noreferrer noopener\">Bi\u1ebfn trong Java: Chi ti\u1ebft h\u01b0\u1edbng d\u1eabn s\u1eed d\u1ee5ng \u0111\u00fang c\u00e1ch<\/a><\/strong><\/em><\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-t\u1ed5ng-k\u1ebft\"><span class=\"ez-toc-section\" id=\"Tong_ket\"><\/span><strong>T\u1ed5ng k\u1ebft<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Qua b\u00e0i vi\u1ebft n\u00e0y, b\u1ea1n \u0111\u00e3 trang b\u1ecb ki\u1ebfn th\u1ee9c to\u00e0n di\u1ec7n v\u1ec1 <code>switch<\/code> trong Java. Ch\u00fang ta \u0111\u00e3 \u0111i t\u1eeb vi\u1ec7c hi\u1ec3u vai tr\u00f2 c\u1ee7a <code>switch case<\/code> truy\u1ec1n th\u1ed1ng (gi\u1ea3i ph\u00e1p thay th\u1ebf cho <code>if-else<\/code> ph\u1ee9c t\u1ea1p) \u0111\u1ebfn vi\u1ec7c n\u1eafm b\u1eaft s\u1ee9c m\u1ea1nh c\u1ee7a Switch Expression hi\u1ec7n \u0111\u1ea1i.<\/p>\n\n\n\n<p>\u0110\u00e3 \u0111\u1ebfn l\u00fac b\u1ea1n n\u00ean thay \u0111\u1ed5i th\u00f3i quen l\u1eadp tr\u00ecnh! Vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i sang s\u1eed d\u1ee5ng Switch Expression kh\u00f4ng ch\u1ec9 gi\u00fap m\u00e3 ngu\u1ed3n c\u1ee7a b\u1ea1n tr\u1edf n\u00ean hi\u1ec7n \u0111\u1ea1i m\u00e0 c\u00f2n lo\u1ea1i b\u1ecf m\u1ed9t ngu\u1ed3n l\u1ed7i ph\u1ed5 bi\u1ebfn trong l\u1eadp tr\u00ecnh Java.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trong l\u1eadp tr\u00ecnh Java, c\u00e1c c\u1ea5u tr\u00fac \u0111i\u1ec1u khi\u1ec3n l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t quy\u1ebft \u0111\u1ecbnh lu\u1ed3ng ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ch\u01b0\u01a1ng tr\u00ecnh. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o m\u1ed9t trong nh\u1eefng c\u1ea5u tr\u00fac m\u1ea1nh m\u1ebd nh\u1ea5t \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c quy\u1ebft \u0111\u1ecbnh d\u1ef1a tr\u00ean nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n: c\u00e2u l\u1ec7nh switch. Ch\u00fang ta s\u1ebd c\u00f9ng [&hellip;]<\/p>\n","protected":false},"author":203,"featured_media":93326,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_gspb_post_css":"","footnotes":""},"categories":[109,10350],"tags":[],"class_list":["post-93298","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chuyen-mon-it","category-java"],"blocksy_meta":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.8 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Switch case Java: L\u00e0m ch\u1ee7 Switch Expression trong Java - ITviec Blog<\/title>\n<meta name=\"description\" content=\"Chi ti\u1ebft c\u00e1ch \u00e1p d\u1ee5ng switch case Java truy\u1ec1n th\u1ed1ng, t\u00ecm hi\u1ec3u c\u00e1ch kh\u1eafc ph\u1ee5c s\u1ef1 ph\u1ee9c t\u1ea1p v\u00e0 kh\u00f3 qu\u1ea3n l\u00fd c\u1ee7a chu\u1ed7i if-else if-else k\u00e9o d\u00e0i.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/itviec.com\/blog\/huong-dan-switch-case-java\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Switch case Java: L\u00e0m ch\u1ee7 Switch Expression trong Java\" \/>\n<meta property=\"og:description\" content=\"Trong l\u1eadp tr\u00ecnh Java, c\u00e1c c\u1ea5u tr\u00fac \u0111i\u1ec1u khi\u1ec3n l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t quy\u1ebft \u0111\u1ecbnh lu\u1ed3ng ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ch\u01b0\u01a1ng tr\u00ecnh. 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