{"id":1022,"date":"2020-07-27T13:36:06","date_gmt":"2020-07-27T16:36:06","guid":{"rendered":"https:\/\/micheladrianomedeiros.com.br\/blog\/?p=1022"},"modified":"2020-07-27T13:36:08","modified_gmt":"2020-07-27T16:36:08","slug":"aprendendo-java-para-certificacao-18","status":"publish","type":"post","link":"https:\/\/micheladrianomedeiros.com.br\/blog\/aprendendo-java-para-certificacao-18\/","title":{"rendered":"Aprendendo Java Para Certifica\u00e7\u00e3o #18"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 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\">Table of Contents<\/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-4'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/micheladrianomedeiros.com.br\/blog\/aprendendo-java-para-certificacao-18\/#Tipos_de_Dados_Suportados\" >Tipos de Dados Suportados<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/micheladrianomedeiros.com.br\/blog\/aprendendo-java-para-certificacao-18\/#Valores_Constantes_em_Tempo_de_Compilacao\" >Valores Constantes em Tempo de Compila\u00e7\u00e3o<\/a><\/li><\/ul><\/nav><\/div>\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tipos_de_Dados_Suportados\"><\/span><strong>Tipos de Dados Suportados<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>A express\u00e3o switch tem uma vari\u00e1vel alvo que n\u00e3o est\u00e1 habilitada at\u00e9 o programa esteja em tempo de execu\u00e7\u00e3o. Antes do Java 5, essa vari\u00e1vel poderia apenas ser um valor int ou aqueles valores que poderiam ser promovidos para int, especificamente byte, short, char ou int.<\/p>\n\n\n\n<p>Quando enum foi adicionado no Java 5, foi adicionado ao switch o suporte para valores enum. No Java 7, a declara\u00e7\u00e3o switch foi al\u00e9m e permitiu os valores String. Finalmente, a declara\u00e7\u00e3o switch tamb\u00e9m suporta qualquer classe num\u00e9rica empacotada, tais como Byte, Short, Character ou Integer.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"566\" height=\"305\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/07\/image-8.png\" alt=\"\" class=\"wp-image-1023\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/07\/image-8.png 566w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/07\/image-8-300x162.png 300w\" sizes=\"auto, (max-width: 566px) 100vw, 566px\" \/><\/figure><\/div>\n\n\n\n<p>Os tipos de dados suportados s\u00e3o:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>byte e Byte<\/li><li>short e Short<\/li><li>char e Character<\/li><li>int e Integer<\/li><li>String<\/li><li>Valores enum<\/li><\/ul>\n\n\n\n<p>Veja que o boolean e long tem tipos empacotados, mas n\u00e3o s\u00e3o suportados pela declara\u00e7\u00e3o switch.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Valores_Constantes_em_Tempo_de_Compilacao\"><\/span><strong>Valores Constantes em Tempo de Compila\u00e7\u00e3o<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Os valores para cada declara\u00e7\u00e3o case precisa ser uma constante em tempo de compila\u00e7\u00e3o de mesmo tipo de dado que o valor do switch. Isso significa que voc\u00ea pode apenas utilizar literals, constantes enum ou constantes final do mesmo tipo de dado.<\/p>\n\n\n\n<p>A constante final, significa que a vari\u00e1vel precisa ser marcada com o modificador final e inicializada com um valor literal dentro da mesma express\u00e3o na qual foi declarada.<\/p>\n\n\n\n<p>Vamos ver um exemplo utilizando o dia da semana, onde 0 \u00e9 Domingo, 1 \u00e9 Segunda, e assim por diante:<\/p>\n\n\n\n<div class=\"wp-block-urvanov-syntax-highlighter-code-block\"><pre class=\"lang:java decode:true \" >int diasDaSemana = 5;\nswitch(diasDaSemana) {\n    default:\n        System.out.println(\u201cDias da Semana\u201d);\n    break;\ncase 0:\n    System.out.println(\u201cDomingo\u201d);\nbreak;\ncase 6:\n    System.out.println(\u201cS\u00e1bado\u201d);\nbreak;\n}\n<\/pre><\/div>\n\n\n\n<p>Com o valor 5 a sa\u00edda do programa ser\u00e1:<\/p>\n\n\n\n<p>Dias da Semana.<\/p>\n\n\n\n<p>A primeira coisa que notamos \u00e9 que h\u00e1 uma declara\u00e7\u00e3o break no fim de cada case e uma se\u00e7\u00e3o default. N\u00f3s iremos ver a declara\u00e7\u00e3o break em detalhes quando chegarmos no assunto dos loops, mas por enquanto sabia que ele encerra a declara\u00e7\u00e3o switch e retorna o valor correspondente do escopo que o break se encontra. Se o break n\u00e3o for utilizado a execu\u00e7\u00e3o do switch ir\u00e1 executar at\u00e9 o bloco default.<\/p>\n\n\n\n<p>Outra coisa para prestar aten\u00e7\u00e3o \u00e9 que o bloco default n\u00e3o est\u00e1 no fim do escopo do switch. O default n\u00e3o tem um lugar espec\u00edfico para ficar. Veja o exemplo a seguir:<\/p>\n\n\n\n<div class=\"wp-block-urvanov-syntax-highlighter-code-block\"><pre class=\"lang:java decode:true \" >int diasDaSemana = 5;\nswitch(diasDaSemana) {\n    case 0:\n        System.out.println(\u201cDomingo\u201d);\n    default:\n       System.out.println(\u201cDias de Semana\u201d);\ncase 6:\n    System.out.println(\u201cS\u00e1bado\u201d);\nbreak;\n}\n<\/pre><\/div>\n\n\n\n<p>Esse c\u00f3digo parece com o anterior a esse, exceto por duas declara\u00e7\u00f5es break que foram removidas e a ordem foi modificada. Isso significa que o valor dado ao DiasDaSemana, 5, poder\u00e1 pular para o bloco default e executar\u00e1 at\u00e9 encontrar a declara\u00e7\u00e3o break ou terminar a estrutura:<\/p>\n\n\n\n<p>A sa\u00edda ser\u00e1:<\/p>\n\n\n\n<p>Dias da Semana<\/p>\n\n\n\n<p>S\u00e1bado<\/p>\n\n\n\n<p>A ordem da declara\u00e7\u00e3o case e default \u00e9 importante desde que o default termine a switch com apenas uma sa\u00edda. Se o valor do diasDaSemana for 6, o bloco default ser\u00e1 executado? A sa\u00edda ser\u00e1 a seguinte:<\/p>\n\n\n\n<p>S\u00e1bado<\/p>\n\n\n\n<p>Mesmo que o bloco default esteja antes do bloco case, apenas o bloco case foi executado. Lembrando da defini\u00e7\u00e3o do bloco default: s\u00f3 ser\u00e1 executado o default se nenhum valor verificado for igual a nenhum case, n\u00e3o importando a posi\u00e7\u00e3o.<\/p>\n\n\n\n<p>Se o valor da vari\u00e1vel diasDaSemana for 0, todas as tr\u00eas declara\u00e7\u00f5es ser\u00e3o executadas:<\/p>\n\n\n\n<p>Domingo<\/p>\n\n\n\n<p>Dias da Semana<\/p>\n\n\n\n<p>S\u00e1bado<\/p>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"http:\/\/tpcg.io\/k8OkS1c2\" target=\"_blank\">Acesse o link para ver mais um exemplo.<\/a><\/p>\n\n\n\n<p>Fonte: OCA \u2013 Oracle Certified Associate Java SE 8 Programmer I \u2013 Study Guide<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tipos de Dados Suportados A express\u00e3o switch tem uma vari\u00e1vel alvo que n\u00e3o est\u00e1 habilitada at\u00e9 o programa esteja em tempo de execu\u00e7\u00e3o. Antes do Java 5, essa vari\u00e1vel poderia apenas ser um valor int ou aqueles valores que poderiam ser promovidos para int, especificamente byte, short, char ou int. Quando enum foi adicionado no [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":144,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38,1],"tags":[],"class_list":["post-1022","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-certificacao","category-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.5 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Aprendendo Java Para Certifica\u00e7\u00e3o #18 - Viciados em Aprender<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/micheladrianomedeiros.com.br\/blog\/aprendendo-java-para-certificacao-18\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aprendendo Java Para Certifica\u00e7\u00e3o #18\" \/>\n<meta property=\"og:description\" content=\"Tipos de Dados Suportados A express\u00e3o switch tem uma vari\u00e1vel alvo que n\u00e3o est\u00e1 habilitada at\u00e9 o programa esteja em tempo de execu\u00e7\u00e3o. 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