{"id":994,"date":"2020-07-13T12:57:54","date_gmt":"2020-07-13T15:57:54","guid":{"rendered":"https:\/\/micheladrianomedeiros.com.br\/blog\/?p=994"},"modified":"2020-07-13T12:57:57","modified_gmt":"2020-07-13T15:57:57","slug":"aprendendo-java-para-certificacao-16","status":"publish","type":"post","link":"https:\/\/micheladrianomedeiros.com.br\/blog\/aprendendo-java-para-certificacao-16\/","title":{"rendered":"Aprendendo Java Para Certifica\u00e7\u00e3o #16"},"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-16\/#A_Declaracao_if\" >A Declara\u00e7\u00e3o if<\/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-16\/#Cuidado_com_a_Indentacao_e_Chaves\" >Cuidado com a Indenta\u00e7\u00e3o e Chaves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/micheladrianomedeiros.com.br\/blog\/aprendendo-java-para-certificacao-16\/#A_Declaracao_if-_if_else-else\" >A Declara\u00e7\u00e3o if- if else-else<\/a><\/li><\/ul><\/nav><\/div>\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"A_Declaracao_if\"><\/span><strong>A Declara\u00e7\u00e3o if<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Muitas vezes queremos executar um bloco de c\u00f3digo sobre certas circunst\u00e2ncias. Ent\u00e3o a declara\u00e7\u00e3o if permite que nossa aplica\u00e7\u00e3o execute um bloco particular de c\u00f3digo e retorna um boolean em tempo de execu\u00e7\u00e3o.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"567\" height=\"169\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/07\/image-3.png\" alt=\"\" class=\"wp-image-996\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/07\/image-3.png 567w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/07\/image-3-300x89.png 300w\" sizes=\"auto, (max-width: 567px) 100vw, 567px\" \/><\/figure><\/div>\n\n\n\n<p>Por exemplo, imagine que n\u00f3s temos uma fun\u00e7\u00e3o que utiliza a hora do dia, um inteiro com o valor entre 0 e 23 para mostrar uma mensagem para o usu\u00e1rio:<\/p>\n\n\n\n<div class=\"wp-block-urvanov-syntax-highlighter-code-block\"><pre class=\"lang:java decode:true \" >If(horaDoDia &lt; 12)\n    System.out.println(\u201cBom dia\u201d);\n<\/pre><\/div>\n\n\n\n<p>Se a hora do dia \u00e9 menor que 12, ent\u00e3o a mensagem ser\u00e1 mostrada. Digamos que tamb\u00e9m queremos incrementar um valor no manhaContadorCumprimento toda vez que o agradecimento \u00e9 mostrado.<\/p>\n\n\n\n<p>N\u00f3s podemos escrever a declara\u00e7\u00e3o if duas vezes, mas podemos escrever mais de uma linha no bloco if.<\/p>\n\n\n\n<div class=\"wp-block-urvanov-syntax-highlighter-code-block\"><pre class=\"lang:java decode:true \" >If(horaDoDia &lt; 12){\n    System.out.println(\u201cBom dia\u201d);\n\tmanhaContadorCumprimento ++;\n}\n<\/pre><\/div>\n\n\n\n<p>O bloco permite m\u00faltiplas declara\u00e7\u00f5es para ser executado baseado na avalia\u00e7\u00e3o do if. Note que a primeira declara\u00e7\u00e3o n\u00e3o cont\u00e9m um bloco, mas poderia ter.<\/p>\n\n\n\n<p>Para legibilidade, \u00e9 considerado uma boa pr\u00e1tica colocar o bloco (as chaves) na declara\u00e7\u00e3o if, como em outros que tamb\u00e9m n\u00e3o s\u00e3o necess\u00e1rias.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cuidado_com_a_Indentacao_e_Chaves\"><\/span><strong>Cuidado com a Indenta\u00e7\u00e3o e Chaves<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<div class=\"wp-block-urvanov-syntax-highlighter-code-block\"><pre class=\"lang:java decode:true \" >If(horaDoDia &lt; 12)\n    System.out.println(\u201cBom dia\u201d);\n    manhaContadorCumprimento++;\n<\/pre><\/div>\n\n\n\n<p>Baseado na indenta\u00e7\u00e3o, voc\u00ea pode achar que a vari\u00e1vel manhaContadorCumprimento ser\u00e1 apenas incrementada se a horaDoDia for menor que 12, mas isso n\u00e3o \u00e9 o que o c\u00f3digo faz. Ir\u00e1 mostrar a mensagem \u201cBom dia\u201d somente se a condi\u00e7\u00e3o for verdadeira, mas o incremento sempre ser\u00e1 executado. <\/p>\n\n\n\n<p>Lembre-se que o Java, diferente de outras linguagens, pressionar a tecla tab produz apenas espa\u00e7os em branco e n\u00e3o s\u00e3o considerados na execu\u00e7\u00e3o. Ent\u00e3o sempre ignores as indenta\u00e7\u00f5es e preste aten\u00e7\u00e3o nos blocos de chaves.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"A_Declaracao_if-_if_else-else\"><\/span><strong>A Declara\u00e7\u00e3o if- if else-else<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Se voc\u00ea quiser mostrar uma mensagem diferente da condi\u00e7\u00e3o horaDoDia &lt; 12, podemos fazer assim:<\/p>\n\n\n\n<div class=\"wp-block-urvanov-syntax-highlighter-code-block\"><pre class=\"lang:java decode:true \" >If(horaDoDia &lt; 12){\n    System.out.println(\u201cBom dia\u201d);\n}\nIf(horaDoDia &gt;= 12){\n    System.out.println(\u201cBoa tarde\u201d);\n}\n<\/pre><\/div>\n\n\n\n<p>Isso parece redundante, j\u00e1 que escrevemos a vari\u00e1vel horaDoDia duas vezes. Isso pode ser um desperd\u00edcio de computa\u00e7\u00e3o, porque express\u00f5es booleans podem ser custosas. Mas o Java oferece uma alternativa para isso:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"567\" height=\"219\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/07\/image-5.png\" alt=\"\" class=\"wp-image-998\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/07\/image-5.png 567w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/07\/image-5-300x116.png 300w\" sizes=\"auto, (max-width: 567px) 100vw, 567px\" \/><\/figure><\/div>\n\n\n\n<p>Vamos voltar ao exemplo:<\/p>\n\n\n\n<div class=\"wp-block-urvanov-syntax-highlighter-code-block\"><pre class=\"lang:java decode:true \" >If(horaDoDia &lt; 12){\n    System.out.println(\u201cBom dia\u201d);\n} else {\n    System.out.println(\u201cBoa tarde\u201d);\n}\n<\/pre><\/div>\n\n\n\n<p>O c\u00f3digo tem duas op\u00e7\u00f5es, com a avalia\u00e7\u00e3o booleana apenas uma vez. \u00c9 assim que o operador else ajuda para que a declara\u00e7\u00e3o somente execute uma vez a verifica\u00e7\u00e3o booleana.<\/p>\n\n\n\n<p>Pegando esse exemplo podemos incrementar mais verifica\u00e7\u00f5es e refinar ainda mais as condi\u00e7\u00f5es de execu\u00e7\u00e3o:<\/p>\n\n\n\n<div class=\"wp-block-urvanov-syntax-highlighter-code-block\"><pre class=\"lang:java decode:true \" >If(horaDoDia &lt; 12){\n    System.out.println(\u201cBom dia\u201d);\n} else if(horaDoDia &lt;18) {\n    System.out.println(\u201cBoa tarde\u201d);\n} else {\n    System.out.println(\u201cBoa noite\u201d);\n}\n<\/pre><\/div>\n\n\n\n<p>Nesse exemplo, o Java continuar\u00e1 a processar at\u00e9 encontrar uma declara\u00e7\u00e3o if que tem a avalia\u00e7\u00e3o true. Se nenhuma das duas express\u00f5es forem true, a execu\u00e7\u00e3o continuar\u00e1 at\u00e9 o bloco else.<\/p>\n\n\n\n<p>Cuidado ao criar blocos if porque podem acontecer de alguns blocos nunca serem executados:<\/p>\n\n\n\n<div class=\"wp-block-urvanov-syntax-highlighter-code-block\"><pre class=\"lang:java decode:true \" >If(horaDoDia &lt; 18) {\n    System.out.println(\u201cBoa tarde\u201d);\n} else if (horaDoDia &lt; 12) {\n    System.out.println(\u201cBom dia\u201d); \/\/nunca executado\n} else {\n    System.out.println(\u201cBoa noite\u201d);\n}\n<\/pre><\/div>\n\n\n\n<p>Se o hor\u00e1rio for menor que 12, o comportamento ser\u00e1 diferente do c\u00f3digo anterior. Veja se voc\u00ea consegue entender o porqu\u00ea do c\u00f3digo marcado como \u201cnunca executado\u201d, nunca ser\u00e1 executado.<\/p>\n\n\n\n<p>Veja que \u00e9 muito simples o motivo, qualquer hor\u00e1rio menor que 18 ser\u00e1 executado no primeiro bloco, e o segundo bloco que \u00e9 menor que 12 nunca ser\u00e1 executado porque 12 \u00e9 menor que 18.<\/p>\n\n\n\n<p>Preste aten\u00e7\u00e3o nesses c\u00f3digos:<\/p>\n\n\n\n<div class=\"wp-block-urvanov-syntax-highlighter-code-block\"><pre class=\"lang:java decode:true \" >int x = 1;\nif(x) { \/\/n\u00e3o compila\n    .... \n}\n<\/pre><\/div>\n\n\n\n<p>Esse c\u00f3digo n\u00e3o compila porque o Java diferente de outras linguagens de programa\u00e7\u00e3o n\u00e3o considera o valor 1 como verdadeiro (true) e 0 como falso (false).<\/p>\n\n\n\n<div class=\"wp-block-urvanov-syntax-highlighter-code-block\"><pre class=\"lang:java decode:true \" >int x = 1;\nif(x = 5) { \/\/n\u00e3o compila\n    ...\n}\n<\/pre><\/div>\n\n\n\n<p>Preste aten\u00e7\u00e3o que a verifica\u00e7\u00e3o deve ser feito com dois sinais de igualdade (==) e n\u00e3o um (=) como est\u00e1 no exemplo, por essa raz\u00e3o que o programa n\u00e3o compila.<\/p>\n\n\n\n<p>Fonte: OCA &#8211; Oracle Certified Associate Java SE 8 Programmer I &#8211; Study Guide<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A Declara\u00e7\u00e3o if Muitas vezes queremos executar um bloco de c\u00f3digo sobre certas circunst\u00e2ncias. Ent\u00e3o a declara\u00e7\u00e3o if permite que nossa aplica\u00e7\u00e3o execute um bloco particular de c\u00f3digo e retorna um boolean em tempo de execu\u00e7\u00e3o. Por exemplo, imagine que n\u00f3s temos uma fun\u00e7\u00e3o que utiliza a hora do dia, um inteiro com o valor [&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-994","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 #16 - 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-16\/\" \/>\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 #16\" \/>\n<meta property=\"og:description\" content=\"A Declara\u00e7\u00e3o if Muitas vezes queremos executar um bloco de c\u00f3digo sobre certas circunst\u00e2ncias. 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