{"id":726,"date":"2020-03-02T10:43:36","date_gmt":"2020-03-02T13:43:36","guid":{"rendered":"https:\/\/micheladrianomedeiros.com.br\/blog\/?p=726"},"modified":"2020-03-02T10:43:38","modified_gmt":"2020-03-02T13:43:38","slug":"aprendendo-java-para-certificacao-12","status":"publish","type":"post","link":"https:\/\/micheladrianomedeiros.com.br\/blog\/aprendendo-java-para-certificacao-12\/","title":{"rendered":"Aprendendo Java Para Certifica\u00e7\u00e3o #12"},"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-12\/#Complemento_Logico_e_Operadores_de_Negacao\" >Complemento L\u00f3gico e Operadores de Nega\u00e7\u00e3o<\/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-12\/#Operadores_de_Incremento_e_Decremento\" >Operadores de Incremento e Decremento<\/a><\/li><\/ul><\/nav><\/div>\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Complemento_Logico_e_Operadores_de_Negacao\"><\/span><strong>Complemento L\u00f3gico e Operadores de Nega\u00e7\u00e3o<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>O operador l\u00f3gico complementar, !, inverte o valor da express\u00e3o booleana. Por exemplo, se o valor \u00e9 verdadeiro, ele ir\u00e1 converter para falso, e vice versa. Vamos ver um exemplo:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>boolean x = false;\nSystem.out.println(x); \/\/false\nx = !x;\nSystem.out.println(x);\/\/true\n<\/code><\/pre>\n\n\n\n<p>Diferente do operador de nega\u00e7\u00e3o, -, inverte o sinal de uma express\u00e3o num\u00e9rica, veja um exemplo:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>double x = 1.21;\nSystem.out.println(x); \/\/1.21\nx = -x;\nSystem.out.println(x); \/\/-1.21\nx = -x;\nSystem.out.println(x); \/\/1.21\n<\/code><\/pre>\n\n\n\n<p>Baseado na descri\u00e7\u00e3o, pode ser\n\u00f3bvio que alguns operadores requer a vari\u00e1vel ou express\u00e3o na qual eles est\u00e3o agindo\npara especificar o tipo.<\/p>\n\n\n\n<p>Por exemplo, voc\u00ea n\u00e3o pode\naplicar o operador negativo, -, para uma express\u00e3o booleana, assim como voc\u00ea\nn\u00e3o pode aplicar um operador l\u00f3gico, !, em uma express\u00e3o num\u00e9rica.<\/p>\n\n\n\n<p>Cuidado com algumas express\u00f5es que podem falhar na compila\u00e7\u00e3o. Vamos ver alguns exemplos:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int x = !5; \/\/n\u00e3o compila\nboolean y = -true; \/\/n\u00e3o compila\nboolean z = !0; \/\/n\u00e3o compila\n<\/code><\/pre>\n\n\n\n<p>O primeiro exemplo n\u00e3o ir\u00e1\ncompilar pelo fato de que o Java n\u00e3o pode utilizar um operador l\u00f3gico em um\nvalor num\u00e9rico.<\/p>\n\n\n\n<p>O segundo exemplo n\u00e3o ir\u00e1\ncompilar pelo fato de que o Java n\u00e3o pode utilizar um operador negativo para um\nvalor booleano.<\/p>\n\n\n\n<p>O terceiro exemplo al\u00e9m de um valor num\u00e9rico utilizar o valor l\u00f3gico o valor booleano est\u00e1 sendo atribu\u00eddo um n\u00famero.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Operadores_de_Incremento_e_Decremento\"><\/span><strong>Operadores de Incremento e Decremento<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Operadores de incremento e\ndecremento, ++ e &#8211;, respectivamente, pode ser aplicado para operadores\nnum\u00e9ricos e tem alta ordem de preced\u00eancia, comparado aos operadores bin\u00e1rios.\nResumindo, muitas vezes essas opera\u00e7\u00f5es s\u00e3o aplicadas antes das outras.<\/p>\n\n\n\n<p>Operadores de incremento e\ndecremento requer um cuidado especial de quando eles s\u00e3o aplicados, as aplica\u00e7\u00f5es\npodem mudar o resultado da express\u00e3o.<\/p>\n\n\n\n<p>Se o operador \u00e9 colocado antes\ndo operando, \u00e9 chamado de operador de pr\u00e9 incremento ou pr\u00e9 decremento, quando o\noperador \u00e9 aplicado antes do valor retorna um novo valor da express\u00e3o.<\/p>\n\n\n\n<p>Se o operador \u00e9 colocado\ndepois do operando, chamado de operador p\u00f3s incremento ou p\u00f3s decremento,\nquando o operador \u00e9 aplicado depois do valor o valor original da express\u00e3o \u00e9\nretornado.<\/p>\n\n\n\n<p>Vamos a alguns exemplos:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int counter = 0;\nSystem.out.println(counter); \/\/sa\u00edda 0\nSystem.out.println(++counter); \/\/sa\u00edda 1\nSystem.out.println(counter); \/\/sa\u00edda 1\nSystem.out.println(counter--); \/\/sa\u00edda 1\nSystem.out.println(counter); \/\/sa\u00edda 0\n<\/code><\/pre>\n\n\n\n<p>Veja que no incremento do counter\na sa\u00edda \u00e9 1, e quando ocorre o decremento o valor continua 1. Isso significa\nque a pr\u00e9 opera\u00e7\u00e3o \u00e9 executada antes do System.out.println e a p\u00f3s opera\u00e7\u00e3o \u00e9\nexecutada depois do System.out.println.<\/p>\n\n\n\n<p>Vamos ver algumas express\u00f5es:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int x = 3;\nint y = ++x * 5 \/ x-- + --x;\nSystem.out.println(\u201cx \u00e9 \u201c + x);\nSystem.out.println(\u201cy \u00e9 \u201c + y);\n<\/code><\/pre>\n\n\n\n<p>Vamos resolver essa express\u00e3o: o x tem um pr\u00e9 incremento antes de multiplicar por 5, ent\u00e3o essa parte ficar\u00e1 desta maneira:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int y = 4 * 5 \/ x-- + --x;<\/code><\/pre>\n\n\n\n<p>Depois da divis\u00e3o o x tem um p\u00f3s decremento, o valor do x \u00e9 4 e continua com o valor 4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int y = 4 * 5 \/ 4 + --x;<\/code><\/pre>\n\n\n\n<p>No passo final o valor do x\nque \u00e9 4 muda para o valor 3 por causa do p\u00f3s decremento. O decremento acontece depois\nda execu\u00e7\u00e3o da express\u00e3o 4 * 5 \/ 4.<\/p>\n\n\n\n<p>Em seguida tem um pr\u00e9 decremento do x fazendo o valor do x ter agora o valor 2. No final a express\u00e3o fica dessa maneira:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int y = 4 * 5 \/ 4 + 2;<\/code><\/pre>\n\n\n\n<p>Resultado: x \u00e9 2 e y \u00e9 7.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Complemento L\u00f3gico e Operadores de Nega\u00e7\u00e3o O operador l\u00f3gico complementar, !, inverte o valor da express\u00e3o booleana. Por exemplo, se o valor \u00e9 verdadeiro, ele ir\u00e1 converter para falso, e vice versa. Vamos ver um exemplo: Diferente do operador de nega\u00e7\u00e3o, -, inverte o sinal de uma express\u00e3o num\u00e9rica, veja um exemplo: Baseado na descri\u00e7\u00e3o, [&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-726","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 #12 - 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-12\/\" \/>\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 #12\" \/>\n<meta property=\"og:description\" content=\"Complemento L\u00f3gico e Operadores de Nega\u00e7\u00e3o O operador l\u00f3gico complementar, !, inverte o valor da express\u00e3o booleana. Por exemplo, se o valor \u00e9 verdadeiro, ele ir\u00e1 converter para falso, e vice versa. 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