{"id":722,"date":"2020-02-25T16:46:46","date_gmt":"2020-02-25T19:46:46","guid":{"rendered":"https:\/\/micheladrianomedeiros.com.br\/blog\/?p=722"},"modified":"2020-02-25T16:46:48","modified_gmt":"2020-02-25T19:46:48","slug":"aprendendo-java-para-certificacao-11","status":"publish","type":"post","link":"https:\/\/micheladrianomedeiros.com.br\/blog\/aprendendo-java-para-certificacao-11\/","title":{"rendered":"Aprendendo Java Para Certifica\u00e7\u00e3o #11"},"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-11\/#Operadores_Aritmeticos\" >Operadores Aritm\u00e9ticos<\/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-11\/#Promocao_Numerica\" >Promo\u00e7\u00e3o Num\u00e9rica<\/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-11\/#Trabalhando_com_Operadores_Unitario\" >Trabalhando com Operadores\nUnit\u00e1rio<\/a><\/li><\/ul><\/nav><\/div>\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Operadores_Aritmeticos\"><\/span><strong>Operadores Aritm\u00e9ticos<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Operadores aritm\u00e9ticos s\u00e3o muitas\nvezes encontrados na matem\u00e1tica que inclui a adi\u00e7\u00e3o (+), subtra\u00e7\u00e3o (-),\nmultiplica\u00e7\u00e3o (*), divis\u00e3o (\/) e m\u00f3dulo (%).<\/p>\n\n\n\n<p>S\u00e3o tamb\u00e9m inclu\u00eddos os operadores\nunit\u00e1rios, ++ e &#8211;. H\u00e1 tamb\u00e9m a regra de ordem de preval\u00eancia dos operadores.<\/p>\n\n\n\n<p>Por exemplo, os operadores (*, \/, %) tem preval\u00eancia diante os operadores (+, -). Vejamos a seguinte express\u00e3o:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int x = 2 * 5 + 3 * 4 - 8;<\/code><\/pre>\n\n\n\n<p>Primeiro devemos resolver as multiplica\u00e7\u00f5es, fazendo isso a express\u00e3o diminui.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int x = 10 + 12 - 8;<\/code><\/pre>\n\n\n\n<p>Agora com os termos restantes que\ntem a mesma relev\u00e2ncia, temos que resolver a express\u00e3o da esquerda para direita.\nO resultado do x ser\u00e1 14.<\/p>\n\n\n\n<p>Se n\u00e3o houver par\u00eanteses na express\u00e3o, deve-se seguir a regra apresentada. Vamos ver um exemplo com par\u00eanteses.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int x = 2 * ((5 + 3) * 4 \u2013 8);<\/code><\/pre>\n\n\n\n<p>A regra para resolver a express\u00e3o \u00e9 a mesma, a \u00fanica coisa que muda \u00e9 que temos que resolver primeiro as express\u00f5es que est\u00e3o dentro dos par\u00eanteses.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int x = 2 * (8 * 4 - 8);<\/code><\/pre>\n\n\n\n<p>Novamente, vamos resolver a express\u00e3o dentro do par\u00eantese, seguindo a regra de preval\u00eancia.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int x = 2 * (32 \u2013 8);<\/code><\/pre>\n\n\n\n<p>Antes de multiplicar por 2, temos que resolver a express\u00e3o dentro dos par\u00eanteses.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int x = 2 * 24;<\/code><\/pre>\n\n\n\n<p>Agora sim faz-se a\nmultiplica\u00e7\u00e3o por dois e o resultado \u00e9 48.<\/p>\n\n\n\n<p>Todas as opera\u00e7\u00f5es aritm\u00e9ticas\npodem ser utilizadas nas vari\u00e1veis primitivas do Java, exceto o boolean.<\/p>\n\n\n\n<p>Na classe String os operadores\nde adi\u00e7\u00e3o (+) e (+=) podem ser utilizados para aplicar valores ao String, isso\nir\u00e1 resultar na concatena\u00e7\u00e3o da String.<\/p>\n\n\n\n<p>Caso n\u00e3o saiba o operador m\u00f3dulo\n(%) ir\u00e1 trazer o resultado do resto de uma divis\u00e3o. Por exemplo: 9 % 3 = 0 e 11\n% 3 = 2.<\/p>\n\n\n\n<p>Comparando divis\u00e3o e m\u00f3dulo:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>System.out.println(9 \/ 3); \/\/ resultado 3\nSystem.out.println(9 % 3); \/\/ resultado 0\nSystem.out.println(10 \/ 3); \/\/ resultado 3\nSystem.out.println(10 % 3); \/\/ resultado 1\nSystem.out.println(11 \/ 3); \/\/ resultado 3\nSystem.out.println(11 % 3); \/\/ resultado 2\nSystem.out.println(12 \/ 3); \/\/ resultado 4\nSystem.out.println(12 % 3); \/\/ resultado 0\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Promocao_Numerica\"><\/span><strong>Promo\u00e7\u00e3o Num\u00e9rica<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Algumas convers\u00f5es num\u00e9ricas\ns\u00e3o feitas automaticamente pelo Java. Todo n\u00famero inteiro \u00e9 tratado pelo Java como\nint e todo n\u00famero fracionado \u00e9 tratado como double.<\/p>\n\n\n\n<p>Isso quer dizer que se voc\u00ea\ndeclarar que uma vari\u00e1vel float \u00e9 igual a 2.5 (float = 2.5;), o Java vai tratar\ncomo (double = 2.5;). A n\u00e3o ser que voc\u00ea especifique que o Java trate como\nfloat, fazendo o seguinte: float = 2.5F;<\/p>\n\n\n\n<p>O Java s\u00f3 faz a convers\u00e3o\nautom\u00e1tica quando o n\u00famero escolhido \u00e9 menor do que o padr\u00e3o. <\/p>\n\n\n\n<p>No exemplo do float, o float tem\nmenor capacidade de guardar valores do que o double, sendo assim mesmo que voc\u00ea\ncolocasse um valor acima do que o float suporta, o Java trataria como double,\nporque como mencionado o Java trata valores fracionados n\u00e3o especificados como\ndouble.<\/p>\n\n\n\n<p>Vamos enumerar algumas regras:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Se\ndois valores t\u00eam diferentes tipos, o Java ir\u00e1 automaticamente promover o valor para\no mais alto dos dois tipos.<\/li><li>Se um valor\n\u00e9 inteiro e o outro fracionado, o Java ir\u00e1 automaticamente promover o valor\ninteiro para o tipo fracionado.<\/li><li>Os\ntipos pequenos como o byte, short e char s\u00e3o promovidos para o tipo int, mesmo\nque n\u00e3o haja um tipo int no meio da opera\u00e7\u00e3o.<\/li><li>Depois\nque as promo\u00e7\u00f5es num\u00e9ricas forem executadas o resultado da opera\u00e7\u00e3o ser\u00e1 do\ntipo promovido.<\/li><\/ol>\n\n\n\n<p>Vamos ver alguns exemplos:<\/p>\n\n\n\n<p>Qual ser\u00e1 o tipo do resultado para a express\u00e3o x * y?<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int x = 1;\nlong y = 33;\n<\/code><\/pre>\n\n\n\n<p>Seguindo a primeira regra o long tem um tipo maior que int, ent\u00e3o o resultado ser\u00e1 do tipo long.<\/p>\n\n\n\n<p>Qual ser\u00e1 o tipo do resultado para a express\u00e3o x + y?<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>double x = 39.21;\nfloat y = 2.1;\n<\/code><\/pre>\n\n\n\n<p>Nessa situa\u00e7\u00e3o n\u00e3o entra em\nnenhuma das quatro regras. Vai acontecer o que foi explicado nas convers\u00f5es\nautom\u00e1tica do Java.<\/p>\n\n\n\n<p>Qual ser\u00e1 o tipo do resultado para a express\u00e3o x \/ y?<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>short x = 10;\nshort y = 3;\n<\/code><\/pre>\n\n\n\n<p>Nessa express\u00e3o ser\u00e1 utilizada\na regra 3. Ent\u00e3o o resultado ser\u00e1 int.<\/p>\n\n\n\n<p>Qual ser\u00e1 o tipo do resultado para a express\u00e3o x * y \/ z?<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>short x = 14;\nfloat y = 13;\ndouble z = 30;\n<\/code><\/pre>\n\n\n\n<p>Nessa express\u00e3o o short ser\u00e1\nconvertido automaticamente para int pela convers\u00e3o autom\u00e1tica.<\/p>\n\n\n\n<p>Para x * y ser executado o\nshort que foi modificado para int ser\u00e1 modificado novamente para float,\nseguindo a primeira regra.<\/p>\n\n\n\n<p>S\u00f3 que o float n\u00e3o est\u00e1 especificado como float (float y = 13F;), sendo assim como j\u00e1 vimos, o Java ir\u00e1 tratar o y como double. No fim, essa express\u00e3o ter\u00e1 o resultado do tipo double.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Trabalhando_com_Operadores_Unitario\"><\/span><strong>Trabalhando com Operadores\nUnit\u00e1rio<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Por defini\u00e7\u00e3o, um operador\nunit\u00e1rio requer exatamente um operando ou vari\u00e1vel para a fun\u00e7\u00e3o.<\/p>\n\n\n\n<p>Veja a tabela como as opera\u00e7\u00f5es s\u00e3o simples, um incrementa mais 1 ao valor de uma vari\u00e1vel, outro apenas inverte o valor de um booleano.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"809\" height=\"365\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/02\/Java-Unary-Operator.png\" alt=\"\" class=\"wp-image-723\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/02\/Java-Unary-Operator.png 809w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/02\/Java-Unary-Operator-300x135.png 300w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/02\/Java-Unary-Operator-768x347.png 768w\" sizes=\"auto, (max-width: 809px) 100vw, 809px\" \/><\/figure><\/div>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Operadores Aritm\u00e9ticos Operadores aritm\u00e9ticos s\u00e3o muitas vezes encontrados na matem\u00e1tica que inclui a adi\u00e7\u00e3o (+), subtra\u00e7\u00e3o (-), multiplica\u00e7\u00e3o (*), divis\u00e3o (\/) e m\u00f3dulo (%). S\u00e3o tamb\u00e9m inclu\u00eddos os operadores unit\u00e1rios, ++ e &#8211;. H\u00e1 tamb\u00e9m a regra de ordem de preval\u00eancia dos operadores. Por exemplo, os operadores (*, \/, %) tem preval\u00eancia diante os operadores [&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-722","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 #11 - 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-11\/\" \/>\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 #11\" \/>\n<meta property=\"og:description\" content=\"Operadores Aritm\u00e9ticos Operadores aritm\u00e9ticos s\u00e3o muitas vezes encontrados na matem\u00e1tica que inclui a adi\u00e7\u00e3o (+), subtra\u00e7\u00e3o (-), multiplica\u00e7\u00e3o (*), divis\u00e3o (\/) e m\u00f3dulo (%). 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