{"id":733,"date":"2020-03-10T10:25:00","date_gmt":"2020-03-10T13:25:00","guid":{"rendered":"https:\/\/micheladrianomedeiros.com.br\/blog\/?p=733"},"modified":"2020-03-10T12:02:42","modified_gmt":"2020-03-10T15:02:42","slug":"aprendendo-java-para-certificacao-13","status":"publish","type":"post","link":"https:\/\/micheladrianomedeiros.com.br\/blog\/aprendendo-java-para-certificacao-13\/","title":{"rendered":"Aprendendo Java Para Certifica\u00e7\u00e3o #13"},"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-13\/#Operadores_de_Atribuicao\" >Operadores de Atribui\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-13\/#Casting_Valores_Primitivos\" >Casting Valores Primitivos<\/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-13\/#Baixe_o_Ebook_da_Certificacao_Java_Volume_2\" >Baixe o Ebook da Certifica\u00e7\u00e3o Java Volume 2<\/a><\/li><\/ul><\/nav><\/div>\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Operadores_de_Atribuicao\"><\/span><strong>Operadores de Atribui\u00e7\u00e3o<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Um operador de atribui\u00e7\u00e3o \u00e9 um\noperador bin\u00e1rio que modifica ou atribui a vari\u00e1vel do lado esquerdo do operador\ncom o resultado a direita da equa\u00e7\u00e3o.<\/p>\n\n\n\n<p>O operador de atribui\u00e7\u00e3o mais\nsimples \u00e9 o =, o qual voc\u00ea j\u00e1 conhece:<\/p>\n\n\n\n<p>int x = 1;<\/p>\n\n\n\n<p>Essa instru\u00e7\u00e3o atribui x o valor\n1.<\/p>\n\n\n\n<p>Java ir\u00e1 automaticamente promover\num valor menor para de um tipo maior, mas haver\u00e1 uma exce\u00e7\u00e3o se voc\u00ea tentar converter\num n\u00famero maior para de um menor tipo.<\/p>\n\n\n\n<p>Vamos ver alguns exemplos:<\/p>\n\n\n\n<p>int x = 1.0 \/\/ n\u00e3o compila<\/p>\n\n\n\n<p>short y = 1921222; \/\/ n\u00e3o\ncompila<\/p>\n\n\n\n<p>int z = 9f; \/\/ n\u00e3o compila<\/p>\n\n\n\n<p>long t = 192301398193810323;\n\/\/ n\u00e3o compila<\/p>\n\n\n\n<p>O primeiro exemplo n\u00e3o compila\nporque o valor 1.0 \u00e9 um double e double \u00e9 maior que int.<\/p>\n\n\n\n<p>O segundo exemplo tem o valor 1921222\natribu\u00eddo ao um tipo short, s\u00f3 que o short suporta um n\u00famero positivo de no m\u00e1ximo\n32767.<\/p>\n\n\n\n<p>O terceiro exemplo segue o\nmesmo princ\u00edpio do primeiro exemplo, o tipo float \u00e9 maior do que o tipo int.<\/p>\n\n\n\n<p>O quarto exemplo compilaria se\nfosse colocado ao fim do valor 192301398193810323 a letra L. Como isso n\u00e3o foi\nfeito o Java considera o valor literal, ou seja, ele ir\u00e1 tratar esse valor como\num int e o valor atribu\u00eddo passa da capacidade de suporte do int.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Casting_Valores_Primitivos\"><\/span><strong>Casting Valores Primitivos<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Podemos consertar os erros de\ncompila\u00e7\u00e3o nos exemplos anteriores utilizando o casting. O casting ir\u00e1 fazer a\nconvers\u00e3o de um n\u00famero de tipo maior para um menor.<\/p>\n\n\n\n<p>int x = (int) 1.0;<\/p>\n\n\n\n<p>short y = (short) 1921222; \/\/ armazena\ncom o valor 20678<\/p>\n\n\n\n<p>int z = (int) 9f;<\/p>\n\n\n\n<p>long t = 192301398193810323L;<\/p>\n\n\n\n<p>O problema do casting \u00e9 que se\nvoc\u00ea converter um n\u00famero maior do que caberia em um tipo o resultado ser\u00e1 um\nn\u00famero totalmente diferente do valor original. O exemplo do short representa\nesse problema.<\/p>\n\n\n\n<p>Veja a seguinte situa\u00e7\u00e3o:<\/p>\n\n\n\n<p>short x = 10;<\/p>\n\n\n\n<p>short y = 3;<\/p>\n\n\n\n<p>short z = x * y; \/* incompatible types: possible lossy conversion from int to short *\/<\/p>\n\n\n\n<p>Voc\u00ea pode achar estranho n\u00e3o\ncompilar, porque afinal o valor 30 cabe no short que tem valor positivo m\u00e1ximo 32767.<\/p>\n\n\n\n<p>Acontece que n\u00e3o \u00e9 assim que o\nJava trata a situa\u00e7\u00e3o. Lembre-se que todo valor inteiro literal \u00e9 tratado como\nint pelo java, sendo assim, o Java est\u00e1 pensando que voc\u00ea quer atribuir um valor\nint ao short, e como vimos um tipo maior n\u00e3o \u00e9 promovido automaticamente para\num tipo menor.<\/p>\n\n\n\n<p>Para essa express\u00e3o funcionar devemos\ndizer ao Java que estamos fazendo uma multiplica\u00e7\u00e3o com short, e para isso temos\nque fazer o casting.<\/p>\n\n\n\n<p>short z = (short) (x * y); \/\/ agora sim, est\u00e1 tudo certo.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Baixe_o_Ebook_da_Certificacao_Java_Volume_2\"><\/span>Baixe o Ebook da Certifica\u00e7\u00e3o Java Volume 2<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/03\/AJPCV2.png\" alt=\"\" class=\"wp-image-735\"\/><\/figure><\/div>\n\n\n\n<style>\n #_form_39_ { font-size:14px; 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