{"id":675,"date":"2020-01-22T09:58:56","date_gmt":"2020-01-22T12:58:56","guid":{"rendered":"https:\/\/micheladrianomedeiros.com.br\/blog\/?p=675"},"modified":"2020-01-22T09:58:58","modified_gmt":"2020-01-22T12:58:58","slug":"kotlin-para-android-4","status":"publish","type":"post","link":"https:\/\/micheladrianomedeiros.com.br\/blog\/kotlin-para-android-4\/","title":{"rendered":"Kotlin para Android #4"},"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\/kotlin-para-android-4\/#Classes_e_Objetos_Filosofia_da_Orientacao_a_Objetos\" >Classes e Objetos: Filosofia da Orienta\u00e7\u00e3o a Objetos<\/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\/kotlin-para-android-4\/#Kotlin_e_Programacao_Orientada_a_Objetos\" >Kotlin e Programa\u00e7\u00e3o Orientada\na Objetos<\/a><\/li><\/ul><\/nav><\/div>\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Classes_e_Objetos_Filosofia_da_Orientacao_a_Objetos\"><\/span> <strong>Classes e Objetos: Filosofia da Orienta\u00e7\u00e3o a Objetos<\/strong> <span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Um conceito importante de\nentender \u00e9 que Invoice n\u00e3o \u00e9 um objeto, nem uma Pessoa e nem um Tri\u00e2ngulo.<\/p>\n\n\n\n<p>Ent\u00e3o o que \u00e9? Estamos falando\nde Invoice e n\u00e3o de invoice. H\u00e1 uma grande diferen\u00e7a entre os dois:<\/p>\n\n\n\n<p>Um invoice, ou um invoice em\nparticular \u00e9 um objeto, mas o Invoice \u00e9 uma classifica\u00e7\u00e3o ou classe.<\/p>\n\n\n\n<p>Tudo sobre invoices est\u00e3o na\nclasse Invoice, e todas as pessoas est\u00e3o na classe Pessoa e tudo relacionado ao\ntri\u00e2ngulo est\u00e1 na classe Tri\u00e2ngulo.<\/p>\n\n\n\n<p>Isto parece bem \u00f3bvio, n\u00e3o \u00e9?\nTalvez, mas o mais importante \u00e9 se realmente entendermos como funciona a classe.<\/p>\n\n\n\n<p>Imagine milhares de invoices\nchegando em um programa de computador e escrevemos algo como:<\/p>\n\n\n\n<p>object1 = Invoice(Buyer = Smith, Date = 20180923, Good\n= Peas, Cost = $23.99), objetc2 = Invoice(\u2026), \u2026, object1000 = Invoice(\u2026)<\/p>\n\n\n\n<p>Isto n\u00e3o faz sentido, porque\nn\u00f3s n\u00e3o queremos escrever c\u00f3digos gigantes todos os dias.<\/p>\n\n\n\n<p>O que faz mas sentido \u00e9 termos\numa classe Invoice que cuide de todos os invoices. Esta classe precisar criar\ninvoices quando entramos com dados. Algo do tipo:<\/p>\n\n\n\n<p>Data = [entrada de dados]<\/p>\n\n\n\n<p>Desta maneira, cada dado\nestar\u00e1 ligado a um invoice. Os dados devem representar as caracter\u00edsticas da\nclasse Invoice, tais como buyer, date, goods ou servi\u00e7os. \u00c9 como se o Invoice\nfosse um validador de dados.<\/p>\n\n\n\n<p>object = representa\u00e7\u00e3o do\nobjeto concreto utilizando dados de computador<\/p>\n\n\n\n<p>Voc\u00ea pode construir um objeto\ninvoice, dando a ele uma classifica\u00e7\u00e3o e dados que o represente.<\/p>\n\n\n\n<p>Quando constru\u00edmos um objeto\ninvoice, estamos construindo um objeto da classe Invoice ou criando uma inst\u00e2ncia\nda classe. Vamos listar algumas defini\u00e7\u00f5es:<\/p>\n\n\n\n<p>Classe: uma classe descreve objetos\nde alguma maneira. Todo objeto pertence a uma classe.<\/p>\n\n\n\n<p>Inst\u00e2ncia: uma inst\u00e2ncia de classe\nrepresenta exatamente um objeto da classe. O processo de cria\u00e7\u00e3o de um objeto\nde uma classe e pronto para receber dados \u00e9 chamado de instancia\u00e7\u00e3o.<\/p>\n\n\n\n<p>Constru\u00e7\u00e3o: o processo de\ncria\u00e7\u00e3o de uma inst\u00e2ncia tamb\u00e9m \u00e9 chamado de constru\u00e7\u00e3o.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Kotlin_e_Programacao_Orientada_a_Objetos\"><\/span><strong>Kotlin e Programa\u00e7\u00e3o Orientada\na Objetos<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Declara\u00e7\u00e3o de uma classe descreve\na estrutura e suas partes. No Kotlin podemos declarar uma classe escrevendo:<\/p>\n\n\n\n<p>class NomeDaClasse(Par\u00e2metro-nome1,\nPar\u00e2metro-nome2, &#8230;){<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [Corpo da Classe]<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<p>NomeDaClasse: \u00e9 o nome da\nclasse. N\u00e3o deve conter espa\u00e7os, por conven\u00e7\u00e3o no Kotlin \u00e9 utilizado o CamelCase,\nisto quer dizer que voc\u00ea deve come\u00e7ar com letra mai\u00fascula e cada nova palavra a\nprimeira letra tamb\u00e9m ser mai\u00fascula. Por exemplo, RegistroDeEmpregado.<\/p>\n\n\n\n<p>Par\u00e2metro-nome: essas s\u00e3o\ndeclara\u00e7\u00f5es do que \u00e9 necess\u00e1rio para criar uma inst\u00e2ncia de classe. Basicamente\nh\u00e1 tr\u00eas tipos de varia\u00e7\u00f5es de par\u00e2metros:<\/p>\n\n\n\n<p>Vari\u00e1vel-Nome:Vari\u00e1vel-Tipo: um\nexemplo seria userName:String. Usa-se esta estrutura para passar par\u00e2metros para\ninstanciar uma classe.<\/p>\n\n\n\n<p>val Vari\u00e1vel-Nome:Vari\u00e1vel-Tipo:\nexemplo, val userName:String. Utilizado para definir propriedades imut\u00e1veis. Esse\npar\u00e2metro \u00e9 usado para configurar partes de estado de um objeto.<\/p>\n\n\n\n<p>var Vari\u00e1vel-Nome:Vari\u00e1vel-Tipo:\nexemplo, var userName:String. Utilizado para definir propriedades mut\u00e1veis. Esse\npar\u00e2metro \u00e9 usado para configurar partes de estado de um objeto.<\/p>\n\n\n\n<p>Veja que tamb\u00e9m os nomes dos\npar\u00e2metros utilizamos o CamelCase. H\u00e1 outros tipos vari\u00e1veis. Por exemplo, voc\u00ea\npode utilizar Int para um inteiro e declarar desta maneira: val a:Int.<\/p>\n\n\n\n<p>[Corpo da Classe]: aqui ser\u00e1 a codifica\u00e7\u00e3o da classe, onde estar\u00e3o as suas fun\u00e7\u00f5es e propriedades.<\/p>\n\n\n\n<p> Fonte livro:\u00a0Learn\u00a0Kotlin\u00a0for Android\u00a0Development: The Next\u00a0Generation\u00a0Language\u00a0for\u00a0Modern\u00a0Android Apps\u00a0Programming\u00a0 <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Classes e Objetos: Filosofia da Orienta\u00e7\u00e3o a Objetos Um conceito importante de entender \u00e9 que Invoice n\u00e3o \u00e9 um objeto, nem uma Pessoa e nem um Tri\u00e2ngulo. Ent\u00e3o o que \u00e9? Estamos falando de Invoice e n\u00e3o de invoice. H\u00e1 uma grande diferen\u00e7a entre os dois: Um invoice, ou um invoice em particular \u00e9 um [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":130,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-675","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kotlin"],"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>Kotlin para Android #4 - 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\/kotlin-para-android-4\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Kotlin para Android #4\" \/>\n<meta property=\"og:description\" content=\"Classes e Objetos: Filosofia da Orienta\u00e7\u00e3o a Objetos Um conceito importante de entender \u00e9 que Invoice n\u00e3o \u00e9 um objeto, nem uma Pessoa e nem um Tri\u00e2ngulo. Ent\u00e3o o que \u00e9? Estamos falando de Invoice e n\u00e3o de invoice. 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