{"id":384,"date":"2019-08-12T14:02:39","date_gmt":"2019-08-12T14:02:39","guid":{"rendered":"https:\/\/micheladrianomedeiros.com.br\/blog\/?p=384"},"modified":"2019-08-12T14:02:41","modified_gmt":"2019-08-12T14:02:41","slug":"programando-por-meio-de-exemplos-java-1","status":"publish","type":"post","link":"https:\/\/micheladrianomedeiros.com.br\/blog\/programando-por-meio-de-exemplos-java-1\/","title":{"rendered":"Programando por Meio de Exemplos Java #1"},"content":{"rendered":"\n<p class=\"has-text-color has-vivid-cyan-blue-color\"><strong>Instalando o Java<\/strong><\/p>\n\n\n\n<p>Antes de come\u00e7armos temos que\ninstalar o JDK. O v\u00eddeo que estou deixando para voc\u00ea ver \u00e9 da instala\u00e7\u00e3o do JDK\n8, mas instale a atual utilizando os mesmos passos. Fa\u00e7a o passo instalando o\nJava deste artigo <a href=\"https:\/\/micheladrianomedeiros.com.br\/blog\/web-services-restful-2\/\">https:\/\/micheladrianomedeiros.com.br\/blog\/web-services-restful-2\/<\/a>.\n<\/p>\n\n\n\n<p>Seria bom tamb\u00e9m voc\u00ea dar uma\nolhada neste v\u00eddeo sobre vari\u00e1veis de ambiente <a href=\"https:\/\/www.youtube.com\/watch?time_continue=0&amp;v=JEszchRN6jI\">https:\/\/www.youtube.com\/watch?time_continue=0&amp;v=JEszchRN6jI<\/a>.<\/p>\n\n\n\n<p class=\"has-text-color has-vivid-cyan-blue-color\"><strong>Executando jshell<\/strong><\/p>\n\n\n\n<p>A ferramenta jshell s\u00f3 est\u00e1\ndispon\u00edvel da vers\u00e3o JDK 9 em diante. Esta ferramenta \u00e9 uma Read-Eval-Print-Loop\n(REPL), muitas linguagens de programa\u00e7\u00e3o cont\u00eam esta ferramenta.<\/p>\n\n\n\n<p>REPL \u00e9 uma ferramenta que\ninterage por meio de prompt e comandos da linguagem. Os comandos s\u00e3o executados\nem loop, por isto sempre esperar\u00e3o o pr\u00f3ximo comando. Esta ferramenta \u00e9 muito\nboa para testar ideias sem precisar editar, compilar e carregar muitos\nrecursos. Os passos s\u00e3o executados de forma transparente quando feitas pela a ferramenta\nREPL. <\/p>\n\n\n\n<p>A ferramenta REPL do Java \u00e9\nchamada de jshell. Para come\u00e7armos, apenas digite no prompt de comando o jshell.\n<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"722\" height=\"254\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/1-4.png\" alt=\"\" class=\"wp-image-385\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/1-4.png 722w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/1-4-300x106.png 300w\" sizes=\"auto, (max-width: 722px) 100vw, 722px\" \/><\/figure><\/div>\n\n\n\n<p>Vamos digitar \/help intro para\nver o que acontece:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"929\" height=\"416\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/2-3.png\" alt=\"\" class=\"wp-image-386\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/2-3.png 929w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/2-3-300x134.png 300w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/2-3-768x344.png 768w\" sizes=\"auto, (max-width: 929px) 100vw, 929px\" \/><\/figure><\/div>\n\n\n\n<p>Podemos ver algumas dicas de\ncomandos que podemos fazer utilizando o jshell. Vamos digitar \/help para vermos\nmais possibilidades de comandos.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"682\" height=\"248\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/3-1.png\" alt=\"\" class=\"wp-image-387\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/3-1.png 682w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/3-1-300x109.png 300w\" sizes=\"auto, (max-width: 682px) 100vw, 682px\" \/><\/figure><\/div>\n\n\n\n<p>Agora apareceu uma grande\nlista de comandos. Vamos testar alguns deles. Vamos come\u00e7ar com o cl\u00e1ssico Hello\nWorld.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"487\" height=\"104\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/4-1.png\" alt=\"\" class=\"wp-image-388\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/4-1.png 487w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/4-1-300x64.png 300w\" sizes=\"auto, (max-width: 487px) 100vw, 487px\" \/><\/figure><\/div>\n\n\n\n<p>\u00c9 um comando simples, mas a\ndiferen\u00e7a \u00e9 que nas vers\u00f5es anteriores da 9 voc\u00ea teria que criar um arquivo\npara conseguir o mesmo resultado. Neste arquivo teria que compilar para criar\num arquivo class o qual deveria ter o m\u00e9todo public static void main, e agora\ncom uma simples linha consegui o mesmo resultado. Note que tamb\u00e9m n\u00e3o precisei\ncolocar ponto e v\u00edrgula no final do comando.<\/p>\n\n\n\n<p>Vamos declarar uma vari\u00e1vel.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"223\" height=\"104\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/5-1.png\" alt=\"\" class=\"wp-image-389\"\/><\/figure><\/div>\n\n\n\n<p>Declaramos uma vari\u00e1vel\nchamada a e com o valor 13. O tipo da vari\u00e1vel \u00e9 int. Agora temos uma vari\u00e1vel\ne podemos executar o seguinte comando para mostrar o valor da vari\u00e1vel.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"334\" height=\"102\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/6.png\" alt=\"\" class=\"wp-image-390\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/6.png 334w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/6-300x92.png 300w\" sizes=\"auto, (max-width: 334px) 100vw, 334px\" \/><\/figure><\/div>\n\n\n\n<p>Vamos fazer algo mais\ncomplexo.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"463\" height=\"220\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/7.png\" alt=\"\" class=\"wp-image-391\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/7.png 463w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/7-300x143.png 300w\" sizes=\"auto, (max-width: 463px) 100vw, 463px\" \/><\/figure><\/div>\n\n\n\n<p>O jshell reconhece que n\u00e3o \u00e9 o\nfim do comando quando voc\u00ea d\u00e1 enter e no fim da linha termina com a chaves, isto\n\u00e9 confirmado quando a linha a seguir come\u00e7a com o seguinte s\u00edmbolo &#8230;&gt;,\nisto significa que voc\u00ea pode continuar digitando os comandos. Veja que ao\nterminar o comando com o fechamento das chaves e pressionar o enter, o comando\n\u00e9 executado. Um erro \u00e9 apresentado, o qual \u00e9 a falta do ponto e v\u00edrgula. A\nomiss\u00e3o do ponto \u00e9 v\u00edrgula s\u00f3 vale para comandos de uma \u00fanica linha, quando \u00e9 um\nexemplo como este que \u00e9 um m\u00e9todo, deve-se colocar o ponto e v\u00edrgula no fim das\nexpress\u00f5es.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"467\" height=\"147\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/8.png\" alt=\"\" class=\"wp-image-392\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/8.png 467w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/8-300x94.png 300w\" sizes=\"auto, (max-width: 467px) 100vw, 467px\" \/><\/figure><\/div>\n\n\n\n<p>Veja que um comando foi criado\ne n\u00e3o executado o que est\u00e1 dentro do m\u00e9todo. Podemos chamar o m\u00e9todo para\nexecutar o que est\u00e1 dentro do m\u00e9todo.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"209\" height=\"112\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/9.png\" alt=\"\" class=\"wp-image-393\"\/><\/figure><\/div>\n\n\n\n<p>Podemos listar todos os\ncomandos que fizemos at\u00e9 agora com a seguinte execu\u00e7\u00e3o.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"464\" height=\"279\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/10.png\" alt=\"\" class=\"wp-image-394\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/10.png 464w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/10-300x180.png 300w\" sizes=\"auto, (max-width: 464px) 100vw, 464px\" \/><\/figure><\/div>\n\n\n\n<p>Voc\u00ea pode salvar tudo o que\nfoi digitado em um arquivo java, por exemplo, vamos salvar com o nome de HelloWorld.java\ne depois sair do jshell.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"336\" height=\"152\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/11.png\" alt=\"\" class=\"wp-image-395\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/11.png 336w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/11-300x136.png 300w\" sizes=\"auto, (max-width: 336px) 100vw, 336px\" \/><\/figure><\/div>\n\n\n\n<p>O arquivo salvo fica desta\nmaneira.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"472\" height=\"181\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/12.png\" alt=\"\" class=\"wp-image-396\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/12.png 472w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/12-300x115.png 300w\" sizes=\"auto, (max-width: 472px) 100vw, 472px\" \/><\/figure><\/div>\n\n\n\n<p>Caso queira limpar tudo o que\nvoc\u00ea j\u00e1 digitou, basta fazer o comando \/reset.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"237\" height=\"331\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/13.png\" alt=\"\" class=\"wp-image-397\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/13.png 237w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/08\/13-215x300.png 215w\" sizes=\"auto, (max-width: 237px) 100vw, 237px\" \/><\/figure><\/div>\n\n\n\n<p class=\"has-text-color has-background has-very-light-gray-color has-vivid-cyan-blue-background-color\"><a rel=\"noreferrer noopener\" target=\"_blank\" href=\"https:\/\/www.amazon.com.br\/gp\/offer-listing\/178646828X\/ref=as_li_tl?ie=UTF8&amp;camp=1789&amp;creative=9325&amp;creativeASIN=178646828X&amp;linkCode=am2&amp;tag=blackzig0b-20&amp;linkId=66a7f0bc0853beef2702edf81bbd176e\"><strong>Java 9 Programming By Example<\/strong><\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/amzn.to\/2H28L9c\">https:\/\/amzn.to\/2H28L9c<\/a><\/p>\n\n\n\n<p>#java #jshell<\/p>\n\n\n","protected":false},"excerpt":{"rendered":"<p>Instalando o Java Antes de come\u00e7armos temos que instalar o JDK. O v\u00eddeo que estou deixando para voc\u00ea ver \u00e9 da instala\u00e7\u00e3o do JDK 8, mas instale a atual utilizando os mesmos passos. Fa\u00e7a o passo instalando o Java deste artigo https:\/\/micheladrianomedeiros.com.br\/blog\/web-services-restful-2\/. Seria bom tamb\u00e9m voc\u00ea dar uma olhada neste v\u00eddeo sobre vari\u00e1veis de ambiente [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":297,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[76],"class_list":["post-384","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-jshell"],"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>Programando por Meio de Exemplos Java #1 - 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\/programando-por-meio-de-exemplos-java-1\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Programando por Meio de Exemplos Java #1\" \/>\n<meta property=\"og:description\" content=\"Instalando o Java Antes de come\u00e7armos temos que instalar o JDK. 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