{"id":935,"date":"2020-06-09T13:38:41","date_gmt":"2020-06-09T16:38:41","guid":{"rendered":"https:\/\/micheladrianomedeiros.com.br\/blog\/?p=935"},"modified":"2020-06-09T13:40:43","modified_gmt":"2020-06-09T16:40:43","slug":"programando-por-meio-de-exemplos-java-3","status":"publish","type":"post","link":"https:\/\/micheladrianomedeiros.com.br\/blog\/programando-por-meio-de-exemplos-java-3\/","title":{"rendered":"Programando por Meio de Exemplos Java #3"},"content":{"rendered":"\n<p>Se voc\u00ea configurar o arquivo startup, ent\u00e3o os comandos listados no arquivo startup ser\u00e3o executados ao inv\u00e9s de construir comandos no jshell depois do comando \/reset.<\/p>\n\n\n\n<p>Isso tamb\u00e9m significa que voc\u00ea n\u00e3o ser\u00e1 capaz de usar as classes diretamente que s\u00e3o importadas por padr\u00e3o e voc\u00ea n\u00e3o ir\u00e1 ter o m\u00e9todo printf, a n\u00e3o ser que o seu arquivo startup contenham os imports.<\/p>\n\n\n\n<p>Cria o arquivo sample.startup:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"539\" height=\"269\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-14.png\" alt=\"\" class=\"wp-image-937\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-14.png 539w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-14-300x150.png 300w\" sizes=\"auto, (max-width: 539px) 100vw, 539px\" \/><\/figure><\/div>\n\n\n\n<p>Agora execute os comandos:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"377\" height=\"300\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-15.png\" alt=\"\" class=\"wp-image-938\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-15.png 377w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-15-300x239.png 300w\" sizes=\"auto, (max-width: 377px) 100vw, 377px\" \/><\/figure><\/div>\n\n\n\n<p>O m\u00e9todo println \u00e9 definido, mas o m\u00e9todo printf o qual foi definido por padr\u00e3o no startup n\u00e3o est\u00e1.<\/p>\n\n\n\n<p>O prompt jshell tem o feedback quem mostra as respostas e espera entrada de dados, o prompt tem v\u00e1rias maneiras de mostrar as mensagens. Tem modelos pr\u00e9 definidos:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Normal<\/li><li>Silent<\/li><li>Concise<\/li><li>Verbose<\/li><\/ul>\n\n\n\n<p>O Normal \u00e9 selecionado por padr\u00e3o. Se voc\u00ea digitar \/set feedback silent, o prompt retorna -> e jshell n\u00e3o ir\u00e1 detalhar os comandos. O \/set feedback concise imprime um pouco de informa\u00e7\u00e3o e \/set feedback verbose imprime informa\u00e7\u00f5es sobre os comandos executados:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"325\" height=\"227\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-16.png\" alt=\"\" class=\"wp-image-939\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-16.png 325w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-16-300x210.png 300w\" sizes=\"auto, (max-width: 325px) 100vw, 325px\" \/><\/figure><\/div>\n\n\n\n<p>Para sair do jshell digite o comando \/exit. Assim voc\u00ea ir\u00e1 retornar para prompt do sistema operacional.<\/p>\n\n\n\n<p>Vamos pegar o programa HelloWorld.java. O conte\u00fado \u00e9 esse:<\/p>\n\n\n\n<p>public class HelloWorld{<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public static void main(String[] args){<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; System.out.println(&#8220;Hello World!&#8221;);<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<p>Para compilar o c\u00f3digo execute o comando javac HelloWorld.java.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"334\" height=\"116\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-17.png\" alt=\"\" class=\"wp-image-940\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-17.png 334w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-17-300x104.png 300w\" sizes=\"auto, (max-width: 334px) 100vw, 334px\" \/><\/figure><\/div>\n\n\n\n<p>Esse comando gera um arquivo .class no mesmo diret\u00f3rio. Para executar o programa fa\u00e7a o comando java HelloWorld.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"334\" height=\"126\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-18.png\" alt=\"\" class=\"wp-image-941\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-18.png 334w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-18-300x113.png 300w\" sizes=\"auto, (max-width: 334px) 100vw, 334px\" \/><\/figure><\/div>\n\n\n\n<p>Dessa maneira voc\u00ea criou e executou o sue primeiro programa Java.<\/p>\n\n\n\n<p>No Java, voc\u00ea n\u00e3o pode ter m\u00e9todo ou fun\u00e7\u00f5es <a href=\"https:\/\/pt.wikipedia.org\/wiki\/Standalone\" target=\"_blank\" rel=\"noreferrer noopener\">standalone<\/a>, como em outras linguagens. Todo m\u00e9todo pertence a uma classe e todo classe pode ser declarado em um arquivo separado.<\/p>\n\n\n\n<p>O nome do arquivo tem o mesmo nome da classe. O compilador requer que a classe seja p\u00fablica. Mesmo classes n\u00e3o p\u00fablicas costumam seguir essa conven\u00e7\u00e3o.<\/p>\n\n\n\n<p>Se voc\u00ea renomear o arquivo HelloWorld.java para Hello.java, o compilador ir\u00e1 mostrar um erro quando tentar compilar o arquivo com o novo nome.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"566\" height=\"106\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-19.png\" alt=\"\" class=\"wp-image-942\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-19.png 566w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-19-300x56.png 300w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/06\/image-19-560x106.png 560w\" sizes=\"auto, (max-width: 566px) 100vw, 566px\" \/><\/figure><\/div>\n\n\n\n<p>A declara\u00e7\u00e3o da classe come\u00e7a com a palavra class, depois do nome da classe abre-se um par de chaves. Tudo dentro das chaves pertence a classe.<\/p>\n\n\n\n<p>Por enquanto esque\u00e7a a palavra public e vamos ver o m\u00e9todo main. O m\u00e9todo n\u00e3o retorna nenhum valor, al\u00e9m disso, o retorno do valor \u00e9 void.<\/p>\n\n\n\n<p>O argumento chamado args, \u00e9 uma String de array. Quando a JVM come\u00e7a o m\u00e9todo main, passa os argumentos para o programa que est\u00e1 dentro desse array. No momento nada \u00e9 passado nesse array.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Links<\/h4>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"https:\/\/cursojavanow.com.br\/o-metodo-main\/\" target=\"_blank\">O M\u00e9todo main()<\/a><\/p>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"https:\/\/cursojavanow.com.br\/?s=m%C3%A9todo+main\" target=\"_blank\">Outros artigos<\/a><\/p>\n\n\n\n<figure class=\"wp-block-embed-youtube aligncenter wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"video_embed clearfix\"><div class=\"video_embed clearfix\"><iframe loading=\"lazy\" title=\"Aula 4: Primeiro Programa com Texto\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/sCfFwLdFAHc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div><\/div>\n<\/div><\/figure>\n\n\n\n<p>Fonte: Java 9 Programming By Example<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Se voc\u00ea configurar o arquivo startup, ent\u00e3o os comandos listados no arquivo startup ser\u00e3o executados ao inv\u00e9s de construir comandos no jshell depois do comando \/reset. Isso tamb\u00e9m significa que voc\u00ea n\u00e3o ser\u00e1 capaz de usar as classes diretamente que s\u00e3o importadas por padr\u00e3o e voc\u00ea n\u00e3o ir\u00e1 ter o m\u00e9todo printf, a n\u00e3o ser [&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":[],"class_list":["post-935","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","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>Programando por Meio de Exemplos Java #3 - 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-3\/\" \/>\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 #3\" \/>\n<meta property=\"og:description\" content=\"Se voc\u00ea configurar o arquivo startup, ent\u00e3o os comandos listados no arquivo startup ser\u00e3o executados ao inv\u00e9s de construir comandos no jshell depois do comando \/reset. Isso tamb\u00e9m significa que voc\u00ea n\u00e3o ser\u00e1 capaz de usar as classes diretamente que s\u00e3o importadas por padr\u00e3o e voc\u00ea n\u00e3o ir\u00e1 ter o m\u00e9todo printf, a n\u00e3o ser [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/micheladrianomedeiros.com.br\/blog\/programando-por-meio-de-exemplos-java-3\/\" \/>\n<meta property=\"og:site_name\" content=\"Viciados em Aprender\" \/>\n<meta property=\"article:published_time\" content=\"2020-06-09T16:38:41+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-06-09T16:40:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2019\/07\/10711580.png\" \/>\n\t<meta property=\"og:image:width\" content=\"400\" \/>\n\t<meta property=\"og:image:height\" content=\"400\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"blackzig\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"blackzig\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/micheladrianomedeiros.com.br\\\/blog\\\/programando-por-meio-de-exemplos-java-3\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/micheladrianomedeiros.com.br\\\/blog\\\/programando-por-meio-de-exemplos-java-3\\\/\"},\"author\":{\"name\":\"blackzig\",\"@id\":\"https:\\\/\\\/micheladrianomedeiros.com.br\\\/blog\\\/#\\\/schema\\\/person\\\/687a6d17428a0f0e040aefbd858ebc1e\"},\"headline\":\"Programando por Meio de Exemplos Java #3\",\"datePublished\":\"2020-06-09T16:38:41+00:00\",\"dateModified\":\"2020-06-09T16:40:43+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/micheladrianomedeiros.com.br\\\/blog\\\/programando-por-meio-de-exemplos-java-3\\\/\"},\"wordCount\":513,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/micheladrianomedeiros.com.br\\\/blog\\\/#\\\/schema\\\/person\\\/687a6d17428a0f0e040aefbd858ebc1e\"},\"image\":{\"@id\":\"https:\\\/\\\/micheladrianomedeiros.com.br\\\/blog\\\/programando-por-meio-de-exemplos-java-3\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/micheladrianomedeiros.com.br\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/07\\\/10711580.png\",\"articleSection\":[\"Java\"],\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/micheladrianomedeiros.com.br\\\/blog\\\/programando-por-meio-de-exemplos-java-3\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/micheladrianomedeiros.com.br\\\/blog\\\/programando-por-meio-de-exemplos-java-3\\\/\",\"url\":\"https:\\\/\\\/micheladrianomedeiros.com.br\\\/blog\\\/programando-por-meio-de-exemplos-java-3\\\/\",\"name\":\"Programando por Meio de Exemplos Java #3 - 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