{"id":677,"date":"2020-01-27T12:02:56","date_gmt":"2020-01-27T15:02:56","guid":{"rendered":"https:\/\/micheladrianomedeiros.com.br\/blog\/?p=677"},"modified":"2020-01-27T12:02:58","modified_gmt":"2020-01-27T15:02:58","slug":"programando-por-meio-de-exemplos-java-2","status":"publish","type":"post","link":"https:\/\/micheladrianomedeiros.com.br\/blog\/programando-por-meio-de-exemplos-java-2\/","title":{"rendered":"Programando por Meio de Exemplos Java #2"},"content":{"rendered":"\n<p>No artigo anterior paramos no\ncomando \/reset, que limpa tudo que j\u00e1 digitamos no console. Depois fizemos o\ncomando \/list para ver se realmente n\u00e3o tinha limpado tudo.<\/p>\n\n\n\n<p>Por isso \u00e9 bom guardar os comandos\nem arquivos. Vamos abrir novamente o arquivo HeloWorld.java com o comando: \/open\nHeloWorld.java.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"520\" height=\"245\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/1open.png\" alt=\"\" class=\"wp-image-678\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/1open.png 520w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/1open-300x141.png 300w\" sizes=\"auto, (max-width: 520px) 100vw, 520px\" \/><\/figure><\/div>\n\n\n\n<p>Se voc\u00ea digitar o \/list ver\u00e1 cada\nlinha de c\u00f3digo desse arquivo. Temos a op\u00e7\u00e3o de editar apenas uma linha deste\nc\u00f3digo colocando a marca\u00e7\u00e3o \/edit.<\/p>\n\n\n\n<p>Vamos editar a linha um\ndigite: \/edit 1<\/p>\n\n\n\n<p>Vai abrir o editor do JShell para\npodermos editar a linha que digitamos.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"638\" height=\"503\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/2editorjshell.png\" alt=\"\" class=\"wp-image-679\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/2editorjshell.png 638w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/2editorjshell-300x237.png 300w\" sizes=\"auto, (max-width: 638px) 100vw, 638px\" \/><\/figure><\/div>\n\n\n\n<p>Vamos modificar o comando System.out.println\npara printf.<\/p>\n\n\n\n<p>printf(&#8220;Hello\nWorld!&#8221;);<\/p>\n\n\n\n<p>Clique em Accept e depois em Exit.\nSe voc\u00ea estiver utilizado o Java 9 voc\u00ea ir\u00e1 ver no console do jshell a execu\u00e7\u00e3o\nda linha editada, no caso a sa\u00edda ser\u00e1 o Hello World!.<\/p>\n\n\n\n<p>No meu caso estou utilizando o\nJava 13 e pesquisando vi que o m\u00e9todo printf foi removido, ent\u00e3o para mim ir\u00e1 aparecer\num erro quando eu clicar em Accept.<\/p>\n\n\n\n<p>Quando voc\u00ea clica em Accept a\nlinha editada \u00e9 executada e voc\u00ea pode ver o resultado no console do jshell.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"816\" height=\"455\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/3editorerro.png\" alt=\"\" class=\"wp-image-680\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/3editorerro.png 816w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/3editorerro-300x167.png 300w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/3editorerro-768x428.png 768w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/3editorerro-262x147.png 262w\" sizes=\"auto, (max-width: 816px) 100vw, 816px\" \/><\/figure><\/div>\n\n\n\n<p>O jshell j\u00e1 carrega algumas\nbibliotecas assim que inicia, por isso h\u00e1 comandos que voc\u00ea n\u00e3o precisar\u00e1\nimportar nenhuma biblioteca.<\/p>\n\n\n\n<p>Para ver as bibliotecas carregadas\nautomaticamente execute o comando: list -start.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"655\" height=\"531\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/4liststart.png\" alt=\"\" class=\"wp-image-681\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/4liststart.png 655w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/4liststart-300x243.png 300w\" sizes=\"auto, (max-width: 655px) 100vw, 655px\" \/><\/figure><\/div>\n\n\n\n<p>Veja esse mesmo comando para a\nvers\u00e3o do Java 9. Note que o printf estava presente.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"885\" height=\"225\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/5liststart9.png\" alt=\"\" class=\"wp-image-682\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/5liststart9.png 885w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/5liststart9-300x76.png 300w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/5liststart9-768x195.png 768w\" sizes=\"auto, (max-width: 885px) 100vw, 885px\" \/><\/figure><\/div>\n\n\n\n<p>Se voc\u00ea quiser listar todos os\ncomandos que voc\u00ea j\u00e1 executou mais as importa\u00e7\u00f5es fa\u00e7a o comando: \/list -all<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"742\" height=\"1024\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/6listall-742x1024.png\" alt=\"\" class=\"wp-image-683\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/6listall-742x1024.png 742w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/6listall-217x300.png 217w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/6listall-768x1060.png 768w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/6listall.png 791w\" sizes=\"auto, (max-width: 742px) 100vw, 742px\" \/><\/figure><\/div>\n\n\n\n<p>As linhas que s\u00e3o pr\u00e9-carregas\ns\u00e3o numeradas com o prefixo s. A linhas que tem o prefixo e, foram comandos que\napresentaram algum tipo de erro.<\/p>\n\n\n\n<p>Se voc\u00ea quiser executar um\ncomando desta lista basta executar o comando \/n onde n \u00e9 o identificador na\nlista.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"594\" height=\"192\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/7barra1.png\" alt=\"\" class=\"wp-image-684\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/7barra1.png 594w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/7barra1-300x97.png 300w\" sizes=\"auto, (max-width: 594px) 100vw, 594px\" \/><\/figure><\/div>\n\n\n\n<p>Voc\u00ea pode tamb\u00e9m executar o comando\npor exemplo, contando a posi\u00e7\u00e3o do \u00faltimo item da lista como refer\u00eancia. <\/p>\n\n\n\n<p>Digamos que eu queira executar\no e6. Ao inv\u00e9s de eu executar o comando \/e6 posso executar o comando \/-2.<\/p>\n\n\n\n<p>Para listar todas as vari\u00e1veis\nque voc\u00ea criou, voc\u00ea pode executar o comando \/vars.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"295\" height=\"155\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/8vars.png\" alt=\"\" class=\"wp-image-685\"\/><\/figure><\/div>\n\n\n\n<p>Se voc\u00ea quiser listar todas as\nclasses criadas, voc\u00ea pode executar o comando \/types. Note que eu criei uma\nclasse antes de listar as classes.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"267\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/9types.png\" alt=\"\" class=\"wp-image-686\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/9types.png 400w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/9types-300x200.png 300w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/figure><\/div>\n\n\n\n<p>Para listar todos os m\u00e9todos\ncriados, execute o comando \/methods.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"430\" height=\"158\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/10methods.png\" alt=\"\" class=\"wp-image-687\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/10methods.png 430w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/10methods-300x110.png 300w\" sizes=\"auto, (max-width: 430px) 100vw, 430px\" \/><\/figure><\/div>\n\n\n\n<p>Se voc\u00ea quiser ver todos os\ncomandos digitados no console digite o comando: \/history.<\/p>\n\n\n\n<p>Vimos que para limpar todos os\ncomandos executados no console digitamos \/reset. Mas h\u00e1 a op\u00e7\u00e3o de remover\napenas uma linha desejada com o comando \/drop n, onde n \u00e9 o identificador da\nlinha.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"730\" height=\"622\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/11drop.png\" alt=\"\" class=\"wp-image-688\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/11drop.png 730w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/11drop-300x256.png 300w\" sizes=\"auto, (max-width: 730px) 100vw, 730px\" \/><\/figure><\/div>\n\n\n\n<p>Voc\u00ea pode configurar um editor\npara abrir com o seguinte comando: \/set editor \u201ccaminho do arquivo\u201d. E depois\npara abrir este editor voc\u00ea digita: \/edit.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"886\" height=\"167\" src=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/12edit.png\" alt=\"\" class=\"wp-image-689\" srcset=\"https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/12edit.png 886w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/12edit-300x57.png 300w, https:\/\/micheladrianomedeiros.com.br\/blog\/wp-content\/uploads\/2020\/01\/12edit-768x145.png 768w\" sizes=\"auto, (max-width: 886px) 100vw, 886px\" \/><\/figure><\/div>\n\n\n\n<p>Digite o seguinte comando: <\/p>\n\n\n\n<p>void println(String message){System.out.println(message);}<\/p>\n\n\n\n<p>Agora salve este comando em um\narquivo: \/save sample.startup<\/p>\n\n\n\n<p>Digite o comando: \/set start\nsample.startup. Depois digite o comando \/reset.<\/p>\n\n\n\n<p>Se voc\u00ea digitar o comando \/list\n-all, voc\u00ea ver\u00e1 que n\u00e3o h\u00e1 mais aquelas importa\u00e7\u00f5es das bibliotecas. E por qu\u00ea?<\/p>\n\n\n\n<p>Quando criamos o arquivo\nsample.startup e depois executamos o comando set start, e em seguida executamos\no comando \/reset.<\/p>\n\n\n\n<p>Depois do reset o jshell n\u00e3o\nvai mais carregar os arquivos padr\u00f5es que carregava antes, porque dizemos ao\nsistema para carregar no lugar o arquivo sample.startup.<\/p>\n\n\n\n<p>Com isto voc\u00ea percebe que tem\na possibilidade de configurar do seu jeito o que o jshell vai carregar logo que\niniciar.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>No artigo anterior paramos no comando \/reset, que limpa tudo que j\u00e1 digitamos no console. Depois fizemos o comando \/list para ver se realmente n\u00e3o tinha limpado tudo. Por isso \u00e9 bom guardar os comandos em arquivos. Vamos abrir novamente o arquivo HeloWorld.java com o comando: \/open HeloWorld.java. Se voc\u00ea digitar o \/list ver\u00e1 cada [&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-677","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 v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Programando por Meio de Exemplos Java #2 - 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-2\/\" \/>\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 #2\" \/>\n<meta property=\"og:description\" content=\"No artigo anterior paramos no comando \/reset, que limpa tudo que j\u00e1 digitamos no console. Depois fizemos o comando \/list para ver se realmente n\u00e3o tinha limpado tudo. Por isso \u00e9 bom guardar os comandos em arquivos. Vamos abrir novamente o arquivo HeloWorld.java com o comando: \/open HeloWorld.java. 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