{"id":204,"date":"2023-11-26T21:29:27","date_gmt":"2023-11-27T00:29:27","guid":{"rendered":"https:\/\/urutaudev.com.br\/?p=204"},"modified":"2024-02-05T23:49:06","modified_gmt":"2024-02-06T02:49:06","slug":"como-incrementar-valor-em-map-no-java","status":"publish","type":"post","link":"https:\/\/urutaudev.com.br\/index.php\/2023\/11\/26\/como-incrementar-valor-em-map-no-java\/","title":{"rendered":"Como incrementar valor em Map no Java"},"content":{"rendered":"<h2><span style=\"font-family: 'arial black', sans-serif;\">Neste tutorial mostro como incrementar um valor em um Map no <a href=\"https:\/\/urutaudev.com.br\/index.php\/category\/tutorias\/java\/\">Java<\/a>.<\/span><\/h2>\n<hr \/>\n<p>&nbsp;<\/p>\n<h2>Introdu\u00e7\u00e3o<\/h2>\n<p><span style=\"font-size: 14pt;\">Neste tutorial irei demonstrar como incrementar um valor\u00a0 em Map no Java. <\/span><\/p>\n<p><span style=\"font-size: 14pt;\">O intuito deste tutorial e demonstrar de uma forma simples e pr\u00e1tica como podemos somar um valor a um Map j\u00e1 existente.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Para a demonstra\u00e7\u00e3o deste tutorial vamos utilizar o m\u00e9todo (<code>merge<\/code>) da Classe Map do <a href=\"https:\/\/urutaudev.com.br\/index.php\/category\/tutorias\/java\/\">Java<\/a>.<\/span><\/p>\n<h4><\/h4>\n<h2>Como incrementar valor em Map no Java<\/h2>\n<p><span style=\"font-size: 14pt;\">Vamos iniciar a codifica\u00e7\u00e3o do nosso exemplo, para executar este tutorial vamos criar uma Classe chamada\u00a0 <code>IncrementarValorMap<\/code> com o m\u00e9todo <code>main<\/code> respons\u00e1vel por iniciar no projeto.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Dentro do m\u00e9todo <code>main<\/code>\u00a0vamos criar uma vari\u00e1vel do tipo Map chamada <code>hasMap<\/code> e instanci\u00e1-la, a vari\u00e1vel que acabamos de criar ter\u00e1 como chave o tipo String e o valor ser\u00e1 do tipo\u00a0 Integer, ficando desta forma <code>Map&lt;String, Integer&gt; hasMap<\/code>.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Ap\u00f3s definirmos a nossa vari\u00e1vel do tipo Map, vamos inserir um valor a este Map, para adicionarmos uma valor ao Map utilizamos o m\u00e9todo (put) disponibilizado pela classe. <\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Sendo que devemos passar como par\u00e2metros o \u00edndice a qual queremos modificar e o valor\u00a0 \u00a0a ser atribu\u00eddo a este \u00edndice;<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">No nosso exemplo vamos adicionar o valor um (<strong>1<\/strong>) para o \u00edndice (<strong>A<\/strong>) da nossa vari\u00e1vel <code>hasMap<\/code>, o c\u00f3digo que vamos utilizar ficara desta forma:<\/span><\/p>\n<p><span style=\"font-size: 14pt;\"> <code>hasMap.put(\"A\", 1);<\/code>.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 14pt;\">Note que em nenhum momento desde o inicio hav\u00edamos definido o \u00edndice (<strong>A<\/strong>). <\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Isso por que o m\u00e9todo (<code>put<\/code>) al\u00e9m de alterar o valor de um \u00edndice no Map ele serve para criar esse \u00edndice caso ele n\u00e3o exista.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Ap\u00f3s inserimos um valor inicial ao nosso <strong>Map<\/strong>, vamos incrementar o valor contido no nosso \u00edndice, para isso vamos utilizar o m\u00e9todo (<code>merge<\/code>) presente na classe <strong>Map<\/strong>.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Para o nosso exemplo vamos incrementar o valor contido no indice (A) com o valor um (1), com o auxilio da fun\u00e7\u00e3o (<code>sum<\/code>) da classe <strong>Integer<\/strong> o nosso c\u00f3digo ficara desta forma.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\"><code>hasMap.merge(\"A\", 1, Integer::sum);<\/code><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 14pt;\">Pronto com nossa logica montada j\u00e1 podemos executar o nosso c\u00f3digo ao rodar voc\u00ea ver\u00e1 que o nosso <strong>Map<\/strong> come\u00e7a com o valor 1 e \u00e9 incrementado para o valor 2 logo ap\u00f3s usarmos o m\u00e9todo (<code>merge<\/code>).<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Logo abaixo mostro todo o c\u00f3digo utilizado neste tutorial:<\/span><\/p>\n<p>&nbsp;<\/p>\n<div>\n<pre>import java.util.HashMap;\r\nimport java.util.Map;\r\n\r\npublic class IncrementarValorMap {\r\n\r\n\u00a0 \u00a0 public static void main(String[] args) {\r\n\r\n  \u00a0 \u00a0 \u00a0 Map&lt;String, Integer&gt; hasMap = new HashMap&lt;&gt;();  \r\n\u00a0 \u00a0 \u00a0 \u00a0 hasMap.put(\"A\", 1);\r\n\r\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(hasMap);\r\n\r\n  \u00a0 \u00a0 \u00a0 hasMap.merge(\"A\", 1, Integer::sum);\r\n  \u00a0 \u00a0 \u00a0 hasMap.merge(\"B\", 1, Integer::sum);\r\n\u00a0 \u00a0 \u00a0 \u00a0 hasMap.merge(\"A\", 1, Integer::sum);\r\n\r\n  \u00a0 \u00a0 \u00a0 System.out.println(hasMap); \u00a0\r\n  \u00a0\r\n\u00a0 \u00a0 }\r\n\r\n}<\/pre>\n<\/div>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 14pt;\">Segue abaixo um pequeno v\u00eddeo explicativo da implementa\u00e7\u00e3o realizada neste tutorial:<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" title=\"D\u00favidas de iniciante Java  | incrementar valor de map #dicas #java\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/0JaFf-u9oGc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe><\/p>\n<h4><\/h4>\n<h3>C\u00f3digo fonte do tutorial:<\/h3>\n<p><a href=\"https:\/\/github.com\/JrDevCJ\/java-tutorial\/blob\/main\/Utils\/IncrementarValorMap.java\" target=\"_blank\" rel=\"noopener\">C\u00f3digo Fonte<\/a><\/p>\n<h3><\/h3>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Neste tutorial mostro como incrementar um valor em um Map no Java. &nbsp; Introdu\u00e7\u00e3o Neste tutorial irei demonstrar como incrementar<\/p>\n","protected":false},"author":1,"featured_media":166,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[13],"tags":[43,44,22,42,30,40,21,18],"class_list":["post-204","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-hashmap","tag-incrementar-map","tag-java","tag-map","tag-maven","tag-number","tag-spring","tag-tutorias"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Como incrementar valor em Map no Java - UrutauDev<\/title>\n<meta name=\"description\" content=\"Este em um pequeno exemplo de como podemos incrementar(somar) um valor em\u00a0 um Map no Java, usando o m\u00e9todo(merge) da classe Map.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/urutaudev.com.br\/index.php\/2023\/11\/26\/como-incrementar-valor-em-map-no-java\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como incrementar valor em Map no Java - UrutauDev\" \/>\n<meta property=\"og:description\" content=\"Este em um pequeno exemplo de como podemos incrementar(somar) um valor em\u00a0 um Map no Java, usando o m\u00e9todo(merge) da classe Map.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/urutaudev.com.br\/index.php\/2023\/11\/26\/como-incrementar-valor-em-map-no-java\/\" \/>\n<meta property=\"og:site_name\" content=\"UrutauDev\" \/>\n<meta property=\"article:published_time\" content=\"2023-11-27T00:29:27+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-02-06T02:49:06+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/urutaudev.com.br\/wp-content\/uploads\/2023\/09\/logo-java.png\" \/>\n\t<meta property=\"og:image:width\" content=\"300\" \/>\n\t<meta property=\"og:image:height\" content=\"200\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"C. 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