{"id":6696,"date":"2018-02-17T15:58:59","date_gmt":"2018-02-17T08:58:59","guid":{"rendered":"https:\/\/huongdanjava.com\/?p=6696"},"modified":"2021-01-05T06:23:56","modified_gmt":"2021-01-04T23:23:56","slug":"flatmap-method-of-optional-object-in-java","status":"publish","type":"post","link":"https:\/\/huongdanjava.com\/flatmap-method-of-optional-object-in-java.html","title":{"rendered":"flatMap() method of Optional object in Java"},"content":{"rendered":"<p>As you all know, the Optional object is a generic object, its data type can be any object, and therefore, we can meet the case that its data type is also an Optional object, such as: Optional&lt;Optional&lt;String&gt;&gt;. To resolve this problem, Java introduces us to the flatMap() method so that Optional&#8217;s data type is simpler: Optional&lt;String&gt; for example.<\/p>\n<p>For example, I have the following method:<\/p>\n<pre class=\"lang:java decode:true\">public String findName() {\r\n    \/\/ Do something\r\n    return null;\r\n}<\/pre>\n<p>To avoid the Null Pointer Exception, I will rewrite the above method with Optional object:<\/p>\n<pre class=\"lang:java decode:true\">public Optional&lt;String&gt; findName() {\r\n    \/\/ Do something\r\n    return Optional.empty();\r\n}<\/pre>\n<p>Now, if you use the above method with the <a href=\"https:\/\/huongdanjava.com\/map-method-optional-object-java.html\" target=\"_blank\" rel=\"noopener noreferrer\">map() method in the Optional object<\/a>:<\/p>\n<pre class=\"lang:java decode:true\">package com.huongdanjava.javaexample;\r\n\r\nimport java.util.Optional;\r\n\r\npublic class Example {\r\n\r\n\tpublic Optional&lt;String&gt; findName() {\r\n\t    \/\/ Do something\r\n\t    return Optional.empty();\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tExample e = new Example();\r\n\t\tOptional&lt;Example&gt; opt = Optional.ofNullable(e);\r\n\t\tSystem.out.println(opt.map(x -&gt; x.findName()));\r\n\t}\r\n\r\n}\r\n<\/pre>\n<p>The return value of the map() method will be:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6698 size-full\" src=\"https:\/\/huongdanjava.com\/wp-content\/uploads\/2018\/02\/flatmap-method-of-optional-object-in-java-1.png\" alt=\"flatMap() method of Optional object in Java\" width=\"700\" height=\"637\" \/><\/p>\n<p>As you can see, here the return result is an Optional object of the Optional object.<\/p>\n<p>If we now use the flatMap() method instead of the map() method:<\/p>\n<pre class=\"lang:java decode:true \">package com.huongdanjava.javaexample;\r\n\r\nimport java.util.Optional;\r\n\r\npublic class Example {\r\n\r\n\tpublic Optional&lt;String&gt; findName() {\r\n\t    \/\/ Do something\r\n\t    return Optional.empty();\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tExample e = new Example();\r\n\t\tOptional&lt;Example&gt; opt = Optional.ofNullable(e);\r\n\t\tSystem.out.println(opt.flatMap(x -&gt; x.findName()));\r\n\t}\r\n\r\n}\r\n<\/pre>\n<p>then the return value type will be much simpler:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6699 size-full\" src=\"https:\/\/huongdanjava.com\/wp-content\/uploads\/2018\/02\/flatmap-method-of-optional-object-in-java-2.png\" alt=\"flatMap() method of Optional object in Java\" width=\"700\" height=\"593\" \/><\/p>\n<p>&nbsp;<\/p>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-right kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;right&quot;,&quot;id&quot;:&quot;6696&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;1&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;5&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;4&quot;,&quot;greet&quot;:&quot;&quot;,&quot;legend&quot;:&quot;5\\\/5 - (1 vote)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;flatMap() method of Optional object in Java&quot;,&quot;width&quot;:&quot;138&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 138px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 4px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            5\/5 - (1 vote)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>As you all know, the Optional object is a generic object, its data type can be any object, and therefore, we can meet the case that its data type is also an Optional object, such as: Optional&lt;Optional&lt;String&gt;&gt;. To resolve this problem, Java introduces us to&hellip; <a href=\"https:\/\/huongdanjava.com\/flatmap-method-of-optional-object-in-java.html\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":411,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[269],"tags":[694],"class_list":["post-6696","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-basic","tag-java-optional-en","clearfix"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>flatMap() method of Optional object in Java - Huong Dan Java<\/title>\n<meta name=\"description\" content=\"In this tutorial, I will introduce with you all about flatMap() method of Optional object in Java.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/huongdanjava.com\/flatmap-method-of-optional-object-in-java.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"flatMap() method of Optional object in Java - Huong Dan Java\" \/>\n<meta property=\"og:description\" content=\"In this tutorial, I will introduce with you all about flatMap() method of Optional object in Java.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/huongdanjava.com\/flatmap-method-of-optional-object-in-java.html\" \/>\n<meta property=\"og:site_name\" content=\"Huong Dan Java\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/nhkhanh2406\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/nhkhanh2406\" \/>\n<meta property=\"article:published_time\" content=\"2018-02-17T08:58:59+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-01-04T23:23:56+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/huongdanjava.com\/wp-content\/uploads\/2016\/05\/java.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"620\" \/>\n\t<meta property=\"og:image:height\" content=\"349\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Khanh Nguyen\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@https:\/\/twitter.com\/KhanhNguyenJ\" \/>\n<meta name=\"twitter:site\" content=\"@KhanhNguyenJ\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Khanh Nguyen\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/flatmap-method-of-optional-object-in-java.html#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/flatmap-method-of-optional-object-in-java.html\"},\"author\":{\"name\":\"Khanh Nguyen\",\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/#\\\/schema\\\/person\\\/dc859d7f8cbea3b593e6738de9cbb82d\"},\"headline\":\"flatMap() method of Optional object in Java\",\"datePublished\":\"2018-02-17T08:58:59+00:00\",\"dateModified\":\"2021-01-04T23:23:56+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/flatmap-method-of-optional-object-in-java.html\"},\"wordCount\":158,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/#\\\/schema\\\/person\\\/dc859d7f8cbea3b593e6738de9cbb82d\"},\"image\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/flatmap-method-of-optional-object-in-java.html#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/huongdanjava.com\\\/wp-content\\\/uploads\\\/2016\\\/05\\\/java.jpg\",\"keywords\":[\"Java Optional\"],\"articleSection\":[\"Java Basic\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/huongdanjava.com\\\/flatmap-method-of-optional-object-in-java.html#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/flatmap-method-of-optional-object-in-java.html\",\"url\":\"https:\\\/\\\/huongdanjava.com\\\/flatmap-method-of-optional-object-in-java.html\",\"name\":\"flatMap() method of Optional object in Java - 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