{"id":23147,"date":"2024-03-16T00:53:17","date_gmt":"2024-03-16T00:53:17","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-filter-and-return-objects-in-java-stream\/"},"modified":"2024-03-22T00:34:23","modified_gmt":"2024-03-22T00:34:23","slug":"how-to-filter-and-return-objects-in-java-stream","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-filter-and-return-objects-in-java-stream\/","title":{"rendered":"How to filter and return objects in Java stream?"},"content":{"rendered":"<p>In Java, you can use Stream to filter and return objects. Here is an example:<\/p>\n<p>Assuming we have a list containing Person objects, we want to filter out people over the age of 18 based on a certain condition. We can use the filter() method to filter the list, and then use the collect() method to collect the filtered results into a new list.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.util.ArrayList;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.List;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.stream.Collectors;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Example<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        List&lt;Person&gt; personList = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ArrayList<\/span>&lt;&gt;();\r\n        personList.add(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Person<\/span>(<span class=\"hljs-string\">\"Alice\"<\/span>, <span class=\"hljs-number\">20<\/span>));\r\n        personList.add(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Person<\/span>(<span class=\"hljs-string\">\"Bob\"<\/span>, <span class=\"hljs-number\">25<\/span>));\r\n        personList.add(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Person<\/span>(<span class=\"hljs-string\">\"Charlie\"<\/span>, <span class=\"hljs-number\">17<\/span>));\r\n\r\n        List&lt;Person&gt; filteredList = personList.stream()\r\n                .filter(person -&gt; person.getAge() &gt; <span class=\"hljs-number\">18<\/span>)\r\n                .collect(Collectors.toList());\r\n\r\n        <span class=\"hljs-keyword\">for<\/span> (Person person : filteredList) {\r\n            System.out.println(person.getName() + <span class=\"hljs-string\">\" - \"<\/span> + person.getAge());\r\n        }\r\n    }\r\n}\r\n\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Person<\/span> {\r\n    <span class=\"hljs-keyword\">private<\/span> String name;\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-type\">int<\/span> age;\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title function_\">Person<\/span><span class=\"hljs-params\">(String name, <span class=\"hljs-type\">int<\/span> age)<\/span> {\r\n        <span class=\"hljs-built_in\">this<\/span>.name = name;\r\n        <span class=\"hljs-built_in\">this<\/span>.age = age;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> String <span class=\"hljs-title function_\">getName<\/span><span class=\"hljs-params\">()<\/span> {\r\n        <span class=\"hljs-keyword\">return<\/span> name;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">getAge<\/span><span class=\"hljs-params\">()<\/span> {\r\n        <span class=\"hljs-keyword\">return<\/span> age;\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>In the example above, a list containing Person objects is first created. The list is then converted into a stream using the stream() method. Next, a Lambda expression is passed into the filter() method to filter out individuals over 18 years old. Finally, the collect() method is used to gather the filtered results into a new list.<\/p>\n<p>Finally, use a for loop to iterate through the new list and output the name and age of each person. Running the above code will yield the following output:<\/p>\n<pre class=\"post-pre\"><code>Alice - 20\r\nBob - 25\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>In Java, you can use Stream to filter and return objects. Here is an example: Assuming we have a list containing Person objects, we want to filter out people over the age of 18 based on a certain condition. We can use the filter() method to filter the list, and then use the collect() method [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-23147","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to filter and return objects in Java stream? - Blog - Silicon Cloud<\/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:\/\/www.silicloud.com\/blog\/how-to-filter-and-return-objects-in-java-stream\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to filter and return objects in Java stream?\" \/>\n<meta property=\"og:description\" content=\"In Java, you can use Stream to filter and return objects. 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