{"id":13881,"date":"2024-03-15T08:03:28","date_gmt":"2024-03-15T08:03:28","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-create-a-hashmap-collection-in-java\/"},"modified":"2025-08-06T00:42:18","modified_gmt":"2025-08-06T00:42:18","slug":"how-to-create-a-hashmap-collection-in-java","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-create-a-hashmap-collection-in-java\/","title":{"rendered":"How to Create a HashMap in Java?"},"content":{"rendered":"<p>In Java, you can create a HashMap collection using the following code:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.util.HashMap;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Main<\/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        <span class=\"hljs-comment\">\/\/ \u521b\u5efaHashMap\u96c6\u5408<\/span>\r\n        HashMap&lt;String, Integer&gt; hashMap = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">HashMap<\/span>&lt;&gt;();\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u6dfb\u52a0\u5143\u7d20\u5230HashMap\u96c6\u5408<\/span>\r\n        hashMap.put(<span class=\"hljs-string\">\"A\"<\/span>, <span class=\"hljs-number\">1<\/span>);\r\n        hashMap.put(<span class=\"hljs-string\">\"B\"<\/span>, <span class=\"hljs-number\">2<\/span>);\r\n        hashMap.put(<span class=\"hljs-string\">\"C\"<\/span>, <span class=\"hljs-number\">3<\/span>);\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u6253\u5370HashMap\u96c6\u5408<\/span>\r\n        System.out.println(hashMap);\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>In the above code, the java.util.HashMap class is imported first. Then, a HashMap collection named &#8216;hashMap&#8217; is created in the main method. Key-value pairs are added to the HashMap collection using the put method. Finally, by printing the HashMap collection, the elements in the collection can be seen.<\/p>\n<p>Note that when creating a HashMap collection, you can specify the types of the keys and values. In the above code, a HashMap<String, Integer> was used to create a collection with keys of type String and values of type Integer.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Java, you can create a HashMap collection using the following code: import java.util.HashMap; public class Main { public static void main(String[] args) { \/\/ \u521b\u5efaHashMap\u96c6\u5408 HashMap&lt;String, Integer&gt; hashMap = new HashMap&lt;&gt;(); \/\/ \u6dfb\u52a0\u5143\u7d20\u5230HashMap\u96c6\u5408 hashMap.put(&#8220;A&#8221;, 1); hashMap.put(&#8220;B&#8221;, 2); hashMap.put(&#8220;C&#8221;, 3); \/\/ \u6253\u5370HashMap\u96c6\u5408 System.out.println(hashMap); } } In the above code, the java.util.HashMap class is imported first. [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[18660,3656,578,3654,180],"class_list":["post-13881","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-hashmap-example","tag-hashmap-tutorial","tag-java-collections","tag-java-hashmap","tag-java-programming"],"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 Create a HashMap in Java? - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn to create a HashMap in Java with step-by-step code examples. 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