{"id":12949,"date":"2024-03-15T01:40:52","date_gmt":"2024-03-15T01:40:52","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-are-constants-defined-and-used-in-java\/"},"modified":"2025-08-05T09:10:08","modified_gmt":"2025-08-05T09:10:08","slug":"how-are-constants-defined-and-used-in-java","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-are-constants-defined-and-used-in-java\/","title":{"rendered":"Java Constants: Definition &#038; Usage"},"content":{"rendered":"<p>In Java, constants are values that do not change during the program&#8217;s execution. The definition and usage of constants are as follows:<\/p>\n<ol>\n<li>last<\/li>\n<li>concluding<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">MAX_VALUE<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">100<\/span>;\r\n<span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">MESSAGE<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"Hello\"<\/span>;\r\n<\/code><\/pre>\n<p>Please note that for constant reference types, only the reference itself is guaranteed to remain constant, not the content of the referenced object.<\/p>\n<ol>\n<li>The standard naming convention for constants. According to Java&#8217;s naming convention, constants are typically written in all uppercase letters and separated by underscores. For example:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">MAX_VALUE<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">100<\/span>;\r\n<span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">ERROR_MESSAGE<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"An error occurred\"<\/span>;\r\n<\/code><\/pre>\n<ol>\n<li>The use of constants. Constants can be directly used in the program without the need for assignment operations. For example:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">MAX_VALUE<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">100<\/span>;\r\nSystem.out.println(MAX_VALUE);  <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\uff1a100<\/span>\r\n<\/code><\/pre>\n<p>It is important to note that once a constant is defined, its value cannot be changed. Attempting to modify the value of a constant will result in a compilation error. For example:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">MAX_VALUE<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">100<\/span>;\r\nMAX_VALUE = <span class=\"hljs-number\">200<\/span>;  <span class=\"hljs-comment\">\/\/ \u7f16\u8bd1\u9519\u8bef\uff1a\u65e0\u6cd5\u4e3a\u6700\u7ec8\u53d8\u91cfMAX_VALUE\u5206\u914d\u503c<\/span>\r\n<\/code><\/pre>\n<p>In summary, the definition and usage of Java constants involve using the &#8216;final&#8217; keyword to declare variables and naming them following conventions. Once a constant is defined, its value cannot be changed.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Java, constants are values that do not change during the program&#8217;s execution. The definition and usage of constants are as follows: last concluding final int MAX_VALUE = 100; final String MESSAGE = &#8220;Hello&#8221;; Please note that for constant reference types, only the reference itself is guaranteed to remain constant, not the content of the [&hellip;]<\/p>\n","protected":false},"author":14,"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":[9293,6675,9292,4516,180],"class_list":["post-12949","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-final-keyword","tag-java-basics","tag-java-constants","tag-java-naming-conventions","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>Java Constants: Definition &amp; Usage - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to define Java constants using &#039;final&#039; keyword. 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