{"id":13588,"date":"2024-03-15T07:27:16","date_gmt":"2024-03-15T07:27:16","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-define-an-array-in-java-without-assigning-values\/"},"modified":"2025-08-05T20:38:05","modified_gmt":"2025-08-05T20:38:05","slug":"how-to-define-an-array-in-java-without-assigning-values","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-define-an-array-in-java-without-assigning-values\/","title":{"rendered":"Java Array Declaration Without Initialization"},"content":{"rendered":"<p>In Java, you can define an uninitialized array as follows:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u4e00\u4e2a\u6574\u6570\u6570\u7ec4<\/span>\r\n<span class=\"hljs-type\">int<\/span>[] myArray;\r\n\r\n<span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4<\/span>\r\nString[] myArray2;\r\n\r\n<span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u4e00\u4e2a\u81ea\u5b9a\u4e49\u5bf9\u8c61\u6570\u7ec4<\/span>\r\nMyObject[] myArray3;\r\n<\/code><\/pre>\n<p>Please note, this only defines an array variable without allocating memory space for it, so the array variable remains null. If you need to allocate memory space for the array, you can use the new keyword to create an array object.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-comment\">\/\/ \u521b\u5efa\u4e00\u4e2a\u957f\u5ea6\u4e3a10\u7684\u6574\u6570\u6570\u7ec4<\/span>\r\nmyArray = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">int<\/span>[<span class=\"hljs-number\">10<\/span>];\r\n\r\n<span class=\"hljs-comment\">\/\/ \u521b\u5efa\u4e00\u4e2a\u957f\u5ea6\u4e3a5\u7684\u5b57\u7b26\u4e32\u6570\u7ec4<\/span>\r\nmyArray2 = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">String<\/span>[<span class=\"hljs-number\">5<\/span>];\r\n\r\n<span class=\"hljs-comment\">\/\/ \u521b\u5efa\u4e00\u4e2a\u957f\u5ea6\u4e3a3\u7684\u81ea\u5b9a\u4e49\u5bf9\u8c61\u6570\u7ec4<\/span>\r\nmyArray3 = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">MyObject<\/span>[<span class=\"hljs-number\">3<\/span>];\r\n<\/code><\/pre>\n<p>When defining arrays, values can also be assigned directly.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u5e76\u521d\u59cb\u5316\u6574\u6570\u6570\u7ec4<\/span>\r\n<span class=\"hljs-type\">int<\/span>[] myArray4 = {<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">5<\/span>};\r\n\r\n<span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u5e76\u521d\u59cb\u5316\u5b57\u7b26\u4e32\u6570\u7ec4<\/span>\r\nString[] myArray5 = {<span class=\"hljs-string\">\"Hello\"<\/span>, <span class=\"hljs-string\">\"World\"<\/span>};\r\n\r\n<span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u5e76\u521d\u59cb\u5316\u81ea\u5b9a\u4e49\u5bf9\u8c61\u6570\u7ec4<\/span>\r\nMyObject[] myArray6 = {<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">MyObject<\/span>(), <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">MyObject<\/span>()};\r\n<\/code><\/pre>\n<p>It is important to note that the length of an array cannot be changed. Once the length of an array is defined, it cannot be altered.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Java, you can define an uninitialized array as follows: \/\/ \u5b9a\u4e49\u4e00\u4e2a\u6574\u6570\u6570\u7ec4 int[] myArray; \/\/ \u5b9a\u4e49\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4 String[] myArray2; \/\/ \u5b9a\u4e49\u4e00\u4e2a\u81ea\u5b9a\u4e49\u5bf9\u8c61\u6570\u7ec4 MyObject[] myArray3; Please note, this only defines an array variable without allocating memory space for it, so the array variable remains null. If you need to allocate memory space for the array, you can use [&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":[5783,3437,1572,8979,585],"class_list":["post-13588","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-array-declaration","tag-java-arrays","tag-java-initialization","tag-java-variables","tag-programming-basics"],"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 Array Declaration Without Initialization - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to declare Java arrays without assigning values. 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