{"id":1570,"date":"2026-06-12T10:45:02","date_gmt":"2026-06-12T02:45:02","guid":{"rendered":"https:\/\/yunyanglib.cn\/?p=1570"},"modified":"2026-06-12T10:45:04","modified_gmt":"2026-06-12T02:45:04","slug":"%e3%80%90java%e3%80%91arrays-%e5%b7%a5%e5%85%b7%e7%b1%bb%e5%85%a8%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=1570","title":{"rendered":"\u3010Java\u3011Arrays \u5de5\u5177\u7c7b\u5168\u89e3"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u54c8\u55bd\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\u3002\u65e5\u5e38\u5f00\u53d1\u4e2d\u6570\u7ec4\u64cd\u4f5c\u5341\u5206\u9891\u7e41\uff0cJava \u63d0\u4f9b\u4e86<code>java.util.Arrays<\/code>\u5de5\u5177\u7c7b\uff0c\u5c01\u88c5\u4e86\u6570\u7ec4\u590d\u5236\u3001\u6392\u5e8f\u3001\u67e5\u627e\u3001\u7c7b\u578b\u8f6c\u6362\u7b49\u5e38\u7528\u65b9\u6cd5\uff0c\u4e0d\u7528\u81ea\u5df1\u91cd\u590d\u9020\u8f6e\u5b50\u3002\u4eca\u5929\u7cfb\u7edf\u68b3\u7406\u4e00\u904d Arrays \u5e38\u7528 API\uff0c\u9644\u4e0a\u5b9e\u64cd\u4ee3\u7801\uff0c\u65b9\u4fbf\u65e5\u540e\u67e5\u9605\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u6570\u7ec4\u521b\u5efa\u4e0e\u586b\u5145<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. copyOf\uff1a\u6570\u7ec4\u62f7\u8d1d\uff0c\u53ef\u6269\u5bb9 \/ \u622a\u65ad<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>copyOf(\u539f\u6570\u7ec4,\u65b0\u957f\u5ea6)<\/code>\uff0c\u957f\u5ea6\u5927\u4e8e\u539f\u6570\u7ec4\u81ea\u52a8\u8865\u9ed8\u8ba4\u503c\uff0c\u5c0f\u4e8e\u539f\u6570\u7ec4\u505a\u622a\u65ad\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Arrays;\n\npublic class ArraysDemo {\n    public static void main(String&#91;] args) {\n        int&#91;] arr = {1,2,3,4};\n        \/\/ \u622a\u65ad\u6570\u7ec4\uff0c\u53ea\u4fdd\u7559\u524d2\u4f4d\n        int&#91;] arr1 = Arrays.copyOf(arr,2);\n        \/\/ \u6269\u5bb9\u6570\u7ec4\uff0c\u591a\u51fa\u4f4d\u7f6e\u8865int\u9ed8\u8ba4\u503c0\n        int&#91;] arr2 = Arrays.copyOf(arr,6);\n        System.out.println(Arrays.toString(arr1)); \/\/ &#91;1, 2]\n        System.out.println(Arrays.toString(arr2)); \/\/ &#91;1, 2, 3, 4, 0, 0]\n    }\n}\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. copyOfRange\uff1a\u533a\u95f4\u8303\u56f4\u62f7\u8d1d<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5de6\u95ed\u53f3\u5f00<code>[from,to)<\/code>\uff0c\u622a\u53d6\u6307\u5b9a\u4e0b\u6807\u533a\u95f4\u751f\u6210\u65b0\u6570\u7ec4\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] arr = {10,20,30,40,50};\n\/\/ \u4e0b\u68071~3\uff0c\u53d620\u300130\nint&#91;] rangeArr = Arrays.copyOfRange(arr,1,3);\nSystem.out.println(Arrays.toString(rangeArr)); \/\/ &#91;20, 30]\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. fill\uff1a\u6279\u91cf\u586b\u5145\u6570\u7ec4\u5143\u7d20<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u7edf\u4e00\u7ed9\u6570\u7ec4\u5168\u90e8 \/ \u6307\u5b9a\u533a\u95f4\u8d4b\u503c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] fillArr = new int&#91;5];\nArrays.fill(fillArr,9); \/\/ \u5168\u90e8\u586b\u51459\nSystem.out.println(Arrays.toString(fillArr)); \/\/ &#91;9, 9, 9, 9, 9]\nArrays.fill(fillArr,1,3,5); \/\/ \u4e0b\u68071\u30012\u586b\u51455\nSystem.out.println(Arrays.toString(fillArr)); \/\/ &#91;9, 5, 5, 9, 9]\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u6570\u7ec4\u76f8\u7b49\u5224\u65ad<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong><code>Arrays.equals()<\/code>\uff1a\u63a8\u8350\u4f7f\u7528<\/strong>\uff0c\u9010\u4e2a\u5143\u7d20\u5bf9\u6bd4\u5185\u5bb9\u662f\u5426\u4e00\u81f4\uff1b<\/li>\n\n\n\n<li><code>hashCode()<\/code>\u57fa\u4e8e\u6570\u7ec4\u5185\u5bb9\u751f\u6210\u54c8\u5e0c\u503c\uff0c\u4f46\u5b58\u5728\u54c8\u5e0c\u78b0\u649e\uff0c<strong>\u4e0d\u80fd\u5355\u72ec\u7528\u6765\u5224\u5b9a\u76f8\u7b49<\/strong>\uff0c\u4ec5\u53ef\u505a\u5feb\u901f\u9884\u6821\u9a8c\u3002<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] a = {1,2,3};\nint&#91;] b = {1,2,3};\nint&#91;] c = {1,3,2};\n\nSystem.out.println(Arrays.equals(a,b)); \/\/ true\nSystem.out.println(Arrays.equals(a,c)); \/\/ false\nSystem.out.println(Arrays.hashCode(a));\nSystem.out.println(Arrays.hashCode(b));\n<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u5c0f\u8d34\u58eb\uff1a\u53ea\u6709 equals \u8fd4\u56de true\uff0c\u6570\u7ec4\u5185\u5bb9\u624d\u4e00\u5b9a\u76f8\u540c\uff1bhashCode \u76f8\u540c\uff0c\u6570\u7ec4\u672a\u5fc5\u76f8\u7b49\u3002<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u6570\u7ec4\u6392\u5e8f sort ()<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Arrays.sort \u652f\u6301\u57fa\u672c\u6570\u636e\u7c7b\u578b\u3001\u5bf9\u8c61\u6570\u7ec4\u6392\u5e8f\uff0c\u57fa\u672c\u7c7b\u578b\u91c7\u7528\u53cc\u8f74\u5feb\u901f\u6392\u5e8f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] sortArr = {5,1,9,3,2};\nArrays.sort(sortArr);\nSystem.out.println(Arrays.toString(sortArr)); \/\/ &#91;1, 2, 3, 5, 9]\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u4e8c\u5206\u67e5\u627e binarySearch ()<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f<strong>\u524d\u63d0\uff1a\u6570\u7ec4\u5fc5\u987b\u63d0\u524d\u5347\u5e8f\u6392\u5e8f\uff0c\u5426\u5219\u7ed3\u679c\u4e0d\u53ef\u9760<\/strong>\uff0c\u627e\u5230\u8fd4\u56de\u4e0b\u6807\uff0c\u627e\u4e0d\u5230\u8fd4\u56de\u8d1f\u6570\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] searchArr = {1,2,3,4,5,6};\nint index = Arrays.binarySearch(searchArr,4);\nSystem.out.println(index); \/\/ 3\nint noFind = Arrays.binarySearch(searchArr,9);\nSystem.out.println(noFind); \/\/ \u8d1f\u6570\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u6570\u7ec4\u6d41\u8f6c Stream<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>Arrays.stream()<\/code>\u5c06\u6570\u7ec4\u8f6c\u4e3a\u6d41\uff0c\u501f\u52a9 Stream \u6d41\u5f0f\u7f16\u7a0b\u505a\u8fc7\u6ee4\u3001\u6c42\u548c\u7b49\u64cd\u4f5c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] streamArr = {1,2,3,4,5};\n\/\/ \u6c42\u548c\nint sum = Arrays.stream(streamArr).sum();\n\/\/ \u7b5b\u9009\u5927\u4e8e3\u7684\u5143\u7d20\nArrays.stream(streamArr).filter(num -&gt; num&gt;3).forEach(System.out::print);\nSystem.out.println(\"\\n\u603b\u548c\uff1a\"+sum);\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u6570\u7ec4\u6253\u5370 toString ()<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u76f4\u63a5\u6253\u5370\u6570\u7ec4\u53d8\u91cf\u8f93\u51fa\u5730\u5740\u54c8\u5e0c\u503c\uff0c<code>Arrays.toString<\/code>\u683c\u5f0f\u5316\u8f93\u51fa\u6570\u7ec4\u5185\u5bb9\uff0c\u5f00\u53d1\u8c03\u8bd5\u5fc5\u5907\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] printArr = {11,22,33};\nSystem.out.println(printArr); \/\/ &#91;I@xxxx \u5185\u5b58\u5730\u5740\nSystem.out.println(Arrays.toString(printArr)); \/\/ &#91;11, 22, 33]\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001\u6570\u7ec4\u8f6c List asList ()<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c06\u5305\u88c5\u7c7b\u6570\u7ec4\u8f6c\u4e3a List \u96c6\u5408\uff0c\u6ce8\u610f\uff1a\u57fa\u672c\u7c7b\u578b\u6570\u7ec4\u76f4\u63a5\u8f6c List \u4f1a\u628a\u6574\u4e2a\u6570\u7ec4\u5f53\u6210\u5355\u4e2a\u5143\u7d20\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u6b63\u786e\u5199\u6cd5\uff1aInteger\u5305\u88c5\u7c7b\u6570\u7ec4\nInteger&#91;] listArr = {1,2,3,4};\njava.util.List&lt;Integer&gt; list = Arrays.asList(listArr);\nSystem.out.println(list);\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u516b\u3001\u51fd\u6570\u5f0f\u586b\u5145 setAll<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java8 \u65b0\u589e\uff0c\u901a\u8fc7\u51fd\u6570\u8868\u8fbe\u5f0f\u52a8\u6001\u8d4b\u503c\u6570\u7ec4\u5143\u7d20\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] funcArr = new int&#91;5];\n\/\/ \u4e0b\u6807\u503c*2\u8d4b\u503c\nArrays.setAll(funcArr,i-&gt;i*2);\nSystem.out.println(Arrays.toString(funcArr)); \/\/ &#91;0, 2, 4, 6, 8]\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e5d\u3001parallelPrefix \u5e76\u884c\u7d2f\u79ef\u8fd0\u7b97<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e76\u884c\u904d\u5386\u6570\u7ec4\uff0c\u5f53\u524d\u5143\u7d20 = \u5f53\u524d\u503c\u548c\u524d\u4e00\u4f4d\u5143\u7d20\u8fd0\u7b97\u7ed3\u679c\uff0c\u8986\u76d6\u539f\u503c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] preArr = {1,2,3,4};\n\/\/ \u7d2f\u52a0\uff1a1,1+2=3,3+3=6,6+4=10\nArrays.parallelPrefix(preArr,(x,y)-&gt;x+y);\nSystem.out.println(Arrays.toString(preArr)); \/\/ &#91;1, 3, 6, 10]\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u603b\u7ed3<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Arrays \u662f\u6570\u7ec4\u5f00\u53d1\u9ad8\u9891\u5de5\u5177\u7c7b\uff0c\u8bb0\u4f4f\u51e0\u4e2a\u5173\u952e\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u590d\u5236\uff1a<code>copyOf\/copyOfRange<\/code>\uff1b\u586b\u5145\uff1a<code>fill\/setAll<\/code>\uff1b<\/li>\n\n\n\n<li>\u5224\u7b49\u4f18\u5148<code>equals<\/code>\uff0c\u614e\u7528 hashCode \u5355\u72ec\u5224\u7b49\uff1b<\/li>\n\n\n\n<li>\u4e8c\u5206\u67e5\u627e<code>binarySearch<\/code>\u5fc5\u987b\u5148\u6392\u5e8f\uff1b<\/li>\n\n\n\n<li>\u8c03\u8bd5\u6253\u5370\u56fa\u5b9a\u7528<code>toString<\/code>\u3002<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u54c8\u55bd\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\u3002\u65e5\u5e38\u5f00\u53d1\u4e2d\u6570\u7ec4\u64cd\u4f5c\u5341\u5206\u9891\u7e41\uff0cJava \u63d0\u4f9b\u4e86java.util.Arrays\u5de5\u5177\u7c7b\uff0c\u5c01\u88c5<\/p>\n<div class=\"more-link\">\n\t\t\t\t <a href=\"https:\/\/yunyanglib.cn\/?p=1570\" class=\"link-btn theme-btn\"><span>Read More <\/span> <i class=\"fa fa-caret-right\"><\/i><\/a>\n\t\t\t<\/div>\n","protected":false},"author":1,"featured_media":1571,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[15],"class_list":["post-1570","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-java"],"_links":{"self":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1570","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1570"}],"version-history":[{"count":5,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1570\/revisions"}],"predecessor-version":[{"id":1612,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1570\/revisions\/1612"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/media\/1571"}],"wp:attachment":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1570"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1570"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1570"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}