{"id":64214,"date":"2025-05-03T11:08:31","date_gmt":"2025-05-03T03:08:31","guid":{"rendered":"https:\/\/fwq.ai\/blog\/64214\/"},"modified":"2025-05-03T11:08:31","modified_gmt":"2025-05-03T03:08:31","slug":"java%e6%80%8e%e4%b9%88%e5%88%a0%e9%99%a4%e6%95%b0%e7%bb%84%e9%bb%98%e8%ae%a4%e5%80%bc-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/64214\/","title":{"rendered":"Java\u600e\u4e48\u5220\u9664\u6570\u7ec4\u9ed8\u8ba4\u503c"},"content":{"rendered":"<blockquote><p>\n  java \u6570\u7ec4\u9ed8\u8ba4\u503c\u7684\u5220\u9664\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528\u586b\u5145\u5b57\u7b26\u3001\u91cd\u65b0\u5206\u914d\u5143\u7d20\u3001stream() \u548c map()\u3001\u81ea\u5b9a\u4e49\u65b9\u6cd5\u3002\u5176\u4e2d\u53ef\u4f7f\u7528 arrays.fill() \u586b\u5145\u6570\u7ec4\uff0c\u9010\u4e2a\u91cd\u65b0\u5206\u914d\u5f15\u7528\u7c7b\u578b\u5143\u7d20\u7684\u503c\uff0c\u6216\u4f7f\u7528 stream() \u548c map() \u66ff\u6362\u7279\u5b9a\u9ed8\u8ba4\u503c\u3002\u53e6\u5916\uff0c\u8fd8\u53ef\u4ee5\u521b\u5efa\u81ea\u5b9a\u4e49\u65b9\u6cd5\u6765\u5220\u9664\u6570\u7ec4\u4e2d\u7684\u9ed8\u8ba4\u503c\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/02\/2024110218461741730.jpg\" class=\"aligncenter\" title=\"Java\u600e\u4e48\u5220\u9664\u6570\u7ec4\u9ed8\u8ba4\u503c\u63d2\u56fe\" alt=\"Java\u600e\u4e48\u5220\u9664\u6570\u7ec4\u9ed8\u8ba4\u503c\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u5220\u9664 Java \u6570\u7ec4\u7684\u9ed8\u8ba4\u503c<\/strong><\/p>\n<p>Java \u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u9ed8\u8ba4\u503c\u53d6\u51b3\u4e8e\u6570\u7ec4\u5143\u7d20\u7684\u6570\u636e\u7c7b\u578b\uff1a<\/p>\n<ul>\n<li> <strong>\u57fa\u672c\u7c7b\u578b<\/strong>\uff08\u5982 int\u3001double\u3001boolean\uff09\uff1a\u9ed8\u8ba4\u503c\u4e3a 0\u30010.0\u3001false<\/li>\n<li> <strong>\u5f15\u7528\u7c7b\u578b<\/strong>\uff08\u5982 String\u3001Object\uff09\uff1a\u9ed8\u8ba4\u503c\u4e3a null<\/li>\n<\/ul>\n<p>\u8981\u5220\u9664 Java \u6570\u7ec4\u7684\u9ed8\u8ba4\u503c\uff0c\u6709\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6cd5\uff1a<\/p>\n<p><strong>\u4f7f\u7528\u586b\u5145\u5b57\u7b26\u6216\u6570\u5b57<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528 Arrays.fill() \u65b9\u6cd5\u7528\u5176\u4ed6\u503c\uff08\u5982 0\u3001&#8221;&#8221;\uff09\u586b\u5145\u6570\u7ec4\u3002<\/p>\n<pre>int[] arr = new int[5];\nArrays.fill(arr, 10); \/\/ \u7528 10 \u586b\u5145\u6240\u6709\u5143\u7d20<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u91cd\u65b0\u5206\u914d\u6570\u7ec4\u5143\u7d20<\/strong><\/p>\n<p>\u5bf9\u4e8e\u5f15\u7528\u7c7b\u578b\uff0c\u53ef\u4ee5\u9010\u4e2a\u91cd\u65b0\u5206\u914d\u6570\u7ec4\u5143\u7d20\u7684\u503c\u3002<\/p>\n<pre>String[] arr = new String[5];\nfor (int i = 0; i &lt; arr.length; i++) {\n    arr[i] = \"\"; \/\/ \u5c06\u6240\u6709\u5143\u7d20\u5206\u914d\u4e3a\u7a7a\u5b57\u7b26\u4e32\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u4f7f\u7528 stream() \u548c map()<\/strong><\/p>\n<p>Java 8 \u53ca\u66f4\u9ad8\u7248\u672c\u53ef\u4ee5\u4f7f\u7528 stream() \u548c map() \u65b9\u6cd5\u6765\u5220\u9664\u6570\u7ec4\u7684\u9ed8\u8ba4\u503c\u3002<\/p>\n<pre>int[] arr = new int[5];\nint[] modified = Arrays.stream(arr)\n    .map(i -&gt; i == 0 ? 1 : i) \/\/ \u5982\u679c\u503c\u4e3a 0\uff0c\u5219\u66ff\u6362\u4e3a 1\n    .toArray();<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u81ea\u5b9a\u4e49\u65b9\u6cd5<\/strong><\/p>\n<p>\u8fd8\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u81ea\u5b9a\u4e49\u65b9\u6cd5\u6765\u5220\u9664\u6570\u7ec4\u4e2d\u7684\u9ed8\u8ba4\u503c\u3002<\/p>\n<pre>public static &lt;T&gt; T[] removeDefaults(T[] arr, T defaultValue) {\n    List&lt;T&gt; list = new ArrayList&lt;&gt;(Arrays.asList(arr));\n    list.removeAll(Collections.singleton(defaultValue));\n    return list.toArray(arr);\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u793a\u4f8b\u7528\u6cd5<\/strong><\/p>\n<pre>int[] arr = new int[5];\narr = removeDefaults(arr, 0); \/\/ \u5220\u9664\u6240\u6709 0 \u5143\u7d20<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fJava\u600e\u4e48\u5220\u9664\u6570\u7ec4\u9ed8\u8ba4\u503c\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>java \u6570\u7ec4\u9ed8\u8ba4\u503c\u7684\u5220\u9664\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528\u586b\u5145\u5b57\u7b26\u3001\u91cd\u65b0\u5206\u914d\u5143\u7d20\u3001stream() \u548c map()\u3001\u81ea\u5b9a\u4e49\u65b9\u6cd5\u3002\u5176\u4e2d\u53ef\u4f7f\u7528 arrays.fill() \u586b\u5145\u6570\u7ec4\uff0c\u9010\u4e2a\u91cd\u65b0\u5206\u914d\u5f15\u7528\u7c7b\u578b\u5143\u7d20\u7684\u503c\uff0c\u6216\u4f7f\u7528 stream() \u548c map() \u66ff\u6362\u7279\u5b9a\u9ed8\u8ba4\u503c\u3002\u53e6\u5916\uff0c\u8fd8\u53ef\u4ee5\u521b\u5efa\u81ea\u5b9a\u4e49\u65b9\u6cd5\u6765\u5220\u9664\u6570\u7ec4\u4e2d\u7684\u9ed8\u8ba4\u503c\u3002 \u5982\u4f55\u5220\u9664 Java \u6570\u7ec4\u7684\u9ed8\u8ba4\u503c Java \u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u9ed8\u8ba4\u503c\u53d6\u51b3\u4e8e\u6570\u7ec4\u5143\u7d20\u7684\u6570\u636e\u7c7b\u578b\uff1a \u57fa\u672c\u7c7b\u578b\uff08\u5982 int\u3001double\u3001boolean\uff09\uff1a\u9ed8\u8ba4\u503c\u4e3a 0\u30010.0\u3001false \u5f15\u7528\u7c7b\u578b\uff08\u5982 String\u3001Object\uff09\uff1a\u9ed8\u8ba4\u503c\u4e3a null \u8981\u5220\u9664 Java \u6570\u7ec4\u7684\u9ed8\u8ba4\u503c\uff0c\u6709\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6cd5\uff1a \u4f7f\u7528\u586b\u5145\u5b57\u7b26\u6216\u6570\u5b57 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b \u53ef\u4ee5\u4f7f\u7528 Arrays.fill() \u65b9\u6cd5\u7528\u5176\u4ed6\u503c\uff08\u5982 0\u3001&#8221;&#8221;\uff09\u586b\u5145\u6570\u7ec4\u3002 int[] arr = new int[5]; Arrays.fill(arr, 10); \/\/ \u7528 10 \u586b\u5145\u6240\u6709\u5143\u7d20 \u767b\u5f55\u540e\u590d\u5236 \u91cd\u65b0\u5206\u914d\u6570\u7ec4\u5143\u7d20 \u5bf9\u4e8e\u5f15\u7528\u7c7b\u578b\uff0c\u53ef\u4ee5\u9010\u4e2a\u91cd\u65b0\u5206\u914d\u6570\u7ec4\u5143\u7d20\u7684\u503c\u3002 String[] arr = new String[5]; for (int i = 0; i [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-64214","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/64214","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=64214"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/64214\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=64214"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=64214"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=64214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}