{"id":66244,"date":"2025-05-03T14:22:58","date_gmt":"2025-05-03T06:22:58","guid":{"rendered":"https:\/\/fwq.ai\/blog\/66244\/"},"modified":"2025-05-03T14:22:58","modified_gmt":"2025-05-03T06:22:58","slug":"%e6%80%8e%e4%b9%88%e5%b0%86list%e8%bd%ac%e6%8d%a2%e4%b8%ba%e5%af%b9%e8%b1%a1%e6%95%b0%e7%bb%84-java-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/66244\/","title":{"rendered":"\u600e\u4e48\u5c06list\u8f6c\u6362\u4e3a\u5bf9\u8c61\u6570\u7ec4 java"},"content":{"rendered":"

\n \u5c06 list \u8f6c\u6362\u4e3a\u5bf9\u8c61\u6570\u7ec4\u6709\u4e24\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528 toarray() \u65b9\u6cd5\uff0c\u6307\u5b9a\u6570\u7ec4\u7c7b\u578b\u5e76\u8fd4\u56de\u4e00\u4e2a\u5305\u542b list \u5143\u7d20\u7684\u6570\u7ec4\u3002\u4f7f\u7528 java 8 streams api\uff0c\u5148\u5bf9 list \u8fdb\u884c\u64cd\u4f5c\uff0c\u7136\u540e\u8f6c\u6362\u4e3a\u5bf9\u8c61\u6570\u7ec4\u3002\n<\/p><\/blockquote>\n

\"\u600e\u4e48\u5c06list\u8f6c\u6362\u4e3a\u5bf9\u8c61\u6570\u7ec4<\/p>\n

\u5982\u4f55\u5c06 List \u8f6c\u6362\u4e3a\u5bf9\u8c61\u6570\u7ec4<\/strong><\/p>\n

\u65b9\u6cd5<\/h3>\n

\u5c06 List \u8f6c\u6362\u4e3a\u5bf9\u8c61\u6570\u7ec4\u6709\u4e24\u79cd\u5e38\u89c1\u65b9\u6cd5\uff1a<\/p>\n

\u65b9\u6cd5 1\uff1a\u4f7f\u7528 toArray() \u65b9\u6cd5<\/h3>\n

toArray() \u65b9\u6cd5\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5305\u542b List \u4e2d\u5143\u7d20\u7684\u6570\u7ec4\uff0c\u6570\u7ec4\u7684\u7c7b\u578b\u7531\u8c03\u7528 toArray() \u65f6\u6307\u5b9a\u7684\u7c7b\u578b\u53c2\u6570\u51b3\u5b9a\u3002\u4f8b\u5982\uff1a<\/p>\n

List<String> list = new ArrayList<>();\nlist.add(\"Java\");\nlist.add(\"Kotlin\");\n\n\/\/ \u5c06 List \u8f6c\u6362\u4e3a String[] \u6570\u7ec4\nString[] array = list.toArray(new String[0]);<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u65b9\u6cd5 2\uff1a\u4f7f\u7528 Streams<\/h3>\n
\u53ef\u4ee5\u4f7f\u7528 Java 8 \u4e2d\u7684 Streams API \u5c06 List \u8f6c\u6362\u4e3a\u5bf9\u8c61\u6570\u7ec4\uff0c\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n
\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n
List<String> list = new ArrayList<>();\nlist.add(\"Java\");\nlist.add(\"Kotlin\");\n\n\/\/ \u5c06 List \u8f6c\u6362\u4e3a String[] \u6570\u7ec4\nString[] array = list.stream().toArray(String[]::new);<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u6bd4\u8f83\u4e24\u79cd\u65b9\u6cd5<\/h3>\n
\u4e24\u79cd\u65b9\u6cd5\u90fd\u53ef\u4ee5\u5c06 List \u8f6c\u6362\u4e3a\u5bf9\u8c61\u6570\u7ec4\uff0c\u4f46\u5b83\u4eec\u6709\u4e00\u4e9b\u7ec6\u5fae\u5dee\u522b\uff1a<\/p>\n
    \n
  • toArray() \u65b9\u6cd5\u66f4\u7b80\u5355\u3001\u66f4\u65b9\u4fbf\u3002<\/strong><\/li>\n
  •  Streams \u65b9\u6cd5\u66f4\u7075\u6d3b\uff0c<\/strong>\u5b83\u5141\u8bb8\u901a\u8fc7\u6620\u5c04\u3001\u8fc7\u6ee4\u7b49\u64cd\u4f5c\u5bf9 List \u8fdb\u884c\u8f6c\u6362\u3002<\/li>\n
  •  Streams \u65b9\u6cd5\u5728\u5904\u7406\u5927\u91cf\u6570\u636e\u65f6\u53ef\u80fd\u66f4\u6709\u6548\uff0c<\/strong>\u56e0\u4e3a\u5b83\u4f7f\u7528\u5e76\u884c\u6d41\u3002<\/li>\n<\/ul>\n
    \u6ce8\u610f\u70b9<\/h3>\n
      \n
    • List \u4e2d\u5143\u7d20\u7684\u7c7b\u578b\u5fc5\u987b\u4e0e\u6570\u7ec4\u5143\u7d20\u7684\u7c7b\u578b\u517c\u5bb9\u3002<\/li>\n
    • \u5982\u679c List \u4e3a\u7a7a\uff0ctoArray() \u65b9\u6cd5\u5c06\u8fd4\u56de\u4e00\u4e2a\u7a7a\u6570\u7ec4\uff0cStreams \u65b9\u6cd5\u5c06\u629b\u51fa NullPointerException\u3002<\/li>\n
    • \u5982\u679c\u63d0\u4f9b\u7684\u6570\u7ec4\u7684\u957f\u5ea6\u5c0f\u4e8e List \u7684\u5927\u5c0f\uff0ctoArray() \u65b9\u6cd5\u5c06\u629b\u51fa ArrayIndexOutOfBoundsException\u3002<\/li>\n<\/ul>\n
      \u4ee5\u4e0a\u5c31\u662f\u600e\u4e48\u5c06list\u8f6c\u6362\u4e3a\u5bf9\u8c61\u6570\u7ec4 java\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u5c06 list \u8f6c\u6362\u4e3a\u5bf9\u8c61\u6570\u7ec4\u6709\u4e24\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528 toarray() \u65b9\u6cd5\uff0c\u6307\u5b9a\u6570\u7ec4\u7c7b\u578b\u5e76\u8fd4\u56de\u4e00\u4e2a\u5305\u542b list \u5143\u7d20\u7684\u6570\u7ec4\u3002\u4f7f\u7528 java 8 streams api\uff0c\u5148\u5bf9 list \u8fdb\u884c\u64cd\u4f5c\uff0c\u7136\u540e\u8f6c\u6362\u4e3a\u5bf9\u8c61\u6570\u7ec4\u3002 \u5982\u4f55\u5c06 List \u8f6c\u6362\u4e3a\u5bf9\u8c61\u6570\u7ec4 \u65b9\u6cd5 \u5c06 List \u8f6c\u6362\u4e3a\u5bf9\u8c61\u6570\u7ec4\u6709\u4e24\u79cd\u5e38\u89c1\u65b9\u6cd5\uff1a \u65b9\u6cd5 1\uff1a\u4f7f\u7528 toArray() \u65b9\u6cd5 toArray() \u65b9\u6cd5\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5305\u542b List \u4e2d\u5143\u7d20\u7684\u6570\u7ec4\uff0c\u6570\u7ec4\u7684\u7c7b\u578b\u7531\u8c03\u7528 toArray() \u65f6\u6307\u5b9a\u7684\u7c7b\u578b\u53c2\u6570\u51b3\u5b9a\u3002\u4f8b\u5982\uff1a List<String> list = new ArrayList<>(); list.add(“Java”); list.add(“Kotlin”); \/\/ \u5c06 List \u8f6c\u6362\u4e3a String[] \u6570\u7ec4 String[] array = list.toArray(new String[0]); \u767b\u5f55\u540e\u590d\u5236 \u65b9\u6cd5 2\uff1a\u4f7f\u7528 Streams \u53ef\u4ee5\u4f7f\u7528 Java 8 […]<\/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-66244","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/66244","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=66244"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/66244\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=66244"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=66244"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=66244"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}