{"id":39303,"date":"2024-11-26T09:52:55","date_gmt":"2024-11-26T01:52:55","guid":{"rendered":"https:\/\/fwq.ai\/blog\/39303\/"},"modified":"2024-11-26T09:52:55","modified_gmt":"2024-11-26T01:52:55","slug":"java%e6%80%8e%e4%b9%88%e7%bb%99%e5%8a%a8%e6%80%81%e6%95%b0%e7%bb%84%e6%b7%bb%e5%8a%a0%e5%85%83%e7%b4%a0","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/39303\/","title":{"rendered":"java\u600e\u4e48\u7ed9\u52a8\u6001\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20"},"content":{"rendered":"

\n java \u4e2d\u5411\u52a8\u6001\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\uff1a\u6dfb\u52a0\u5355\u4e2a\u5143\u7d20\uff1a\u4f7f\u7528 add() \u65b9\u6cd5\uff0c\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u672b\u5c3e\u3002\u6dfb\u52a0\u591a\u4e2a\u5143\u7d20\uff1a\u4f7f\u7528 addall() \u65b9\u6cd5\uff0c\u5c06\u5143\u7d20\u7ec4\u4f5c\u4e3a\u53c2\u6570\u6dfb\u52a0\u5230\u672b\u5c3e\u3002\u6307\u5b9a\u4f4d\u7f6e\u6dfb\u52a0\u5143\u7d20\uff1a\u4f7f\u7528 add() \u65b9\u6cd5\u5e76\u6307\u5b9a\u7d22\u5f15\uff0c\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u7279\u5b9a\u4f4d\u7f6e\u3002\u786e\u4fdd\u5bb9\u91cf\uff1a\u4f7f\u7528 ensurecapacity() \u65b9\u6cd5\u786e\u4fdd\u6570\u7ec4\u6709\u8db3\u591f\u7684\u5bb9\u91cf\uff0c\u63d0\u9ad8\u6027\u80fd\u3002\n<\/p><\/blockquote>\n

\"java\u600e\u4e48\u7ed9\u52a8\u6001\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u5728 Java \u4e2d\u5411\u52a8\u6001\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20<\/strong><\/p>\n

Java \u4e2d\u7684\u52a8\u6001\u6570\u7ec4\uff08\u4e5f\u79f0\u4e3a ArrayList\uff09\u662f\u4e00\u79cd\u53ef\u6839\u636e\u9700\u8981\u81ea\u52a8\u589e\u957f\u548c\u7f29\u5c0f\u7684\u6570\u636e\u7ed3\u6784\u3002\u5411\u52a8\u6001\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u7684\u8fc7\u7a0b\u5f88\u7b80\u5355\u3002<\/p>\n

\u6dfb\u52a0\u5355\u4e2a\u5143\u7d20<\/strong><\/p>\n

\u8981\u5411\u52a8\u6001\u6570\u7ec4\u6dfb\u52a0\u5355\u4e2a\u5143\u7d20\uff0c\u8bf7\u4f7f\u7528 add() \u65b9\u6cd5\u3002\u8be5\u65b9\u6cd5\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u6570\u7ec4\u7684\u672b\u5c3e\u3002\u4f8b\u5982\uff1a<\/p>\n

\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n

ArrayList<String> names = new ArrayList<>();\nnames.add(\"John\");<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u6dfb\u52a0\u591a\u4e2a\u5143\u7d20<\/strong><\/p>\n
\u8981\u5411\u52a8\u6001\u6570\u7ec4\u6dfb\u52a0\u591a\u4e2a\u5143\u7d20\uff0c\u53ef\u4ee5\u4f7f\u7528 addAll() \u65b9\u6cd5\u3002\u8be5\u65b9\u6cd5\u5c06\u4e00\u7ec4\u5143\u7d20\u4f5c\u4e3a\u53c2\u6570\uff0c\u5c06\u5176\u6dfb\u52a0\u5230\u6570\u7ec4\u7684\u672b\u5c3e\u3002\u4f8b\u5982\uff1a<\/p>\n
ArrayList<Integer> numbers = new ArrayList<>();\nnumbers.addAll(Arrays.asList(1, 2, 3));<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u6307\u5b9a\u4f4d\u7f6e\u6dfb\u52a0\u5143\u7d20<\/strong><\/p>\n
\u8981\u5411\u52a8\u6001\u6570\u7ec4\u7684\u7279\u5b9a\u4f4d\u7f6e\u6dfb\u52a0\u5143\u7d20\uff0c\u53ef\u4ee5\u4f7f\u7528 add() \u65b9\u6cd5\u5e76\u6307\u5b9a\u7d22\u5f15\u3002\u4f8b\u5982\uff1a<\/p>\n
ArrayList<Character> letters = new ArrayList<>();\nletters.add(0, 'A'); \/\/ \u5c06 'A' \u6dfb\u52a0\u5230\u5217\u8868\u7684\u5f00\u5934<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u786e\u4fdd\u5bb9\u91cf<\/strong><\/p>\n
\u5728\u6dfb\u52a0\u5927\u91cf\u5143\u7d20\u4e4b\u524d\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u4f7f\u7528 ensureCapacity() \u65b9\u6cd5\u6765\u786e\u4fdd\u52a8\u6001\u6570\u7ec4\u6709\u8db3\u591f\u7684\u5bb9\u91cf\u3002\u8fd9\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\uff0c\u56e0\u4e3a Java \u4e0d\u5fc5\u591a\u6b21\u91cd\u65b0\u5206\u914d\u6570\u7ec4\u7684\u5927\u5c0f\u3002\u4f8b\u5982\uff1a<\/p>\n
ArrayList<Double> prices = new ArrayList<>();\nprices.ensureCapacity(1000);\n\nfor (int i = 0; i < 1000; i++) {\n    prices.add(Math.random());\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u7ed9\u52a8\u6001\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
java \u4e2d\u5411\u52a8\u6001\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\uff1a\u6dfb\u52a0\u5355\u4e2a\u5143\u7d20\uff1a\u4f7f\u7528 add() \u65b9\u6cd5\uff0c\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u672b\u5c3e\u3002\u6dfb\u52a0\u591a\u4e2a\u5143\u7d20\uff1a\u4f7f\u7528 addall() \u65b9\u6cd5\uff0c\u5c06\u5143\u7d20\u7ec4\u4f5c\u4e3a\u53c2\u6570\u6dfb\u52a0\u5230\u672b\u5c3e\u3002\u6307\u5b9a\u4f4d\u7f6e\u6dfb\u52a0\u5143\u7d20\uff1a\u4f7f\u7528 add() \u65b9\u6cd5\u5e76\u6307\u5b9a\u7d22\u5f15\uff0c\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u7279\u5b9a\u4f4d\u7f6e\u3002\u786e\u4fdd\u5bb9\u91cf\uff1a\u4f7f\u7528 ensurecapacity() \u65b9\u6cd5\u786e\u4fdd\u6570\u7ec4\u6709\u8db3\u591f\u7684\u5bb9\u91cf\uff0c\u63d0\u9ad8\u6027\u80fd\u3002 \u5982\u4f55\u5728 Java \u4e2d\u5411\u52a8\u6001\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20 Java \u4e2d\u7684\u52a8\u6001\u6570\u7ec4\uff08\u4e5f\u79f0\u4e3a ArrayList\uff09\u662f\u4e00\u79cd\u53ef\u6839\u636e\u9700\u8981\u81ea\u52a8\u589e\u957f\u548c\u7f29\u5c0f\u7684\u6570\u636e\u7ed3\u6784\u3002\u5411\u52a8\u6001\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u7684\u8fc7\u7a0b\u5f88\u7b80\u5355\u3002 \u6dfb\u52a0\u5355\u4e2a\u5143\u7d20 \u8981\u5411\u52a8\u6001\u6570\u7ec4\u6dfb\u52a0\u5355\u4e2a\u5143\u7d20\uff0c\u8bf7\u4f7f\u7528 add() \u65b9\u6cd5\u3002\u8be5\u65b9\u6cd5\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u6570\u7ec4\u7684\u672b\u5c3e\u3002\u4f8b\u5982\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b ArrayList<String> names = new ArrayList<>(); names.add(“John”); \u767b\u5f55\u540e\u590d\u5236 \u6dfb\u52a0\u591a\u4e2a\u5143\u7d20 \u8981\u5411\u52a8\u6001\u6570\u7ec4\u6dfb\u52a0\u591a\u4e2a\u5143\u7d20\uff0c\u53ef\u4ee5\u4f7f\u7528 addAll() \u65b9\u6cd5\u3002\u8be5\u65b9\u6cd5\u5c06\u4e00\u7ec4\u5143\u7d20\u4f5c\u4e3a\u53c2\u6570\uff0c\u5c06\u5176\u6dfb\u52a0\u5230\u6570\u7ec4\u7684\u672b\u5c3e\u3002\u4f8b\u5982\uff1a ArrayList<Integer> numbers = new ArrayList<>(); numbers.addAll(Arrays.asList(1, 2, 3)); \u767b\u5f55\u540e\u590d\u5236 \u6307\u5b9a\u4f4d\u7f6e\u6dfb\u52a0\u5143\u7d20 \u8981\u5411\u52a8\u6001\u6570\u7ec4\u7684\u7279\u5b9a\u4f4d\u7f6e\u6dfb\u52a0\u5143\u7d20\uff0c\u53ef\u4ee5\u4f7f\u7528 add() \u65b9\u6cd5\u5e76\u6307\u5b9a\u7d22\u5f15\u3002\u4f8b\u5982\uff1a ArrayList<Character> letters = new ArrayList<>(); letters.add(0, ‘A’); \/\/ \u5c06 ‘A’ […]<\/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-39303","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39303","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=39303"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39303\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=39303"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=39303"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=39303"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}