{"id":34449,"date":"2024-11-26T10:12:07","date_gmt":"2024-11-26T02:12:07","guid":{"rendered":"https:\/\/fwq.ai\/blog\/34449\/"},"modified":"2024-11-26T10:12:07","modified_gmt":"2024-11-26T02:12:07","slug":"java%e5%8a%a8%e6%80%81%e6%95%b0%e7%bb%84%e6%80%8e%e4%b9%88%e6%94%b9%e5%8f%98%e9%95%bf%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/34449\/","title":{"rendered":"java\u52a8\u6001\u6570\u7ec4\u600e\u4e48\u6539\u53d8\u957f\u5ea6"},"content":{"rendered":"<blockquote><p>\n  java\u52a8\u6001\u6570\u7ec4\uff08arraylist\uff09\u7684\u957f\u5ea6\u53ef\u4ee5\u901a\u8fc7\u4e24\u79cd\u65b9\u5f0f\u6539\u53d8\uff1a\u4f7f\u7528add()\u548cremove()\u65b9\u6cd5\u589e\u52a0\u6216\u51cf\u5c11\u5143\u7d20\uff1b\u4f7f\u7528trimtosize()\u548censurecapacity()\u65b9\u6cd5\u8c03\u6574\u6570\u7ec4\u5927\u5c0f\uff0c\u5206\u522b\u7f29\u5c0f\u6216\u786e\u4fdd\u6307\u5b9a\u5bb9\u91cf\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/02\/2024110214070212376.jpg\" class=\"aligncenter\" title=\"java\u52a8\u6001\u6570\u7ec4\u600e\u4e48\u6539\u53d8\u957f\u5ea6\u63d2\u56fe\" alt=\"java\u52a8\u6001\u6570\u7ec4\u600e\u4e48\u6539\u53d8\u957f\u5ea6\u63d2\u56fe\" \/><\/p>\n<p><strong>Java\u52a8\u6001\u6570\u7ec4\u5982\u4f55\u6539\u53d8\u957f\u5ea6\uff1f<\/strong><\/p>\n<p>Java\u52a8\u6001\u6570\u7ec4\uff08ArrayList\uff09\u662f\u4e00\u79cd\u53ef\u53d8\u957f\u5ea6\u7684\u96c6\u5408\uff0c\u8fd9\u610f\u5473\u7740\u5176\u5927\u5c0f\u53ef\u4ee5\u6839\u636e\u9700\u8981\u8fdb\u884c\u8c03\u6574\u3002\u6539\u53d8\u5176\u957f\u5ea6\u6709\u4e24\u79cd\u4e3b\u8981\u65b9\u6cd5\uff1a<\/p>\n<p><strong>1. \u4f7f\u7528add()\u548cremove()\u65b9\u6cd5\uff1a<\/strong><\/p>\n<ul>\n<li> <strong>add()\uff1a<\/strong>\u7528\u4e8e\u5411\u5217\u8868\u672b\u5c3e\u6dfb\u52a0\u65b0\u5143\u7d20\uff0c\u4ece\u800c\u589e\u52a0\u5176\u957f\u5ea6\u3002<\/li>\n<li> <strong>remove()\uff1a<\/strong>\u7528\u4e8e\u4ece\u5217\u8868\u4e2d\u5220\u9664\u4e00\u4e2a\u5143\u7d20\uff0c\u4ece\u800c\u51cf\u5c11\u5176\u957f\u5ea6\u3002<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>ArrayList&lt;String&gt; myList = new ArrayList&lt;&gt;();\n\n\/\/ \u589e\u52a0\u957f\u5ea6\nmyList.add(\"\u5143\u7d20 1\");\nmyList.add(\"\u5143\u7d20 2\");\n\n\/\/ \u51cf\u5c11\u957f\u5ea6\nmyList.remove(\"\u5143\u7d20 1\");<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>2. \u4f7f\u7528trimToSize()\u548censureCapacity()\u65b9\u6cd5\uff1a<\/strong><\/p>\n<ul>\n<li> <strong>trimToSize()\uff1a<\/strong>\u7f29\u5c0f\u6570\u7ec4\u7684\u5927\u5c0f\uff0c\u4f7f\u5176\u4e0e\u5143\u7d20\u6570\u91cf\u76f8\u5339\u914d\u3002<\/li>\n<li> <strong>ensureCapacity()\uff1a<\/strong>\u786e\u4fdd\u6570\u7ec4\u5177\u6709\u6307\u5b9a\u7684\u6700\u5c0f\u5bb9\u91cf\u3002\u5982\u679c\u5f53\u524d\u5bb9\u91cf\u4e0d\u8db3\uff0c\u5b83\u5c06\u81ea\u52a8\u589e\u957f\u6570\u7ec4\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>ArrayList&lt;String&gt; myList = new ArrayList&lt;&gt;();\n\n\/\/ \u7f29\u5c0f\u957f\u5ea6\nmyList.trimToSize();\n\n\/\/ \u786e\u4fdd\u5bb9\u91cf\nmyList.ensureCapacity(100); \/\/ \u8bbe\u7f6e\u6700\u5c0f\u5bb9\u91cf\u4e3a 100<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u6ce8\u610f\uff1a<\/strong><\/p>\n<ul>\n<li>\u4f7f\u7528add()\u548cremove()\u65b9\u6cd5\u662f\u6539\u53d8\u957f\u5ea6\u7684\u66f4\u5e38\u89c1\u65b9\u6cd5\u3002<\/li>\n<li>trimToSize()\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\uff0c\u56e0\u4e3a\u5b83\u91ca\u653e\u4e86\u672a\u4f7f\u7528\u7684\u7a7a\u95f4\u3002<\/li>\n<li>ensureCapacity()\u4ec5\u5728\u60a8\u9884\u89c1\u5230\u5217\u8868\u5c06\u5927\u91cf\u589e\u957f\u65f6\u624d\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u52a8\u6001\u6570\u7ec4\u600e\u4e48\u6539\u53d8\u957f\u5ea6\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":"<p>java\u52a8\u6001\u6570\u7ec4\uff08arraylist\uff09\u7684\u957f\u5ea6\u53ef\u4ee5\u901a\u8fc7\u4e24\u79cd\u65b9\u5f0f\u6539\u53d8\uff1a\u4f7f\u7528add()\u548cremove()\u65b9\u6cd5\u589e\u52a0\u6216\u51cf\u5c11\u5143\u7d20\uff1b\u4f7f\u7528trimtosize()\u548censurecapacity()\u65b9\u6cd5\u8c03\u6574\u6570\u7ec4\u5927\u5c0f\uff0c\u5206\u522b\u7f29\u5c0f\u6216\u786e\u4fdd\u6307\u5b9a\u5bb9\u91cf\u3002 Java\u52a8\u6001\u6570\u7ec4\u5982\u4f55\u6539\u53d8\u957f\u5ea6\uff1f Java\u52a8\u6001\u6570\u7ec4\uff08ArrayList\uff09\u662f\u4e00\u79cd\u53ef\u53d8\u957f\u5ea6\u7684\u96c6\u5408\uff0c\u8fd9\u610f\u5473\u7740\u5176\u5927\u5c0f\u53ef\u4ee5\u6839\u636e\u9700\u8981\u8fdb\u884c\u8c03\u6574\u3002\u6539\u53d8\u5176\u957f\u5ea6\u6709\u4e24\u79cd\u4e3b\u8981\u65b9\u6cd5\uff1a 1. \u4f7f\u7528add()\u548cremove()\u65b9\u6cd5\uff1a add()\uff1a\u7528\u4e8e\u5411\u5217\u8868\u672b\u5c3e\u6dfb\u52a0\u65b0\u5143\u7d20\uff0c\u4ece\u800c\u589e\u52a0\u5176\u957f\u5ea6\u3002 remove()\uff1a\u7528\u4e8e\u4ece\u5217\u8868\u4e2d\u5220\u9664\u4e00\u4e2a\u5143\u7d20\uff0c\u4ece\u800c\u51cf\u5c11\u5176\u957f\u5ea6\u3002 \u793a\u4f8b\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b ArrayList&lt;String&gt; myList = new ArrayList&lt;&gt;(); \/\/ \u589e\u52a0\u957f\u5ea6 myList.add(&#8220;\u5143\u7d20 1&#8221;); myList.add(&#8220;\u5143\u7d20 2&#8221;); \/\/ \u51cf\u5c11\u957f\u5ea6 myList.remove(&#8220;\u5143\u7d20 1&#8221;); \u767b\u5f55\u540e\u590d\u5236 2. \u4f7f\u7528trimToSize()\u548censureCapacity()\u65b9\u6cd5\uff1a trimToSize()\uff1a\u7f29\u5c0f\u6570\u7ec4\u7684\u5927\u5c0f\uff0c\u4f7f\u5176\u4e0e\u5143\u7d20\u6570\u91cf\u76f8\u5339\u914d\u3002 ensureCapacity()\uff1a\u786e\u4fdd\u6570\u7ec4\u5177\u6709\u6307\u5b9a\u7684\u6700\u5c0f\u5bb9\u91cf\u3002\u5982\u679c\u5f53\u524d\u5bb9\u91cf\u4e0d\u8db3\uff0c\u5b83\u5c06\u81ea\u52a8\u589e\u957f\u6570\u7ec4\u5927\u5c0f\u3002 \u793a\u4f8b\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b ArrayList&lt;String&gt; myList = new ArrayList&lt;&gt;(); \/\/ \u7f29\u5c0f\u957f\u5ea6 myList.trimToSize(); \/\/ \u786e\u4fdd\u5bb9\u91cf myList.ensureCapacity(100); \/\/ \u8bbe\u7f6e\u6700\u5c0f\u5bb9\u91cf\u4e3a 100 \u767b\u5f55\u540e\u590d\u5236 \u6ce8\u610f\uff1a \u4f7f\u7528add()\u548cremove()\u65b9\u6cd5\u662f\u6539\u53d8\u957f\u5ea6\u7684\u66f4\u5e38\u89c1\u65b9\u6cd5\u3002 trimToSize()\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\uff0c\u56e0\u4e3a\u5b83\u91ca\u653e\u4e86\u672a\u4f7f\u7528\u7684\u7a7a\u95f4\u3002 ensureCapacity()\u4ec5\u5728\u60a8\u9884\u89c1\u5230\u5217\u8868\u5c06\u5927\u91cf\u589e\u957f\u65f6\u624d\u4f7f\u7528\u3002 \u4ee5\u4e0a\u5c31\u662fjava\u52a8\u6001\u6570\u7ec4\u600e\u4e48\u6539\u53d8\u957f\u5ea6\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/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-34449","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/34449","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=34449"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/34449\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=34449"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=34449"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=34449"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}