{"id":1308,"date":"2026-04-26T22:52:21","date_gmt":"2026-04-26T14:52:21","guid":{"rendered":"https:\/\/yunyanglib.cn\/?p=1308"},"modified":"2026-04-26T22:54:31","modified_gmt":"2026-04-26T14:54:31","slug":"%e3%80%90java%e3%80%91arraylist%e8%af%a6%e8%a7%a3%ef%bc%9a%e4%bb%8e%e4%bd%bf%e7%94%a8%e5%88%b0%e6%ba%90%e7%a0%81%e7%9a%84%e5%85%a8%e9%9d%a2%e5%89%96%e6%9e%90","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=1308","title":{"rendered":"\u3010Java\u3011ArrayList\u8be6\u89e3\uff1a\u4ece\u4f7f\u7528\u5230\u6e90\u7801\u7684\u5168\u9762\u5256\u6790"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u4f5c\u4e3a Java \u96c6\u5408\u6846\u67b6\u4e2d\u6700\u5e38\u7528\u7684\u7c7b\u4e4b\u4e00\uff0cArrayList \u51ed\u501f\u5176\u52a8\u6001\u6269\u5bb9\u7684\u7279\u6027\u3001\u4fbf\u6377\u7684\u589e\u5220\u6539\u67e5\u64cd\u4f5c\uff0c\u6210\u4e3a\u65e5\u5e38\u5f00\u53d1\u4e2d\u7684 &#8220;\u5e38\u5ba2&#8221;\u3002\u4f46\u5f88\u591a\u5f00\u53d1\u8005\u53ef\u80fd\u53ea\u505c\u7559\u5728 &#8220;\u4f1a\u7528&#8221; \u7684\u5c42\u9762\uff0c\u5bf9\u5176\u5e95\u5c42\u5b9e\u73b0\u3001\u6269\u5bb9\u673a\u5236\u53ca\u6027\u80fd\u4f18\u5316\u5374\u4e00\u77e5\u534a\u89e3\u3002\u4eca\u5929\u8fd9\u7bc7\u6587\u7ae0\uff0c\u6211\u5c06\u4ece\u5b9e\u6218\u4f7f\u7528\u3001\u6e90\u7801\u89e3\u6790\u3001\u6027\u80fd\u5206\u6790\u4e09\u4e2a\u7ef4\u5ea6\uff0c\u5e26\u5927\u5bb6\u5f7b\u5e95\u5403\u900f ArrayList\uff01<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001ArrayList \u6838\u5fc3\u7279\u6027<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ArrayList \u662f List \u63a5\u53e3\u7684\u52a8\u6001\u6570\u7ec4\u5b9e\u73b0\uff0c\u6838\u5fc3\u7279\u70b9\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u57fa\u4e8e\u6570\u7ec4\u5b58\u50a8\u5143\u7d20\uff0c\u652f\u6301\u968f\u673a\u8bbf\u95ee\uff08\u901a\u8fc7\u7d22\u5f15\u76f4\u63a5\u83b7\u53d6\u5143\u7d20\uff09<\/li>\n\n\n\n<li>\u5143\u7d20\u6709\u5e8f\u4e14\u53ef\u91cd\u590d\uff0c\u5141\u8bb8\u5b58\u50a8 null \u503c<\/li>\n\n\n\n<li>\u5bb9\u91cf\u52a8\u6001\u6269\u5bb9\uff0c\u9ed8\u8ba4\u521d\u59cb\u5bb9\u91cf\u4e3a 10<\/li>\n\n\n\n<li>\u7ebf\u7a0b\u4e0d\u5b89\u5168\uff0c\u9002\u5408\u5355\u7ebf\u7a0b\u73af\u5883\uff08\u591a\u7ebf\u7a0b\u53ef\u4f7f\u7528<code>Collections.synchronizedList()<\/code>\u6216<code>CopyOnWriteArrayList<\/code>\uff09<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001ArrayList \u5b9e\u6218\u4f7f\u7528<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u521b\u5efa ArrayList<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">ArrayList \u63d0\u4f9b\u4e09\u79cd\u5e38\u89c1\u521b\u5efa\u65b9\u5f0f\uff0c\u6839\u636e\u573a\u666f\u9009\u62e9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ 1. \u57fa\u672c\u521b\u5efa\u65b9\u5f0f\uff08\u6307\u5b9a\u5143\u7d20\u7c7b\u578b\uff09\nArrayList&lt;String&gt; alist1 = new ArrayList();\n\n\/\/ 2. \u57fa\u4e8eList\u63a5\u53e3\uff08\u7c7b\u578b\u63a8\u65ad\uff0cJDK7+\u652f\u6301\uff09\nList&lt;String&gt; alist2 = new ArrayList&lt;&gt;();\n\n\/\/ 3. \u6307\u5b9a\u521d\u59cb\u5bb9\u91cf\uff08\u907f\u514d\u9891\u7e41\u6269\u5bb9\uff0c\u63a8\u8350\u5df2\u77e5\u5143\u7d20\u6570\u91cf\u65f6\u4f7f\u7528\uff09\nList&lt;String&gt; alist3 = new ArrayList&lt;&gt;(15);\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u589e\u5220\u6539\u67e5\u64cd\u4f5c<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\uff081\uff09\u6dfb\u52a0\u5143\u7d20<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u672b\u5c3e\u6dfb\u52a0\uff1a<code>add(E e)<\/code><\/li>\n\n\n\n<li>\u6307\u5b9a\u4f4d\u7f6e\u6dfb\u52a0\uff1a<code>add(int index, E element)<\/code><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;String&gt; userList = new ArrayList&lt;&gt;();\n\/\/ \u672b\u5c3e\u6dfb\u52a0\u5143\u7d20\nuserList.add(\"\u5f20\u4e09\");\nuserList.add(\"\u674e\u56db\");\nuserList.add(null); \/\/ \u5141\u8bb8\u6dfb\u52a0null\n\n\/\/ \u6307\u5b9a\u7d22\u5f15\u6dfb\u52a0\uff08\u7d22\u5f150-2\uff0c\u8d85\u51fa\u8303\u56f4\u629bIndexOutOfBoundsException\uff09\nuserList.add(1, \"\u738b\u4e94\");\nSystem.out.println(userList); \/\/ \u8f93\u51fa\uff1a&#91;\u5f20\u4e09, \u738b\u4e94, \u674e\u56db, null]<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\uff082\uff09\u4fee\u6539\u5143\u7d20<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528<code>set(int index, E element)<\/code>\u901a\u8fc7\u7d22\u5f15\u4fee\u6539\u5143\u7d20\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u5c06\u7d22\u5f150\u7684\u5143\u7d20\u6539\u4e3a\"\u5f20\u4e09\u4e30\"\nuserList.set(0, \"\u5f20\u4e09\u4e30\");\nSystem.out.println(userList); \/\/ \u8f93\u51fa\uff1a&#91;\u5f20\u4e09\u4e30, \u738b\u4e94, \u674e\u56db, null]\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\uff083\uff09\u5220\u9664\u5143\u7d20<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6309\u7d22\u5f15\u5220\u9664\uff1a<code>remove(int index)<\/code><\/li>\n\n\n\n<li>\u6309\u5143\u7d20\u5220\u9664\uff1a<code>remove(Object o)<\/code><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u6309\u7d22\u5f15\u5220\u9664\uff08\u8fd4\u56de\u88ab\u5220\u9664\u5143\u7d20\uff09\nString removed = userList.remove(2);\nSystem.out.println(\"\u5220\u9664\u7684\u5143\u7d20\uff1a\" + removed); \/\/ \u8f93\u51fa\uff1a\u674e\u56db\n\n\/\/ \u6309\u5143\u7d20\u5220\u9664\uff08\u5220\u9664\u7b2c\u4e00\u4e2a\u5339\u914d\u7684\u5143\u7d20\uff0c\u8fd4\u56deboolean\uff09\nboolean isRemoved = userList.remove(\"\u738b\u4e94\");\nSystem.out.println(\"\u662f\u5426\u5220\u9664\u6210\u529f\uff1a\" + isRemoved); \/\/ \u8f93\u51fa\uff1atrue\n\n\/\/ \u5220\u9664null\u5143\u7d20\nuserList.remove(null);\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\uff084\uff09\u67e5\u627e\u5143\u7d20<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7d22\u5f15\u67e5\u627e\uff1a<code>get(int index)<\/code><\/li>\n\n\n\n<li>\u5143\u7d20\u4f4d\u7f6e\u67e5\u627e\uff1a<code>indexOf(Object o)<\/code>\u3001<code>lastIndexOf(Object o)<\/code><\/li>\n\n\n\n<li>\u5305\u542b\u5224\u65ad\uff1a<code>contains(Object o)<\/code><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u901a\u8fc7\u7d22\u5f15\u83b7\u53d6\u5143\u7d20\nString first = userList.get(0);\nSystem.out.println(\"\u7b2c\u4e00\u4e2a\u5143\u7d20\uff1a\" + first); \/\/ \u8f93\u51fa\uff1a\u5f20\u4e09\u4e30\n\n\/\/ \u67e5\u627e\u5143\u7d20\u4f4d\u7f6e\uff08\u6b63\u5e8f\uff09\nint index = userList.indexOf(\"\u5f20\u4e09\u4e30\");\nSystem.out.println(\"\u5143\u7d20\u4f4d\u7f6e\uff1a\" + index); \/\/ \u8f93\u51fa\uff1a0\n\n\/\/ \u67e5\u627e\u5143\u7d20\u4f4d\u7f6e\uff08\u5012\u5e8f\uff09\nuserList.add(\"\u5f20\u4e09\u4e30\");\nint lastIndex = userList.lastIndexOf(\"\u5f20\u4e09\u4e30\");\nSystem.out.println(\"\u6700\u540e\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\uff1a\" + lastIndex); \/\/ \u8f93\u51fa\uff1a1\n\n\/\/ \u5224\u65ad\u662f\u5426\u5305\u542b\u5143\u7d20\nboolean hasElement = userList.contains(\"\u5f20\u4e09\u4e30\");\nSystem.out.println(\"\u662f\u5426\u5305\u542b\u8be5\u5143\u7d20\uff1a\" + hasElement); \/\/ \u8f93\u51fa\uff1atrue\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u6392\u5e8f\u4e0e\u4e8c\u5206\u67e5\u627e<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u82e5\u5143\u7d20\u5df2\u6392\u5e8f\uff0c\u53ef\u4f7f\u7528\u4e8c\u5206\u67e5\u627e\u63d0\u5347\u67e5\u8be2\u6548\u7387\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Integer&gt; numList = new ArrayList&lt;&gt;(Arrays.asList(3, 1, 4, 1, 5, 9));\n\/\/ \u6392\u5e8f\uff08\u9ed8\u8ba4\u5347\u5e8f\uff09\nCollections.sort(numList);\nSystem.out.println(\"\u6392\u5e8f\u540e\uff1a\" + numList); \/\/ \u8f93\u51fa\uff1a&#91;1, 1, 3, 4, 5, 9]\n\/\/ \u4e8c\u5206\u67e5\u627e\uff08\u8fd4\u56de\u5143\u7d20\u7d22\u5f15\uff0c\u672a\u627e\u5230\u8fd4\u56de\u8d1f\u6570\uff09\nint searchIndex = Collections.binarySearch(numList, 4);\nSystem.out.println(\"\u5143\u7d204\u7684\u4f4d\u7f6e\uff1a\" + searchIndex); \/\/ \u8f93\u51fa\uff1a3\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u5e95\u5c42\u6e90\u7801\u89e3\u6790<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u6838\u5fc3\u6210\u5458\u53d8\u91cf<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">ArrayList \u7684\u6838\u5fc3\u72b6\u6001\u7531\u4e09\u4e2a\u53d8\u91cf\u7ef4\u62a4\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u5b58\u50a8\u5143\u7d20\u7684\u6570\u7ec4\uff08transient\u907f\u514d\u5e8f\u5217\u5316\u65f6\u5b58\u50a8\u7a7a\u5143\u7d20\uff09\ntransient Object&#91;] elementData;\n\/\/ \u5b9e\u9645\u5143\u7d20\u4e2a\u6570\nprivate int size;\n\/\/ \u9ed8\u8ba4\u521d\u59cb\u5bb9\u91cf\nprivate static final int DEFAULT_CAPACITY = 10;\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u6784\u9020\u65b9\u6cd5<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u65e0\u53c2\u6784\u9020\uff1a\u521d\u59cb\u5316\u7a7a\u6570\u7ec4\uff08\u9996\u6b21\u6dfb\u52a0\u5143\u7d20\u65f6\u6269\u5bb9\u4e3a10\uff09\npublic ArrayList() {\n    this.elementData = DEFAULTCAPACITY_EMPTY_ELEMENTDATA;\n}\n\n\/\/ \u6307\u5b9a\u521d\u59cb\u5bb9\u91cf\u6784\u9020\npublic ArrayList(int initialCapacity) {\n    if (initialCapacity &gt; 0) {\n        this.elementData = new Object&#91;initialCapacity];\n    } else if (initialCapacity == 0) {\n        this.elementData = EMPTY_ELEMENTDATA;\n    } else {\n        throw new IllegalArgumentException(\"Illegal Capacity: \" + initialCapacity);\n    }\n}\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u6269\u5bb9\u673a\u5236\uff08\u5173\u952e\uff01\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u6dfb\u52a0\u5143\u7d20\u65f6\uff0c\u82e5\u6570\u7ec4\u5df2\u6ee1\uff08<code>size == elementData.length<\/code>\uff09\uff0c\u4f1a\u89e6\u53d1\u6269\u5bb9\u3002\u6838\u5fc3\u903b\u8f91\u5728<code>grow()<\/code>\u65b9\u6cd5\u4e2d\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>private void grow(int minCapacity) {\n    \/\/ \u539f\u5bb9\u91cf\n    int oldCapacity = elementData.length;\n    \/\/ \u65b0\u5bb9\u91cf = \u539f\u5bb9\u91cf + \u539f\u5bb9\u91cf\/2\uff081.5\u500d\u6269\u5bb9\uff09\n    int newCapacity = oldCapacity + (oldCapacity &gt;&gt; 1);\n    \n    \/\/ \u5904\u7406\u521d\u59cb\u4e3a\u7a7a\u6570\u7ec4\u7684\u60c5\u51b5\uff08\u9996\u6b21\u6269\u5bb9\u4e3a10\uff09\n    if (newCapacity - minCapacity &lt; 0)\n        newCapacity = minCapacity;\n    \n    \/\/ \u5904\u7406\u8d85\u5927\u5bb9\u91cf\uff08\u8d85\u8fc7Integer.MAX_VALUE - 8\u65f6\uff09\n    if (newCapacity - MAX_ARRAY_SIZE &gt; 0)\n        newCapacity = hugeCapacity(minCapacity);\n    \n    \/\/ \u590d\u5236\u539f\u6570\u7ec4\u5143\u7d20\u5230\u65b0\u6570\u7ec4\n    elementData = Arrays.copyOf(elementData, newCapacity);\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6269\u5bb9\u5173\u952e\u7ed3\u8bba<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9ed8\u8ba4\u6269\u5bb9\u4e3a\u539f\u5bb9\u91cf\u7684 1.5 \u500d\uff08\u901a\u8fc7\u53f3\u79fb\u64cd\u4f5c<code>oldCapacity &gt;&gt; 1<\/code>\u5b9e\u73b0\uff0c\u6548\u7387\u66f4\u9ad8\uff09<\/li>\n\n\n\n<li>\u9996\u6b21\u6dfb\u52a0\u5143\u7d20\u65f6\uff0c\u7a7a\u6570\u7ec4\u4f1a\u6269\u5bb9\u4e3a\u9ed8\u8ba4\u5bb9\u91cf 10<\/li>\n\n\n\n<li>\u6269\u5bb9\u65f6\u4f1a\u521b\u5efa\u65b0\u6570\u7ec4\u5e76\u590d\u5236\u5143\u7d20\uff0c\u9891\u7e41\u6269\u5bb9\u4f1a\u5f71\u54cd\u6027\u80fd\uff08\u5efa\u8bae\u63d0\u524d\u6307\u5b9a\u521d\u59cb\u5bb9\u91cf\uff09<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u5173\u952e\u65b9\u6cd5\u6e90\u7801<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\uff081\uff09add(int index, E element)<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u6307\u5b9a\u4f4d\u7f6e\u6dfb\u52a0\u5143\u7d20\u9700\u79fb\u52a8\u540e\u7eed\u5143\u7d20\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public void add(int index, E element) {\n    \/\/ \u68c0\u67e5\u7d22\u5f15\u5408\u6cd5\u6027\n    rangeCheckForAdd(index);\n    \/\/ \u786e\u4fdd\u5bb9\u91cf\u8db3\u591f\n    ensureCapacityInternal(size + 1);\n    \/\/ \u590d\u5236\u6570\u7ec4\uff1aindex\u53ca\u540e\u7eed\u5143\u7d20\u5411\u540e\u79fb\u52a81\u4f4d\uff08\u672c\u5730\u65b9\u6cd5\uff0c\u6548\u7387\u8f83\u9ad8\uff09\n    System.arraycopy(elementData, index, elementData, index + 1, size - index);\n    \/\/ \u63d2\u5165\u65b0\u5143\u7d20\n    elementData&#91;index] = element;\n    size++;\n}\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\uff082\uff09remove(int index)<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u5220\u9664\u5143\u7d20\u9700\u79fb\u52a8\u540e\u7eed\u5143\u7d20\u586b\u8865\u7a7a\u4f4d\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public E remove(int index) {\n    rangeCheck(index);\n    modCount++;\n    E oldValue = elementData(index);\n    \/\/ \u8ba1\u7b97\u9700\u8981\u79fb\u52a8\u7684\u5143\u7d20\u4e2a\u6570\n    int numMoved = size - index - 1;\n    if (numMoved &gt; 0)\n        System.arraycopy(elementData, index + 1, elementData, index, numMoved);\n    \/\/ \u7f6e\u7a7a\u6700\u540e\u4e00\u4e2a\u5143\u7d20\uff0c\u5e2e\u52a9GC\n    elementData&#91;--size] = null;\n    return oldValue;\n}\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u65f6\u95f4\u590d\u6742\u5ea6\u5206\u6790<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ArrayList \u7684\u6027\u80fd\u5173\u952e\u5728\u4e8e &#8220;\u7d22\u5f15\u64cd\u4f5c&#8221; \u4e0e &#8220;\u975e\u7d22\u5f15\u64cd\u4f5c&#8221; \u7684\u533a\u522b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">\u64cd\u4f5c<\/th><th class=\"has-text-align-left\" data-align=\"left\">\u65f6\u95f4\u590d\u6742\u5ea6<\/th><th class=\"has-text-align-left\" data-align=\"left\">\u8bf4\u660e<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">\u67e5\u8be2\uff08get\uff09<\/td><td class=\"has-text-align-left\" data-align=\"left\">O(1)<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u76f4\u63a5\u901a\u8fc7\u7d22\u5f15\u8bbf\u95ee\uff0c\u968f\u673a\u8bbf\u95ee\u6548\u7387\u9ad8<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">\u4fee\u6539\uff08set\uff09<\/td><td class=\"has-text-align-left\" data-align=\"left\">O(1)<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u7d22\u5f15\u5b9a\u4f4d\u540e\u76f4\u63a5\u4fee\u6539<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">\u672b\u5c3e\u6dfb\u52a0\uff08add\uff09<\/td><td class=\"has-text-align-left\" data-align=\"left\">O(1)<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u65e0\u5143\u7d20\u79fb\u52a8\uff0c\u4ec5\u9700\u8d4b\u503c<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">\u4e2d\u95f4 \/ \u5f00\u5934\u6dfb\u52a0<\/td><td class=\"has-text-align-left\" data-align=\"left\">O(n)<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u9700\u79fb\u52a8\u540e\u7eed n \u4e2a\u5143\u7d20<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">\u4e2d\u95f4 \/ \u5f00\u5934\u5220\u9664<\/td><td class=\"has-text-align-left\" data-align=\"left\">O(n)<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u9700\u79fb\u52a8\u540e\u7eed n \u4e2a\u5143\u7d20<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6027\u80fd\u4f18\u5316\u5efa\u8bae<\/strong>\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5df2\u77e5\u5143\u7d20\u6570\u91cf\u65f6\uff0c\u521b\u5efa\u65f6\u6307\u5b9a\u521d\u59cb\u5bb9\u91cf\uff0c\u907f\u514d\u6269\u5bb9<\/li>\n\n\n\n<li>\u9891\u7e41\u5728\u4e2d\u95f4\u63d2\u5165 \/ \u5220\u9664\u5143\u7d20\u65f6\uff0c\u8003\u8651\u4f7f\u7528 LinkedList\uff08O (1) \u63d2\u5165\u5220\u9664\uff0c\u4f46\u67e5\u8be2 O (n)\uff09<\/li>\n\n\n\n<li>\u904d\u5386 ArrayList \u65f6\uff0c\u4f7f\u7528\u589e\u5f3a for \u5faa\u73af\u6216\u8fed\u4ee3\u5668\uff08\u6548\u7387\u9ad8\u4e8e\u666e\u901a for \u5faa\u73af\uff09<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u5e38\u89c1\u9762\u8bd5\u9898<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>ArrayList \u4e0e LinkedList \u7684\u533a\u522b\uff1f<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5e95\u5c42\u5b9e\u73b0\uff1aArrayList \u57fa\u4e8e\u6570\u7ec4\uff0cLinkedList \u57fa\u4e8e\u53cc\u5411\u94fe\u8868<\/li>\n\n\n\n<li>\u8bbf\u95ee\u6548\u7387\uff1aArrayList \u968f\u673a\u8bbf\u95ee O (1)\uff0cLinkedListO (n)<\/li>\n\n\n\n<li>\u63d2\u5165\u5220\u9664\uff1aArrayList \u4e2d\u95f4\u64cd\u4f5c O (n)\uff0cLinkedListO (1)<\/li>\n\n\n\n<li>\u5185\u5b58\u5360\u7528\uff1aArrayList \u8fde\u7eed\u5b58\u50a8\uff0cLinkedList \u9700\u5b58\u50a8\u8282\u70b9\u6307\u9488\uff0c\u5185\u5b58\u5f00\u9500\u66f4\u5927<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>ArrayList \u7684\u6269\u5bb9\u673a\u5236\uff1f<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u9ed8\u8ba4\u521d\u59cb\u5bb9\u91cf 10\uff0c\u6269\u5bb9\u4e3a\u539f\u5bb9\u91cf\u7684 1.5 \u500d<\/li>\n\n\n\n<li>\u6269\u5bb9\u65f6\u901a\u8fc7<code>Arrays.copyOf()<\/code>\u590d\u5236\u5143\u7d20\u5230\u65b0\u6570\u7ec4<\/li>\n\n\n\n<li>\u9996\u6b21\u6dfb\u52a0\u5143\u7d20\u65f6\uff0c\u7a7a\u6570\u7ec4\u6269\u5bb9\u4e3a 10<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>ArrayList \u5982\u4f55\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\uff1f<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u539f\u751f\u7ebf\u7a0b\u4e0d\u5b89\u5168<\/li>\n\n\n\n<li>\u89e3\u51b3\u65b9\u6848\uff1a<code>Collections.synchronizedList(list)<\/code>\u3001<code>CopyOnWriteArrayList<\/code>\u3001<code>Vector<\/code>\uff08\u4e0d\u63a8\u8350\uff0c\u6548\u7387\u4f4e\uff09<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u603b\u7ed3<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ArrayList \u662f Java \u5f00\u53d1\u4e2d\u6700\u57fa\u7840\u4e5f\u6700\u5e38\u7528\u7684\u96c6\u5408\u7c7b\uff0c\u638c\u63e1\u5176\u4f7f\u7528\u65b9\u6cd5\u3001\u5e95\u5c42\u5b9e\u73b0\u53ca\u6027\u80fd\u7279\u70b9\uff0c\u80fd\u5e2e\u52a9\u6211\u4eec\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u505a\u51fa\u66f4\u5408\u7406\u7684\u9009\u62e9\u3002\u5e0c\u671b\u8fd9\u7bc7\u6587\u7ae0\u80fd\u8ba9\u4f60\u5bf9 ArrayList \u6709\u66f4\u6df1\u5165\u7684\u7406\u89e3\uff0c\u540e\u7eed\u6211\u8fd8\u4f1a\u5206\u4eab\u66f4\u591a Java \u96c6\u5408\u6846\u67b6\u7684\u6e90\u7801\u89e3\u6790\uff0c\u656c\u8bf7\u5173\u6ce8\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f5c\u4e3a Java \u96c6\u5408\u6846\u67b6\u4e2d\u6700\u5e38\u7528\u7684\u7c7b\u4e4b\u4e00\uff0cArrayList \u51ed\u501f\u5176\u52a8\u6001\u6269\u5bb9\u7684\u7279\u6027\u3001\u4fbf\u6377\u7684\u589e\u5220\u6539\u67e5\u64cd\u4f5c\uff0c\u6210\u4e3a\u65e5<\/p>\n<div class=\"more-link\">\n\t\t\t\t <a href=\"https:\/\/yunyanglib.cn\/?p=1308\" 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":841,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[15],"class_list":["post-1308","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\/1308","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=1308"}],"version-history":[{"count":4,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1308\/revisions"}],"predecessor-version":[{"id":1406,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1308\/revisions\/1406"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/media\/841"}],"wp:attachment":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1308"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1308"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1308"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}