{"id":643,"date":"2023-04-11T16:13:04","date_gmt":"2023-10-31T13:41:45","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e9%98%9f%e5%88%97-java%e4%b8%ad%e7%9a%84%e9%98%9f%e5%88%97\/"},"modified":"2025-08-03T00:37:37","modified_gmt":"2025-08-02T16:37:37","slug":"java%e9%98%9f%e5%88%97-java%e4%b8%ad%e7%9a%84%e9%98%9f%e5%88%97","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e9%98%9f%e5%88%97-java%e4%b8%ad%e7%9a%84%e9%98%9f%e5%88%97\/","title":{"rendered":"Java\u961f\u5217\u5b8c\u5168\u6307\u5357\uff1a\u539f\u7406\u3001\u5b9e\u73b0\u4e0e\u5e94\u7528\u573a\u666f\u8be6\u89e3"},"content":{"rendered":"<div>\n                            <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd1a4b2f92e6c72c625\/0-0.png\" class='post-images' alt=\"\" title=\"\"><\/p>\n<h3>Java \u961f\u5217<\/p>\n<p>\u5728\u8fd9\u4e00\u90e8\u5206\u4e2d\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u5173\u4e8eJava\u961f\u5217\u7684\u4e00\u4e9b\u91cd\u8981\u8981\u70b9\u3002<\/p>\n<ul class=\"post-ul\">\n<li>java.util.Queue interface is a subtype of java.util.Collection interface.<\/li>\n<li>Just like a real-world queue (for instance, in a bank or at ATM), Queue inserts elements at the end of the queue and removes from the beginning of the queue.<\/li>\n<li>Java Queue represents an ordered list of elements.<\/li>\n<li>Java Queue follows FIFO order to insert and remove it\u2019s elements. FIFO stands for First In First Out.<\/li>\n<li>Java Queue supports all methods of Collection interface.<\/li>\n<li>Most frequently used Queue implementations are LinkedList, ArrayBlockingQueue and PriorityQueue.<\/li>\n<li>BlockingQueues do not accept null elements. If we perform any null related operation, it throws NullPointerException.<\/li>\n<li>BlockingQueues are used to implement Producer\/Consumer based applications.<\/li>\n<li>BlockingQueues are thread-safe.<\/li>\n<li>All Queues which are available in java.util package are Unbounded Queues and Queues which are available in java.util.concurrent package are Bounded Queues.<\/li>\n<li>All Deques are not thread-safe.<\/li>\n<li>ConcurrentLinkedQueue is an unbounded thread-safe Queue based on linked nodes.<\/li>\n<li>All Queues supports insertion at the tail of the queue and removal at the head of the queue, except Deques.<\/li>\n<li>Deques are queues but they support element insertion and removal at both ends.<\/li>\n<\/ul>\n<div>\n                            <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd1a4b2f92e6c72c625\/4-0.png\" class='post-images' alt=\"\" title=\"\"><\/p>\n<h3>Java \u961f\u5217\u7c7b\u56fe<\/p>\n<div>\n                            <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd1a4b2f92e6c72c625\/6-0.jpg\" class='post-images' alt=\"\" title=\"\"><\/p>\n<h3>Java\u961f\u5217\u65b9\u6cd5<\/p>\n<p>\u5728\u8fd9\u4e00\u90e8\u5206\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u4e00\u4e9b\u6709\u7528\u4e14\u5e38\u7528\u7684Java\u961f\u5217\u65b9\u6cd5\u3002<\/p>\n<ol>\u83b7\u53d6Set\u4e2d\u5143\u7d20\u7684\u6570\u91cf\u3002<br \/>\n\u68c0\u67e5Set\u662f\u5426\u4e3a\u7a7a\u3002<br \/>\n\u5982\u679cSet\u5305\u542b\u6307\u5b9a\u7684\u5143\u7d20\uff0c\u5219\u8fd4\u56detrue\u3002<br \/>\n\u8fd4\u56de\u4e00\u4e2a\u904d\u5386Set\u4e2d\u5143\u7d20\u7684\u8fed\u4ee3\u5668\u3002\u5143\u7d20\u7684\u8fd4\u56de\u987a\u5e8f\u6ca1\u6709\u7279\u5b9a\u89c4\u5b9a\u3002<br \/>\n\u4eceSet\u4e2d\u79fb\u9664\u5305\u542b\u5728\u6307\u5b9a\u96c6\u5408\u4e2d\u7684\u6240\u6709\u5143\u7d20\uff08\u53ef\u9009\u64cd\u4f5c\uff09\u3002<br \/>\n\u4ec5\u4fdd\u7559Set\u4e2d\u5305\u542b\u5728\u6307\u5b9a\u96c6\u5408\u4e2d\u7684\u5143\u7d20\uff08\u53ef\u9009\u64cd\u4f5c\uff09\u3002<br \/>\n\u4eceSet\u4e2d\u5220\u9664\u6240\u6709\u5143\u7d20\u3002<br \/>\n\u68c0\u7d22\u5e76\u79fb\u9664\u8fd9\u4e2a\u961f\u5217\u7684\u5934\u90e8\u3002<br \/>\n\u68c0\u7d22\u5e76\u79fb\u9664\u8fd9\u4e2a\u961f\u5217\u7684\u5934\u90e8\uff0c\u5982\u679c\u8fd9\u4e2a\u961f\u5217\u4e3a\u7a7a\u5219\u8fd4\u56denull\u3002<br \/>\n\u68c0\u7d22\u4f46\u4e0d\u79fb\u9664\u8fd9\u4e2a\u961f\u5217\u7684\u5934\u90e8\uff0c\u5982\u679c\u8fd9\u4e2a\u961f\u5217\u4e3a\u7a7a\u5219\u8fd4\u56denull\u3002<br \/>\n\u5982\u679c\u7acb\u5373\u63d2\u5165\u6307\u5b9a\u5143\u7d20\u4e0d\u4f1a\u8fdd\u53cd\u5bb9\u91cf\u9650\u5236\uff0c\u5219\u5c06\u6307\u5b9a\u5143\u7d20\u63d2\u5165\u6b64\u961f\u5217\u3002<br \/>\n\u68c0\u7d22\u4f46\u4e0d\u79fb\u9664\u8fd9\u4e2a\u961f\u5217\u7684\u5934\u90e8\u3002<br \/>\n\u5982\u679c\u7acb\u5373\u63d2\u5165\u6307\u5b9a\u5143\u7d20\u4e0d\u4f1a\u8fdd\u53cd\u5bb9\u91cf\u9650\u5236\uff0c\u8fd4\u56detrue\u5e76\u5728\u6210\u529f\u63d2\u5165\u65f6\u629b\u51faIllegalStateException\u3002<br \/>\n\u8fd4\u56de\u4e00\u4e2a\u5305\u542bSet\u4e2d\u6240\u6709\u5143\u7d20\u7684\u6570\u7ec4\u3002\u5982\u679cSet\u5bf9\u5176\u8fed\u4ee3\u5668\u8fd4\u56de\u5143\u7d20\u7684\u987a\u5e8f\u6709\u4efb\u4f55\u4fdd\u8bc1\uff0c\u6b64\u65b9\u6cd5\u5fc5\u987b\u4ee5\u540c\u6837\u7684\u987a\u5e8f\u8fd4\u56de\u5143\u7d20\u3002<\/ol>\n<h3>Java \u961f\u5217\u57fa\u7840<\/p>\n<p>\u7531\u4e8eJava Queue\u7ee7\u627f\u4e86Java Collection\uff0c\u56e0\u6b64\u5b83\u4e5f\u652f\u6301\u6240\u6709Collection\u63a5\u53e3\u64cd\u4f5c\u3002\u8ba9\u6211\u4eec\u5728\u4e0b\u9762\u7684\u793a\u4f8b\u4e2d\u63a2\u7d22\u4e00\u4e9b\u7b80\u5355\u7684\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.queue;\r\nimport java.util.*;\r\n\r\npublic class QueueExample {\r\n   public static void main(String[] args) {\r\n\t\t\r\n\tQueue&lt;String&gt; queue = new LinkedList&lt;&gt;();\r\n\tqueue.add(\"one\");\r\n\tqueue.add(\"two\");\r\n\tqueue.add(\"three\");\r\n\tqueue.add(\"four\");\r\n\tSystem.out.println(queue);\r\n\t\t\r\n\tqueue.remove(\"three\");\r\n\tSystem.out.println(queue);\r\n\tSystem.out.println(\"Queue Size: \" + queue.size());\r\n\tSystem.out.println(\"Queue Contains element 'two' or not? : \" + queue.contains(\"two\"));\r\n\r\n\t\/\/ To empty the queue\r\n\tqueue.clear();\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>[one, two, three, four]\r\n[one, two, four]\r\nQueue Size: 3\r\nQueue Contains element 'two' or not? : true\r\n<\/code><\/pre>\n<h3>\u5c06Java\u6570\u7ec4\u8f6c\u6362\u4e3a\u961f\u5217<\/p>\n<p>\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u6765\u63a2\u7d22\u5982\u4f55\u4f7f\u7528\u201cCollections.addAll()\u201d\u65b9\u6cd5\u5c06Java\u6570\u7ec4\u8f6c\u6362\u4e3a\u961f\u5217\u3002<\/p>\n<pre class=\"post-pre\"><code>import java.util.*;\r\n\r\npublic class ArrayToQueue {\r\n    public static void main(String[] args) {\r\n\t\t\r\n\tString nums[] = {\"one\",\"two\",\"three\",\"four\",\"five\"};\r\n\tQueue&lt;String&gt; queue = new LinkedList&lt;&gt;();\r\n\tCollections.addAll(queue, nums);\r\n\tSystem.out.println(queue);\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u8fd0\u884c\u4e0a\u8ff0\u7a0b\u5e8f\u65f6\uff0c\u6211\u4eec\u5c06\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>[one, two, three, four, five]\r\n<\/code><\/pre>\n<h3>\u5c06Java\u961f\u5217\u8f6c\u6362\u4e3a\u6570\u7ec4\u3002<\/p>\n<p>\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u63a2\u8ba8\u5982\u4f55\u4f7f\u7528\u201ctoArray()\u201d\u65b9\u6cd5\u5c06Java\u961f\u5217\u8f6c\u6362\u4e3aJava\u6570\u7ec4\u3002<\/p>\n<pre class=\"post-pre\"><code>import java.util.*;\r\n\r\npublic class QueueToArray {\r\n   public static void main(String[] args) {\r\n\t\t\r\n\tQueue&lt;String&gt; queue = new LinkedList&lt;&gt;();\r\n\tqueue.add(\"one\");\r\n\tqueue.add(\"two\");\r\n\tqueue.add(\"three\");\r\n\tqueue.add(\"four\");\r\n\tqueue.add(\"five\");\r\n\t\t\r\n\tString strArray[] = queue.toArray(new String[queue.size()]);\r\n\tSystem.out.println(Arrays.toString(strArray)); \r\n\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u8fd0\u884c\u4ee5\u4e0a\u7a0b\u5e8f\u65f6\uff0c\u6211\u4eec\u5c06\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>[one, two, three, four, five]\r\n<\/code><\/pre>\n<h3>Java\u961f\u5217\u7684\u5e38\u89c1\u64cd\u4f5c<\/p>\n<p>Java\u961f\u5217\u652f\u6301Collection\u63a5\u53e3\u652f\u6301\u7684\u6240\u6709\u64cd\u4f5c\u4ee5\u53ca\u4e00\u4e9b\u5176\u4ed6\u64cd\u4f5c\u3002\u5b83\u4ee5\u4e24\u79cd\u5f62\u5f0f\u51e0\u4e4e\u652f\u6301\u6240\u6709\u64cd\u4f5c\u3002<\/p>\n<ul class=\"post-ul\">\n<li>One set of operations throws an exception if the operation fails.<\/li>\n<li>The other set of operations returns a special value if the operation fails.<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u8868\u683c\u7b80\u8981\u8bf4\u660e\u4e86\u6240\u6709\u961f\u5217\u7684\u5e38\u89c1\u64cd\u4f5c\u3002<\/p>\n<div>\n<div class=\"post-table\">\n<table>\n<thead>\n<tr>\n<th>Operation<\/th>\n<th>Throws exception<\/th>\n<th>Special value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Insert<\/td>\n<td>add(e)<\/td>\n<td>offer(e)<\/td>\n<\/tr>\n<tr>\n<td>Remove<\/td>\n<td>remove()<\/td>\n<td>poll()<\/td>\n<\/tr>\n<tr>\n<td>Examine<\/td>\n<td>element()<\/td>\n<td>peek()<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5728\u63a5\u4e0b\u6765\u7684\u7ae0\u8282\u4e2d\uff0c\u6211\u4eec\u4f1a\u9010\u4e00\u4ecb\u7ecd\u6bcf\u4e2a\u64cd\u4f5c\uff0c\u5e76\u4f7f\u7528\u4e00\u4e9b\u6709\u7528\u7684\u4f8b\u5b50\u8fdb\u884c\u8be6\u7ec6\u8ba8\u8bba\u3002<\/p>\n<h3>Java \u961f\u5217\u7684\u63d2\u5165\u64cd\u4f5c<\/p>\n<p>\u5728\u672c\u8282\u4e2d\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u8ba8\u8bbaJava\u961f\u5217\u7684\u63d2\u5165\u64cd\u4f5c\uff0c\u5e76\u63d0\u4f9b\u4e00\u4e9b\u6709\u7528\u7684\u793a\u4f8b\u3002\u5982\u679c\u6b64\u64cd\u4f5c\u6210\u529f\u6267\u884c\uff0c\u5b83\u5c06\u8fd4\u56de&#8221;true&#8221;\u503c\u3002\u6b63\u5982\u6211\u4eec\u6240\u77e5\uff0c\u961f\u5217\u652f\u6301\u4e24\u79cd\u5f62\u5f0f\u7684\u63d2\u5165\u64cd\u4f5c\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Queue.add(e):<br \/>\nIt throws an exception if the operation fails.-   Queue.offer(e):<br \/>\nIt returns a special value if the operation fails.<\/li>\n<\/ul>\n<p>\u8bf7\u6ce8\u610f\uff1a\u8fd9\u91cc\u7684\u7279\u6b8a\u503c\u53ef\u4ee5\u662f\u201cfalse\u201d\u6216\u201cnull\u201d\u3002<\/p>\n<h3>\u6392\u961f\u589e\u52a0()\u64cd\u4f5c<\/p>\n<p>\u4f7f\u7528add()\u64cd\u4f5c\u5c06\u65b0\u5143\u7d20\u63d2\u5165\u961f\u5217\u3002\u5982\u679c\u63d2\u5165\u64cd\u4f5c\u6210\u529f\uff0c\u5b83\u4f1a\u8fd4\u56de&#8221;true&#8221;\u503c\u3002\u5426\u5219\uff0c\u5b83\u4f1a\u629b\u51fajava.lang.IllegalStateException\u5f02\u5e38\u3002\u8ba9\u6211\u4eec\u5f00\u53d1\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u6765\u6f14\u793a\u8fd9\u4e2a\u529f\u80fd\u3002<\/p>\n<pre class=\"post-pre\"><code>import java.util.concurrent.*;\r\n\r\npublic class QueueAddOperation {\r\n   public static void main(String[] args) {\r\n\t\t\r\n\tBlockingQueue&lt;String&gt; queue = new ArrayBlockingQueue&lt;&gt;(2);\r\n\r\n\tSystem.out.println(queue.add(\"one\"));\r\n\tSystem.out.println(queue.add(\"two\"));\r\n\tSystem.out.println(queue);\r\n\tSystem.out.println(queue.add(\"three\"));\r\n\tSystem.out.println(queue);\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u8fd0\u884c\u4ee5\u4e0a\u7a0b\u5e8f\u65f6\uff0c\u6211\u4eec\u5c06\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>true\r\ntrue\r\n[one, two]\r\nException in thread \"main\" java.lang.IllegalStateException: Queue full\r\n<\/code><\/pre>\n<p>\u7531\u4e8e\u6211\u4eec\u7684\u961f\u5217\u4ec5\u9650\u4e8e\u4e24\u4e2a\u5143\u7d20\uff0c\u5f53\u6211\u4eec\u5c1d\u8bd5\u4f7f\u7528BlockingQueue.add()\u6dfb\u52a0\u7b2c\u4e09\u4e2a\u5143\u7d20\u65f6\uff0c\u5c31\u4f1a\u629b\u51fa\u4e0a\u8ff0\u5f02\u5e38\u3002<\/p>\n<h3>\u6392\u961f\u7684 offer() \u64cd\u4f5c<\/p>\n<p>offer()\u64cd\u4f5c\u7528\u4e8e\u5c06\u65b0\u5143\u7d20\u63d2\u5165\u961f\u5217\u3002\u5982\u679c\u6210\u529f\u6267\u884c\u63d2\u5165\u64cd\u4f5c\uff0c\u5b83\u5c06\u8fd4\u56de&#8221;true&#8221;\uff1b\u5426\u5219\uff0c\u5b83\u5c06\u8fd4\u56de&#8221;false&#8221;\u3002\u8ba9\u6211\u4eec\u5f00\u53d1\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u6765\u5c55\u793a\u8fd9\u4e2a\u529f\u80fd\u3002<\/p>\n<pre class=\"post-pre\"><code>import java.util.concurrent.*;\r\n\r\npublic class QueueOfferOperation {\r\n   public static void main(String[] args) {\r\n\t\t\r\n\tBlockingQueue&lt;String&gt; queue = new ArrayBlockingQueue&lt;&gt;(2);\r\n\r\n\tSystem.out.println(queue.offer(\"one\"));\r\n\tSystem.out.println(queue.offer(\"two\"));\r\n\tSystem.out.println(queue);\r\n\tSystem.out.println(queue.offer(\"three\"));\r\n\tSystem.out.println(queue);\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u8fd0\u884c\u4e0a\u8ff0\u7a0b\u5e8f\u65f6\uff0c\u6211\u4eec\u5c06\u83b7\u5f97\u5982\u4e0b\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>true\r\ntrue\r\n[one, two]\r\nfalse\r\n[one, two]\r\n<\/code><\/pre>\n<p>\u7531\u4e8e\u6211\u4eec\u7684\u961f\u5217\u9650\u5236\u4e86\u53ea\u80fd\u5305\u542b\u4e24\u4e2a\u5143\u7d20\uff0c\u5728\u6211\u4eec\u8bd5\u56fe\u4f7f\u7528BlockingQueue.offer()\u64cd\u4f5c\u6dfb\u52a0\u7b2c\u4e09\u4e2a\u5143\u7d20\u65f6\uff0c\u5b83\u8fd4\u56de\u4e86&#8221;false&#8221;\u503c\uff0c\u5c31\u50cf\u4e0a\u9762\u6240\u793a\u3002<\/p>\n<h3>Java \u961f\u5217\u7684\u5220\u9664\u64cd\u4f5c<\/p>\n<p>\u5728\u672c\u90e8\u5206\u4e2d\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u8ba8\u8bbaJava\u961f\u5217\u5220\u9664\u64cd\u4f5c\uff0c\u5e76\u63d0\u4f9b\u4e00\u4e9b\u6709\u7528\u7684\u793a\u4f8b\u3002\u5982\u679c\u5220\u9664\u6210\u529f\uff0c\u5220\u9664\u64cd\u4f5c\u5c06\u8fd4\u56de\u961f\u5217\u7684\u5934\u5143\u7d20\u3002\u6b63\u5982\u6211\u4eec\u6240\u77e5\uff0c\u961f\u5217\u652f\u6301\u4e24\u79cd\u5f62\u5f0f\u7684\u5220\u9664\u64cd\u4f5c\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>Queue.remove():<br \/>\nIt throws an exception if the operation fails.-   Queue.poll():<br \/>\nIt returns a special value if the operation fails.<\/li>\n<\/ul>\n<p>\u8bf7\u6ce8\u610f\uff1a\u8fd9\u91cc\u7279\u6b8a\u7684\u503c\u53ef\u4ee5\u662f\u201cfalse\u201d\u6216\u201cnull\u201d\u3002<\/p>\n<h3>\u961f\u5217\u7684\u79fb\u9664\u64cd\u4f5c<\/p>\n<p>remove\uff08\uff09\u64cd\u4f5c\u7528\u4e8e\u4ece\u961f\u5217\u7684\u5934\u90e8\u5220\u9664\u4e00\u4e2a\u5143\u7d20\u3002\u5982\u679c\u6210\u529f\u6267\u884c\u5220\u9664\u64cd\u4f5c\uff0c\u5219\u8fd4\u56de\u961f\u5217\u7684\u5934\u90e8\u5143\u7d20\u3002\u5426\u5219\uff0c\u5b83\u4f1a\u629b\u51fajava.util.NoSuchElementException\u5f02\u5e38\u3002\u8ba9\u6211\u4eec\u5f00\u53d1\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u6765\u6f14\u793a\u8fd9\u4e2a\u529f\u80fd\u3002<\/p>\n<pre class=\"post-pre\"><code>import java.util.*;\r\n\r\npublic class QueueRemoveOperation \r\n{\r\n   public static void main(String[] args) \r\n   {\t\t\r\n\tQueue&lt;String&gt; queue = new LinkedList&lt;&gt;();\r\n\tqueue.offer(\"one\");\r\n\tqueue.offer(\"two\");\t\t\r\n\tSystem.out.println(queue);\t\t\r\n\tSystem.out.println(queue.remove());\r\n\tSystem.out.println(queue.remove());\t\t\r\n\tSystem.out.println(queue.remove());\t\t\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u8fd0\u884c\u4e0a\u8ff0\u7a0b\u5e8f\u65f6\uff0c\u6211\u4eec\u5c06\u83b7\u5f97\u4ee5\u4e0b\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code>[one, two]\r\none\r\ntwo\r\nException in thread \"main\" java.util.NoSuchElementException\r\n<\/code><\/pre>\n<p>\u56e0\u4e3a\u961f\u5217\u53ea\u6709\u4e24\u4e2a\u5143\u7d20\uff0c\u5f53\u6211\u4eec\u5c1d\u8bd5\u7b2c\u4e09\u6b21\u8c03\u7528remove()\u65b9\u6cd5\u65f6\uff0c\u5b83\u4f1a\u629b\u51fa\u4e0a\u8ff0\u7684\u5f02\u5e38\u3002\u6ce8\u610f\uff1aQueue.remove(element)\u65b9\u6cd5\u7528\u4e8e\u4ece\u961f\u5217\u4e2d\u5220\u9664\u6307\u5b9a\u7684\u5143\u7d20\u3002\u5982\u679c\u5220\u9664\u6210\u529f\uff0c\u5b83\u4f1a\u8fd4\u56de\u201ctrue\u201d\u503c\uff0c\u5426\u5219\u8fd4\u56de\u201cfalse\u201d\u503c\u3002<\/p>\n<h3>\u961f\u5217\u7684poll()\u64cd\u4f5c<\/p>\n<p>\u4f7f\u7528poll()\u64cd\u4f5c\u4ece\u961f\u5217\u5934\u90e8\u5220\u9664\u4e00\u4e2a\u5143\u7d20\u3002\u5982\u679c\u6210\u529f\u6267\u884c\u5220\u9664\u64cd\u4f5c\uff0c\u5219\u8fd4\u56de\u961f\u5217\u7684\u5934\u5143\u7d20\u3002\u5426\u5219\u8fd4\u56de\u201cnull\u201d\u503c\u3002\u8ba9\u6211\u4eec\u5f00\u53d1\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u6765\u6f14\u793a\u8be5\u529f\u80fd\u3002<\/p>\n<pre class=\"post-pre\"><code>import java.util.*;\r\n\r\npublic class QueuePollOperation \r\n{\r\n   public static void main(String[] args) \r\n   {\t\t\r\n\tQueue&lt;String&gt; queue = new LinkedList&lt;&gt;();\r\n\tqueue.offer(\"one\");\r\n\tqueue.offer(\"two\");\t\t\r\n\tSystem.out.println(queue);\t\t\r\n\tSystem.out.println(queue.poll());\r\n\tSystem.out.println(queue.poll());\t\t\r\n\tSystem.out.println(queue.poll());\t\t\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u8fd0\u884c\u4e0a\u9762\u7684\u7a0b\u5e8f\u65f6\uff0c\u6211\u4eec\u4f1a\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code>[one, two]\r\none\r\ntwo\r\nnull\r\n<\/code><\/pre>\n<p>\u7531\u4e8e\u6211\u4eec\u7684\u961f\u5217\u53ea\u6709\u4e24\u4e2a\u5143\u7d20\uff0c\u5f53\u6211\u4eec\u5c1d\u8bd5\u7b2c\u4e09\u6b21\u8c03\u7528poll()\u65b9\u6cd5\u65f6\uff0c\u8fd4\u56de\u7684\u503c\u4e3anull\uff0c\u5982\u4e0a\u6240\u793a\u3002<\/p>\n<h3>Java\u961f\u5217\u68c0\u67e5\u64cd\u4f5c<\/p>\n<p>\u5728\u8fd9\u4e2a\u90e8\u5206\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u8ba8\u8bbaJava\u961f\u5217\u7684\u68c0\u67e5\u64cd\u4f5c\uff0c\u5e76\u9644\u4e0a\u4e00\u4e9b\u6709\u7528\u7684\u793a\u4f8b\u3002\u5982\u679c\u6b64\u64cd\u4f5c\u6210\u529f\u6267\u884c\uff0c\u5b83\u5c06\u8fd4\u56de\u961f\u5217\u7684\u5934\u5143\u7d20\u800c\u4e0d\u79fb\u9664\u5b83\u3002\u6b63\u5982\u6211\u4eec\u6240\u77e5\uff0c\u961f\u5217\u652f\u6301\u4e24\u79cd\u5f62\u5f0f\u7684\u68c0\u67e5\u64cd\u4f5c\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>Queue.element():<br \/>\nIt throws an exception if the operation fails.-   Queue.peek():<br \/>\nIt returns a special value if the operation fails.<\/li>\n<\/ul>\n<p>\u8bf7\u6ce8\u610f\uff1a\u8fd9\u91cc\u7684\u7279\u6b8a\u503c\u53ef\u4ee5\u662f\u201cfalse\u201d\u6216\u201cnull\u201d\u3002<\/p>\n<h3>\u961f\u5217\u7684\u5143\u7d20()\u64cd\u4f5c<\/p>\n<p>\u4f7f\u7528element\uff08\uff09\u64cd\u4f5c\u53ef\u4ee5\u4ece\u961f\u5217\u7684\u5934\u90e8\u68c0\u7d22\u4e00\u4e2a\u5143\u7d20\uff0c\u800c\u4e0d\u5c06\u5176\u79fb\u9664\u3002\u5982\u679c\u8fd0\u884c\u6210\u529f\u8fdb\u884c\u68c0\u67e5\u64cd\u4f5c\uff0c\u5219\u8fd4\u56de\u961f\u5217\u7684\u5934\u5143\u7d20\u3002\u5426\u5219\uff0c\u5b83\u4f1a\u629b\u51fajava.util.NoSuchElementException\u5f02\u5e38\u3002\u8ba9\u6211\u4eec\u5f00\u53d1\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u6765\u6f14\u793a\u8fd9\u4e2a\u529f\u80fd\u3002<\/p>\n<pre class=\"post-pre\"><code>import java.util.*;\r\n\r\npublic class QueueElementOperation {\r\n   public static void main(String[] args) {\r\n\t\t\r\n\tQueue&lt;String&gt; queue = new LinkedList&lt;&gt;();\r\n\tqueue.add(\"one\");\r\n\t\t\r\n\tSystem.out.println(queue.element());\r\n\tSystem.out.println(queue);\r\n\tqueue.clear();\r\n\tSystem.out.println(queue.element());\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a\u5f53\u6211\u4eec\u8fd0\u884c\u4e0a\u8ff0\u7a0b\u5e8f\u65f6\uff0c\u6211\u4eec\u5c06\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>one\r\n[one]\r\nException in thread \"main\" java.util.NoSuchElementException\r\n<\/code><\/pre>\n<p>\u5982\u679c\u6211\u4eec\u8bd5\u56fe\u5728\u7a7a\u961f\u5217\u4e0a\u8c03\u7528element()\u65b9\u6cd5\uff0c\u5c31\u4f1a\u50cf\u4e0a\u9762\u663e\u793a\u7684\u90a3\u6837\u629b\u51fa\u4e00\u4e2a\u5f02\u5e38\u3002<\/p>\n<h3>\u67e5\u8be2\u961f\u5217\u7684\u9876\u90e8\u5143\u7d20\u3002<\/p>\n<p>\u4f7f\u7528 peek() \u64cd\u4f5c\u53ef\u4ee5\u4ece\u961f\u5217\u5934\u90e8\u68c0\u7d22\u4e00\u4e2a\u5143\u7d20\uff0c\u800c\u4e0d\u5c06\u5176\u79fb\u9664\u3002\u5982\u679c\u68c0\u7d22\u64cd\u4f5c\u6210\u529f\uff0c\u5b83\u4f1a\u8fd4\u56de\u961f\u5217\u7684\u5934\u90e8\u5143\u7d20\u3002\u5426\u5219\uff0c\u8fd4\u56de null \u503c\u3002\u8ba9\u6211\u4eec\u5f00\u53d1\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u6765\u6f14\u793a\u8fd9\u4e2a\u529f\u80fd\u3002<\/p>\n<pre class=\"post-pre\"><code>import java.util.*;\r\n\r\npublic class QueuePeekOperation {\r\n   public static void main(String[] args) {\r\n\t\t\r\n\tQueue&lt;String&gt; queue = new LinkedList&lt;&gt;();\r\n\tqueue.add(\"one\");\r\n\t\t\r\n\tSystem.out.println(queue.peek());\r\n\tSystem.out.println(queue);\r\n\tqueue.clear();\r\n\tSystem.out.println(queue.peek());\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u8fd0\u884c\u4ee5\u4e0a\u7a0b\u5e8f\u65f6\uff0c\u6211\u4eec\u4f1a\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\u3002<\/p>\n<pre class=\"post-pre\"><code>one\r\n[one]\r\nnull\r\n<\/code><\/pre>\n<p>\u5982\u679c\u6211\u4eec\u5728\u7a7a\u961f\u5217\u4e0a\u5c1d\u8bd5\u8c03\u7528peek()\u65b9\u6cd5\uff0c\u5b83\u4f1a\u8fd4\u56denull\u503c\uff0c\u4f46\u662f\u4e0d\u4f1a\u50cf\u4e0a\u9762\u90a3\u6837\u629b\u51fa\u5f02\u5e38\u3002<\/p>\n<h3>Java\u961f\u5217\u5206\u7c7b<\/p>\n<p>\u5728Java\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u627e\u5230\u8bb8\u591a\u961f\u5217\u5b9e\u73b0\u3002\u6211\u4eec\u53ef\u4ee5\u5c06\u5b83\u4eec\u5e7f\u6cdb\u5206\u4e3a\u4ee5\u4e0b\u4e24\u79cd\u7c7b\u578b<\/p>\n<ul class=\"post-ul\">\n<li>\u6709\u754c\u961f\u5217<\/li>\n<li>\u65e0\u754c\u961f\u5217<\/li>\n<\/ul>\n<p>\u6709\u754c\u961f\u5217\u662f\u901a\u8fc7\u5bb9\u91cf\u9650\u5236\u7684\u961f\u5217\uff0c\u8fd9\u610f\u5473\u7740\u6211\u4eec\u9700\u8981\u5728\u521b\u5efa\u65f6\u63d0\u4f9b\u961f\u5217\u7684\u6700\u5927\u5bb9\u91cf\u5927\u5c0f\u3002\u4f8b\u5982ArrayBlockingQueue\uff08\u89c1\u4e4b\u524d\u7684\u793a\u4f8b\uff09\u3002\u65e0\u754c\u961f\u5217\u662f\u6ca1\u6709\u5bb9\u91cf\u9650\u5236\u7684\u961f\u5217\uff0c\u8fd9\u610f\u5473\u7740\u6211\u4eec\u4e0d\u9700\u8981\u63d0\u4f9b\u961f\u5217\u7684\u5927\u5c0f\u3002\u4f8b\u5982LinkedList\uff08\u89c1\u4e4b\u524d\u7684\u793a\u4f8b\uff09\u3002\u6240\u6709\u5728java.util\u5305\u4e2d\u53ef\u7528\u7684\u961f\u5217\u90fd\u662f\u65e0\u754c\u961f\u5217\uff0c\u800c\u5728java.util.concurrent\u5305\u4e2d\u53ef\u7528\u7684\u961f\u5217\u90fd\u662f\u6709\u754c\u961f\u5217\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u6211\u4eec\u53ef\u4ee5\u5e7f\u6cdb\u5c06\u5b83\u4eec\u5f52\u7c7b\u4e3a\u4ee5\u4e0b\u4e24\u79cd\u7c7b\u578b\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u963b\u585e\u961f\u5217<\/li>\n<li>\u975e\u963b\u585e\u961f\u5217<\/li>\n<\/ul>\n<p>\u6240\u6709\u5b9e\u73b0BlockingQueue\u63a5\u53e3\u7684\u961f\u5217\u90fd\u662f\u963b\u585e\u961f\u5217\uff0c\u5176\u4f59\u7684\u961f\u5217\u90fd\u662f\u975e\u963b\u585e\u961f\u5217\u3002\u963b\u585e\u961f\u5217\u4f1a\u5728\u5b8c\u6210\u4efb\u52a1\u6216\u8d85\u65f6\u524d\u4e00\u76f4\u963b\u585e\uff0c\u800c\u975e\u963b\u585e\u961f\u5217\u5219\u4e0d\u4f1a\u3002\u4e00\u4e9b\u961f\u5217\u662f\u53cc\u7aef\u961f\u5217\uff0c\u800c\u53e6\u4e00\u4e9b\u961f\u5217\u662f\u4f18\u5148\u7ea7\u961f\u5217\u3002<\/p>\n<h3>\u963b\u585e\u961f\u5217\u7684\u64cd\u4f5c<\/h3>\n<p>\u9664\u4e86Queue\u7684\u4e24\u79cd\u64cd\u4f5c\u5f62\u5f0f\u5916\uff0cBlockingQueue\u8fd8\u652f\u6301\u4e0b\u9762\u4e24\u79cd\u5f62\u5f0f\u7684\u64cd\u4f5c\u3002<\/p>\n<div>\n<div class=\"post-table\">\n<table>\n<thead>\n<tr>\n<th>\u64cd\u4f5c<\/th>\n<th>\u629b\u51fa\u5f02\u5e38<\/th>\n<th>\u7279\u6b8a\u503c<\/th>\n<th>\u963b\u585e<\/th>\n<th>\u8d85\u65f6<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u63d2\u5165<\/td>\n<td>add(e)<\/td>\n<td>offer(e)<\/td>\n<td>put(e)<\/td>\n<td>offer(e, time, unit)<\/td>\n<\/tr>\n<tr>\n<td>\u79fb\u9664<\/td>\n<td>remove()<\/td>\n<td>poll()<\/td>\n<td>take()<\/td>\n<td>poll(time, unit)<\/td>\n<\/tr>\n<tr>\n<td>\u68c0\u67e5<\/td>\n<td>element()<\/td>\n<td>peek()<\/td>\n<td>N\/A<\/td>\n<td>N\/A<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n<p>\u4e00\u4e9b\u64cd\u4f5c\u5728\u5b8c\u6210\u5176\u5de5\u4f5c\u4e4b\u524d\u4f1a\u88ab\u963b\u585e\uff0c\u800c\u5176\u4ed6\u64cd\u4f5c\u5219\u4f1a\u5728\u8d85\u65f6\u4e4b\u524d\u88ab\u963b\u585e\u3002\u8fd9\u5c31\u662f\u5173\u4e8eJava\u4e2d\u961f\u5217\u7684\u7b80\u8981\u6982\u8ff0\u3002\u5e0c\u671b\u8fd9\u4e9bJava\u961f\u5217\u793a\u4f8b\u80fd\u5e2e\u52a9\u4f60\u5165\u95e8\u961f\u5217\u96c6\u5408\u7f16\u7a0b\u3002\u5982\u679c\u4f60\u559c\u6b22\u6211\u7684\u6559\u7a0b\uff0c\u6709\u4efb\u4f55\u5efa\u8bae\u3001\u95ee\u9898\u6216\u6253\u5b57\u9519\u8bef\uff0c\u8bf7\u7ed9\u6211\u7559\u8a00\u3002\u8c22\u8c22\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u961f\u5217 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