{"id":10006885,"date":"2022-11-22T06:05:45","date_gmt":"2022-11-21T22:05:45","guid":{"rendered":"https:\/\/ityet.com\/?p=10006885"},"modified":"2022-11-22T06:05:45","modified_gmt":"2022-11-21T22:05:45","slug":"%e4%b8%87%e5%ad%97%e8%af%a6%e8%a7%a3-java-%e7%ba%bf%e7%a8%8b%e5%ae%89%e5%85%a8%ef%bc%8c%e9%9d%a2%e8%af%95%e5%bf%85%e5%a4%87%ef%bc%81","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006885","title":{"rendered":"\u4e07\u5b57\u8be6\u89e3 Java \u7ebf\u7a0b\u5b89\u5168\uff0c\u9762\u8bd5\u5fc5\u5907\uff01"},"content":{"rendered":"<p>\u6765\u6e90\uff1ablog.csdn.net\/u014454538\/article\/details\/98515807<\/p>\n<h2>1. Java\u4e2d\u7684\u7ebf\u7a0b\u5b89\u5168<\/h2>\n<ul>\n<li>Java\u7ebf\u7a0b\u5b89\u5168\uff1a\u72ed\u4e49\u5730\u8ba4\u4e3a\u662f\u591a\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\u6570\u636e\u7684\u8bbf\u95ee\u3002<\/li>\n<li>Java\u8bed\u8a00\u4e2d\u5404\u79cd\u64cd\u4f5c\u5171\u4eab\u7684\u6570\u636e\u67095\u79cd\u7c7b\u578b\uff1a\u4e0d\u53ef\u53d8\u3001\u7edd\u5bf9\u7ebf\u7a0b\u5b89\u5168\u3001\u76f8\u5bf9\u7ebf\u7a0b\u5b89\u5168\u3001\u7ebf\u7a0b\u517c\u5bb9\u3001\u7ebf\u7a0b\u72ec\u7acb<\/li>\n<\/ul>\n<h3>\u2460 \u4e0d\u53ef\u53d8<\/h3>\n<ul>\n<li>\u4e0d\u53ef\u53d8\uff08Immutable\uff09 \u7684\u5bf9\u8c61\u4e00\u5b9a\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u4e0d\u9700\u8981\u518d\u91c7\u53d6\u4efb\u4f55\u7684\u7ebf\u7a0b\u5b89\u5168\u4fdd\u969c\u63aa\u65bd\u3002<\/li>\n<li>\u53ea\u8981\u80fd\u6b63\u786e\u6784\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u6c38\u8fdc\u4e0d\u4f1a\u5728\u591a\u4e2a\u7ebf\u7a0b\u4e4b\u95f4\u51fa\u73b0\u4e0d\u4e00\u81f4\u7684\u72b6\u6001\u3002<\/li>\n<li>\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u5e94\u5f53\u5c3d\u91cf\u4f7f\u5bf9\u8c61\u6210\u4e3a\u4e0d\u53ef\u53d8\uff0c\u6765\u6ee1\u8db3\u7ebf\u7a0b\u5b89\u5168\u3002<\/li>\n<\/ul>\n<p><strong>\u5982\u4f55\u5b9e\u73b0\u4e0d\u53ef\u53d8\uff1f<\/strong><\/p>\n<ul>\n<li>\u5982\u679c\u5171\u4eab\u6570\u636e\u662f\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u4f7f\u7528final\u5173\u952e\u5b57\u5bf9\u5176\u8fdb\u884c\u4fee\u9970\uff0c\u5c31\u53ef\u4ee5\u4fdd\u8bc1\u5b83\u662f\u4e0d\u53ef\u53d8\u7684\u3002<\/li>\n<li>\u5982\u679c\u5171\u4eab\u6570\u636e\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u8981\u4fdd\u8bc1\u5bf9\u8c61\u7684\u884c\u4e3a\u4e0d\u4f1a\u5bf9\u5176\u72b6\u6001\u4ea7\u751f\u4efb\u4f55\u5f71\u54cd\u3002<\/li>\n<li>String\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u5bf9\u5176\u8fdb\u884csubstring()\u3001replace()\u3001concat()\u7b49\u64cd\u4f5c\uff0c\u8fd4\u56de\u7684\u662f\u65b0\u7684String\u5bf9\u8c61\uff0c\u539f\u59cb\u7684String\u5bf9\u8c61\u7684\u503c\u4e0d\u53d7\u5f71\u54cd\u3002\u800c\u5982\u679c\u5bf9StringBuffer\u6216\u8005StringBuilder\u5bf9\u8c61\u8fdb\u884csubstring()\u3001replace()\u3001append()\u7b49\u64cd\u4f5c\uff0c\u76f4\u63a5\u5bf9\u539f\u5bf9\u8c61\u7684\u503c\u8fdb\u884c\u6539\u53d8\u3002<\/li>\n<li>\u8981\u6784\u5efa\u4e0d\u53ef\u53d8\u5bf9\u8c61\uff0c\u9700\u8981\u5c06\u5185\u90e8\u72b6\u6001\u53d8\u91cf\u5b9a\u4e49\u4e3afinal\u7c7b\u578b\u3002\u5982<code>java.lang.Integer<\/code>\u7c7b\u4e2d\u5c06value\u5b9a\u4e49\u4e3afinal\u7c7b\u578b\u3002<\/li>\n<\/ul>\n<p>Java \u9762\u8bd5\u9898\u6700\u5168\u6574\u7406\uff1a<a href=\"https:\/\/link.segmentfault.com\/?enc=iRyIEXTFqN3HViub9TmAuA%3D%3D.GJyPFnHJkk5%2FaY%2F0qkYaP7RbeEvxlMg4ugnSXhutjDA%3D\" rel=\"nofollow\">https:\/\/www.javastack.cn\/mst\/<\/a><\/p>\n<pre><code>private final int value;<\/code><\/pre>\n<p><strong>\u5e38\u89c1\u7684\u4e0d\u53ef\u53d8\u7684\u7c7b\u578b\uff1a<\/strong><\/p>\n<ul>\n<li>final\u5173\u952e\u5b57\u4fee\u9970\u7684\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/li>\n<li>\u679a\u4e3e\u7c7b\u578b\u3001String\u7c7b\u578b<\/li>\n<li>\u5e38\u89c1\u7684\u5305\u88c5\u7c7b\u578b\uff1aShort\u3001Integer\u3001Long\u3001Float\u3001Double\u3001Byte\u3001Character\u7b49<\/li>\n<li>\u5927\u6570\u636e\u7c7b\u578b\uff1aBigInteger\u3001BigDecimal<\/li>\n<\/ul>\n<blockquote><p>\u6ce8\u610f\uff1a\u539f\u5b50\u7c7b AtomicInteger \u548c AtomicLong \u5219\u662f\u53ef\u53d8\u7684\u3002<\/p><\/blockquote>\n<p>\u5bf9\u4e8e\u96c6\u5408\u7c7b\u578b\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>Collections.unmodifiableXXX()<\/code> \u65b9\u6cd5\u6765\u83b7\u53d6\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u96c6\u5408\u3002<\/p>\n<ul>\n<li>\u901a\u8fc7<code>Collections.unmodifiableMap(map)<\/code>\u83b7\u7684\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684Map\u7c7b\u578b\u3002<\/li>\n<li><code>Collections.unmodifiableXXX()<\/code> \u5148\u5bf9\u539f\u59cb\u7684\u96c6\u5408\u8fdb\u884c\u62f7\u8d1d\uff0c\u9700\u8981\u5bf9\u96c6\u5408\u8fdb\u884c\u4fee\u6539\u7684\u65b9\u6cd5\u90fd\u76f4\u63a5\u629b\u51fa\u5f02\u5e38\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u83b7\u5f97\u7684\u4e0d\u53ef\u53d8map\u5bf9\u8c61\u8fdb\u884cput()\u3001remove()\u3001clear()\u64cd\u4f5c\uff0c\u5219\u4f1a\u629b\u51faUnsupportedOperationException\u5f02\u5e38\u3002<\/p>\n<h3>\u2461 \u7edd\u5bf9\u7ebf\u7a0b\u5b89\u5168<\/h3>\n<p>\u7edd\u5bf9\u7ebf\u7a0b\u5b89\u5168\u7684\u5b9e\u73b0\uff0c\u901a\u5e38\u9700\u8981\u4ed8\u51fa\u5f88\u5927\u7684\u3001\u751a\u81f3\u4e0d\u5207\u5b9e\u9645\u7684\u4ee3\u4ef7\u3002<\/p>\n<p>Java API\u4e2d\u63d0\u4f9b\u7684\u7ebf\u7a0b\u5b89\u5168\uff0c\u5927\u591a\u6570\u90fd\u4e0d\u662f\u7edd\u5bf9\u7ebf\u7a0b\u5b89\u5168\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5bf9\u4e8e\u6570\u7ec4\u96c6\u5408Vector\u7684\u64cd\u4f5c\uff0c\u5982get()\u3001add()\u3001remove()\u90fd\u662f\u6709synchronized\u5173\u952e\u5b57\u4fee\u9970\u3002\u6709\u65f6\u8c03\u7528\u65f6\u4e5f\u9700\u8981\u624b\u52a8\u6dfb\u52a0\u540c\u6b65\u624b\u6bb5\uff0c\u4fdd\u8bc1\u591a\u7ebf\u7a0b\u7684\u5b89\u5168\u3002<\/p>\n<p>\u4e0b\u9762\u7684\u4ee3\u7801\u770b\u4f3c\u4e0d\u9700\u8981\u540c\u6b65\uff0c\u5b9e\u9645\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u4f1a\u62a5\u9519\u3002<\/p>\n<pre><code>import java.util.Vector;\n\n\/**\n * @Author: lucy\n * @Version 1.0\n *\/\npublic class VectorTest {\n    public static void main(String[] args) {\n        Vector&lt;Integer&gt; vector = new Vector&lt;&gt;();\n        while(true){\n            for (int i = 0; i &lt; 10; i++) {\n                vector.add(i);\n            }\n            new Thread(new Runnable() {\n                @Override\n                public void run() {\n                    for (int i = 0; i &lt; vector.size(); i++) {\n                        System.out.println(&quot;\u83b7\u53d6vector\u7684\u7b2c&quot; + i + &quot;\u4e2a\u5143\u7d20: &quot; + vector.get(i));\n                    }\n                }\n            }).start();\n            new Thread(new Runnable() {\n                @Override\n                public void run() {\n                    for (int i=0;i&lt;vector.size();i++){\n                        System.out.println(&quot;\u5220\u9664vector\u4e2d\u7684\u7b2c&quot; + i+&quot;\u4e2a\u5143\u7d20&quot;);\n                        vector.remove(i);\n                    }\n                }\n            }).start();\n            while (Thread.activeCount()&gt;20)\n                return;\n        }\n    }\n}<\/code><\/pre>\n<p>\u51fa\u73b0<code>ArrayIndexOutOfBoundsException<\/code>\u5f02\u5e38\uff0c\u539f\u56e0\uff1a\u67d0\u4e2a\u7ebf\u7a0b\u6070\u597d\u5220\u9664\u4e86\u5143\u7d20i\uff0c\u4f7f\u5f97\u5f53\u524d\u7ebf\u7a0b\u65e0\u6cd5\u8bbf\u95ee\u5143\u7d20i\u3002<\/p>\n<pre><code>Exception in thread &quot;Thread-1109&quot; java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 1\n at java.util.Vector.remove(Vector.java:831)\n at VectorTest$2.run(VectorTest.java:28)\n at java.lang.Thread.run(Thread.java:745)<\/code><\/pre>\n<p>\u9700\u8981\u5c06\u5bf9\u5143\u7d20\u7684get\u548cremove\u6784\u9020\u6210\u540c\u6b65\u4ee3\u7801\u5757\uff1a<\/p>\n<pre><code>synchronized (vector){\n    for (int i = 0; i &lt; vector.size(); i++) {\n        System.out.println(&quot;\u83b7\u53d6vector\u7684\u7b2c&quot; + i + &quot;\u4e2a\u5143\u7d20: &quot; + vector.get(i));\n    }\n}\nsynchronized (vector){\n    for (int i=0;i&lt;vector.size();i++){\n        System.out.println(&quot;\u5220\u9664vector\u4e2d\u7684\u7b2c&quot; + i+&quot;\u4e2a\u5143\u7d20&quot;);\n        vector.remove(i);\n    }\n}<\/code><\/pre>\n<h3>\u2462 \u76f8\u5bf9\u7ebf\u7a0b\u5b89\u5168<\/h3>\n<ul>\n<li>\u76f8\u5bf9\u7ebf\u7a0b\u5b89\u5168\u9700\u8981\u4fdd\u8bc1\u5bf9\u8be5\u5bf9\u8c61\u7684\u5355\u4e2a\u64cd\u4f5c\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u5728\u5fc5\u8981\u7684\u65f6\u5019\u53ef\u4ee5\u4f7f\u7528\u540c\u6b65\u63aa\u65bd\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u3002<\/li>\n<li>\u5927\u90e8\u5206\u7684\u7ebf\u7a0b\u5b89\u5168\u7c7b\u90fd\u5c5e\u4e8e\u76f8\u5bf9\u7ebf\u7a0b\u5b89\u5168\uff0c\u5982Java\u5bb9\u5668\u4e2d\u7684Vector\u3001HashTable\u3001\u901a\u8fc7<code>Collections.synchronizedXXX()<\/code>\u65b9\u6cd5\u5305\u88c5\u7684\u96c6\u5408\u3002<\/li>\n<\/ul>\n<h3>\u2463 \u7ebf\u7a0b\u517c\u5bb9<\/h3>\n<ul>\n<li>Java\u4e2d\u5927\u90e8\u5206\u7684\u7c7b\u90fd\u662f\u7ebf\u7a0b\u517c\u5bb9\u7684\uff0c\u901a\u8fc7\u6dfb\u52a0\u540c\u6b65\u63aa\u65bd\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u5b89\u5168\u4f7f\u7528\u8fd9\u4e9b\u7c7b\u7684\u5bf9\u8c61\u3002<\/li>\n<li>\u5982\u5e38\u89c1\u7684ArrayList\u3001HashTableMap\u90fd\u662f\u7ebf\u7a0b\u517c\u5bb9\u7684\u3002<\/li>\n<\/ul>\n<h3>\u2464 \u7ebf\u7a0b\u5bf9\u7acb<\/h3>\n<ul>\n<li>\u7ebf\u7a0b\u5bf9\u7acb\u662f\u6307\uff1a\u65e0\u6cd5\u901a\u8fc7\u6dfb\u52a0\u540c\u6b65\u63aa\u65bd\uff0c\u5b9e\u73b0\u591a\u7ebf\u7a0b\u4e2d\u7684\u5b89\u5168\u4f7f\u7528\u3002<\/li>\n<li>\u7ebf\u7a0b\u5bf9\u7acb\u7684\u5e38\u89c1\u64cd\u4f5c\u6709\uff1aThread\u7c7b\u7684suspend()\u548cresume()\uff08\u5df2\u7ecf\u88abJDK\u58f0\u660e\u5e9f\u9664\uff09\uff0c<code>System.setIn()<\/code>\u548c<code>System.setOut()<\/code>\u7b49\u3002<\/li>\n<\/ul>\n<h2>2. Java\u7684\u679a\u4e3e\u7c7b\u578b<\/h2>\n<p>\u901a\u8fc7enum\u5173\u952e\u5b57\u4fee\u9970\u7684\u6570\u636e\u7c7b\u578b\uff0c\u53eb\u679a\u4e3e\u7c7b\u578b\u3002<\/p>\n<ul>\n<li>\u679a\u4e3e\u7c7b\u578b\u7684\u6bcf\u4e2a\u5143\u7d20\u90fd\u6709\u81ea\u5df1\u7684\u5e8f\u53f7\uff0c\u901a\u5e38\u4ece0\u5f00\u59cb\u7f16\u53f7\u3002<\/li>\n<li>\u53ef\u4ee5\u901a\u8fc7values()\u65b9\u6cd5\u904d\u5386\u679a\u4e3e\u7c7b\u578b\uff0c\u901a\u8fc7name()\u6216\u8005toString()\u83b7\u53d6\u679a\u4e3e\u7c7b\u578b\u7684\u540d\u79f0<\/li>\n<li>\u901a\u8fc7ordinal()\u65b9\u6cd5\u83b7\u53d6\u679a\u4e3e\u7c7b\u578b\u4e2d\u5143\u7d20\u7684\u5e8f\u53f7<\/li>\n<\/ul>\n<pre><code>public class EnumData {\n    public static void main(String[] args) {\n        for (Family family : Family.values()) {\n            System.out.println(family.name() + &quot;\uff1a&quot; + family.ordinal());\n        }\n    }\n}\n\nenum Family {\n    GRADMOTHER, GRANDFATHER, MOTHER, FATHER, DAUGHTER, SON;\n}<\/code><\/pre>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc3Zlp\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u53ef\u4ee5\u5c06\u679a\u4e3e\u7c7b\u578b\u770b\u505a\u666e\u901a\u7684class\uff0c\u5728\u91cc\u9762\u5b9a\u4e49final\u7c7b\u578b\u7684\u6210\u5458\u53d8\u91cf\uff0c\u4fbf\u53ef\u4ee5\u4e3a\u679a\u4e3e\u7c7b\u578b\u4e2d\u7684\u5143\u7d20\u8d4b\u521d\u503c\u3002<\/p>\n<p>\u8981\u60f3\u83b7\u53d6\u679a\u4e3e\u7c7b\u578b\u4e2d\u5143\u7d20\u5b9e\u9645\u503c\uff0c\u9700\u8981\u4e3a\u6210\u5458\u53d8\u91cf\u6dfb\u52a0getter\u65b9\u6cd5\u3002<\/p>\n<p>\u867d\u7136\u679a\u4e3e\u7c7b\u578b\u7684\u5143\u7d20\u6709\u4e86\u81ea\u5df1\u7684\u5b9e\u9645\u503c\uff0c\u4f46\u662f\u901a\u8fc7ordinal()\u65b9\u6cd5\u83b7\u53d6\u7684\u5143\u7d20\u5e8f\u53f7\u4e0d\u4f1a\u53d1\u751f\u6539\u53d8\u3002<\/p>\n<pre><code>public class EnumData {\n    public static void main(String[] args) {\n        for (Family family : Family.values()) {\n            System.out.println(family.name() + &quot;\uff1a\u5b9e\u9645\u503c&quot; + family.getValue() +\n                    &quot;, \u5b9e\u9645\u5e8f\u53f7&quot; + family.ordinal());\n        }\n    }\n}\nenum Family {\n    GRADMOTHER(3), GRANDFATHER(4), MOTHER(1), FATHER(2), DAUGHTER(5), SON(6);\n    private final int value;\n    Family(int value) {\n        this.value = value;\n    }\n    public int getValue() {\n        return value;\n    }\n}<\/code><\/pre>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc3Zlq\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<h2>3. Java\u7ebf\u7a0b\u5b89\u5168\u7684\u5b9e\u73b0<\/h2>\n<h3>\u2460 \u4e92\u65a5\u540c\u6b65<\/h3>\n<p>\u4e92\u65a5\u540c\u6b65\uff08Mutex Exclusion &#038; Synchronization\uff09\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u5e76\u53d1\u6b63\u786e\u6027\u4fdd\u969c\u624b\u6bb5\u3002<\/p>\n<ul>\n<li>\u540c\u6b65\uff1a\u591a\u4e2a\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95ee\u5171\u4eab\u6570\u636e\uff0c\u4fdd\u8bc1\u5171\u4eab\u6570\u636e\u540c\u4e00\u65f6\u523b\u53ea\u88ab\u4e00\u4e2a\uff08\u6216\u8005\u4e00\u4e9b\uff0c\u4f7f\u7528\u4fe1\u53f7\u91cf\uff09\u7ebf\u7a0b\u4f7f\u7528\u3002<\/li>\n<li>\u4e92\u65a5\uff1a\u4e92\u65a5\u662f\u5b9e\u73b0\u540c\u6b65\u7684\u4e00\u79cd\u624b\u6bb5\uff0c\u4e3b\u8981\u7684\u4e92\u65a5\u5b9e\u73b0\u65b9\u5f0f\uff1a\u4e34\u754c\u533a\uff08Critical Section\uff09\u3001\u4e92\u65a5\u91cf\uff08Mutex\uff09\u3001\u4fe1\u53f7\u91cf\uff08Semaphore\uff09\u3002<\/li>\n<\/ul>\n<p><strong>\u540c\u6b65\u4e0e\u4e92\u65a5\u7684\u5173\u7cfb\uff1a<\/strong><\/p>\n<ul>\n<li>\u4e92\u65a5\u662f\u539f\u56e0\uff0c\u540c\u6b65\u662f\u7ed3\u679c\u3002<\/li>\n<li>\u540c\u6b65\u662f\u76ee\u7684\uff0c\u4e92\u65a5\u662f\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n<p>Java\u4e2d\uff0c\u6700\u57fa\u672c\u7684\u5b9e\u73b0\u4e92\u65a5\u540c\u6b65\u7684\u624b\u6bb5\u662fsynchronized\u5173\u952e\u5b57\uff0c\u5176\u6b21\u662fJUC\u5305\u4e2d\u7684ReentrantLock\u3002<\/p>\n<p><strong>\u5173\u4e8esynchronized\u5173\u952e\u5b57\uff1a<\/strong><\/p>\n<ul>\n<li>\u7f16\u8bd1\u540e\u7684\u540c\u6b65\u5757\uff0c\u5f00\u59cb\u5904\u4f1a\u6dfb\u52a0monitorenter\u6307\u4ee4\uff0c\u7ed3\u675f\u5904\u6216\u5f02\u5e38\u5904\u4f1a\u6dfb\u52a0monitorexit\u6307\u4ee4\u3002<\/li>\n<li>monitorenter\u548cmonitorexit\u6307\u4ee4\u4e2d\u90fd\u5305\u542b\u4e00\u4e2a\u5f15\u7528\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u5206\u522b\u6307\u5411\u52a0\u9501\u6216\u89e3\u9501\u7684\u5bf9\u8c61\u3002\u5982\u679c\u662f\u540c\u6b65\u4ee3\u7801\u5757\uff0c\u5219\u4e3asynchronized\u62ec\u53f7\u4e2d\u660e\u786e\u6307\u5b9a\u7684\u5bf9\u8c61\uff1b\u5982\u679c\u4e3a\u666e\u901a\u65b9\u6cd5\uff0c\u5219\u4e3a\u5f53\u524d\u5b9e\u4f8b\u5bf9\u8c61\uff1b\u5982\u679c\u4e3a\u9759\u6001\u65b9\u6cd5\uff0c\u5219\u4e3a\u7c7b\u5bf9\u5e94\u7684class\u5bf9\u8c61\u3002<\/li>\n<li>JVM\u6267\u884cmonitorenter\u6307\u4ee4\u65f6\uff0c\u8981\u5148\u5c1d\u8bd5\u83b7\u53d6\u9501\uff1a\u5982\u679c\u5bf9\u8c61\u6ca1\u88ab\u9501\u5b9a\u6216\u8005\u5f53\u524d\u7ebf\u7a0b\u5df2\u7ecf\u62e5\u6709\u8be5\u5bf9\u8c61\u7684\u9501\uff0c\u5219\u9501\u8ba1\u6570\u5668\u52a01\uff1b\u5426\u5219\u83b7\u53d6\u9501\u5931\u8d25\uff0c\u8fdb\u5165\u963b\u585e\u72b6\u6001\uff0c\u7b49\u5f85\u6301\u6709\u9501\u7684\u7ebf\u7a0b\u91ca\u653e\u9501\u3002<\/li>\n<li>JVM\u6267\u884cmonitorexit\u6307\u4ee4\u65f6\uff0c\u9501\u8ba1\u6570\u5668\u51cf1\uff0c\u76f4\u5230\u8ba1\u6570\u5668\u7684\u503c\u4e3a0\uff0c\u9501\u88ab\u91ca\u653e\u3002\uff08synchronized\u662f\u652f\u6301\u91cd\u8fdb\u5165\u7684\uff09<\/li>\n<li>\u7531\u4e8e\u963b\u585e\u6216\u8005\u5524\u9192\u7ebf\u7a0b\u90fd\u9700\u8981\u4ece\u7528\u6237\u6001\uff08User Mode\uff09\u5207\u6362\u5230\u6838\u5fc3\u6001\uff08Kernel Mode\uff09\uff0c\u6709\u65f6\u9501\u53ea\u4f1a\u88ab\u6301\u6709\u5f88\u77ed\u7684\u65f6\u95f4\uff0c\u6ca1\u6709\u5fc5\u8981\u8fdb\u884c\u72b6\u6001\u8f6c\u6362\u3002\u53ef\u4ee5\u8ba9\u7ebf\u7a0b\u5728\u963b\u585e\u4e4b\u524d\u5148\u81ea\u65cb\u7b49\u5f85\u4e00\u6bb5\u65f6\u95f4\uff0c\u8d85\u65f6\u672a\u83b7\u53d6\u5230\u9501\u624d\u8fdb\u5165\u963b\u585e\u72b6\u6001\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u9891\u7e41\u7684\u5207\u5165\u5230\u6838\u5fc3\u6001\u3002\u5176\u5b9e\uff0c\u5c31\u662f\u540e\u9762\u81ea\u65cb\u9501\u7684\u601d\u60f3\u3002<\/li>\n<\/ul>\n<p><strong>\u5173\u4e8eReentrantLock\uff1a<\/strong><\/p>\n<ul>\n<li>\u4e0esynchronized\u5173\u952e\u5b57\u76f8\u6bd4\uff0c\u5b83\u662fAPI\u5c42\u9762\u7684\u4e92\u65a5\u9501\uff08lock()\u3001unlock()\u3001try&#8230;finally)\u3002<\/li>\n<li>\u4e0esynchronized\u5173\u952e\u5b57\u76f8\u6bd4\uff0c\u5177\u6709\u53ef\u4e2d\u65ad\u3001\u652f\u6301\u516c\u5e73\u4e0e\u975e\u516c\u5e73\u6027\u3001\u53ef\u7ed1\u5b9a\u591a\u4e2aCondition\u5bf9\u8c61\u7684\u9ad8\u7ea7\u529f\u80fd\u3002<\/li>\n<li>\u7531\u4e8esynchronized\u5173\u952e\u5b57\u88ab\u4f18\u5316\uff0c\u4e8c\u8005\u7684\u6027\u80fd\u5dee\u5f02\u5e76\u4e0d\u662f\u5f88\u5927\uff0c\u5982\u679c\u4e0d\u662f\u60f3\u4f7f\u7528ReentrantLock\u7684\u9ad8\u7ea7\u529f\u80fd\uff0c\u4f18\u5148\u8003\u8651\u4f7f\u7528synchronized\u5173\u952e\u5b57\u3002<\/li>\n<\/ul>\n<h3>\u2461 \u975e\u963b\u585e\u540c\u6b65<\/h3>\n<h5>\uff081\uff09CAS\u6982\u8ff0<\/h5>\n<p>\u4e92\u65a5\u540c\u6b65\u6700\u5927\u7684\u6027\u80fd\u95ee\u9898\u662f\u7ebf\u7a0b\u7684\u963b\u585e\u548c\u5524\u9192\uff0c\u56e0\u6b64\u53c8\u53eb\u963b\u585e\u540c\u6b65\u3002<\/p>\n<p>\u4e92\u65a5\u540c\u6b65\u91c7\u7528\u60b2\u89c2\u5e76\u53d1\u7b56\u7565\uff1a<\/p>\n<ul>\n<li>\u591a\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95ee\u5171\u4eab\u6570\u636e\u65f6\uff0c\u603b\u662f\u8ba4\u4e3a\u53ea\u8981\u4e0d\u52a0\u6b63\u786e\u7684\u540c\u6b65\u63aa\u65bd\uff0c\u80af\u5b9a\u4f1a\u51fa\u73b0\u95ee\u9898\u3002<\/li>\n<li>\u65e0\u8bba\u5171\u4eab\u6570\u636e\u662f\u5426\u5b58\u5728\u7ade\u4e89\uff0c\u90fd\u4f1a\u6267\u884c\u52a0\u9501\u3001\u7528\u6237\u6001\u548c\u5fc3\u6001\u7684\u5207\u6362\u3001\u7ef4\u62a4\u9501\u8ba1\u6570\u5668\u3001\u68c0\u67e5\u662f\u5426\u6709\u88ab\u963b\u585e\u7684\u7ebf\u7a0b\u9700\u8981\u5524\u9192\u7b49\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<p>\u968f\u7740\u786c\u4ef6\u6307\u4ee4\u96c6\u7684\u53d1\u5c55\uff0c\u6211\u4eec\u53ef\u4ee5\u91c7\u7528\u57fa\u4e8e\u51b2\u7a81\u68c0\u6d4b\u7684\u4e50\u89c2\u5e76\u53d1\u7b56\u7565\uff1a<\/p>\n<ul>\n<li>\u5148\u8fdb\u884c\u64cd\u4f5c\uff0c\u5982\u679c\u4e0d\u5b58\u5728\u51b2\u7a81\uff08\u5373\u6ca1\u6709\u5176\u4ed6\u7ebf\u7a0b\u4e89\u7528\u5171\u4eab\u6570\u636e\uff09\uff0c\u5219\u64cd\u4f5c\u6210\u529f\u3002<\/li>\n<li>\u5982\u679c\u6709\u5176\u4ed6\u7ebf\u7a0b\u4e89\u7528\u5171\u4eab\u6570\u636e\uff0c\u4ea7\u751f\u4e86\u51b2\u7a81\uff0c\u4f7f\u7528\u5176\u4ed6\u7684\u8865\u507f\u63aa\u65bd\u3002<\/li>\n<li>\u5e38\u89c1\u7684\u8865\u507f\u63aa\u65bd\uff1a\u4e0d\u65ad\u5c1d\u8bd5\uff0c\u76f4\u5230\u6210\u529f\u4e3a\u6b62\uff0c\u6bd4\u5982\u5faa\u73af\u7684CAS\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<p>\u4e50\u89c2\u5e76\u53d1\u7b56\u7565\u7684\u8bb8\u591a\u5b9e\u73b0\u90fd\u4e0d\u9700\u8981\u5c06\u7ebf\u7a0b\u963b\u585e\uff0c\u8fd9\u79cd\u540c\u6b65\u64cd\u4f5c\u53eb\u505a\u975e\u963b\u585e\u540c\u6b65\u3002<\/p>\n<p>\u975e\u963b\u585e\u540c\u6b65\u4f9d\u9760\u7684\u786c\u4ef6\u6307\u4ee4\u96c6\uff1a\u524d\u4e09\u6761\u662f\u6bd4\u8f83\u4e45\u8fdc\u7684\u6307\u4ee4\uff0c\u540e\u4e24\u6761\u662f\u73b0\u4ee3\u5904\u7406\u5668\u65b0\u589e\u7684\u3002<\/p>\n<ul>\n<li>\u6d4b\u8bd5\u548c\u8bbe\u7f6e\uff08Test and Set)<\/li>\n<li>\u83b7\u53d6\u5e76\u589e\u52a0\uff08Fetch and Increment\uff09<\/li>\n<li>\u4ea4\u6362\uff08Swap\uff09<\/li>\n<li>\u6bd4\u8f83\u5e76\u4ea4\u6362\uff08Compare and Swap\uff0c\u5373CAS\uff09<\/li>\n<li>\u52a0\u8f7d\u94fe\u63a5\/\u6761\u4ef6\u5b58\u50a8\uff08Load Linked\/ Store Conditional\uff0c\u5373LL\/SC\uff09<\/li>\n<\/ul>\n<p><strong>\u4ec0\u4e48\u662fCAS\uff1f<\/strong><\/p>\n<ul>\n<li>CAS\uff0c\u5373Compare and Swap\uff0c\u9700\u8981\u501f\u52a9\u5904\u7406\u5668\u7684cmpxchg\u6307\u4ee4\u5b8c\u6210\u3002<\/li>\n<li>CAS\u6307\u4ee4\u9700\u8981\u4e09\u4e2a\u64cd\u4f5c\u6570\uff1a\u5185\u5b58\u4f4d\u7f6eV\uff08Java\u4e2d\u53ef\u4ee5\u7b80\u5355\u7684\u7406\u89e3\u4e3a\u53d8\u91cf\u7684\u5185\u5b58\u5730\u5740\uff09\u3001\u65e7\u7684\u671f\u5f85\u503cA\u3001\u65b0\u503cB\u3002<\/li>\n<li>CAS\u6307\u4ee4\u6267\u884c\u65f6\uff0c\u5f53\u4e14\u4ec5\u5f53V\u7b26\u5408\u65e7\u7684\u9884\u671f\u503cA\uff0c\u5904\u7406\u5668\u624d\u7528\u65b0\u503cB\u66f4\u65b0V\u7684\u503c\uff1b\u5426\u5219\uff0c\u4e0d\u6267\u884c\u66f4\u65b0\u3002<\/li>\n<li>\u4e0d\u7ba1\u662f\u5426\u66f4\u65b0V\u7684\u503c\uff0c\u90fd\u8fd4\u56deV\u7684\u65e7\u503c\uff0c\u6574\u4e2a\u5904\u7406\u8fc7\u7a0b\u662f\u4e00\u4e2a\u539f\u5b50\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<p>\u539f\u5b50\u64cd\u4f5c\uff1a\u6240\u8c13\u7684\u539f\u5b50\u64cd\u4f5c\u662f\u6307\u4e00\u4e2a\u6216\u4e00\u7cfb\u5217\u4e0d\u53ef\u88ab\u4e2d\u65ad\u7684\u64cd\u4f5c\u3002<\/p>\n<p><strong>Java\u4e2d\u7684CAS\u64cd\u4f5c\uff1a<\/strong><\/p>\n<ul>\n<li>Java\u4e2d\u7684CAS\u64cd\u4f5c\u7531<code>sun.misc.Unsafe<\/code>\u4e2d\u7684compareAndSwapInt()\u3001compareAndSwapLong()\u7b49\u51e0\u4e2a\u65b9\u6cd5\u5305\u88c5\u63d0\u4f9b\u3002\u5b9e\u9645\u65e0\u6cd5\u8c03\u7528\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u9700\u8981\u91c7\u7528\u53cd\u5c04\u673a\u5236\u624d\u80fd\u4f7f\u7528\u3002<\/li>\n<li>\u5728\u5b9e\u9645\u7684\u5f00\u53d1\u8fc7\u7a0b\u4e2d\uff0c\u4e00\u822c\u901a\u8fc7\u5176\u4ed6\u7684Java API\u8c03\u7528\u5b83\u4eec\uff0c\u5982JUC\u5305\u539f\u5b50\u7c7b\u4e2d\u7684<code>compareAndSet(expect, update)<\/code> \u3001getAndIncrement()\u7b49\u65b9\u6cd5\u3002\u8fd9\u4e9b\u65b9\u6cd5\u5185\u90e8\u90fd\u4f7f\u7528\u4e86Unsafe\u7c7b\u7684CAS\u64cd\u4f5c\u3002<\/li>\n<li>Unsafe\u7c7b\u7684CAS\u64cd\u4f5c\uff0c\u901a\u8fc7JVM\u7684\u5373\u65f6\u7f16\u8bd1\u5668\u7f16\u8bd1\u540e\uff0c\u662f\u4e00\u6761\u4e0e\u5e73\u53f0\u76f8\u5173\u7684CAS\u6307\u4ee4\u3002<\/li>\n<\/ul>\n<p>\u9664\u4e86\u504f\u5411\u9501\uff0cJava\u4e2d\u5176\u4ed6\u9501\u7684\u5b9e\u73b0\u65b9\u5f0f\u90fd\u662f\u7528\u4e86\u5faa\u73af\u7684CAS\u64cd\u4f5c\u3002<\/p>\n<h5>\uff082\uff09\u901a\u8fc7\u5faa\u73af\u7684CAS\u5b9e\u73b0\u539f\u5b50\u64cd\u4f5c<\/h5>\n<p>\u901a\u8fc7++i\u6216\u8005i++\u53ef\u4ee5\u5b9e\u73b0\u8ba1\u6570\u5668\u7684\u81ea\u589e\uff0c\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u8fd9\u6837\u4f7f\u7528\u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<\/p>\n<pre><code>public class UnsafeCount {\n    private int i = 0;\n    private static final int THREADS_COUNT = 200;\n\n    public static void main(String[] args) {\n        Thread[] threads = new Thread[THREADS_COUNT];\n        UnsafeCount counter = new UnsafeCount();\n        for (int i = 0; i &lt; THREADS_COUNT; i++) {\n            threads[i] = new Thread(new Runnable() {\n                @Override\n                public void run() {\n                    for (int j = 0; j &lt; 10000; j++) {\n                        counter.count();\n                    }\n                }\n            });\n            threads[i].start();\n        }\n        while (Thread.activeCount() &gt; 1) {\n            Thread.yield();\n        }\n        System.out.println(&quot;\u591a\u7ebf\u7a0b\u8c03\u7528\u8ba1\u6570\u5668i\uff0c\u8fd0\u884c\u540e\u7684\u503c\u4e3a: &quot; + counter.i);\n    }\n\n    public void count() {\n        i++;\n    }\n}<\/code><\/pre>\n<p>\u8fd0\u884c\u4ee5\u4e0a\u7684\u4ee3\u7801\u53d1\u73b0\uff1a\u5f53\u7ebf\u7a0b\u6570\u91cf\u589e\u52a0\uff0c\u6bcf\u4e2a\u7ebf\u7a0b\u8c03\u7528\u8ba1\u6570\u5668\u7684\u6b21\u6570\u53d8\u5927\u65f6\uff0c\u6bcf\u6b21\u8fd0\u884c\u7684\u7ed3\u679c\u662f\u9519\u8bef\u4e14\u4e0d\u56fa\u5b9a\u7684\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc3Zls\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc3Zlt\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u4e3a\u4e86\u5b9e\u73b0\u5b9e\u5728\u4e00\u4e2a\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u3001\u7ebf\u7a0b\u5b89\u5168\u7684\u8ba1\u6570\u5668\uff0c\u9700\u8981\u4f7f\u7528AtomicInteger\u7684\u539f\u5b50\u81ea\u589e\u8fd0\u7b97\u3002<\/p>\n<pre><code>import java.util.concurrent.atomic.AtomicInteger;\npublic class SafeCount {\n    private AtomicInteger atomic = new AtomicInteger(0);\n    private static final int THREAD_COUNT = 200;\n    public static void main(String[] args) {\n        SafeCount counter = new SafeCount();\n        Thread[] threads = new Thread[THREAD_COUNT];\n        for (int i = 0; i &lt; THREAD_COUNT; i++) {\n            threads[i] = new Thread(new Runnable() {\n                @Override\n                public void run() {\n                    for (int j=0;j&lt;10000;j++){\n                        counter.count();\n                    }\n                }\n            });\n            threads[i].start();\n        }\n        while (Thread.activeCount()&gt;1){\n            Thread.yield();\n        }\n        System.out.println(&quot;\u591a\u7ebf\u7a0b\u8c03\u7528\u7ebf\u7a0b\u5b89\u5168\u7684\u8ba1\u6570\u5668atomic\uff1a&quot;+counter.atomic);\n    }\n    public void count() {\n        \/\/ \u8c03\u7528compareAnSet\u65b9\u6cd5\uff0c\u4f7f\u7528\u5faa\u73af\u7684CAS\u64cd\u4f5c\u5b9e\u73b0\u8ba1\u6570\u5668\u7684\u539f\u5b50\u81ea\u589e\n        for (; ; ) {\n            int expect = atomic.get();\n            int curVal = expect + 1;\n            if (atomic.compareAndSet(expect, curVal)) {\n                break;\n            }\n        }\n    }\n}<\/code><\/pre>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc3Zlu\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u4e0e\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\u8ba1\u6570\u5668\u76f8\u6bd4\uff0c\u7ebf\u7a0b\u5b89\u5168\u7684\u8ba1\u6570\u5668\u6709\u4ee5\u4e0b\u7279\u70b9\uff1a<\/p>\n<ul>\n<li>\u5c06int\u7c7b\u578b\u7684\u8ba1\u6570\u5668\u53d8\u91cfi\uff0c\u66f4\u6362\u6210\u5177\u6709CAS\u64cd\u4f5c\u7684AtomicInteger\u7c7b\u578b\u7684\u8ba1\u6570\u5668\u53d8\u91cfatomic\u3002<\/li>\n<li>\u8fdb\u884c\u81ea\u589e\u8fd0\u7b97\u65f6\uff0c\u901a\u8fc7\u5faa\u73af\u7684CAS\u64cd\u4f5c\u5b9e\u73b0atomic\u7684\u539f\u5b50\u81ea\u589e\u3002<\/li>\n<li>\u5148\u901a\u8fc7atomic.get()\u83b7\u53d6expect\u7684\u503c\uff0c\u5c06expect\u52a0\u4e00\u5f97\u5230\u65b0\u503c\uff0c\u7136\u540e\u901a\u8fc7<code>atomic.compareAndSet(expect, curVal)<\/code>\u8fd9\u4e00\u65b9\u6cd5\u5b9e\u73b0CAS\u64cd\u4f5c\u3002<\/li>\n<li>\u5176\u4e2dcompareAndSet()\u8fd4\u56de\u7684true\u6216\u8005false\uff0c\u8868\u793a\u6b64\u6b21CAS\u64cd\u4f5c\u662f\u5426\u6210\u529f\u3002\u5982\u679c\u8fd4\u56defalse\uff0c\u5219\u4e0d\u505c\u5730\u91cd\u590d\u6267\u884cCAS\u64cd\u4f5c\uff0c\u76f4\u5230\u64cd\u4f5c\u6210\u529f\u3002<\/li>\n<\/ul>\n<p>\u4e0a\u9762\u7684count\u65b9\u6cd5\u5b9e\u73b0\u7684AtomicInteger\u539f\u5b50\u81ea\u589e\uff0c\u53ef\u4ee5\u53ea\u9700\u8981\u8c03\u7528incrementAndGet()\u4e00\u4e2a\u65b9\u6cd5\u5c31\u80fd\u5b9e\u73b0\u3002<\/p>\n<pre><code>public void count() {\n    \/\/ \u8c03\u7528incrementAndGet\u65b9\u6cd5\uff0c\u5b9e\u73b0AtomicInteger\u7684\u539f\u5b50\u81ea\u589e\n    atomic.incrementAndGet();\n}<\/code><\/pre>\n<p>\u56e0\u4e3aincrementAndGet()\u65b9\u6cd5\uff0c\u5c01\u88c5\u4e86\u901a\u8fc7\u5faa\u73af\u7684CAS\u64cd\u4f5c\u5b9e\u73b0AtomicInteger\u539f\u5b50\u81ea\u589e\u7684\u4ee3\u7801\u3002<\/p>\n<pre><code>public final int incrementAndGet() {\n    return unsafe.getAndAddInt(this, valueOffset, 1) + 1;\n}\npublic final int getAndAddInt(Object var1, long var2, int var4) {\n    int var5;\n    do {\n        var5 = this.getIntVolatile(var1, var2);\n    } while(!this.compareAndSwapInt(var1, var2, var5, var5 + var4));\n    return var5;\n}<\/code><\/pre>\n<h5>\uff083\uff09CAS\u64cd\u4f5c\u5b58\u5728\u7684\u95ee\u9898<\/h5>\n<p><strong>1. ABA\u95ee\u9898<\/strong><\/p>\n<ul>\n<li>\u5728\u6267\u884cCAS\u64cd\u4f5c\u66f4\u65b0\u5171\u4eab\u53d8\u91cf\u7684\u503c\u65f6\uff0c\u5982\u679c\u4e00\u4e2a\u503c\u539f\u6765\u662fA\uff0c\u88ab\u5176\u4ed6\u7ebf\u7a0b\u6539\u6210\u4e86B\uff0c\u7136\u540e\u53c8\u6539\u56de\u6210\u4e86A\u3002\u5bf9\u4e8e\u8be5CAS\u64cd\u4f5c\u6765\u8bf4\uff0c\u5b83\u5b8c\u5168\u611f\u53d7\u4e0d\u5230\u5171\u4eab\u53d8\u91cf\u503c\u7684\u53d8\u5316\u3002\u8fd9\u79cd\u64cd\u4f5c\u6f0f\u6d1e\u79f0\u4e3aCAS\u64cd\u4f5c\u7684ABA\u95ee\u9898\u3002<\/li>\n<li>\u89e3\u51b3\u8be5\u95ee\u9898\u7684\u601d\u8def\u662f\uff0c\u4e3a\u53d8\u91cf\u6dfb\u52a0\u7248\u672c\u53f7\uff0c\u6bcf\u6b21\u66f4\u65b0\u65f6\u7248\u672c\u53f7\u9012\u589e\u3002\u8fd9\u79cd\u573a\u666f\u4e0b\u5c31\u6210\u4e861A &#8211;&gt; 2B &#8211;&gt; 3A\u3002CAS\u64cd\u4f5c\u5c31\u80fd\u68c0\u6d4b\u5230\u5171\u4eab\u53d8\u91cf\u7684ABA\u95ee\u9898\u4e86\u3002<\/li>\n<li>JUC\u5305\u4e2d\uff0c\u4e5f\u63d0\u4f9b\u4e86\u76f8\u5e94\u7684\u5e26\u6807\u8bb0\u7684\u539f\u5b50\u5f15\u7528\u7c7bAtomicStampedReference\u6765\u89e3\u51b3ABA\u95ee\u9898\u3002<\/li>\n<li>AtomicStampedReference\u7684compareAndSet()\u65b9\u6cd5\u4f1a\u9996\u5148\u6bd4\u8f83\u671f\u5f85\u7684\u5f15\u7528\u662f\u5426\u7b49\u4e8e\u5f53\u524d\u5f15\u7528\uff0c\u7136\u540e\u68c0\u67e5\u671f\u5f85\u7684\u6807\u8bb0\u662f\u5426\u7b49\u4e8e\u5f53\u524d\u6807\u8bb0\u3002\u5982\u679c\u5168\u90e8\u76f8\u7b49\uff0c\u5219\u4ee5\u539f\u5b50\u64cd\u4f5c\u7684\u65b9\u5f0f\u5c06\u65b0\u7684\u5f15\u7528\u548c\u65b0\u7684\u6807\u8bb0\u66f4\u65b0\u5230\u5f53\u524d\u503c\u4e2d\u3002<\/li>\n<li>\u4f46\u662fAtomicStampedReference\u76ee\u524d\u6bd4\u8f83\u9e21\u808b\uff0c\u5982\u679c\u60f3\u89e3\u51b3AB\u95ee\u9898\uff0c\u53ef\u4ee5\u4f7f\u7528\u9501\u3002<\/li>\n<\/ul>\n<p><strong>2. \u5faa\u73af\u65f6\u95f4\u8fc7\u957f\uff0c\u5f00\u9500\u5927<\/strong><\/p>\n<p>\u5faa\u73af\u7684CAS\u64cd\u4f5c\u5982\u679c\u957f\u65f6\u95f4\u4e0d\u6210\u529f\uff0c\u4f1a\u7ed9CPU\u5e26\u6765\u975e\u5e38\u5927\u7684\u6267\u884c\u5f00\u9500\u3002<\/p>\n<p><strong>3. \u53ea\u80fd\u4fdd\u8bc1\u4e00\u4e2a\u5171\u4eab\u53d8\u91cf\u7684\u539f\u5b50\u64cd\u4f5c<\/strong><\/p>\n<ul>\n<li>\u53ea\u5bf9\u4e00\u4e2a\u5171\u4eab\u53d8\u91cf\u6267\u884c\u64cd\u4f5c\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u5faa\u73af\u7684CAS\u64cd\u4f5c\u5b9e\u73b0\u3002\u5982\u679c\u662f\u591a\u4e2a\u5171\u4eab\u53d8\u91cf\uff0c\u5faa\u73af\u7684CAS\u64cd\u4f5c\u65e0\u6cd5\u4fdd\u8bc1\u64cd\u4f5c\u7684\u539f\u5b50\u6027\u3002<\/li>\n<li>\u53d6\u5de7\u7684\u64cd\u4f5c\uff1a\u5c06\u591a\u4e2a\u5171\u4eab\u53d8\u91cf\u5408\u4e3a\u4e00\u4e2a\u53d8\u91cf\u8fdb\u884cCAS\u64cd\u4f5c\u3002JDK1.5\u5f00\u59cb\uff0c\u63d0\u4f9b\u4e86AtomicReference\u7c7b\u4fdd\u8bc1\u5f15\u7528\u5bf9\u8c61\u4e4b\u95f4\u7684\u539f\u5b50\u6027\uff0c\u53ef\u4ee5\u5c06\u591a\u4e2a\u53d8\u91cf\u653e\u5728\u4e00\u4e2a\u5bf9\u8c61\u4e2d\u8fdb\u884cCAS\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<h3>\u2462 \u65e0\u540c\u6b65\u65b9\u6848<\/h3>\n<p>\u540c\u6b65\u53ea\u662f\u4fdd\u8bc1\u5171\u4eab\u6570\u636e\u4e89\u7528\u65f6\u6b63\u786e\u6027\u7684\u4e00\u79cd\u624b\u6bb5\uff0c\u5982\u679c\u4e0d\u5b58\u5728\u5171\u4eab\u6570\u636e\uff0c\u81ea\u7136\u65e0\u987b\u4efb\u4f55\u540c\u6b65\u63aa\u65bd\u3002<\/p>\n<h5>\uff081\uff09\u6808\u5c01\u95ed<\/h5>\n<p>\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u540c\u4e00\u4e2a\u65b9\u6cd5\u7684\u5c40\u90e8\u53d8\u91cf\u65f6\uff0c\u4e0d\u4f1a\u51fa\u73b0\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u3002<\/p>\n<p>\u56e0\u4e3a\u65b9\u6cd5\u4e2d\u7684\u5c40\u90e8\u53d8\u91cf\u4e0d\u4f1a\u9003\u51fa\u8be5\u65b9\u6cd5\u800c\u88ab\u5176\u4ed6\u7ebf\u7a0b\u8bbf\u95ee\uff0c\u56e0\u6b64\u53ef\u4ee5\u770b\u505aJVM\u6808\u4e2d\u6570\u636e\uff0c\u5c5e\u4e8e\u7ebf\u7a0b\u79c1\u6709\u3002<\/p>\n<h5>\uff082\uff09\u53ef\u91cd\u5165\u4ee3\u7801\uff08Reentrant Code\uff09<\/h5>\n<p>\u53ef\u91cd\u5165\u4ee3\u7801\u53c8\u53eb\u7eaf\u4ee3\u7801\uff08Pure Code\uff09\uff0c\u53ef\u5728\u4ee3\u7801\u6267\u884c\u7684\u4efb\u4f55\u65f6\u5019\u4e2d\u65ad\u4ed6\u5b83\uff0c\u8f6c\u53bb\u6267\u884c\u53e6\u5916\u4e00\u6bb5\u4ee3\u7801\uff08\u5305\u62ec\u9012\u5f52\u8c03\u7528\u5b83\u672c\u8eab\uff09\uff0c\u63a7\u5236\u6743\u8fd4\u56de\u540e\uff0c\u539f\u6765\u7684\u7a0b\u5e8f\u4e0d\u4f1a\u51fa\u73b0\u4efb\u4f55\u9519\u8bef\u3002<\/p>\n<p>\u6240\u6709\u53ef\u91cd\u5165\u7684\u4ee3\u7801\u90fd\u662f\u7ebf\u7a0b\u5b89\u5168\uff0c\u5e76\u975e\u6240\u6709\u7ebf\u7a0b\u5b89\u5168\u7684\u4ee3\u7801\u90fd\u662f\u53ef\u91cd\u5165\u7684\u3002<\/p>\n<p>\u53ef\u91cd\u5165\u4ee3\u7801\u7684\u5171\u540c\u7279\u5f81\uff1a<\/p>\n<ul>\n<li>\u4e0d\u4f9d\u8d56\u5b58\u50a8\u5728\u5806\u4e0a\u7684\u6570\u636e\u548c\u516c\u7528\u7684\u7cfb\u7edf\u8d44\u6e90<\/li>\n<li>\u7528\u5230\u7684\u72b6\u6001\u91cf\u90fd\u7531\u53c2\u6570\u4e2d\u4f20\u5165<\/li>\n<li>\u4e0d\u8c03\u7528\u975e\u53ef\u91cd\u7528\u7684\u65b9\u6cd5<\/li>\n<\/ul>\n<p>\u5982\u4f55\u5224\u65ad\u4ee3\u7801\u662f\u5426\u5177\u5907\u53ef\u91cd\u5165\u6027\uff1f\u5982\u679c\u4e00\u4e2a\u65b9\u6cd5\uff0c\u5b83\u7684\u8fd4\u56de\u7ed3\u679c\u662f\u53ef\u9884\u6d4b\u7684\u3002\u53ea\u8981\u8f93\u5165\u4e86\u76f8\u540c\u7684\u6570\u636e\uff0c\u5c31\u90fd\u80fd\u8fd4\u56de\u76f8\u540c\u7684\u7ed3\u679c\uff0c\u90a3\u5b83\u5c31\u6ee1\u8db3\u53ef\u91cd\u5165\u6027\uff0c\u5f53\u7136\u4e5f\u5c31\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<\/p>\n<h5>\uff083\uff09\u7ebf\u7a0b\u672c\u5730\u5b58\u50a8\uff08TLS\uff09<\/h5>\n<p>\u7ebf\u7a0b\u672c\u5730\u5b58\u50a8\uff08Thread Local Storage\uff09\uff1a<\/p>\n<ul>\n<li>\u5982\u679c\u4e00\u6bb5\u4ee3\u7801\u4e2d\u6240\u9700\u8981\u7684\u6570\u636e\u5fc5\u987b\u4e0e\u5176\u4ed6\u4ee3\u7801\u5171\u4eab\uff0c\u90a3\u5c31\u770b\u770b\u8fd9\u4e9b\u5171\u4eab\u6570\u636e\u7684\u4ee3\u7801\u662f\u5426\u80fd\u4fdd\u8bc1\u5728\u540c\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u6267\u884c\u3002<\/li>\n<li>\u5982\u679c\u80fd\u4fdd\u8bc1\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u628a\u5171\u4eab\u6570\u636e\u7684\u53ef\u89c1\u8303\u56f4\u9650\u5236\u5728\u540c\u4e00\u4e2a\u7ebf\u7a0b\u5185\u3002<\/li>\n<li>\u8fd9\u6837\uff0c\u65e0\u987b\u540c\u6b65\u4e5f\u80fd\u4fdd\u8bc1\u7ebf\u7a0b\u4e4b\u95f4\u4e0d\u51fa\u73b0\u6570\u636e\u4e89\u7528\u7684\u95ee\u9898\u3002<\/li>\n<\/ul>\n<p>TLS\u7684\u91cd\u8981\u5e94\u7528\u5b9e\u4f8b\uff1a\u7ecf\u5178\u7684Web\u4ea4\u4e92\u6a21\u578b\u4e2d\uff0c\u4e00\u4e2a\u8bf7\u6c42\u5bf9\u5e94\u4e00\u4e2a\u670d\u52a1\u5668\u7ebf\u7a0b\uff0c\u4f7f\u5f97Web\u670d\u52a1\u5668\u5e94\u7528\u53ef\u4ee5\u4f7f\u7528\u3002<\/p>\n<p>Java\u4e2d\u6ca1\u6709\u5173\u952e\u5b57\u53ef\u4ee5\u5c06\u4e00\u4e2a\u53d8\u91cf\u5b9a\u4e49\u4e3a\u7ebf\u7a0b\u6240\u72ec\u4eab\uff0c\u4f46\u662fJava\u4e2d\u521b\u5efa\u4e86<code>java.lang.ThreadLocal<\/code>\u7c7b\u63d0\u4f9b\u7ebf\u7a0b\u672c\u5730\u5b58\u50a8\u529f\u80fd\u3002<\/p>\n<ul>\n<li>\u6bcf\u4e00\u4e2a\u7ebf\u7a0b\u5185\u90e8\u90fd\u5305\u542b\u4e00\u4e2aThreadLocalMap\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u5c06ThreadLocal\u5bf9\u8c61\u7684hashCode\u503c\u4f5c\u4e3akey\uff0c\u5373ThreadLocal.threadLocalHashCode\uff0c\u5c06\u672c\u5730\u7ebf\u7a0b\u53d8\u91cf\u4f5c\u4e3avalue\uff0c\u6784\u6210\u952e\u503c\u5bf9\u3002<\/li>\n<li>ThreadLocal\u5bf9\u8c61\u662f\u5f53\u524d\u7ebf\u7a0bThreadLocalMap\u5bf9\u8c61\u7684\u8bbf\u95ee\u5165\u53e3\uff0c\u901a\u8fc7<code>threadLocal.set()<\/code>\u4e3a\u672c\u5730\u7ebf\u7a0b\u6dfb\u52a0\u72ec\u4eab\u53d8\u91cf\uff1b\u901a\u8fc7<code>threadLocal.get()<\/code>\u83b7\u53d6\u672c\u5730\u7ebf\u7a0b\u72ec\u4eab\u53d8\u91cf\u7684\u503c\u3002<\/li>\n<li>ThreadLocal\u3001ThreadLocalMap\u3001Thread\u7684\u5173\u7cfb\uff1aThread\u5bf9\u8c61\u4e2d\u5305\u542bThreadLocalMap\u5bf9\u8c61\uff0cThreadLocalMap\u5bf9\u8c61\u4e2d\u5305\u542b\u591a\u4e2a\u952e\u503c\u5bf9\uff0c\u6bcf\u4e2a\u952e\u503c\u5bf9\u7684key\u662fThreadLocal\u5bf9\u8c61\u7684hashCode\uff0cvalue\u662f\u672c\u5730\u7ebf\u7a0b\u53d8\u91cf\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc3Zlv\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>ThreadLocal\u7684\u7f16\u7a0b\u5b9e\u4f8b\uff1a<\/p>\n<ul>\n<li>\u60f3\u4e3a\u67d0\u4e2a\u7ebf\u7a0b\u6dfb\u52a0\u672c\u5730\u7ebf\u7a0b\u53d8\u91cf\uff0c\u5fc5\u987b\u901a\u8fc7ThreadLocal\u5bf9\u8c61\u5728\u8be5\u7ebf\u7a0b\u4e2d\u8fdb\u884c\u6dfb\u52a0\uff0c\u6784\u9020\u51fa\u7684\u952e\u503c\u5bf9\u81ea\u52a8\u5b58\u5165\u8be5\u7ebf\u7a0b\u7684map\u4e2d\uff1b<\/li>\n<li>\u60f3\u8981\u83b7\u53d6\u67d0\u4e2a\u7ebf\u7a0b\u7684\u672c\u5730\u7ebf\u7a0b\u53d8\u91cf\uff0c\u5fc5\u987b\u5728\u8be5\u7ebf\u7a0b\u4e2d\u83b7\u53d6\uff0c\u4f1a\u81ea\u52a8\u67e5\u8be2\u8be5\u7ebf\u7a0b\u7684map\uff0c\u83b7\u5f97ThreadLocal\u5bf9\u8c61\u5bf9\u5e94\u7684value\u3002<\/li>\n<li>\u901a\u8fc7ThreadLocal\u5bf9\u8c61\u91cd\u590d\u4e3a\u67d0\u4e2a\u7ebf\u7a0b\u6dfb\u52a0\u952e\u503c\u5bf9\uff0c\u4f1a\u8986\u76d6\u4e4b\u524d\u7684value\u3002<\/li>\n<\/ul>\n<pre><code>public class TLS {\n    public static void main(String[] args) {\n        ThreadLocal&lt;String&gt; threadLocal1 = new ThreadLocal&lt;&gt;();\n        ThreadLocal&lt;Integer&gt; threadLocal2 = new ThreadLocal&lt;&gt;();\n        Thread thread1 = new Thread(new Runnable() {\n            @Override\n            public void run() {\n                \/\/ \u8bbe\u7f6e\u5f53\u524d\u7ebf\u7a0b\u7684\u672c\u5730\u7ebf\u7a0b\u53d8\u91cf\n                threadLocal1.set(&quot;thread1&quot;);\n                threadLocal2.set(1);\n                System.out.println(threadLocal1.get() + &quot;: &quot; + threadLocal2.get());\n                \/\/ \u4f7f\u7528\u5b8c\u6bd5\u540e\u8981\u5220\u9664\uff0c\u907f\u514d\u5185\u5b58\u6cc4\u9732\n                threadLocal1.remove();\n                threadLocal2.remove();\n            }\n        });\n        Thread thread2 = new Thread(new Runnable() {\n            @Override\n            public void run() {\n                threadLocal1.set(&quot;thread2&quot;);\n                threadLocal2.set(2);\n                System.out.println(threadLocal1.get() + &quot;: &quot; + threadLocal2.get());\n                threadLocal1.remove();\n                threadLocal2.remove();\n            }\n        });\n        thread1.start();\n        thread2.start();\n        \/\/ \u6ca1\u6709\u901a\u8fc7ThreadLocal\u4e3a\u4e3b\u7ebf\u7a0b\u6dfb\u52a0\u8fc7\u672c\u5730\u7ebf\u7a0b\u53d8\u91cf\uff0c\u83b7\u53d6\u5230\u7684\u5185\u5bb9\u90fd\u662fnull\n        System.out.println(threadLocal1.get()+&quot;: &quot;+threadLocal2.get());\n    }\n}<\/code><\/pre>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc3Zlw\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u5bf9ThreadLocal\u7684\u6b63\u786e\u7406\u89e3\uff1a<\/p>\n<ul>\n<li>ThreadLocal\u9002\u7528\u4e8e\u7ebf\u7a0b\u9700\u8981\u6709\u81ea\u5df1\u7684\u5b9e\u4f8b\u53d8\u91cf\uff0c\u8be5\u5b9e\u4f8b\u53d8\u91cf\u53ef\u4ee5\u5728\u591a\u4e2a\u65b9\u6cd5\u4e2d\u88ab\u4f7f\u7528\uff0c\u4f46\u662f\u4e0d\u80fd\u88ab\u5176\u4ed6\u7ebf\u7a0b\u5171\u4eab\u7684\u573a\u666f\u3002<\/li>\n<li>\u7531\u4e8e\u4e0d\u5b58\u5728\u6570\u636e\u5171\u4eab\uff0c\u4f55\u8c08\u540c\u6b65\uff1f\u56e0\u6b64ThreadLocal \u4ece\u7406\u8bba\u4e0a\u8bb2\uff0c\u4e0d\u662f\u7528\u6765\u89e3\u51b3\u591a\u7ebf\u7a0b\u5e76\u53d1\u95ee\u9898\u7684\u3002<\/li>\n<\/ul>\n<p><strong>ThreadLocal\u7684\u5b9e\u73b0\uff1a<\/strong><\/p>\n<p>\u6700\u539f\u59cb\u7684\u60f3\u6cd5\uff1aThreadLocal\u7ef4\u62a4\u7ebf\u7a0b\u4e0e\u5b9e\u4f8b\u7684\u6620\u5c04\u3002\u65e2\u7136\u901a\u8fc7ThreadLocal\u5bf9\u8c61\u4e3a\u7ebf\u7a0b\u6dfb\u52a0\u672c\u5730\u7ebf\u7a0b\u53d8\u91cf\uff0c\u90a3\u5c31\u5c06ThreadLocalMap\u653e\u5728ThreadLocal\u4e2d\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc3Zlx\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u539f\u59cb\u60f3\u6cd5\u5b58\u5728\u7684\u7f3a\u9677\uff1a\u591a\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95eeThreadLocal\u4e2d\u7684Map\uff0c\u9700\u8981\u6dfb\u52a0\u9501\u3002\u8fd9\u662f\uff0c JDK \u672a\u91c7\u7528\u8be5\u65b9\u6848\u7684\u4e00\u4e2a\u539f\u56e0\u3002<\/p>\n<p>\u4f18\u5316\u540e\u7684\u65b9\u6cd5\uff1aThread\u7ef4\u62a4ThreadLocal\u4e0e\u5b9e\u4f8b\u7684\u6620\u5c04\u3002Map\u662f\u6bcf\u4e2a\u7ebf\u7a0b\u6240\u79c1\u6709\uff0c\u53ea\u80fd\u5728\u5f53\u524d\u7ebf\u7a0b\u901a\u8fc7ThreadLocal\u5bf9\u8c61\u8bbf\u95ee\u81ea\u8eab\u7684Map\u3002\u4e0d\u5b58\u5728\u591a\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95ee\u540c\u4e00\u4e2aMap\u7684\u60c5\u51b5\uff0c\u4e5f\u5c31\u4e0d\u9700\u8981\u9501\u3002<\/p>\n<p>\u4f18\u5316\u540e\u5b58\u5728\u5185\u5b58\u6cc4\u9732\u7684\u60c5\u51b5\uff1aJDK1.8\u4e2d\uff0cThreadLocalMap\u6bcf\u4e2aEntry\u5bf9ThreadLocal\u5bf9\u8c61\u662f\u5f31\u5f15\u7528\uff0c\u5bf9\u6bcf\u4e2a\u5b9e\u4f8b\u662f\u5f3a\u5f15\u7528\u3002\u5f53ThreadLocal\u5bf9\u8c61\u88ab\u56de\u6536\u540e\uff0c\u8be5Entry\u7684\u952e\u53d8\u6210null\uff0c\u4f46Entry\u65e0\u6cd5\u88ab\u79fb\u9664\u3002\u4f7f\u5f97\u5b9e\u4f8b\u88abEntry\u5f15\u7528\u65e0\u6cd5\u56de\u6536\uff0c\u9020\u6210\u5185\u5b58\u6cc4\u9732\u3002<\/p>\n<p><strong>\u8fd1\u671f\u70ed\u6587\u63a8\u8350\uff1a<\/strong><\/p>\n<p>1.<a href=\"https:\/\/link.segmentfault.com\/?enc=bTR2lryj7Ym42u%2FSM6R5Vw%3D%3D.0n5QnkiNCrhj2ZE1JTTuKAE%2BReL6Ta4YuTc%2BBgMueEM%3D\" rel=\"nofollow\">1,000+ \u9053 Java\u9762\u8bd5\u9898\u53ca\u7b54\u6848\u6574\u7406(2022\u6700\u65b0\u7248)<\/a><\/p>\n<p>2.<a href=\"https:\/\/link.segmentfault.com\/?enc=%2BE50XGFcraNQbbyor%2FiXOw%3D%3D.XUmCcBqZkrxKgqxrpp4pnEj4e330Q0jLyaCcURQAvikaknDr9fYQRR%2BD%2FDxsTM8bY%2BHX437SWPB6ETQkCmbBFQ%3D%3D\" rel=\"nofollow\">\u52b2\u7206\uff01Java \u534f\u7a0b\u8981\u6765\u4e86\u3002\u3002\u3002<\/a><\/p>\n<p>3.<a href=\"https:\/\/link.segmentfault.com\/?enc=Zo2pji0kF4S99WTDrXhwiw%3D%3D.HnA1zktVm7lU%2FxvjqvCO3hl%2BsJvbzc4XU0dbiFG7GUVX%2FNdRruc19KIcGN0dP%2Ff2\" rel=\"nofollow\">Spring Boot 2.x \u6559\u7a0b\uff0c\u592a\u5168\u4e86\uff01<\/a><\/p>\n<p>4.<a href=\"https:\/\/link.segmentfault.com\/?enc=Fnl2UuEp%2BncGArZJ45pnew%3D%3D.CgVqYtoL5TsSSyZ6yKd%2B%2BSu36a8VUVpAQLhlVBzikhTEAz1wAr%2F2UwUM7RegdMthaDdwMExB81JzFy3EIcIUvg%3D%3D\" rel=\"nofollow\">\u522b\u518d\u5199\u6ee1\u5c4f\u7684\u7206\u7206\u7206\u70b8\u7c7b\u4e86\uff0c\u8bd5\u8bd5\u88c5\u9970\u5668\u6a21\u5f0f\uff0c\u8fd9\u624d\u662f\u4f18\u96c5\u7684\u65b9\u5f0f\uff01\uff01<\/a><\/p>\n<p>5.<a href=\"https:\/\/link.segmentfault.com\/?enc=Y8VRmmeUNvwM5mb9ODjndA%3D%3D.14WmlDLP%2F0EH7jVhPuekotEwQuGvSCb%2BEswZKuUGpuRB8bx5%2FbSq5kd7RthQTKsZeYUBrl1%2F6yBJnhXOLpzmnKx5w4ZZnD4FD2spTdyoGLQ%3D\" rel=\"nofollow\">\u300aJava\u5f00\u53d1\u624b\u518c\uff08\u5d69\u5c71\u7248\uff09\u300b\u6700\u65b0\u53d1\u5e03\uff0c\u901f\u901f\u4e0b\u8f7d\uff01<\/a><\/p>\n<p>\u89c9\u5f97\u4e0d\u9519\uff0c\u522b\u5fd8\u4e86\u968f\u624b\u70b9\u8d5e+\u8f6c\u53d1\u54e6\uff01<\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000042857462\">https:\/\/segmentfault.com\/a\/1190000042857462<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6765\u6e90\uff1ablog.csdn.net\/u014454538\/article\/details\/98515807 1. 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