{"id":3874,"date":"2025-07-12T13:40:47","date_gmt":"2025-07-12T05:40:47","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3874"},"modified":"2025-07-12T13:40:47","modified_gmt":"2025-07-12T05:40:47","slug":"%e6%80%8e%e6%a0%b7%e7%90%86%e8%a7%a3%e7%ba%bf%e7%a8%8b%e5%ae%89%e5%85%a8%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/07\/12\/%e6%80%8e%e6%a0%b7%e7%90%86%e8%a7%a3%e7%ba%bf%e7%a8%8b%e5%ae%89%e5%85%a8%e9%97%ae%e9%a2%98\/","title":{"rendered":"\u600e\u6837\u7406\u89e3\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898"},"content":{"rendered":"\n<p>\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u662f\u5e76\u53d1\u7f16\u7a0b\u4e2d\u6700\u6838\u5fc3\u3001\u6700\u5e38\u89c1\u7684\u6311\u6218\u4e4b\u4e00\u3002\u4e0b\u9762\u6211\u5c06\u4ece<strong>\u5b9a\u4e49\u3001\u53d1\u751f\u539f\u56e0\u3001\u5e38\u89c1\u95ee\u9898\u3001\u793a\u4f8b\u8bf4\u660e\u3001\u89e3\u51b3\u65b9\u6cd5\u3001\u8bbe\u8ba1\u539f\u5219\u3001\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/strong>\u4e03\u4e2a\u65b9\u9762\uff0c\u5168\u9762\u7cfb\u7edf\u5730\u5e2e\u4f60\u7406\u89e3\u4ec0\u4e48\u662f\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\uff0c\u4ee5\u53ca\u5982\u4f55\u5e94\u5bf9\u5b83\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u4ec0\u4e48\u662f\u7ebf\u7a0b\u5b89\u5168\uff08Thread Safety\uff09\uff1f<\/h2>\n\n\n\n<p><strong>\u7ebf\u7a0b\u5b89\u5168<\/strong>\u662f\u6307\uff1a<strong>\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u65f6\uff0c\u7a0b\u5e8f\u603b\u80fd\u8868\u73b0\u51fa\u6b63\u786e\u7684\u884c\u4e3a\uff08\u65e0\u8bba\u64cd\u4f5c\u7cfb\u7edf\u5982\u4f55\u8c03\u5ea6\u8fd9\u4e9b\u7ebf\u7a0b\uff09<\/strong>\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u4e00\u4e2a\u65b9\u6cd5\u6216\u7c7b\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u90a3\u4e48\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5728\u591a\u7ebf\u7a0b\u5e76\u53d1\u73af\u5883\u4e0b\u8fd0\u884c\u4e5f\u80fd\u4fdd\u6301\u6b63\u786e\u6027<\/li>\n\n\n\n<li>\u4e0d\u4f1a\u53d1\u751f\u6570\u636e\u7ade\u6001\uff08Race Condition\uff09\u6216\u72b6\u6001\u4e0d\u4e00\u81f4<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u7684\u6839\u672c\u539f\u56e0<\/h2>\n\n\n\n<p>\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u4e3b\u8981\u6e90\u4e8e\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u539f\u56e0<\/th><th>\u8bf4\u660e<\/th><\/tr><\/thead><tbody><tr><td><strong>\u5171\u4eab\u8d44\u6e90<\/strong><\/td><td>\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee<strong>\u540c\u4e00\u5757\u5185\u5b58\u6570\u636e<\/strong>\uff08\u5982\u53d8\u91cf\u3001\u96c6\u5408\u3001\u5bf9\u8c61\u5b57\u6bb5\uff09<\/td><\/tr><tr><td><strong>\u975e\u539f\u5b50\u64cd\u4f5c<\/strong><\/td><td>\u64cd\u4f5c\u4e0d\u662f\u4e00\u53e3\u6c14\u5b8c\u6210\uff0c\u53ef\u80fd\u5728\u4e2d\u9014\u88ab\u522b\u7684\u7ebf\u7a0b\u62a2\u5360 CPU<\/td><\/tr><tr><td><strong>\u7f3a\u4e4f\u540c\u6b65\u673a\u5236<\/strong><\/td><td>\u6ca1\u6709\u52a0\u9501\u3001\u52a0\u9501\u4e0d\u5f53\u6216\u4f7f\u7528\u4e86\u4e0d\u5408\u9002\u7684\u540c\u6b65\u673a\u5236<\/td><\/tr><tr><td><strong>\u7f13\u5b58\u53ef\u89c1\u6027\u95ee\u9898<\/strong><\/td><td>\u4e00\u4e2a\u7ebf\u7a0b\u66f4\u65b0\u4e86\u503c\uff0c\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u770b\u4e0d\u5230\uff08JMM \u5185\u5b58\u6a21\u578b\u95ee\u9898\uff09<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u5e38\u89c1\u7684\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u7c7b\u578b<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u95ee\u9898\u7c7b\u578b<\/th><th>\u63cf\u8ff0<\/th><\/tr><\/thead><tbody><tr><td><strong>\u7ade\u6001\u6761\u4ef6\uff08Race Condition\uff09<\/strong><\/td><td>\u591a\u4e2a\u7ebf\u7a0b\u4e89\u62a2\u4e00\u4e2a\u53d8\u91cf\u5bfc\u81f4\u6570\u636e\u9519\u4e71<\/td><\/tr><tr><td><strong>\u810f\u8bfb\uff08Dirty Read\uff09<\/strong><\/td><td>\u4e00\u4e2a\u7ebf\u7a0b\u8bfb\u53d6\u4e86\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u8fd8\u672a\u63d0\u4ea4\u7684\u66f4\u65b0\u6570\u636e<\/td><\/tr><tr><td><strong>\u53ef\u89c1\u6027\u95ee\u9898<\/strong><\/td><td>\u4e00\u4e2a\u7ebf\u7a0b\u7684\u4fee\u6539\u5bf9\u5176\u4ed6\u7ebf\u7a0b\u4e0d\u53ef\u89c1<\/td><\/tr><tr><td><strong>\u6307\u4ee4\u91cd\u6392\u5bfc\u81f4\u7684\u5f02\u5e38\u884c\u4e3a<\/strong><\/td><td>CPU \u4e3a\u4f18\u5316\u6027\u80fd\uff0c\u4f1a\u91cd\u6392\u5e8f\u4ee3\u7801\u6267\u884c\u987a\u5e8f\uff0c\u5f71\u54cd\u5e76\u53d1\u903b\u8f91<\/td><\/tr><tr><td><strong>\u6b7b\u9501<\/strong><\/td><td>\u591a\u4e2a\u7ebf\u7a0b\u5faa\u73af\u7b49\u5f85\u8d44\u6e90<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\u5178\u578b\u793a\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u793a\u4f8b 1\uff1a\u975e\u539f\u5b50\u64cd\u4f5c<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Counter {\n    private int count = 0;\n\n    public void increment() {\n        count++; \/\/ \u975e\u539f\u5b50\u64cd\u4f5c\uff1a\u8bfb -&gt; \u52a0 -&gt; \u5199\n    }\n\n    public int get() {\n        return count;\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u6267\u884c <code>count++<\/code>\uff0c<strong>\u6700\u7ec8 count \u7684\u503c\u4f1a\u6bd4\u9884\u671f\u5c0f<\/strong>\uff0c\u56e0\u4e3a <code>++<\/code> \u662f\u590d\u5408\u64cd\u4f5c\uff08\u8bfb-\u6539-\u5199\uff09\u4e0d\u662f\u539f\u5b50\u6027\u7684\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u793a\u4f8b 2\uff1a\u5171\u4eab\u96c6\u5408\u64cd\u4f5c<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;String&gt; list = new ArrayList&lt;&gt;();\n\npublic void addItem(String item) {\n    list.add(item); \/\/ \u591a\u7ebf\u7a0b\u8bbf\u95ee\u4f1a\u629b\u51fa\u5f02\u5e38\u6216\u6570\u636e\u4e22\u5931\n}<\/code><\/pre>\n\n\n\n<p><code>ArrayList<\/code> \u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u5728\u5e76\u53d1\u573a\u666f\u4e0b\u5bb9\u6613\u629b\u51fa <code>ConcurrentModificationException<\/code>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u89e3\u51b3\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u7684\u65b9\u5f0f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u4f7f\u7528\u540c\u6b65\u673a\u5236<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>synchronized<\/code> \u5173\u952e\u5b57<\/li>\n\n\n\n<li><code>Lock<\/code> \u63a5\u53e3\u53ca\u5b9e\u73b0\u7c7b\uff0c\u5982 <code>ReentrantLock<\/code><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public synchronized void increment() {\n    count++;\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u4f7f\u7528\u5e76\u53d1\u5305\u4e2d\u7684\u539f\u5b50\u7c7b<\/h3>\n\n\n\n<p>\u5982 <code>AtomicInteger<\/code>\u3001<code>LongAdder<\/code> \u7b49\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>AtomicInteger count = new AtomicInteger(0);\n\npublic void increment() {\n    count.incrementAndGet(); \/\/ \u539f\u5b50\u6027+\u53ef\u89c1\u6027\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u4f7f\u7528\u7ebf\u7a0b\u5b89\u5168\u7684\u6570\u636e\u7ed3\u6784<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u539f\u7c7b\u578b<\/th><th>\u66ff\u4ee3\u4e3a<\/th><\/tr><\/thead><tbody><tr><td><code>ArrayList<\/code><\/td><td><code>CopyOnWriteArrayList<\/code><\/td><\/tr><tr><td><code>HashMap<\/code><\/td><td><code>ConcurrentHashMap<\/code><\/td><\/tr><tr><td><code>Queue<\/code><\/td><td><code>ConcurrentLinkedQueue<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u907f\u514d\u5171\u4eab\uff08\u7ebf\u7a0b\u5c01\u95ed\uff09<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53ea\u5728\u672c\u5730\u7ebf\u7a0b\u4e2d\u4f7f\u7528\u53d8\u91cf\uff0c\u4e0d\u5171\u4eab\u5c31\u6ca1\u6709\u51b2\u7a81<\/li>\n\n\n\n<li>\u5982 ThreadLocal\uff1a\u7ebf\u7a0b\u672c\u5730\u5b58\u50a8<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>ThreadLocal&lt;Integer&gt; threadLocalVar = new ThreadLocal&lt;&gt;();<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5. \u52a0\u5165\u53ef\u89c1\u6027\u4fdd\u8bc1\uff08<code>volatile<\/code>\uff09<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9002\u7528\u4e8e\u6807\u5fd7\u4f4d\u573a\u666f<\/li>\n\n\n\n<li>\u80fd\u4fdd\u8bc1\u5199\u5165\u540e\u5176\u4ed6\u7ebf\u7a0b\u53ef\u89c1\uff0c\u4f46<strong>\u4e0d\u80fd\u4fdd\u8bc1\u539f\u5b50\u6027<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>private volatile boolean running = true;<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u7ebf\u7a0b\u5b89\u5168\u8bbe\u8ba1\u539f\u5219\uff08Java \u5e76\u53d1\u7f16\u7a0b\u5b9e\u6218\uff09<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u539f\u5219<\/th><th>\u542b\u4e49<\/th><\/tr><\/thead><tbody><tr><td>\u539f\u5b50\u6027<\/td><td>\u6574\u4e2a\u64cd\u4f5c\u8981\u4e48\u5b8c\u6210\uff0c\u8981\u4e48\u4e0d\u6267\u884c<\/td><\/tr><tr><td>\u53ef\u89c1\u6027<\/td><td>\u4e00\u4e2a\u7ebf\u7a0b\u7684\u4fee\u6539\u5bf9\u5176\u4ed6\u7ebf\u7a0b\u7acb\u5373\u53ef\u89c1<\/td><\/tr><tr><td>\u6709\u5e8f\u6027<\/td><td>\u7a0b\u5e8f\u6267\u884c\u987a\u5e8f\u7b26\u5408\u903b\u8f91\uff0c\u4e0d\u56e0 CPU \u91cd\u6392\u5931\u5e8f<\/td><\/tr><tr><td>\u4e0d\u53d8\u6027<\/td><td>\u5c3d\u91cf\u8bbe\u8ba1\u4e3a\u4e0d\u53ef\u53d8\u5bf9\u8c61\uff08\u5982 <code>String<\/code>\uff09<\/td><\/tr><tr><td>\u6700\u5c0f\u5171\u4eab<\/td><td>\u6700\u5c0f\u5316\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\u7684\u6570\u636e\u91cf<\/td><\/tr><tr><td>\u907f\u514d\u6b7b\u9501<\/td><td>\u8c28\u614e\u6301\u9501\u987a\u5e8f\uff0c\u907f\u514d\u5faa\u73af\u4f9d\u8d56\u8d44\u6e90<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001\u7ebf\u7a0b\u5b89\u5168 vs \u975e\u7ebf\u7a0b\u5b89\u5168\u7c7b\u5bf9\u6bd4<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7c7b\u540d<\/th><th>\u662f\u5426\u7ebf\u7a0b\u5b89\u5168<\/th><th>\u8bf4\u660e<\/th><\/tr><\/thead><tbody><tr><td><code>String<\/code><\/td><td>\u2705<\/td><td>\u4e0d\u53ef\u53d8<\/td><\/tr><tr><td><code>StringBuilder<\/code><\/td><td>\u274c<\/td><td>\u975e\u7ebf\u7a0b\u5b89\u5168<\/td><\/tr><tr><td><code>StringBuffer<\/code><\/td><td>\u2705<\/td><td>\u52a0\u4e86 synchronized<\/td><\/tr><tr><td><code>HashMap<\/code><\/td><td>\u274c<\/td><td>\u591a\u7ebf\u7a0b\u5e76\u53d1\u4f1a\u5931\u6548<\/td><\/tr><tr><td><code>ConcurrentHashMap<\/code><\/td><td>\u2705<\/td><td>\u9ad8\u6027\u80fd\u7ebf\u7a0b\u5b89\u5168 Map<\/td><\/tr><tr><td><code>SimpleDateFormat<\/code><\/td><td>\u274c<\/td><td>\u591a\u7ebf\u7a0b\u5171\u7528\u4f1a\u51fa\u9519<\/td><\/tr><tr><td><code>ThreadLocal&lt;SimpleDateFormat&gt;<\/code><\/td><td>\u2705<\/td><td>\u6bcf\u4e2a\u7ebf\u7a0b\u4e00\u4efd\uff0c\u7ebf\u7a0b\u5c01\u95ed<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516b\u3001\u63a8\u8350\u8d44\u6599\u94fe\u63a5<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd17 <a href=\"https:\/\/docs.oracle.com\/javase\/tutorial\/essential\/concurrency\/index.html\">Java \u5b98\u65b9\u5e76\u53d1\u6559\u7a0b<\/a><\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/jcip.net\/\">Java \u5e76\u53d1\u7f16\u7a0b\u5b9e\u6218<\/a><\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/docs.oracle.com\/javase\/specs\/jls\/se8\/html\/jls-17.html\">Java Memory Model\uff08JMM\uff09\u4ecb\u7ecd<\/a><\/li>\n<\/ul>\n\n\n\n<hr 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