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id=\"%E6%8E%A5%E5%8F%A3%E5%92%8C%E6%8A%BD%E8%B1%A1%E7%B1%BB%E6%9C%89%E4%BB%80%E4%B9%88%E5%85%B1%E5%90%8C%E7%82%B9%E5%92%8C%E5%8C%BA%E5%88%AB%EF%BC%9F\"><\/span>\u63a5\u53e3\u548c\u62bd\u8c61\u7c7b\u6709\u4ec0\u4e48\u5171\u540c\u70b9\u548c\u533a\u522b\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"%E6%8E%A5%E5%8F%A3%E5%92%8C%E6%8A%BD%E8%B1%A1%E7%B1%BB%E7%9A%84%E5%85%B1%E5%90%8C%E7%82%B9\"><\/span>\u63a5\u53e3\u548c\u62bd\u8c61\u7c7b\u7684\u5171\u540c\u70b9<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><strong>\u5b9e\u4f8b\u5316\uff1a<\/strong>\u63a5\u53e3\u548c\u62bd\u8c61\u7c7b\u90fd\u4e0d\u80fd\u76f4\u63a5\u5b9e\u4f8b\u5316\uff0c\u53ea\u80fd\u88ab\u5b9e\u73b0\uff08\u63a5\u53e3\uff09\u6216\u7ee7\u627f\uff08\u62bd\u8c61\u7c7b\uff09\u540e\u624d\u80fd\u521b\u5efa\u5177\u4f53\u7684\u5bf9\u8c61\u3002<br \/>\n<strong>\u62bd\u8c61\u65b9\u6cd5\uff1a<\/strong>\u63a5\u53e3\u548c\u62bd\u8c61\u7c7b\u90fd\u53ef\u4ee5\u5305\u542b\u62bd\u8c61\u65b9\u6cd5\u3002\u62bd\u8c61\u65b9\u6cd5\u6ca1\u6709\u65b9\u6cd5\u4f53\uff0c\u5fc5\u987b\u5728\u5b50\u7c7b\u6216\u5b9e\u73b0\u7c7b\u4e2d\u5b9e\u73b0\u3002<\/p>\n<h4><span class=\"ez-toc-section\" id=\"%E6%8E%A5%E5%8F%A3%E5%92%8C%E6%8A%BD%E8%B1%A1%E7%B1%BB%E7%9A%84%E5%8C%BA%E5%88%AB\"><\/span>\u63a5\u53e3\u548c\u62bd\u8c61\u7c7b\u7684\u533a\u522b<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><strong>\u8bbe\u8ba1\u76ee\u7684\uff1a<\/strong>\u63a5\u53e3\u4e3b\u8981\u7528\u4e8e\u5bf9\u7c7b\u7684\u884c\u4e3a\u8fdb\u884c\u7ea6\u675f\uff0c\u4f60\u5b9e\u73b0\u4e86\u67d0\u4e2a\u63a5\u53e3\u5c31\u5177\u6709\u4e86\u5bf9\u5e94\u7684\u884c\u4e3a\u3002\u62bd\u8c61\u7c7b\u4e3b\u8981\u7528\u4e8e\u4ee3\u7801\u590d\u7528\uff0c\u5f3a\u8c03\u7684\u662f\u6240\u5c5e\u5173\u7cfb\u3002<br \/>\n<strong>\u7ee7\u627f\u548c\u5b9e\u73b0\uff1a<\/strong>\u4e00\u4e2a\u7c7b\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u7c7b\uff08\u5305\u62ec\u62bd\u8c61\u7c7b\uff09\uff0c\u56e0\u4e3a Java \u4e0d\u652f\u6301\u591a\u7ee7\u627f\u3002\u4f46\u4e00\u4e2a\u7c7b\u53ef\u4ee5\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3\uff0c\u4e00\u4e2a\u63a5\u53e3\u4e5f\u53ef\u4ee5\u7ee7\u627f\u591a\u4e2a\u5176\u4ed6\u63a5\u53e3\u3002<br \/>\n<strong>\u6210\u5458\u53d8\u91cf\uff1a<\/strong>\u63a5\u53e3\u4e2d\u7684\u6210\u5458\u53d8\u91cf\u53ea\u80fd\u662f public static final \u7c7b\u578b\u7684\uff0c\u4e0d\u80fd\u88ab\u4fee\u6539\u4e14\u5fc5\u987b\u6709\u521d\u59cb\u503c\u3002\u62bd\u8c61\u7c7b\u7684\u6210\u5458\u53d8\u91cf\u53ef\u4ee5\u6709\u4efb\u4f55\u4fee\u9970\u7b26\uff08private, protected, public\uff09\uff0c\u53ef\u4ee5\u5728\u5b50\u7c7b\u4e2d\u88ab\u91cd\u65b0\u5b9a\u4e49\u6216\u8d4b\u503c\u3002<br \/>\n<strong>\u65b9\u6cd5\uff1a<\/strong> Java 8 \u4e4b\u524d\uff0c\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u9ed8\u8ba4\u662f public abstract \uff0c\u4e5f\u5c31\u662f\u53ea\u80fd\u6709\u65b9\u6cd5\u58f0\u660e\u3002\u81ea Java 8 \u8d77\uff0c\u53ef\u4ee5\u5728\u63a5\u53e3\u4e2d\u5b9a\u4e49 default\uff08\u9ed8\u8ba4\uff09 \u65b9\u6cd5\u548c static \uff08\u9759\u6001\uff09\u65b9\u6cd5\u3002 \u81ea Java 9 \u8d77\uff0c\u63a5\u53e3\u53ef\u4ee5\u5305\u542b private \u65b9\u6cd5\u3002\u62bd\u8c61\u7c7b\u53ef\u4ee5\u5305\u542b\u62bd\u8c61\u65b9\u6cd5\u548c\u975e\u62bd\u8c61\u65b9\u6cd5\u3002\u62bd\u8c61\u65b9\u6cd5\u6ca1\u6709\u65b9\u6cd5\u4f53\uff0c\u5fc5\u987b\u5728\u5b50\u7c7b\u4e2d\u5b9e\u73b0\u3002\u975e\u62bd\u8c61\u65b9\u6cd5\u6709\u5177\u4f53\u5b9e\u73b0\uff0c\u53ef\u4ee5\u76f4\u63a5\u5728\u62bd\u8c61\u7c7b\u4e2d\u4f7f\u7528\u6216\u5728\u5b50\u7c7b\u4e2d\u91cd\u5199\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E6%B7%B1%E6%8B%B7%E8%B4%9D%E5%92%8C%E6%B5%85%E6%8B%B7%E8%B4%9D%E5%8C%BA%E5%88%AB%E4%BA%86%E8%A7%A3%E5%90%97%EF%BC%9F%E4%BB%80%E4%B9%88%E6%98%AF%E5%BC%95%E7%94%A8%E6%8B%B7%E8%B4%9D%EF%BC%9F\"><\/span>\u6df1\u62f7\u8d1d\u548c\u6d45\u62f7\u8d1d\u533a\u522b\u4e86\u89e3\u5417\uff1f\u4ec0\u4e48\u662f\u5f15\u7528\u62f7\u8d1d\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>\u6d45\u62f7\u8d1d\uff1a<\/strong>\u6d45\u62f7\u8d1d\u4f1a\u5728\u5806\u4e0a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\uff08\u533a\u522b\u4e8e\u5f15\u7528\u62f7\u8d1d\u7684\u4e00\u70b9\uff09\uff0c\u4e0d\u8fc7\uff0c\u5982\u679c\u539f\u5bf9\u8c61\u5185\u90e8\u7684\u5c5e\u6027\u662f\u5f15\u7528\u7c7b\u578b\u7684\u8bdd\uff0c\u6d45\u62f7\u8d1d\u4f1a\u76f4\u63a5\u590d\u5236\u5185\u90e8\u5bf9\u8c61\u7684\u5f15\u7528\u5730\u5740\uff0c\u4e5f\u5c31\u662f\u8bf4\u62f7\u8d1d\u5bf9\u8c61\u548c\u539f\u5bf9\u8c61\u5171\u7528\u540c\u4e00\u4e2a\u5185\u90e8\u5bf9\u8c61\u3002<br \/>\n<strong>\u6df1\u62f7\u8d1d\uff1a<\/strong>\u6df1\u62f7\u8d1d\u4f1a\u5b8c\u5168\u590d\u5236\u6574\u4e2a\u5bf9\u8c61\uff0c\u5305\u62ec\u8fd9\u4e2a\u5bf9\u8c61\u6240\u5305\u542b\u7684\u5185\u90e8\u5bf9\u8c61\u3002<br \/>\n\u6d45\u62f7\u8d1d<br \/>\n\u6d45\u62f7\u8d1d\u7684\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff0c\u6211\u4eec\u8fd9\u91cc\u5b9e\u73b0\u4e86 Cloneable \u63a5\u53e3\uff0c\u5e76\u91cd\u5199\u4e86 clone() \u65b9\u6cd5\u3002<br \/>\nclone() \u65b9\u6cd5\u7684\u5b9e\u73b0\u5f88\u7b80\u5355\uff0c\u76f4\u63a5\u8c03\u7528\u7684\u662f\u7236\u7c7b Object \u7684 clone() \u65b9\u6cd5\u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">public class Address implements Cloneable{\n    private String name;\n    \/\/ \u7701\u7565\u6784\u9020\u51fd\u6570\u3001Getter&amp;Setter\u65b9\u6cd5\n    @Override\n    public Address clone() {\n        try {\n            return (Address) super.clone();\n        } catch (CloneNotSupportedException e) {\n            throw new AssertionError();\n        }\n    }\n}\n\npublic class Person implements Cloneable {\n    private Address address;\n    \/\/ \u7701\u7565\u6784\u9020\u51fd\u6570\u3001Getter&amp;Setter\u65b9\u6cd5\n    @Override\n    public Person clone() {\n        try {\n            Person person = (Person) super.clone();\n            return person;\n        } catch (CloneNotSupportedException e) {\n            throw new AssertionError();\n        }\n    }\n}\n\nPerson person1 = new Person(new Address(&quot;\u6b66\u6c49&quot;));\nPerson person1Copy = person1.clone();\n\/\/ true\nSystem.out.println(person1.getAddress() == person1Copy.getAddress());<\/code><\/pre>\n<p>\u4ece\u8f93\u51fa\u7ed3\u6784\u5c31\u53ef\u4ee5\u770b\u51fa\uff0c person1 \u7684\u514b\u9686\u5bf9\u8c61\u548c person1 \u4f7f\u7528\u7684\u4ecd\u7136\u662f\u540c\u4e00\u4e2a Address \u5bf9\u8c61<\/p>\n<p>\u6df1\u62f7\u8d1d<br \/>\n\u8fd9\u91cc\u6211\u4eec\u7b80\u5355\u5bf9 Person \u7c7b\u7684 clone() \u65b9\u6cd5\u8fdb\u884c\u4fee\u6539\uff0c\u8fde\u5e26\u7740\u8981\u628a Person \u5bf9\u8c61\u5185\u90e8\u7684 Address \u5bf9\u8c61\u4e00\u8d77\u590d\u5236\u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">@Override\npublic Person clone() {\n    try {\n        Person person = (Person) super.clone();\n        person.setAddress(person.getAddress().clone());\n        return person;\n    } catch (CloneNotSupportedException e) {\n        throw new AssertionError();\n    }\n}\n\nPerson person1 = new Person(new Address(&quot;\u6b66\u6c49&quot;));\nPerson person1Copy = person1.clone();\n\/\/ false\nSystem.out.println(person1.getAddress() == person1Copy.getAddress());<\/code><\/pre>\n<p>\u4ece\u8f93\u51fa\u7ed3\u6784\u5c31\u53ef\u4ee5\u770b\u51fa\uff0c\u663e\u7136 person1 \u7684\u514b\u9686\u5bf9\u8c61\u548c person1 \u5305\u542b\u7684 Address \u5bf9\u8c61\u5df2\u7ecf\u662f\u4e0d\u540c\u7684\u4e86\u3002<br \/>\n\u90a3\u4ec0\u4e48\u662f\u5f15\u7528\u62f7\u8d1d\u5462\uff1f \u7b80\u5355\u6765\u8bf4\uff0c\u5f15\u7528\u62f7\u8d1d\u5c31\u662f\u4e24\u4e2a\u4e0d\u540c\u7684\u5f15\u7528\u6307\u5411\u540c\u4e00\u4e2a\u5bf9\u8c61\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752302488042.png\" alt=\"file\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"_%E5%92%8C_equals_%E7%9A%84%E5%8C%BA%E5%88%AB\"><\/span>== \u548c equals() \u7684\u533a\u522b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>== \u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b\u7684\u4f5c\u7528\u6548\u679c\u662f\u4e0d\u540c\u7684\uff1a<\/strong><br \/>\n\u5bf9\u4e8e\u57fa\u672c\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c== \u6bd4\u8f83\u7684\u662f\u503c\u3002<br \/>\n\u5bf9\u4e8e\u5f15\u7528\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c== \u6bd4\u8f83\u7684\u662f\u5bf9\u8c61\u7684\u5185\u5b58\u5730\u5740\u3002<\/p>\n<p>equals() \u65b9\u6cd5\u5b58\u5728\u4e24\u79cd\u4f7f\u7528\u60c5\u51b5\uff1a\u7c7b\u6ca1\u6709\u91cd\u5199 equals()\u65b9\u6cd5\uff1a\u901a\u8fc7equals()\u6bd4\u8f83\u8be5\u7c7b\u7684\u4e24\u4e2a\u5bf9\u8c61\u65f6\uff0c\u7b49\u4ef7\u4e8e\u901a\u8fc7\u201c==\u201d\u6bd4\u8f83\u8fd9\u4e24\u4e2a\u5bf9\u8c61\uff0c\u4f7f\u7528\u7684\u9ed8\u8ba4\u662f Object\u7c7bequals()\u65b9\u6cd5\u3002\u7c7b\u91cd\u5199\u4e86 equals()\u65b9\u6cd5\uff1a\u4e00\u822c\u6211\u4eec\u90fd\u91cd\u5199 equals()\u65b9\u6cd5\u6765\u6bd4\u8f83\u4e24\u4e2a\u5bf9\u8c61\u4e2d\u7684\u5c5e\u6027\u662f\u5426\u76f8\u7b49\uff1b\u82e5\u5b83\u4eec\u7684\u5c5e\u6027\u76f8\u7b49\uff0c\u5219\u8fd4\u56de true(\u5373\uff0c\u8ba4\u4e3a\u8fd9\u4e24\u4e2a\u5bf9\u8c61\u76f8\u7b49)\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"hashCode_%E6%9C%89%E4%BB%80%E4%B9%88%E7%94%A8%EF%BC%9F\"><\/span>hashCode() \u6709\u4ec0\u4e48\u7528\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>hashCode() \u7684\u4f5c\u7528\u662f\u83b7\u53d6\u54c8\u5e0c\u7801\uff08int \u6574\u6570\uff09\uff0c\u4e5f\u79f0\u4e3a\u6563\u5217\u7801\u3002\u8fd9\u4e2a\u54c8\u5e0c\u7801\u7684\u4f5c\u7528\u662f\u786e\u5b9a\u8be5\u5bf9\u8c61\u5728\u54c8\u5e0c\u8868\u4e2d\u7684\u7d22\u5f15\u4f4d\u7f6e\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752311230855.png\" alt=\"file\" \/><\/p>\n<p>hashCode() \u5b9a\u4e49\u5728 JDK \u7684 Object \u7c7b\u4e2d\uff0c\u8fd9\u5c31\u610f\u5473\u7740 Java \u4e2d\u7684\u4efb\u4f55\u7c7b\u90fd\u5305\u542b\u6709 hashCode() \u51fd\u6570\u3002\u53e6\u5916\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1aObject \u7684 hashCode() \u65b9\u6cd5\u662f\u672c\u5730\u65b9\u6cd5\uff0c\u4e5f\u5c31\u662f\u7528 C \u8bed\u8a00\u6216 C++ \u5b9e\u73b0\u7684\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E9%82%A3%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%A4%E4%B8%AA%E5%AF%B9%E8%B1%A1%E6%9C%89%E7%9B%B8%E5%90%8C%E7%9A%84_hashCode_%E5%80%BC%EF%BC%8C%E5%AE%83%E4%BB%AC%E4%B9%9F%E4%B8%8D%E4%B8%80%E5%AE%9A%E6%98%AF%E7%9B%B8%E7%AD%89%E7%9A%84%EF%BC%9F\"><\/span>\u90a3\u4e3a\u4ec0\u4e48\u4e24\u4e2a\u5bf9\u8c61\u6709\u76f8\u540c\u7684 hashCode \u503c\uff0c\u5b83\u4eec\u4e5f\u4e0d\u4e00\u5b9a\u662f\u76f8\u7b49\u7684\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u56e0\u4e3a hashCode() \u6240\u4f7f\u7528\u7684\u54c8\u5e0c\u7b97\u6cd5\u4e5f\u8bb8\u521a\u597d\u4f1a\u8ba9\u591a\u4e2a\u5bf9\u8c61\u4f20\u56de\u76f8\u540c\u7684\u54c8\u5e0c\u503c\u3002\u8d8a\u7cdf\u7cd5\u7684\u54c8\u5e0c\u7b97\u6cd5\u8d8a\u5bb9\u6613\u78b0\u649e\uff0c\u4f46\u8fd9\u4e5f\u4e0e\u6570\u636e\u503c\u57df\u5206\u5e03\u7684\u7279\u6027\u6709\u5173\uff08\u6240\u8c13\u54c8\u5e0c\u78b0\u649e\u4e5f\u5c31\u662f\u6307\u7684\u662f\u4e0d\u540c\u7684\u5bf9\u8c61\u5f97\u5230\u76f8\u540c\u7684 hashCode )\u3002<br \/>\n<strong>\u603b\u7ed3\u4e0b\u6765\u5c31\u662f\uff1a<\/strong><br \/>\n\u5982\u679c\u4e24\u4e2a\u5bf9\u8c61\u7684hashCode \u503c\u76f8\u7b49\uff0c\u90a3\u8fd9\u4e24\u4e2a\u5bf9\u8c61\u4e0d\u4e00\u5b9a\u76f8\u7b49\uff08\u54c8\u5e0c\u78b0\u649e\uff09\u3002<br \/>\n\u5982\u679c\u4e24\u4e2a\u5bf9\u8c61\u7684hashCode \u503c\u76f8\u7b49\u5e76\u4e14equals()\u65b9\u6cd5\u4e5f\u8fd4\u56de true\uff0c\u6211\u4eec\u624d\u8ba4\u4e3a\u8fd9\u4e24\u4e2a\u5bf9\u8c61\u76f8\u7b49\u3002<br \/>\n\u5982\u679c\u4e24\u4e2a\u5bf9\u8c61\u7684hashCode \u503c\u4e0d\u76f8\u7b49\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u76f4\u63a5\u8ba4\u4e3a\u8fd9\u4e24\u4e2a\u5bf9\u8c61\u4e0d\u76f8\u7b49\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"String%E3%80%81StringBuffer%E3%80%81StringBuilder_%E7%9A%84%E5%8C%BA%E5%88%AB%EF%BC%9F\"><\/span>String\u3001StringBuffer\u3001StringBuilder \u7684\u533a\u522b\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>\u53ef\u53d8\u6027\uff1a<\/strong><br \/>\nString \u662f\u4e0d\u53ef\u53d8\u7684\u3002StringBuilder \u4e0e StringBuffer \u90fd\u7ee7\u627f\u81ea AbstractStringBuilder \u7c7b\uff0c\u5728 AbstractStringBuilder \u4e2d\u4e5f\u662f\u4f7f\u7528\u5b57\u7b26\u6570\u7ec4\u4fdd\u5b58\u5b57\u7b26\u4e32\uff0c\u4e0d\u8fc7\u6ca1\u6709\u4f7f\u7528 final \u548c private \u5173\u952e\u5b57\u4fee\u9970\uff0c\u6700\u5173\u952e\u7684\u662f\u8fd9\u4e2a AbstractStringBuilder \u7c7b\u8fd8\u63d0\u4f9b\u4e86\u5f88\u591a\u4fee\u6539\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5\u6bd4\u5982 append \u65b9\u6cd5\u3002<br \/>\n<strong>\u7ebf\u7a0b\u5b89\u5168\u6027\uff1a<\/strong><br \/>\nString \u4e2d\u7684\u5bf9\u8c61\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u4e5f\u5c31\u53ef\u4ee5\u7406\u89e3\u4e3a\u5e38\u91cf\uff0c\u7ebf\u7a0b\u5b89\u5168\u3002AbstractStringBuilder \u662f StringBuilder \u4e0e StringBuffer \u7684\u516c\u5171\u7236\u7c7b\uff0c\u5b9a\u4e49\u4e86\u4e00\u4e9b\u5b57\u7b26\u4e32\u7684\u57fa\u672c\u64cd\u4f5c\uff0c\u5982 expandCapacity\u3001append\u3001insert\u3001indexOf \u7b49\u516c\u5171\u65b9\u6cd5\u3002StringBuffer \u5bf9\u65b9\u6cd5\u52a0\u4e86\u540c\u6b65\u9501\u6216\u8005\u5bf9\u8c03\u7528\u7684\u65b9\u6cd5\u52a0\u4e86\u540c\u6b65\u9501\uff0c\u6240\u4ee5\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002StringBuilder \u5e76\u6ca1\u6709\u5bf9\u65b9\u6cd5\u8fdb\u884c\u52a0\u540c\u6b65\u9501\uff0c\u6240\u4ee5\u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<br \/>\n<strong>\u6027\u80fd\uff1a<\/strong><br \/>\n\u6bcf\u6b21\u5bf9 String \u7c7b\u578b\u8fdb\u884c\u6539\u53d8\u7684\u65f6\u5019\uff0c\u90fd\u4f1a\u751f\u6210\u4e00\u4e2a\u65b0\u7684 String \u5bf9\u8c61\uff0c\u7136\u540e\u5c06\u6307\u9488\u6307\u5411\u65b0\u7684 String \u5bf9\u8c61\u3002StringBuffer \u6bcf\u6b21\u90fd\u4f1a\u5bf9 StringBuffer \u5bf9\u8c61\u672c\u8eab\u8fdb\u884c\u64cd\u4f5c\uff0c\u800c\u4e0d\u662f\u751f\u6210\u65b0\u7684\u5bf9\u8c61\u5e76\u6539\u53d8\u5bf9\u8c61\u5f15\u7528\u3002\u76f8\u540c\u60c5\u51b5\u4e0b\u4f7f\u7528 StringBuilder \u76f8\u6bd4\u4f7f\u7528 StringBuffer \u4ec5\u80fd\u83b7\u5f97 10%~15% \u5de6\u53f3\u7684\u6027\u80fd\u63d0\u5347\uff0c\u4f46\u5374\u8981\u5192\u591a\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\u98ce\u9669\u3002<\/p>\n<p><strong>\u5bf9\u4e8e\u4e09\u8005\u4f7f\u7528\u7684\u603b\u7ed3\uff1a<\/strong><br \/>\n\u64cd\u4f5c\u5c11\u91cf\u7684\u6570\u636e: \u9002\u7528 String<br \/>\n\u5355\u7ebf\u7a0b\u64cd\u4f5c\u5b57\u7b26\u4e32\u7f13\u51b2\u533a\u4e0b\u64cd\u4f5c\u5927\u91cf\u6570\u636e: \u9002\u7528 StringBuilder<br \/>\n\u591a\u7ebf\u7a0b\u64cd\u4f5c\u5b57\u7b26\u4e32\u7f13\u51b2\u533a\u4e0b\u64cd\u4f5c\u5927\u91cf\u6570\u636e: \u9002\u7528 StringBuffer<\/p>\n<h3><span class=\"ez-toc-section\" id=\"String_%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%AF%E4%B8%8D%E5%8F%AF%E5%8F%98%E7%9A%84\"><\/span>String \u4e3a\u4ec0\u4e48\u662f\u4e0d\u53ef\u53d8\u7684?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>1\u3001\u4fdd\u5b58\u5b57\u7b26\u4e32\u7684\u6570\u7ec4\u88ab final \u4fee\u9970\u4e14\u4e3a\u79c1\u6709\u7684\uff0c\u5e76\u4e14String \u7c7b\u6ca1\u6709\u63d0\u4f9b\/\u66b4\u9732\u4fee\u6539\u8fd9\u4e2a\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5\u3002<br \/>\n2\u3001String \u7c7b\u88ab final \u4fee\u9970\u5bfc\u81f4\u5176\u4e0d\u80fd\u88ab\u7ee7\u627f\uff0c\u8fdb\u800c\u907f\u514d\u4e86\u5b50\u7c7b\u7834\u574f String \u4e0d\u53ef\u53d8<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">public final class String implements java.io.Serializable, Comparable&lt;String&gt;, CharSequence {\n    private final char value[];\n  \/\/...\n}<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Java_9_%E4%B8%BA%E4%BD%95%E8%A6%81%E5%B0%86_String_%E7%9A%84%E5%BA%95%E5%B1%82%E5%AE%9E%E7%8E%B0%E7%94%B1_char_%E6%94%B9%E6%88%90%E4%BA%86_byte\"><\/span>Java 9 \u4e3a\u4f55\u8981\u5c06 String \u7684\u5e95\u5c42\u5b9e\u73b0\u7531 char[] \u6539\u6210\u4e86 byte[] ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u65b0\u7248\u7684 String \u5176\u5b9e\u652f\u6301\u4e24\u4e2a\u7f16\u7801\u65b9\u6848\uff1aLatin-1 \u548c UTF-16\u3002\u5982\u679c\u5b57\u7b26\u4e32\u4e2d\u5305\u542b\u7684\u6c49\u5b57\u6ca1\u6709\u8d85\u8fc7 Latin-1 \u53ef\u8868\u793a\u8303\u56f4\u5185\u7684\u5b57\u7b26\uff0c\u90a3\u5c31\u4f1a\u4f7f\u7528 Latin-1 \u4f5c\u4e3a\u7f16\u7801\u65b9\u6848\u3002Latin-1 \u7f16\u7801\u65b9\u6848\u4e0b\uff0cbyte \u5360\u4e00\u4e2a\u5b57\u8282(8 \u4f4d)\uff0cchar \u5360\u7528 2 \u4e2a\u5b57\u8282\uff0816\uff09\uff0cbyte \u76f8\u8f83 char \u8282\u7701\u4e00\u534a\u7684\u5185\u5b58\u7a7a\u95f4<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E5%AD%97%E7%AC%A6%E4%B8%B2%E5%B8%B8%E9%87%8F%E6%B1%A0%E7%9A%84%E4%BD%9C%E7%94%A8%E4%BA%86%E8%A7%A3%E5%90%97%EF%BC%9F\"><\/span>\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u7684\u4f5c\u7528\u4e86\u89e3\u5417\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60 \u662f JVM \u4e3a\u4e86\u63d0\u5347\u6027\u80fd\u548c\u51cf\u5c11\u5185\u5b58\u6d88\u8017\u9488\u5bf9\u5b57\u7b26\u4e32\uff08String \u7c7b\uff09\u4e13\u95e8\u5f00\u8f9f\u7684\u4e00\u5757\u533a\u57df\uff0c\u4e3b\u8981\u76ee\u7684\u662f\u4e3a\u4e86\u907f\u514d\u5b57\u7b26\u4e32\u7684\u91cd\u590d\u521b\u5efa\u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">\/\/ \u5728\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u521b\u5efa\u5b57\u7b26\u4e32\u5bf9\u8c61 \u201dab\u201c\n\/\/ \u5c06\u5b57\u7b26\u4e32\u5bf9\u8c61 \u201dab\u201c \u7684\u5f15\u7528\u8d4b\u503c\u7ed9 aa\nString aa = &quot;ab&quot;;\n\/\/ \u76f4\u63a5\u8fd4\u56de\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u5b57\u7b26\u4e32\u5bf9\u8c61 \u201dab\u201c\uff0c\u8d4b\u503c\u7ed9\u5f15\u7528 bb\nString bb = &quot;ab&quot;;\nSystem.out.println(aa==bb); \/\/ true<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u9762\u5411\u5bf9\u8c61\u548c\u9762\u5411\u8fc7\u7a0b\u7684\u533a\u522b \u9762\u5411\u8fc7\u7a0b\u7f16\u7a0b\uff08POP\uff09\uff1a\u9762\u5411\u8fc7\u7a0b\u628a\u89e3\u51b3\u95ee\u9898\u7684\u8fc7\u7a0b\u62c6\u6210\u4e00\u4e2a\u4e2a\u65b9\u6cd5\uff0c\u901a\u8fc7\u4e00\u4e2a\u4e2a\u65b9\u6cd5\u7684\u6267\u884c\u89e3\u51b3\u95ee\u9898\u3002 \u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff08OOP\uff09\uff1a\u9762\u5411\u5bf9\u8c61\u4f1a\u5148\u62bd\u8c61\u51fa\u5bf9\u8c61\uff0c\u7136\u540e\u7528\u5bf9\u8c61\u6267\u884c\u65b9\u6cd5\u7684\u65b9\u5f0f\u89e3\u51b3\u95ee\u9898\u3002 \u76f8\u6bd4\u8f83\u4e8e POP\uff0cOOP \u5f00\u53d1\u7684\u7a0b\u5e8f\u4e00\u822c\u5177\u6709\u4e0b\u9762\u8fd9\u4e9b\u4f18\u70b9\uff1a \u6613\u7ef4\u62a4\uff1a\u7531\u4e8e\u826f\u597d\u7684\u7ed3\u6784\u548c\u5c01\u88c5\u6027\uff0cOOP \u7a0b\u5e8f\u901a\u5e38\u66f4\u5bb9\u6613\u7ef4\u62a4\u3002 \u6613\u590d\u7528\uff1a\u901a\u8fc7\u7ee7\u627f\u548c\u591a\u6001\uff0cOOP \u8bbe\u8ba1\u4f7f\u5f97\u4ee3\u7801\u66f4\u5177\u590d\u7528\u6027\uff0c\u65b9\u4fbf\u6269\u5c55\u529f\u80fd\u3002  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":116,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-114","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/posts\/114","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/comments?post=114"}],"version-history":[{"count":4,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/posts\/114\/revisions"}],"predecessor-version":[{"id":120,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/posts\/114\/revisions\/120"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/media\/116"}],"wp:attachment":[{"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/media?parent=114"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/categories?post=114"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/tags?post=114"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}