{"id":833,"date":"2023-02-22T05:49:00","date_gmt":"2023-09-21T06:04:57","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%9c%a8java%e7%a4%ba%e4%be%8b%e4%b8%ad%e7%9a%84%e7%bb%a7%e6%89%bf\/"},"modified":"2025-08-03T11:48:29","modified_gmt":"2025-08-03T03:48:29","slug":"%e5%9c%a8java%e7%a4%ba%e4%be%8b%e4%b8%ad%e7%9a%84%e7%bb%a7%e6%89%bf","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e7%a4%ba%e4%be%8b%e4%b8%ad%e7%9a%84%e7%bb%a7%e6%89%bf\/","title":{"rendered":"Java\u7ee7\u627f\u8be6\u89e3\uff1a\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u7684\u7ee7\u627f\u6982\u5ff5\u4e0e\u5b9e\u4f8b\u6559\u7a0b"},"content":{"rendered":"<h2>Java\u4e2d\u7684\u7ee7\u627f<\/h2>\n<p>\u5728Java\u4e2d\uff0c\u7ee7\u627f\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u6838\u5fc3\u6982\u5ff5\u4e4b\u4e00\u3002\u5f53\u4e24\u4e2a\u5bf9\u8c61\u4e4b\u95f4\u5b58\u5728&#8221;\u662f\u4e00\u4e2a&#8221;\uff08is-a\uff09\u5173\u7cfb\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Java\u7ee7\u627f\u3002\u5728Java\u4e2d\uff0c\u7ee7\u627f\u662f\u901a\u8fc7\u4f7f\u7528extends\u5173\u952e\u5b57\u6765\u5b9e\u73b0\u7684\u3002<\/p>\n<p>\u5728Java\u4e2d\uff0c\u7ee7\u627f\u662f\u901a\u8fc7\u4ece\u5176\u4ed6\u7c7b\u7ee7\u627f\u6765\u521b\u5efa\u7c7b\u7684\u5c42\u6b21\u7ed3\u6784\u7684\u65b9\u6cd5\u3002<\/p>\n<p>Java\u7684\u7ee7\u627f\u5177\u6709\u4f20\u9012\u6027\u2014\u2014\u5982\u679c\u8f7f\u8f66\uff08Sedan\uff09\u7ee7\u627f\u4e86\u6c7d\u8f66\uff08Car\uff09\uff0c\u800c\u6c7d\u8f66\u7ee7\u627f\u4e86\u8f66\u8f86\uff08Vehicle\uff09\uff0c\u90a3\u4e48\u8f7f\u8f66\u4e5f\u4f1a\u4ece\u8f66\u8f86\u7c7b\u7ee7\u627f\u3002\u8f66\u8f86\u6210\u4e3a\u6c7d\u8f66\u548c\u8f7f\u8f66\u7684\u7236\u7c7b\u3002<\/p>\n<p>\u7ee7\u627f\u5728Java\u5e94\u7528\u7a0b\u5e8f\u4e2d\u88ab\u5e7f\u6cdb\u4f7f\u7528\uff0c\u4f8b\u5982\u901a\u8fc7\u6269\u5c55Exception\u7c7b\u6765\u521b\u5efa\u4e00\u4e2a\u7279\u5b9a\u4e8e\u5e94\u7528\u7a0b\u5e8f\u7684\u5f02\u5e38\u7c7b\uff0c\u8be5\u7c7b\u5305\u542b\u66f4\u591a\u7684\u4fe1\u606f\uff0c\u5982\u9519\u8bef\u4ee3\u7801\uff0c\u4f8b\u5982NullPointerException\uff08\u7a7a\u6307\u9488\u5f02\u5e38\uff09\u3002<\/p>\n<h3>Java\u7ee7\u627f\u793a\u4f8b<\/h3>\n<p>\u6bcf\u4e2aJava\u7c7b\u90fd\u9690\u5f0f\u5730\u7ee7\u627f\u4e86java.lang.Object\u7c7b\u3002\u56e0\u6b64\uff0cObject\u7c7b\u4f4d\u4e8eJava\u7684\u7ee7\u627f\u5c42\u6b21\u7ed3\u6784\u7684\u9876\u5c42\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\uff0c\u4e86\u89e3\u5982\u4f55\u5728Java\u4e2d\u5b9e\u73b0\u7ee7\u627f\u3002<\/p>\n<h4>\u7236\u7c7b\uff1a\u52a8\u7269<\/h4>\n<pre class=\"post-pre\"><code>package com.Olivia.inheritance;\r\n\r\npublic class Animal {\r\n\r\n\tprivate boolean vegetarian;\r\n\r\n\tprivate String eats;\r\n\r\n\tprivate int noOfLegs;\r\n\r\n\tpublic Animal(){}\r\n\r\n\tpublic Animal(boolean veg, String food, int legs){\r\n\t\tthis.vegetarian = veg;\r\n\t\tthis.eats = food;\r\n\t\tthis.noOfLegs = legs;\r\n\t}\r\n\r\n\tpublic boolean isVegetarian() {\r\n\t\treturn vegetarian;\r\n\t}\r\n\r\n\tpublic void setVegetarian(boolean vegetarian) {\r\n\t\tthis.vegetarian = vegetarian;\r\n\t}\r\n\r\n\tpublic String getEats() {\r\n\t\treturn eats;\r\n\t}\r\n\r\n\tpublic void setEats(String eats) {\r\n\t\tthis.eats = eats;\r\n\t}\r\n\r\n\tpublic int getNoOfLegs() {\r\n\t\treturn noOfLegs;\r\n\t}\r\n\r\n\tpublic void setNoOfLegs(int noOfLegs) {\r\n\t\tthis.noOfLegs = noOfLegs;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u8fd9\u91cc\u7684\u57fa\u7c7b\u662f\u52a8\u7269\u3002\u8ba9\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u4ece\u52a8\u7269\u7c7b\u7ee7\u627f\u7684\u732b\u7c7b\u3002<\/p>\n<h4>\u5b50\u7c7b\uff1a\u732b<\/h4>\n<pre class=\"post-pre\"><code>package com.Olivia.inheritance;\r\n\r\npublic class Cat extends Animal{\r\n\r\n\tprivate String color;\r\n\r\n\tpublic Cat(boolean veg, String food, int legs) {\r\n\t\tsuper(veg, food, legs);\r\n\t\tthis.color=\"\u767d\u8272\";\r\n\t}\r\n\r\n\tpublic Cat(boolean veg, String food, int legs, String color){\r\n\t\tsuper(veg, food, legs);\r\n\t\tthis.color=color;\r\n\t}\r\n\r\n\tpublic String getColor() {\r\n\t\treturn color;\r\n\t}\r\n\r\n\tpublic void setColor(String color) {\r\n\t\tthis.color = color;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\uff0c\u6211\u4eec\u5728Java\u4e2d\u4f7f\u7528extends\u5173\u952e\u5b57\u6765\u5b9e\u73b0\u7ee7\u627f\u3002<\/p>\n<h2>Java \u7ee7\u627f\u6d4b\u8bd5\u7a0b\u5e8f<\/h2>\n<p>\u8ba9\u6211\u4eec\u7f16\u5199\u4e00\u4e2a\u7b80\u5355\u7684\u6d4b\u8bd5\u7c7b\u6765\u521b\u5efa\u4e00\u4e2a\u732b\u5bf9\u8c61\u5e76\u4f7f\u7528\u4e00\u4e9b\u5b83\u7684\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.inheritance;\r\n\r\npublic class AnimalInheritanceTest {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tCat cat = new Cat(false, \"\u725b\u5976\", 4, \"\u9ed1\u8272\");\r\n\r\n\t\tSystem.out.println(\"\u732b\u662f\u7d20\u98df\u52a8\u7269\u5417\uff1f\" + cat.isVegetarian());\r\n\t\tSystem.out.println(\"\u732b\u5403 \" + cat.getEats());\r\n\t\tSystem.out.println(\"\u732b\u6709 \" + cat.getNoOfLegs() + \" \u6761\u817f\u3002\");\r\n\t\tSystem.out.println(\"\u732b\u7684\u989c\u8272\u662f \" + cat.getColor());\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u7ed3\u679c\uff1a<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"Java\u7ee7\u627f\u793a\u4f8b\u7ed3\u679c\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648ecfa4b2f92e6c733f12\/18-0.jpg\" alt=\"Java\u7ee7\u627f\u793a\u4f8b\" \/><\/div>\n<p>\u732b\u7684\u7c7b\u6ca1\u6709getEats()\u65b9\u6cd5\uff0c\u4f46\u7a0b\u5e8f\u4ecd\u7136\u53ef\u4ee5\u8fd0\u884c\uff0c\u56e0\u4e3a\u5b83\u662f\u4ece\u52a8\u7269\u7c7b\u4e2d\u7ee7\u627f\u7684\u3002<\/p>\n<h2>\u91cd\u8981\u7684\u8981\u70b9<\/h2>\n<ol>\n<li>\u4ee3\u7801\u91cd\u7528\u662f\u7ee7\u627f\u7684\u6700\u91cd\u8981\u7684\u4f18\u52bf\uff0c\u56e0\u4e3a\u5b50\u7c7b\u7ee7\u627f\u4e86\u8d85\u7c7b\u7684\u53d8\u91cf\u548c\u65b9\u6cd5\u3002<\/li>\n<\/ol>\n<p>\u8d85\u7c7b\u7684\u79c1\u6709\u6210\u5458\u5bf9\u5b50\u7c7b\u6765\u8bf4\u662f\u4e0d\u53ef\u76f4\u63a5\u8bbf\u95ee\u7684\u3002\u5c31\u50cf\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cAnimal\u7c7b\u7684\u53d8\u91cfnoOfLegs\u5bf9Cat\u7c7b\u662f\u4e0d\u53ef\u8bbf\u95ee\u7684\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7getter\u548csetter\u65b9\u6cd5\u6765\u95f4\u63a5\u8bbf\u95ee\u3002<\/p>\n<p>\u53ea\u6709\u5f53\u8d85\u7c7b\u548c\u5b50\u7c7b\u5904\u4e8e\u540c\u4e00\u4e2a\u5305\u4e2d\u65f6\uff0c\u8d85\u7c7b\u7684\u9ed8\u8ba4\u8bbf\u95ee\u6210\u5458\u5bf9\u5b50\u7c7b\u624d\u53ef\u8bbf\u95ee\u3002<\/p>\n<p>\u8d85\u7c7b\u7684\u6784\u9020\u51fd\u6570\u4e0d\u4f1a\u88ab\u5b50\u7c7b\u7ee7\u627f\u3002<\/p>\n<p>\u5982\u679c\u8d85\u7c7b\u6ca1\u6709\u9ed8\u8ba4\u6784\u9020\u51fd\u6570\uff0c\u90a3\u4e48\u5b50\u7c7b\u4e5f\u9700\u8981\u5b9a\u4e49\u4e00\u4e2a\u663e\u5f0f\u6784\u9020\u51fd\u6570\u3002\u5426\u5219\u4f1a\u5728\u7f16\u8bd1\u65f6\u629b\u51fa\u5f02\u5e38\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5b50\u7c7b\u6784\u9020\u51fd\u6570\u4e2d\u5bf9\u8d85\u7c7b\u6784\u9020\u51fd\u6570\u7684\u8c03\u7528\u662f\u5f3a\u5236\u7684\uff0c\u5e76\u4e14\u5e94\u8be5\u662f\u5b50\u7c7b\u6784\u9020\u51fd\u6570\u4e2d\u7684\u7b2c\u4e00\u6761\u8bed\u53e5\u3002<\/p>\n<p>Java\u4e0d\u652f\u6301\u591a\u7ee7\u627f\uff0c\u4e00\u4e2a\u5b50\u7c7b\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u7c7b\u3002Animal\u7c7b\u9690\u5f0f\u5730\u7ee7\u627f\u4e86Object\u7c7b\uff0c\u800cCat\u7c7b\u7ee7\u627f\u4e86Animal\u7c7b\uff0c\u4f46\u7531\u4e8eJava\u7ee7\u627f\u7684\u4f20\u9012\u6027\uff0cCat\u7c7b\u4e5f\u7ee7\u627f\u4e86Object\u7c7b\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u5b50\u7c7b\u7684\u5b9e\u4f8b\uff0c\u7136\u540e\u5c06\u5176\u8d4b\u7ed9\u8d85\u7c7b\u53d8\u91cf\uff0c\u8fd9\u88ab\u79f0\u4e3a\u5411\u4e0a\u8f6c\u578b\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u5411\u4e0a\u8f6c\u578b\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre class=\"post-pre\"><code>Cat c = new Cat(); \/\/\u5b50\u7c7b\u5b9e\u4f8b\r\nAnimal a = c; \/\/\u5411\u4e0a\u8f6c\u578b\uff0c\u56e0\u4e3aCat\u4e5f\u662fAnimal\uff0c\u6240\u4ee5\u6ca1\u95ee\u9898<\/code><\/pre>\n<p>\u5f53\u5c06\u8d85\u7c7b\u7684\u5b9e\u4f8b\u8d4b\u7ed9\u5b50\u7c7b\u53d8\u91cf\u65f6\uff0c\u8fd9\u88ab\u79f0\u4e3a\u5411\u4e0b\u8f6c\u578b\u3002\u6211\u4eec\u9700\u8981\u663e\u5f0f\u5c06\u5176\u8f6c\u6362\u4e3a\u5b50\u7c7b\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code>Cat c = new Cat();\r\nAnimal a = c;\r\nCat c1 = (Cat) a; \/\/\u663e\u793a\u8f6c\u578b\uff0c\u7531\u4e8e\"c\"\u5b9e\u9645\u4e0a\u662fCat\u7c7b\u578b\uff0c\u6240\u4ee5\u53ef\u4ee5\u6210\u529f<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\uff0c\u5373\u4f7f\u6211\u4eec\u505a\u9519\u4e86\uff0c\u7f16\u8bd1\u5668\u4e5f\u4e0d\u4f1a\u62b1\u6028\uff0c\u56e0\u4e3a\u6709\u4e86\u663e\u793a\u8f6c\u578b\u3002\u4e0b\u9762\u662f\u4e00\u4e9b\u5728\u8fd0\u884c\u65f6\u4f1a\u629b\u51faClassCastException\uff08\u7c7b\u8f6c\u6362\u5f02\u5e38\uff09\u7684\u60c5\u51b5\u3002<\/p>\n<pre class=\"post-pre\"><code>Dog d = new Dog();\r\nAnimal a = d;\r\nCat c1 = (Cat) a; \/\/\u8fd0\u884c\u65f6\u629b\u51faClassCastException\r\n\r\nAnimal a1 = new Animal();\r\nCat c2 = (Cat) a1; \/\/\u8fd0\u884c\u65f6\u629b\u51faClassCastException\uff0c\u56e0\u4e3aa1\u5b9e\u9645\u4e0a\u662fAnimal\u7c7b\u578b<\/code><\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u5728\u5b50\u7c7b\u4e2d\u91cd\u5199\u8d85\u7c7b\u7684\u65b9\u6cd5\u3002\u7136\u800c\uff0c\u6211\u4eec\u5e94\u8be5\u59cb\u7ec8\u5728\u91cd\u5199\u7684\u65b9\u6cd5\u4e0a\u6ce8\u89e3@Override\u3002\u7f16\u8bd1\u5668\u5c06\u77e5\u9053\u6211\u4eec\u6b63\u5728\u91cd\u5199\u4e00\u4e2a\u65b9\u6cd5\uff0c\u5982\u679c\u8d85\u7c7b\u65b9\u6cd5\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u6211\u4eec\u5c06\u5f97\u5230\u4e00\u4e2a\u7f16\u8bd1\u65f6\u9519\u8bef\uff0c\u800c\u4e0d\u662f\u5728\u8fd0\u884c\u65f6\u5f97\u5230\u4e0d\u60f3\u8981\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528super\u5173\u952e\u5b57\u8c03\u7528\u8d85\u7c7b\u7684\u65b9\u6cd5\u548c\u8bbf\u95ee\u8d85\u7c7b\u7684\u53d8\u91cf\u3002\u5f53\u5b50\u7c7b\u4e2d\u6709\u540c\u540d\u7684\u53d8\u91cf\/\u65b9\u6cd5\u65f6\uff0c\u8fd9\u5f88\u65b9\u4fbf\uff0c\u4f46\u6211\u4eec\u60f3\u8981\u8bbf\u95ee\u8d85\u7c7b\u7684\u53d8\u91cf\/\u65b9\u6cd5\u3002\u5728\u8d85\u7c7b\u548c\u5b50\u7c7b\u4e2d\u5b9a\u4e49\u4e86\u6784\u9020\u51fd\u6570\uff0c\u5e76\u4e14\u6211\u4eec\u9700\u8981\u663e\u5f0f\u8c03\u7528\u8d85\u7c7b\u6784\u9020\u51fd\u6570\u65f6\uff0c\u4e5f\u4f1a\u4f7f\u7528super\u5173\u952e\u5b57\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528instanceof\u6307\u4ee4\u6765\u68c0\u67e5\u5bf9\u8c61\u4e4b\u95f4\u7684\u7ee7\u627f\u5173\u7cfb\uff0c\u8ba9\u6211\u4eec\u901a\u8fc7\u4e0b\u9762\u7684\u4f8b\u5b50\u6765\u7406\u89e3\u3002<\/p>\n<pre class=\"post-pre\"><code>Cat c = new Cat();\r\nDog d = new Dog();\r\nAnimal an = c;\r\n\r\nboolean flag = c instanceof Cat; \/\/\u6b63\u5e38\u60c5\u51b5\uff0c\u8fd4\u56detrue\r\n\r\nflag = c instanceof Animal; \/\/ \u8fd4\u56detrue\uff0c\u56e0\u4e3ac\u4e5f\u662f\u4e00\u4e2aAnimal\r\n\r\nflag = an instanceof Cat; \/\/\u8fd4\u56detrue\uff0c\u56e0\u4e3aa\u5728\u8fd0\u884c\u65f6\u662fCat\u7c7b\u578b\r\n\r\nflag = an instanceof Dog; \/\/\u7531\u4e8e\u660e\u663e\u539f\u56e0\uff0c\u8fd4\u56defalse\u3002\r\n<\/code><\/pre>\n<ol>\n<li>\u6211\u4eec\u4e0d\u80fd\u5728Java\u4e2d\u6269\u5c55\u6700\u7ec8\uff08final\uff09\u7c7b\u3002<\/li>\n<\/ol>\n<p>\u5982\u679c\u4f60\u5728\u4ee3\u7801\u4e2d\u4e0d\u6253\u7b97\u4f7f\u7528\u8d85\u7c7b\uff0c\u5373\u4f60\u7684\u8d85\u7c7b\u53ea\u662f\u7528\u6765\u4fdd\u7559\u53ef\u91cd\u7528\u4ee3\u7801\u7684\u57fa\u7c7b\uff0c\u90a3\u4e48\u4f60\u53ef\u4ee5\u5c06\u5b83\u4eec\u4fdd\u7559\u4e3a\u62bd\u8c61\u7c7b\uff0c\u4ee5\u907f\u514d\u5ba2\u6237\u7c7b\u8fdb\u884c\u4e0d\u5fc5\u8981\u7684\u5b9e\u4f8b\u5316\u3002\u8fd9\u8fd8\u4f1a\u9650\u5236\u57fa\u7c7b\u7684\u5b9e\u4f8b\u521b\u5efa\u3002<\/p>\n<h3>Java\u7ee7\u627f\u89c6\u9891\u6559\u7a0b<\/h3>\n<p>\u6211\u6700\u8fd1\u5728YouTube\u4e0a\u53d1\u5e03\u4e86\u4e24\u4e2a\u89c6\u9891\uff0c\u8be6\u7ec6\u89e3\u91ca\u4e86\u7ee7\u627f\uff0c\u5e76\u63d0\u4f9b\u4e86\u793a\u4f8b\u7a0b\u5e8f\uff0c\u4f60\u5e94\u8be5\u5728\u4e0b\u65b9\u89c2\u770b\u5b83\u4eec\u3002<\/p>\n<p><iframe>\u89c2\u770bYouTube\u89c6\u9891<\/iframe><\/p>\n<p>\u70b9\u51fb<a href=\"https:\/\/www.youtube.com\/watch?v=ljqtixOFQHM\" target=\"_blank\" rel=\"noopener\">\u89c2\u770bYouTube\u89c6\u9891<\/a>\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u4ece\u6211\u4eec\u7684GitHub\u4ed3\u5e93\u4e2d\u67e5\u770b\u66f4\u591a\u7ee7\u627f\u7684\u793a\u4f8b\u3002<\/p>\n<p>\u53c2\u8003\u8d44\u6599\uff1aOracle\u6587\u6863<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u4e2d\u7684\u7ee7\u627f \u5728Java\u4e2d\uff0c\u7ee7\u627f\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u6838\u5fc3\u6982\u5ff5\u4e4b\u4e00\u3002\u5f53\u4e24\u4e2a\u5bf9\u8c61\u4e4b\u95f4\u5b58\u5728&#8221;\u662f\u4e00\u4e2a&#038;#8 [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[183,232,2190,2191,722],"class_list":{"0":"post-833","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-java","10":"tag-2191","11":"tag-722"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java\u7ee7\u627f\u8be6\u89e3\uff1a\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u7684\u7ee7\u627f\u6982\u5ff5\u4e0e\u5b9e\u4f8b\u6559\u7a0b - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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