{"id":55869,"date":"2025-08-14T09:24:52","date_gmt":"2025-08-14T01:24:52","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/55869.html"},"modified":"2025-08-14T09:24:52","modified_gmt":"2025-08-14T01:24:52","slug":"java%e9%9d%a2%e5%90%91%e5%af%b9%e8%b1%a1%e7%ac%ac%e5%9b%9b%e7%ab%a0%e3%80%81%e6%96%b9%e6%b3%95%e9%87%8d%e5%86%99%e4%b8%8e%e5%a4%9a%e6%80%81","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/55869.html","title":{"rendered":"Java\u9762\u5411\u5bf9\u8c61\u7b2c\u56db\u7ae0\u3001\u65b9\u6cd5\u91cd\u5199\u4e0e\u591a\u6001"},"content":{"rendered":"<p id=\"main-toc\">\u76ee\u5f55<\/p>\n<p id=\"-toc\" style=\"margin-left:0px\">\n<p id=\"%E4%B8%80%E3%80%81%E8%AF%BE%E7%A8%8B%E7%9B%AE%E6%A0%87-toc\" style=\"margin-left:40px\">\u4e00\u3001\u8bfe\u7a0b\u76ee\u6807<\/p>\n<p id=\"%E4%BA%8C%E3%80%81%E6%96%B9%E6%B3%95%E9%87%8D%E5%86%99-toc\" style=\"margin-left:40px\">\u4e8c\u3001\u65b9\u6cd5\u91cd\u5199<\/p>\n<p id=\"1.%20%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E5%AD%A6%E4%B9%A0%E6%96%B9%E6%B3%95%E9%87%8D%E5%86%99-toc\" style=\"margin-left:80px\">1. \u4e3a\u4ec0\u4e48\u8981\u5b66\u4e60\u65b9\u6cd5\u91cd\u5199<\/p>\n<p id=\"2.%20%E4%BB%80%E4%B9%88%E6%98%AF%E6%96%B9%E6%B3%95%E9%87%8D%E5%86%99-toc\" style=\"margin-left:80px\">2. \u4ec0\u4e48\u662f\u65b9\u6cd5\u91cd\u5199<\/p>\n<p id=\"3.%20%E6%96%B9%E6%B3%95%E9%87%8D%E5%86%99%E8%A7%84%E5%88%99-toc\" style=\"margin-left:80px\">3. \u65b9\u6cd5\u91cd\u5199\u89c4\u5219<\/p>\n<p id=\"4.%20%E6%96%B9%E6%B3%95%E9%87%8D%E5%86%99vs%E6%96%B9%E6%B3%95%E9%87%8D%E8%BD%BD-toc\" style=\"margin-left:80px\">4. \u65b9\u6cd5\u91cd\u5199vs\u65b9\u6cd5\u91cd\u8f7d<\/p>\n<p id=\"5.%20%E7%BB%83%E4%B9%A0%EF%BC%9A%E4%BD%BF%E7%94%A8%E9%87%8D%E5%86%99%E4%BC%98%E5%8C%96%E7%94%B5%E5%AD%90%E5%AE%A0%E7%89%A9%E7%B3%BB%E7%BB%9F-toc\" style=\"margin-left:80px\">5. \u7ec3\u4e60&#xff1a;\u4f7f\u7528\u91cd\u5199\u4f18\u5316\u7535\u5b50\u5ba0\u7269\u7cfb\u7edf<\/p>\n<p id=\"%E4%B8%89%E3%80%81Object%E7%B1%BB-toc\" style=\"margin-left:40px\">\u4e09\u3001Object\u7c7b<\/p>\n<p id=\"1.%20%E5%9F%BA%E6%9C%AC%E6%A6%82%E5%BF%B5-toc\" style=\"margin-left:80px\">1. \u57fa\u672c\u6982\u5ff5<\/p>\n<p id=\"2.%20Object%E7%B1%BB%E8%A2%AB%E5%AD%90%E7%B1%BB%E7%BB%8F%E5%B8%B8%E9%87%8D%E5%86%99%E7%9A%84%E6%96%B9%E6%B3%95-toc\" style=\"margin-left:80px\">2. 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id=\"5.%20%E7%BB%83%E4%B9%A0%EF%BC%9A%E4%BD%BF%E7%94%A8%E5%A4%9A%E6%80%81%E5%AE%9E%E7%8E%B0%E4%B8%BA%E5%AE%A0%E7%89%A9%E5%96%82%E9%A3%9F-toc\" style=\"margin-left:80px\">5. \u7ec3\u4e60&#xff1a;\u4f7f\u7528\u591a\u6001\u5b9e\u73b0\u4e3a\u5ba0\u7269\u5582\u98df<\/p>\n<p id=\"%E4%BA%94%E3%80%81%E8%BD%AC%E5%9E%8B-toc\" style=\"margin-left:40px\">\u4e94\u3001\u8f6c\u578b<\/p>\n<p id=\"1.%20%E5%90%91%E4%B8%8A%E8%BD%AC%E5%9E%8B-toc\" style=\"margin-left:80px\">1. \u5411\u4e0a\u8f6c\u578b<\/p>\n<p id=\"2.%20%E5%90%91%E4%B8%8B%E8%BD%AC%E5%9E%8B-toc\" style=\"margin-left:80px\">2. \u5411\u4e0b\u8f6c\u578b<\/p>\n<p id=\"%E5%85%AD%E3%80%81instanceof%E8%BF%90%E7%AE%97%E7%AC%A6-toc\" style=\"margin-left:40px\">\u516d\u3001instanceof\u8fd0\u7b97\u7b26<\/p>\n<p id=\"%E7%BB%83%E4%B9%A0%EF%BC%9A%E4%BD%BF%E7%94%A8%E5%A4%9A%E6%80%81%E5%AE%9E%E7%8E%B0%E4%B8%BB%E4%BA%BA%E9%A2%86%E5%85%BB%E5%AE%A0%E7%89%A9%E5%B9%B6%E4%B8%8E%E5%AE%A0%E7%89%A9%E7%8E%A9%E8%80%8D%E5%8A%9F%E8%83%BD-toc\" style=\"margin-left:80px\">\u7ec3\u4e60&#xff1a;\u4f7f\u7528\u591a\u6001\u5b9e\u73b0\u4e3b\u4eba\u9886\u517b\u5ba0\u7269\u5e76\u4e0e\u5ba0\u7269\u73a9\u800d\u529f\u80fd<\/p>\n<p id=\"%E4%B8%83%E3%80%81%E5%A4%9A%E6%80%81%E7%9A%84%E5%BA%94%E7%94%A8-toc\" style=\"margin-left:40px\">\u4e03\u3001\u591a\u6001\u7684\u5e94\u7528<\/p>\n<p id=\"%E7%BB%83%E4%B9%A0%EF%BC%9A%E6%89%93%E5%8D%B0%E5%95%86%E5%93%81%E4%BB%B7%E6%A0%BC-toc\" style=\"margin-left:80px\">\u7ec3\u4e60&#xff1a;\u6253\u5370\u5546\u54c1\u4ef7\u683c<\/p>\n<p id=\"%E5%85%AB%E3%80%81%E6%80%BB%E7%BB%93%E8%A6%81%E7%82%B9-toc\" style=\"margin-left:40px\">\u516b\u3001\u603b\u7ed3\u8981\u70b9<\/p>\n<hr id=\"hr-toc\" \/>\n<h3 id=\"%E4%B8%80%E3%80%81%E8%AF%BE%E7%A8%8B%E7%9B%AE%E6%A0%87\">\u4e00\u3001\u8bfe\u7a0b\u76ee\u6807<\/h3>\n<p>\u5b66\u5b8c\u672c\u6b21\u8bfe\u7a0b\u540e&#xff0c;\u80fd\u591f\u8fbe\u6210\u4ee5\u4e0b\u76ee\u6807&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u5b9e\u73b0\u65b9\u6cd5\u91cd\u5199<\/p>\n<\/li>\n<li>\n<p>\u6df1\u5165\u7406\u89e3\u7ee7\u627f\u76f8\u5173\u6982\u5ff5<\/p>\n<\/li>\n<li>\n<p>\u4e86\u89e3Object\u7c7b<\/p>\n<\/li>\n<li>\n<p>\u4f1a\u4f7f\u7528\u91cd\u5199\u5b9e\u73b0\u591a\u6001\u673a\u5236<\/p>\n<\/li>\n<li>\n<p>\u4f1a\u4f7f\u7528instanceof\u8fd0\u7b97\u7b26<\/p>\n<\/li>\n<li>\n<p>\u4f1a\u4f7f\u7528\u5411\u4e0a\u8f6c\u578b<\/p>\n<\/li>\n<li>\n<p>\u4f1a\u4f7f\u7528\u5411\u4e0b\u8f6c\u578b<\/p>\n<\/li>\n<\/ul>\n<h3 id=\"%E4%BA%8C%E3%80%81%E6%96%B9%E6%B3%95%E9%87%8D%E5%86%99\">\u4e8c\u3001\u65b9\u6cd5\u91cd\u5199<\/h3>\n<h4 id=\"1.%20%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E5%AD%A6%E4%B9%A0%E6%96%B9%E6%B3%95%E9%87%8D%E5%86%99\">1. 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id=\"4.%20%E6%96%B9%E6%B3%95%E9%87%8D%E5%86%99vs%E6%96%B9%E6%B3%95%E9%87%8D%E8%BD%BD\">4. \u65b9\u6cd5\u91cd\u5199vs\u65b9\u6cd5\u91cd\u8f7d<\/h4>\n<table>\n<tr>\u6bd4\u8f83\u9879\u4f4d\u7f6e\u65b9\u6cd5\u540d\u53c2\u6570\u8868\u8fd4\u56de\u503c\u8bbf\u95ee\u4fee\u9970\u7b26<\/tr>\n<tbody>\n<tr>\n<td>\u65b9\u6cd5\u91cd\u5199<\/td>\n<td>\u5b50\u7c7b<\/td>\n<td>\u76f8\u540c<\/td>\n<td>\u76f8\u540c<\/td>\n<td>\u76f8\u540c\u6216\u662f\u5176\u5b50\u7c7b<\/td>\n<td>\u4e0d\u80fd\u6bd4\u7236\u7c7b\u66f4\u4e25\u683c<\/td>\n<\/tr>\n<tr>\n<td>\u65b9\u6cd5\u91cd\u8f7d<\/td>\n<td>\u540c\u7c7b<\/td>\n<td>\u76f8\u540c<\/td>\n<td>\u4e0d\u76f8\u540c<\/td>\n<td>\u65e0\u5173<\/td>\n<td>\u65e0\u5173<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4 id=\"5.%20%E7%BB%83%E4%B9%A0%EF%BC%9A%E4%BD%BF%E7%94%A8%E9%87%8D%E5%86%99%E4%BC%98%E5%8C%96%E7%94%B5%E5%AD%90%E5%AE%A0%E7%89%A9%E7%B3%BB%E7%BB%9F\">5. 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id=\"1.%20%E5%9F%BA%E6%9C%AC%E6%A6%82%E5%BF%B5\">1. \u57fa\u672c\u6982\u5ff5<\/h4>\n<p>Object\u7c7b\u662f\u6240\u6709\u7c7b\u7684\u7236\u7c7b&#xff0c;\u4efb\u4f55\u7c7b\u90fd\u9ed8\u8ba4\u7ee7\u627fObject\u7c7b&#xff0c;\u5982public class Pet extends Object {\u2026\u2026} \u3002<\/p>\n<h4 id=\"2.%20Object%E7%B1%BB%E8%A2%AB%E5%AD%90%E7%B1%BB%E7%BB%8F%E5%B8%B8%E9%87%8D%E5%86%99%E7%9A%84%E6%96%B9%E6%B3%95\">2. Object\u7c7b\u88ab\u5b50\u7c7b\u7ecf\u5e38\u91cd\u5199\u7684\u65b9\u6cd5<\/h4>\n<table>\n<tr>\u65b9\u6cd5\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>toString()<\/td>\n<td>\u8fd4\u56de\u5f53\u524d\u5bf9\u8c61\u672c\u8eab\u7684\u6709\u5173\u4fe1\u606f&#xff0c;\u6309\u5b57\u7b26\u4e32\u5bf9\u8c61\u8fd4\u56de<\/td>\n<\/tr>\n<tr>\n<td>equals()<\/td>\n<td>\u6bd4\u8f83\u4e24\u4e2a\u5bf9\u8c61\u662f\u5426\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61&#xff0c;\u662f\u5219\u8fd4\u56detrue<\/td>\n<\/tr>\n<tr>\n<td>hashCode()<\/td>\n<td>\u8fd4\u56de\u8be5\u5bf9\u8c61\u7684\u54c8\u5e0c\u4ee3\u7801\u503c<\/td>\n<\/tr>\n<tr>\n<td>getClass()<\/td>\n<td>\u83b7\u53d6\u5f53\u524d\u5bf9\u8c61\u6240\u5c5e\u7684\u7c7b\u4fe1\u606f&#xff0c;\u8fd4\u56deClass\u5bf9\u8c61<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4 id=\"3.%20Object%E7%B1%BB%E7%9A%84equals()%E6%96%B9%E6%B3%95\">3. Object\u7c7b\u7684equals()\u65b9\u6cd5<\/h4>\n<ul>\n<li>\n<p>\u6bd4\u8f83\u4e24\u4e2a\u5bf9\u8c61\u662f\u5426\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61&#xff0c;\u662f\u5219\u8fd4\u56detrue\u3002<\/p>\n<\/li>\n<li>\n<p>\u4e0e\u64cd\u4f5c\u7b26&#061;&#061;\u7684\u533a\u522b&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u7b80\u5355\u6570\u636e\u7c7b\u578b&#xff0c;&#061;&#061;\u76f4\u63a5\u6bd4\u8f83\u503c&#xff0c;\u59821&#061;&#061;2\u3002<\/p>\n<\/li>\n<li>\n<p>\u5f15\u7528\u7c7b\u578b&#xff0c;&#061;&#061;\u6bd4\u8f83\u4e24\u8005\u662f\u5426\u4e3a\u540c\u4e00\u5bf9\u8c61\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u76f8\u5173\u8bf4\u660e&#xff1a; &#xff08;1&#xff09;Object\u7c7b\u7684equals()\u65b9\u6cd5\u4e0e&#061;&#061;\u6ca1\u533a\u522b\u3002 &#xff08;2&#xff09;\u5f53\u6709\u7279\u6b8a\u9700\u6c42&#xff0c;\u5982\u8ba4\u4e3a\u5c5e\u6027\u76f8\u540c\u5373\u4e3a\u540c\u4e00\u5bf9\u8c61\u65f6&#xff0c;\u9700\u8981\u91cd\u5199equals()\u3002 &#xff08;3&#xff09;Java.lang.String\u91cd\u5199\u4e86equals()\u65b9\u6cd5&#xff0c;\u628aequals()\u65b9\u6cd5\u7684\u5224\u65ad\u53d8\u4e3a\u4e86\u5224\u65ad\u5176\u503c\u3002<\/p>\n<\/li>\n<\/ul>\n<h4 id=\"4.%20%E7%BB%83%E4%B9%A0%EF%BC%9A%E9%87%8D%E5%86%99equals()\">4. \u7ec3\u4e60&#xff1a;\u91cd\u5199equals()<\/h4>\n<p>\u9700\u6c42\u8bf4\u660e&#xff1a;\u91cd\u5199\u6bd4\u8f83\u89c4\u5219&#xff0c;\u5224\u65ad\u4e24\u540d\u5b66\u5458&#xff08;Student&#xff09;\u662f\u5426\u4e3a\u540c\u4e00\u5bf9\u8c61\u3002Student\u76f8\u5173\u5c5e\u6027\u6709Id&#xff08;\u5b66\u53f7&#xff09;\u3001name&#xff08;\u59d3\u540d&#xff09;\u3001age&#xff08;\u5e74\u9f84&#xff09;&#xff0c;\u5982\u679c\u4e24\u540d\u5b66\u5458\u7684\u5b66\u53f7\u4ee5\u53ca\u59d3\u540d\u76f8\u540c&#xff0c;\u5219\u4e3a\u540c\u4e00\u5bf9\u8c61\u3002<\/p>\n<h3 id=\"%E5%9B%9B%E3%80%81%E5%A4%9A%E6%80%81\">\u56db\u3001\u591a\u6001<\/h3>\n<h4 id=\"1.%20%E4%B8%BA%E4%BB%80%E4%B9%88%E4%BD%BF%E7%94%A8%E5%A4%9A%E6%80%81\">1. \u4e3a\u4ec0\u4e48\u4f7f\u7528\u591a\u6001<\/h4>\n<p>\u5728\u4e4b\u524d\u7684\u7535\u5b50\u5ba0\u7269\u7cfb\u7edf\u4e2d&#xff0c;\u4e3b\u4eba\u7c7b\u7ed9\u4e0d\u540c\u5ba0\u7269\u770b\u75c5\u9700\u8981\u7f16\u5199\u4e0d\u540c\u7684\u65b9\u6cd5&#xff0c;\u5982\u7ed9\u4f01\u9e45\u770b\u75c5\u3001\u7ed9\u72d7\u770b\u75c5\u3002\u5f53\u9700\u8981\u7ed9\u65b0\u7684\u5ba0\u7269\u770b\u75c5\u65f6&#xff0c;\u9700\u8981\u9891\u7e41\u4fee\u6539\u4ee3\u7801&#xff0c;\u6dfb\u52a0\u65b0\u7684\u7c7b\u548c\u65b9\u6cd5&#xff0c;\u5bfc\u81f4\u4ee3\u7801\u53ef\u6269\u5c55\u6027\u3001\u53ef\u7ef4\u62a4\u6027\u5dee\u3002\u800c\u591a\u6001\u53ef\u4ee5\u89e3\u51b3\u8fd9\u4e00\u95ee\u9898\u3002<\/p>\n<h4 id=\"2.%20%E4%BB%80%E4%B9%88%E6%98%AF%E5%A4%9A%E6%80%81\">2. \u4ec0\u4e48\u662f\u591a\u6001<\/h4>\n<p>\u591a\u6001\u6307\u540c\u4e00\u4e2a\u5f15\u7528\u7c7b\u578b&#xff0c;\u4f7f\u7528\u4e0d\u540c\u7684\u5b9e\u4f8b\u800c\u6267\u884c\u4e0d\u540c\u64cd\u4f5c&#xff0c;\u5373\u540c\u4e00\u79cd\u4e8b\u7269&#xff0c;\u7531\u4e8e\u6761\u4ef6\u4e0d\u540c&#xff0c;\u4ea7\u751f\u7684\u7ed3\u679c\u4e5f\u4e0d\u540c\u3002\u6bd4\u5982\u4e0d\u540c\u7c7b\u578b\u7684\u6253\u5370\u673a\u6253\u5370\u6548\u679c\u4e0d\u540c\u3002<\/p>\n<h4 id=\"3.%20%E5%A4%9A%E6%80%81%E7%9A%84%E4%BD%BF%E7%94%A8\">3. \u591a\u6001\u7684\u4f7f\u7528<\/h4>\n<ul>\n<li>\n<p>\u4f7f\u7528\u591a\u6001\u4f18\u5316\u540e\u7684\u4ee3\u7801\u793a\u4f8b&#xff1a;<\/p>\n<p> \/\/Dog\u7c7b<br \/>\npublic class Dog extends Pet {<br \/>\n \u00a0 \u00a0public void toHospital() {<br \/>\n \u00a0 \u00a0 \u00a0 \u00a0this.setHealth(60);<br \/>\n \u00a0 \u00a0 \u00a0 \u00a0System.out.println(&#034;\u6253\u9488\u3001\u5403\u836f&#034;);<br \/>\n \u00a0  }<br \/>\n}<br \/>\n\u200b<br \/>\n\/\/Penguin\u7c7b<br \/>\npublic class Penguin extends Pet {<br \/>\n \u00a0 \u00a0public void toHospital() {<br \/>\n \u00a0 \u00a0 \u00a0 \u00a0this.setHealth(70);<br \/>\n \u00a0 \u00a0 \u00a0 \u00a0System.out.println(&#034;\u5403\u836f\u3001\u7597\u517b&#034;);<br \/>\n \u00a0  }<br \/>\n}<br \/>\n\u200b<br \/>\n\/\/\u4e3b\u4eba\u7c7b<br \/>\npublic class Master {<br \/>\n \u00a0 \u00a0public void cure(Pet pet) {<br \/>\n \u00a0 \u00a0 \u00a0 \u00a0if (pet.getHealth() &lt; 50)<br \/>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0pet.toHospital(); \u00a0 \u00a0 \u00a0 \u00a0<br \/>\n \u00a0  }<br \/>\n}<br \/>\n\u200b<br \/>\n\/\/\u6d4b\u8bd5\u65b9\u6cd5<br \/>\nPet pet &#061; new Dog();<br \/>\nMaster master &#061; new Master();<br \/>\nmaster.cure(pet); <\/p>\n<\/li>\n<li>\n<p>\u5f53\u53c8\u8981\u7ed9\u65b0\u7684\u5ba0\u7269\u770b\u75c5\u65f6&#xff0c;\u53ea\u9700\u7f16\u5199\u65b0\u7684\u7c7b\u7ee7\u627fPet\u7c7b\u5e76\u521b\u5efa\u5bf9\u8c61&#xff0c;\u5176\u4ed6\u4ee3\u7801\u65e0\u9700\u4fee\u6539&#xff08;\u4e0d\u7528\u4fee\u6539Master\u7c7b&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p>\u65b9\u6cd5\u91cd\u5199\u662f\u5b9e\u73b0\u591a\u6001\u7684\u57fa\u7840\u3002<\/p>\n<\/li>\n<\/ul>\n<h4 id=\"4.%20%E6%8A%BD%E8%B1%A1%E7%B1%BB%E4%B8%8E%E6%8A%BD%E8%B1%A1%E6%96%B9%E6%B3%95\">4. \u62bd\u8c61\u7c7b\u4e0e\u62bd\u8c61\u65b9\u6cd5<\/h4>\n<ul>\n<li>\n<p>\u95ee\u9898&#xff1a;Pet\u7c7b\u7684toHospital()\u4e0d\u9700\u8981\u6709\u5177\u4f53\u7684\u5b9e\u73b0&#xff0c;\u5b9e\u4f8b\u5316Pet\u6beb\u65e0\u610f\u4e49\u3002<\/p>\n<\/li>\n<li>\n<p>\u62bd\u8c61\u65b9\u6cd5&#xff1a;\u6ca1\u6709\u65b9\u6cd5\u4f53&#xff0c;\u5fc5\u987b\u5728\u62bd\u8c61\u7c7b\u91cc&#xff0c;\u4e14\u5fc5\u987b\u5728\u5b50\u7c7b\u4e2d\u88ab\u5b9e\u73b0&#xff0c;\u9664\u975e\u5b50\u7c7b\u662f\u62bd\u8c61\u7c7b&#xff0c;\u5982public abstract void print();\u3002<\/p>\n<\/li>\n<li>\n<p>\u62bd\u8c61\u7c7b&#xff1a;\u5305\u542b\u62bd\u8c61\u65b9\u6cd5\u7684\u7c7b&#xff0c;\u58f0\u660e\u4e3apublic abstract class Pet {\u2026\u2026} \u3002<\/p>\n<\/li>\n<\/ul>\n<h4 id=\"5.%20%E7%BB%83%E4%B9%A0%EF%BC%9A%E4%BD%BF%E7%94%A8%E5%A4%9A%E6%80%81%E5%AE%9E%E7%8E%B0%E4%B8%BA%E5%AE%A0%E7%89%A9%E5%96%82%E9%A3%9F\">5. \u7ec3\u4e60&#xff1a;\u4f7f\u7528\u591a\u6001\u5b9e\u73b0\u4e3a\u5ba0\u7269\u5582\u98df<\/h4>\n<p>\u9700\u6c42\u8bf4\u660e&#xff1a;\u5ba0\u7269\u997f\u4e86&#xff0c;\u4e3b\u4eba\u9700\u8981\u4e3a\u5ba0\u7269\u5582\u98df&#xff0c;\u4f7f\u7528\u591a\u6001\u5b9e\u73b0\u8be5\u8fc7\u7a0b\u3002\u4e0d\u540c\u5ba0\u7269\u5403\u7684\u4e1c\u897f\u4e0d\u4e00\u6837&#xff0c;\u5403\u5b8c\u4e1c\u897f\u540e\u6062\u590d\u5065\u5eb7\u503c\u4e5f\u4e0d\u4e00\u6837&#xff0c;\u72d7\u72d7\u5065\u5eb7\u503c\u589e\u52a03&#xff0c;\u4f01\u9e45\u5065\u5eb7\u503c\u589e\u52a05&#xff0c;\u4e14\u5065\u5eb7\u503c\u8fbe\u5230100\u65f6&#xff0c;\u4e0d\u9700\u8981\u7ee7\u7eed\u5582\u98df\u3002<\/p>\n<h3 id=\"%E4%BA%94%E3%80%81%E8%BD%AC%E5%9E%8B\">\u4e94\u3001\u8f6c\u578b<\/h3>\n<h4 id=\"1.%20%E5%90%91%E4%B8%8A%E8%BD%AC%E5%9E%8B\">1. \u5411\u4e0a\u8f6c\u578b<\/h4>\n<ul>\n<li>\n<p>\u6982\u5ff5&#xff1a;\u7236\u7c7b\u7684\u5f15\u7528\u6307\u5411\u5b50\u7c7b\u5bf9\u8c61&#xff0c;\u81ea\u52a8\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362&#xff0c;\u683c\u5f0f\u4e3a&lt;\u7236\u7c7b\u578b&gt; &lt;\u5f15\u7528\u53d8\u91cf\u540d&gt; &#061; new &lt;\u5b50\u7c7b\u578b&gt;();\u3002<\/p>\n<\/li>\n<li>\n<p>\u6ce8\u610f&#xff1a;\u6b64\u65f6\u901a\u8fc7\u7236\u7c7b\u5f15\u7528\u53d8\u91cf\u8c03\u7528\u7684\u65b9\u6cd5\u662f\u5b50\u7c7b\u8986\u76d6\u6216\u7ee7\u627f\u7236\u7c7b\u7684\u65b9\u6cd5&#xff0c;\u4e0d\u662f\u7236\u7c7b\u7684\u65b9\u6cd5&#xff0c;\u4e14\u65e0\u6cd5\u8c03\u7528\u5b50\u7c7b\u7279\u6709\u7684\u65b9\u6cd5\u3002<\/p>\n<\/li>\n<li>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p> \/\/\u6d4b\u8bd5\u65b9\u6cd5<br \/>\nPet pet &#061; new Dog();<br \/>\npet.setHealth(20);<br \/>\nMaster master &#061; new Master();<br \/>\nmaster.cure(pet); <\/p>\n<\/li>\n<\/ul>\n<h4 id=\"2.%20%E5%90%91%E4%B8%8B%E8%BD%AC%E5%9E%8B\">2. \u5411\u4e0b\u8f6c\u578b<\/h4>\n<ul>\n<li>\n<p>\u6982\u5ff5&#xff1a;\u5c06\u4e00\u4e2a\u6307\u5411\u5b50\u7c7b\u5bf9\u8c61\u7684\u7236\u7c7b\u5f15\u7528\u8d4b\u7ed9\u4e00\u4e2a\u5b50\u7c7b\u7684\u5f15\u7528&#xff0c;\u5373\u7236\u7c7b\u7c7b\u578b\u8f6c\u6362\u4e3a\u5b50\u7c7b\u7c7b\u578b&#xff0c;\u9700\u8981\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362&#xff0c;\u683c\u5f0f\u4e3a&lt;\u5b50\u7c7b\u578b&gt; &lt;\u5f15\u7528\u53d8\u91cf\u540d&gt; &#061; (&lt;\u5b50\u7c7b\u578b&gt; )&lt;\u7236\u7c7b\u578b\u7684\u5f15\u7528\u53d8\u91cf&gt;;\u3002<\/p>\n<\/li>\n<li>\n<p>\u6ce8\u610f&#xff1a;\u5728\u5411\u4e0b\u8f6c\u578b\u7684\u8fc7\u7a0b\u4e2d&#xff0c;\u5982\u679c\u6ca1\u6709\u8f6c\u6362\u4e3a\u771f\u5b9e\u5b50\u7c7b\u7c7b\u578b&#xff0c;\u4f1a\u51fa\u73b0\u7c7b\u578b\u8f6c\u6362\u5f02\u5e38\u3002<\/p>\n<\/li>\n<li>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p> Dog dog&#061;(Dog)pet;\/\/\u5c06pet \u8f6c\u6362\u4e3aDog\u7c7b\u578b<br \/>\ndog.catchingFlyDisc();\/\/\u6267\u884cDog\u7279\u6709\u7684\u65b9\u6cd5 <\/p>\n<\/li>\n<\/ul>\n<h3 id=\"%E5%85%AD%E3%80%81instanceof%E8%BF%90%E7%AE%97%E7%AC%A6\">\u516d\u3001instanceof\u8fd0\u7b97\u7b26<\/h3>\n<ul>\n<li>\n<p>\u4f5c\u7528&#xff1a;\u7528\u4e8e\u5224\u65ad\u4e00\u4e2a\u5f15\u7528\u7c7b\u578b\u6240\u5f15\u7528\u7684\u5bf9\u8c61\u662f\u5426\u662f\u4e00\u4e2a\u7c7b\u7684\u5b9e\u4f8b\u3002<\/p>\n<\/li>\n<li>\n<p>\u6ce8\u610f&#xff1a;\u4f7f\u7528instanceof\u65f6&#xff0c;\u5bf9\u8c61\u7684\u7c7b\u578b\u5fc5\u987b\u548cinstanceof\u540e\u9762\u7684\u53c2\u6570\u6240\u6307\u5b9a\u7684\u7c7b\u5728\u7ee7\u627f\u4e0a\u6709\u4e0a\u4e0b\u7ea7\u5173\u7cfb\u3002<\/p>\n<\/li>\n<li>\n<p>\u5e94\u7528&#xff1a;\u53ef\u4ee5\u51cf\u5c11\u5728\u5411\u4e0b\u8f6c\u578b\u8fc7\u7a0b\u4e2d\u56e0\u6ca1\u6709\u8f6c\u6362\u4e3a\u771f\u5b9e\u5b50\u7c7b\u7c7b\u578b\u800c\u51fa\u73b0\u7684\u7c7b\u578b\u8f6c\u6362\u5f02\u5e38\u3002<\/p>\n<\/li>\n<\/ul>\n<h4 id=\"%E7%BB%83%E4%B9%A0%EF%BC%9A%E4%BD%BF%E7%94%A8%E5%A4%9A%E6%80%81%E5%AE%9E%E7%8E%B0%E4%B8%BB%E4%BA%BA%E9%A2%86%E5%85%BB%E5%AE%A0%E7%89%A9%E5%B9%B6%E4%B8%8E%E5%AE%A0%E7%89%A9%E7%8E%A9%E8%80%8D%E5%8A%9F%E8%83%BD\">\u7ec3\u4e60&#xff1a;\u4f7f\u7528\u591a\u6001\u5b9e\u73b0\u4e3b\u4eba\u9886\u517b\u5ba0\u7269\u5e76\u4e0e\u5ba0\u7269\u73a9\u800d\u529f\u80fd<\/h4>\n<p>\u9700\u6c42\u8bf4\u660e&#xff1a;\u72d7\u5177\u6709\u7279\u6709\u7684\u63a5\u98de\u76d8\u65b9\u6cd5&#xff0c;\u4f01\u9e45\u5177\u6709\u7279\u6709\u7684\u5357\u6781\u6e38\u6cf3\u65b9\u6cd5\u3002\u7f16\u5199\u6d4b\u8bd5\u7c7b\u5206\u522b\u8c03\u7528\u5404\u79cd\u5177\u4f53\u5ba0\u7269\u7684\u7279\u6709\u65b9\u6cd5&#xff0c;\u8981\u6c42\u4f7f\u7528\u5411\u4e0b\u8f6c\u578b\u548cinstanceof\u5224\u65ad\u5ba0\u7269\u7c7b\u578b\u3002<\/p>\n<h3 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