{"id":559,"date":"2024-11-08T15:05:38","date_gmt":"2024-11-08T07:05:38","guid":{"rendered":"https:\/\/eve2333.top\/?p=559"},"modified":"2024-11-08T15:31:56","modified_gmt":"2024-11-08T07:31:56","slug":"cs61b%e5%ad%a6%e4%b9%a0-part5","status":"publish","type":"post","link":"https:\/\/eve2333.top\/?p=559","title":{"rendered":"CS61b\u5b66\u4e60-part5"},"content":{"rendered":"\n

8.1 The Desire for Generality<\/h1>\n\n\n\n

\u4eca\u5929\u6211\u4eec\u5c06\u4f1a\u8ba8\u8bba\u4e00\u4e2a\u5168\u65b0\u7684\u4e3b\u9898\uff0c\u79f0\u4e3a\u7ee7\u627f\u3002\u4e3a\u4e86\u94fa\u57ab\uff0c\u8ba9\u6211\u4eec\u8003\u8651\u5728\u8fc7\u53bb\u51e0\u8282\u8bfe\u4e2d\u6784\u5efa\u7684`SList`\u7c7b\u548c`AList`\u7c7b\u3002\u6211\u4eec\u770b\u5230\u5b83\u4eec\u5b9e\u9645\u4e0a\u5177\u6709\u5b8c\u5168\u76f8\u540c\u7684\u64cd\u4f5c\uff0c\u5b83\u4eec\u90fd\u5141\u8bb8\u6211\u4eec\u6dfb\u52a0\u5143\u7d20\u3001\u83b7\u53d6\u5143\u7d20\u3001\u79fb\u9664\u5143\u7d20\u4ee5\u53ca\u83b7\u53d6\u5927\u5c0f\uff0c\u5982\u679c\u4f60\u5b8c\u6210\u4e86\u7f51\u7ad9\u4e0a\u63d0\u4f9b\u7684\u8ba8\u8bba\u5de5\u4f5c\u8868\uff0c\u6216\u8005\u5982\u679c\u4f60\u5728\u4f2f\u514b\u5229\u4e0a\u8bfe\uff0c\u90a3\u4e48\u6211\u4eec\u8fd8\u6dfb\u52a0\u4e86\u8fd9\u4e2a\u63d2\u5165\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5728\u4efb\u610f\u4f4d\u7f6e\u63d2\u5165\u5143\u7d20\u3002\u597d\u4e86\uff0c\u9274\u4e8e\u8fd9\u4e9b\u7c7b\uff0c\u6211\u4eec\u73b0\u5728\u60f3\u8981\u5c1d\u8bd5\u5b9e\u9645\u4f7f\u7528\u5b83\u4eec\u6765\u505a\u70b9\u4e8b\u60c5\uff0c\u90a3\u4e48\u6211\u4eec\u53ef\u80fd\u60f3\u505a\u4ec0\u4e48\u5462\uff1f\u8ba9\u6211\u4eec\u5236\u9020\u4e00\u4e2a\u5c0f\u5c0f\u7684\u5047\u60f3\u95ee\u9898\uff0c\u90a3\u5c31\u662f\u6211\u4eec\u60f3\u8981\u6784\u5efa\u4e00\u4e2a\u5e93\u6765\u5e2e\u52a9\u5176\u4ed6\u4eba\u5904\u7406\u5355\u8bcd\u5217\u8868\uff0c\u4e5f\u8bb8\u6211\u4eec\u60f3\u8981\u7f16\u5199\u4e00\u4e2a\u65b9\u6cd5\uff0c\u5b83\u63a5\u53d7\u4e00\u4e2a\u5355\u8bcd\u5217\u8868\uff0c\u627e\u5230\u6700\u957f\u7684\u5355\u8bcd\u5e76\u8fd4\u56de\u5b83\u3002<\/p>\n\n\n\n

Suppose we're writing a library to manipulate lists of words. Might want to write a function that finds the longest word from a list of<\/p>\n\n\n\n

public static String longest(SLList<String> list){ \n    int maxDex =0;\n    for (int i<0; i<list.size(); i + 1){\n        String longestString=list.get(maxDex); \n        String thisString = list.get(i);\n        if (thisString. length() longestString.length()){ \n            maxDex =i;\n        }\n    }\n\n    return list.get(maxDex);\n}\n\nNote: This code is very inefficient! <\/code><\/pre>\n\n\n\n
\u73b0\u5728\u8fd9\u6bb5\u4ee3\u7801\u5b9e\u9645\u4e0a\u5e76\u4e0d\u91cd\u8981\uff0c\u5b83\u8bf4\u4e86\u4ec0\u4e48\u4e0d\u7528\u62c5\u5fc3\u9605\u8bfb\u8fd9\u91cc\u7684\u5b9e\u73b0\uff0c\u53ea\u8981\u76f8\u4fe1\u5b83\u80fd\u5de5\u4f5c\u5c31\u884c\u3002\u5f53\u6211\u4eec\u67e5\u770b\u8fd9\u6bb5\u4ee3\u7801\u5e76\u5c1d\u8bd5\u8fd0\u884c\u5b83\u65f6\uff0c\u8fd9\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u6d4b\u8bd5\u4e86\u8fd9\u4e2a\u5e93\u7684\u529f\u80fd\uff0c\u6240\u4ee5\u6211\u521b\u5efa\u4e86\u4e00\u4e2a`SList`\uff0c\u653e\u5165\u4e86\u5355\u8bcd\u201celk\u201d\u3001\u201care\u201d\u3001\u201cwatching\u201d\uff0c\u7136\u540e\u6211\u8bf7\u6c42\u6700\u957f\u7684\u5355\u8bcd\uff0c\u70b9\u51fb\u8fd0\u884c\uff0c\u6216\u8005\u201cdeer\u201d\u3001\u201ctilts\u201d\uff0c\u7136\u540e\u6211\u5f97\u5230\u4e86\u201cwatching\u201d\uff0c\u56e0\u4e3a\u5b83\u662f\u6700\u957f\u7684\u5355\u8bcd\u3002\u4e0b\u9762\u662fWordUtils.java<\/p>\n\n\n\n
public class WordUtils {\n    \/** Returns the length of the longest word. *\/\n    public static String longest(SLList<String> list){\/\/\u8fd9\u91cc\u7684SLList\u6539\u6210AList\n        int maxDex = 0\uff1b\n        for (int i= 0\uff1b i < list.size(); i +=1){\n            String longestString = list.get(maxDex);\n            String thisString = list.get(i);\n            if(thisstring.length()> longestString.length()){\n                maxDex = i;\n            }\n        }\n        return list.get(maxDex);\n    }\n\n    public static void main(String[] args){\n        SLList<String> someList = new SLList<>();\n      \/\/AList <String> someList = new AList<>()\n        someList.addLast(\"elk\");\n        someList.addLast(\"are\");\n        someList.addLast(\"watching\");\n        System.out.println(longest(someList);\/\/\u5982\u679c\u662fAList\u5c31\u4f1aerror\n        \/\/someList.print();\n    }\n}<\/code><\/pre>\n\n\n\n
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\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u4e0d\u9700\u8981\u505a\u592a\u591a\u6539\u53d8\uff0c\u7279\u522b\u5730\uff0c\u6211\u4eec\u53ea\u9700\u5c06`SL`\u6539\u4e3a`A`\uff0c\u6362\u53e5\u8bdd\u8bf4\uff0c\u6211\u8fd9\u6837\u505a\u540e\uff0c\u73b0\u5728\u4e00\u5207\u90fd\u4f1a\u6b63\u5e38\u5de5\u4f5c\u3002\u6240\u4ee5\u540c\u6837\u7684\u9053\u7406\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u4e00\u5207\u90fd\u5f88\u597d\u3002\u5f53\u7136\uff0c\u5982\u679c\u6709\u4eba\u8bd5\u56fe\u4f7f\u7528\u6211\u4eec\u7684\u5e93\uff0c\u5374\u4e0d\u5f97\u4e0d\u4e0d\u65ad\u7f16\u8f91`AList`\u548c`SList`\uff0c\u8fd9\u4f1a\u8ba9\u4eba\u611f\u5230\u538c\u70e6\uff0c\u6240\u4ee5\u53e6\u4e00\u4e2a\u89e3\u51b3\u65b9\u6848\u5b9e\u9645\u4e0a\u662f\u76f4\u63a5\u590d\u5236\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u8ba9\u8fd9\u4e2a\u7248\u672c\u57fa\u4e8e`AList`\uff0c\u8fd9\u4e2a\u7248\u672c\u57fa\u4e8e`SList`\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5373\u4f7f\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u540c\u540d\u4e5f\u6ca1\u5173\u7cfb\uff0c\u8fd9\u6bb5\u4ee3\u7801\u4ecd\u7136\u53ef\u4ee5\u987a\u5229\u7f16\u8bd1\u548c\u8fd0\u884c\uff0c\u56e0\u4e3a\u8fd9\u662f\u4f60\u5728Java\u4e2d\u53ef\u4ee5\u505a\u7684\u4e8b\u60c5\u3002\u6240\u4ee5\u8fd9\u4e2a\u62e5\u6709\u591a\u540c\u540d\u4f46\u53c2\u6570\u4e0d\u540c\u6216\u7b7e\u540d\u4e0d\u540c\u7684\u65b9\u6cd5\u7684\u60f3\u6cd5\u662f\u53ef\u4ee5\u7684\uff0cJava\u4f1a\u5728\u7f16\u8bd1\u65f6\u81ea\u52a8\u786e\u5b9a\u8c03\u7528\u54ea\u4e2a\u65b9\u6cd5\uff0c\u5b83\u4f1a\u77e5\u9053\u8fd0\u884c\u54ea\u4e2a\u65b9\u6cd5\uff0c\u6240\u4ee5\u8fd9\u53ea\u662f\u4e00\u4e2a\u91cd\u8f7d\u7684\u6982\u5ff5\u3002\u73b0\u5728\u867d\u7136\u6280\u672f\u4e0a\u53ef\u884c\uff0c\u4f46\u8fd9\u5e76\u4e0d\u662f\u4e00\u4e2a\u597d\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u867d\u7136\u5b83\u53ef\u4ee5\u8ba9\u6211\u4eec\u5728\u4efb\u4e00\u60c5\u51b5\u4e0b\u8fd0\u884c\u4ee3\u7801\uff0c\u4f46\u6211\u8ba4\u4e3a\u8fd9\u5f88\u7cdf\u7cd5\uff0c\u6240\u4ee5\u5e0c\u671b\u4f60\u80fd\u601d\u8003\u4e00\u4e0b\u4e3a\u4ec0\u4e48\u5b83\u4e0d\u597d\uff0c\u4e5f\u8bb8\u5217\u51fa\u4e00\u4e2a\u7b80\u77ed\u7684\u6e05\u5355\uff0c\u6211\u4f1a\u7528\u6211\u7684\u6e05\u5355\u6765\u5267\u900f\u4e00\u4e0b\uff0c\u6240\u4ee5\u6211\u8ba8\u538c\u7684\u4e00\u4e9b\u4e8b\u60c5\u662f\uff0c\u9996\u5148\u6211\u4eec\u7684\u6e90\u4ee3\u7801\u6587\u4ef6\u5f53\u7136\u6ca1\u6709\u5fc5\u8981\u90a3\u4e48\u957f\uff0c\u4f60\u67e5\u770b\u5b83\u4eec\u65f6\uff0c\u4f1a\u53d1\u73b0\u5f88\u591a\u989d\u5916\u7684\u4e1c\u897f\uff0c\u8fd9\u53ef\u80fd\u4e0d\u662f\u4ec0\u4e48\u5927\u4e8b\uff0c\u4f46\u5b83\u4f1a\u663e\u5f97\u6742\u4e71\u3002\u53e6\u4e00\u4e2a\u662f\uff0c\u91cd\u590d\u81ea\u5df1\u5728\u7f8e\u5b66\u4e0a\u975e\u5e38\u7cdf\u7cd5\uff0c\u4e0d\u4ec5\u4ec5\u662f\u4ee3\u7801\u5f88\u957f\uff0c\u800c\u4e14\u975e\u5e38\u76f8\u4f3c\uff0c\u6ca1\u6709\u4eba\u613f\u610f\u8fd9\u6837\u505a\uff0c\u8fd9\u611f\u89c9\u4e0d\u5bf9\u3002\u53e6\u4e00\u4e2a\u662f\uff0c\u6709\u66f4\u591a\u7684\u4ee3\u7801\u9700\u8981\u7ef4\u62a4\u3002\u8fd9\u662f\u4e00\u4e2a\u6709\u8da3\u7684\u89c2\u70b9\uff0c\u4ee3\u7801\u4e0d\u50cf\u6c7d\u8f66\u90a3\u6837\u9700\u8981\u7ef4\u62a4\uff0c\u5b83\u4e0d\u4f1a\u751f\u9508\uff0c\u4e5f\u4e0d\u9700\u8981\u6211\u4eec\u56de\u6765\u4fee\u7406\uff0c\u56e0\u4e3a\u4e0d\u77e5\u600e\u4e48\u7684\u5b83\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u8fd9\u5e76\u4e0d\u662f\u6211\u4eec\u5728\u8ba1\u7b97\u673a\u4e0a\u9762\u4e34\u7684\u95ee\u9898\uff0c\u8c22\u5929\u8c22\u5730\uff0c\u4f46\u5982\u679c\u6709\u4ec0\u4e48\u53d1\u751f\u53d8\u5316\uff0c\u5982\u679c\u6211\u4eec\u610f\u8bc6\u5230\u201c\u54e6\uff0c\u8fd9\u6548\u7387\u4e0d\u9ad8\u201d\uff0c\u6709\u4eba\u5bf9\u5176\u4e2d\u4e00\u4e2a\u8fdb\u884c\u4e86\u66f4\u6539\uff0c\u90a3\u4e48\u4f60\u4e5f\u9700\u8981\u5bf9\u53e6\u4e00\u4e2a\u8fdb\u884c\u66f4\u6539\uff0c\u6216\u8005\u8fdb\u884c\u5176\u4ed6\u6570\u91cf\u7684\u5c0f\u66f4\u6539\uff0c\u6240\u4ee5\u4f60\u5bf9\u4e00\u4e2a\u6240\u505a\u7684\u4efb\u4f55\u66f4\u6539\u4e5f\u5fc5\u987b\u5bf9\u53e6\u4e00\u4e2a\u8fdb\u884c\uff0c\u8fd9\u4e0d\u4ec5\u662f\u4e3a\u4e86\u6548\u7387\u539f\u56e0\uff0c\u8fd8\u6d89\u53ca\u5230\u4efb\u4f55bug\u4fee\u590d\uff0c\u6240\u4ee5\u5728\u5927\u578b\u9879\u76ee\u4e2d\u5e38\u89c1\u7684\u9519\u8bef\u662f\uff0c\u67d0\u4eba\u7f16\u5199\u4e86\u4e00\u4e2a\u5e26\u6709\u67d0\u79cdbug\u7684\u65b9\u6cd5\uff0c\u8fd8\u6709\u4e00\u4e2a\u975e\u5e38\u76f8\u4f3c\u7684\u65b9\u6cd5\uff0c\u4ed6\u4eec\u53ea\u8ffd\u8e2a\u5e76\u4fee\u590d\u4e86\u5176\u4e2d\u4e00\u4e2a\u65b9\u6cd5\u4e2d\u7684bug\uff0c\u800c\u53e6\u4e00\u4e2a\u65b9\u6cd5\u7ee7\u7eed\u5b58\u5728\uff0c\u8fd9\u662f\u4e00\u4e2a\u5f53\u4f60\u6709\u50cf\u8fd9\u6837\u7684\u91cd\u590d\u4ee3\u7801\u65f6\u53ef\u80fd\u53d1\u751f\u975e\u5e38\u5371\u9669\u7684\u4e8b\u60c5\u3002\u6700\u540e\u4e00\u4e2a\u6211\u60f3\u63d0\u5230\u7684\u662f\uff0c\u5047\u8bbe\u6211\u4eec\u51b3\u5b9a\u4e0d\u559c\u6b22`AList`\uff0c\u800c\u662f\u559c\u6b22`DList`\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u5b9e\u9645\u4e0a\u9700\u8981\u5728\u672a\u6765\u67d0\u4e2a\u65f6\u5019\u518d\u6765\u5199\u53e6\u4e00\u4e2a`DList`\u51fd\u6570\u3002\u6240\u4ee5\u8fd9\u8282\u8bfe\u5c06\u4f1a\u5173\u4e8e\u6211\u4eec\u5982\u4f55\u4f18\u96c5\u5730\u5904\u7406\u8fd9\u4e2a\u95ee\u9898\uff0c\u5e76\u5229\u7528\u7531\u6b64\u5e26\u6765\u7684\u597d\u5904\u3002<\/p>\n\n\n\n
8.2 Hypernyms and Hyponyms<\/h3>\n\n\n\n
\u5b9e\u9645\u4e0a\uff0c\u5728\u82f1\u8bed\u4e2d\u4e5f\u4f1a\u51fa\u73b0\u7c7b\u4f3c\u7684\u60c5\u51b5\uff0c\u6240\u4ee5\u8ba9\u6211\u4eec\u505a\u4e00\u4e2a\u5c0f\u5c0f\u7684\u8bed\u6cd5\u8bfe\u3002
\u60f3\u8c61\u4e00\u4e0b\uff0c\u4f60\u6709\u5173\u4e8e\u5982\u4f55\u6e05\u6d01\u5377\u6bdb\u72d7\u7684\u6307\u793a\uff0c\u6240\u4ee5\u7b2c\u4e00\u6b65\u53ef\u80fd\u662f\u6d17\u6fa1\u524d\u5237\u4f60\u7684\u5377\u6bdb\u72d7\uff0c\u7b2c\u4e8c\u6b65\u4f7f\u7528\u6e29\u6c34\uff0c\u7b2c\u4e09\u6b65\u7528\u5e73\u9759\u7684\u58f0\u97f3\u548c\u4f60\u7684\u5377\u6bdb\u72d7\u4ea4\u8c08\uff0c\u7b2c\u56db\u6b65\u4f7f\u7528\u5377\u6bdb\u72d7\u4e13\u7528\u6d17\u53d1\u6c34\uff0c\u7b2c\u4e94\u6b65\u5f7b\u5e95\u51b2\u6d17\u5e72\u51c0\uff0c\u7b2c\u516d\u6b65\u81ea\u7136\u98ce\u5e72\uff0c\u7b2c\u4e03\u6b65\u597d\u597d\u5956\u52b1\u4f60\u7684\u5377\u6bdb\u72d7\u3002\u73b0\u5728\u5047\u8bbe\u4f60\u6709\u4e00\u53ea\u4e0d\u540c\u7684\u72d7\uff0c\u6bd4\u5982\u8bf4\u963f\u62c9\u65af\u52a0\u96ea\u6a47\u72ac\uff08Malamute\uff09\uff0c\u6211\u4eec\u53ef\u80fd\u4f1a\u8bf4\uff0c\u597d\u7684\uff0c\u90a3\u4e48\u6d17\u963f\u62c9\u65af\u52a0\u96ea\u6a47\u72ac\u7684\u6307\u793a\u662f\u4e00\u6837\u7684\uff1a\u7b2c\u4e00\u6b65\u6d17\u6fa1\u524d\u5237\u4f60\u7684\u963f\u62c9\u65af\u52a0\u96ea\u6a47\u72ac\uff0c\u7b2c\u4e8c\u6b65\u4f7f\u7528\u6e29\u6c34\uff0c\u7b2c\u4e09\u6b65\u7528\u5e73\u9759\u7684\u58f0\u97f3\u548c\u4f60\u7684\u963f\u62c9\u65af\u52a0\u96ea\u6a47\u72ac\u4ea4\u8c08\uff0c\u7b2c\u56db\u6b65\u4f7f\u7528\u963f\u62c9\u65af\u52a0\u96ea\u6a47\u72ac\u4e13\u7528\u6d17\u53d1\u6c34\uff0c\u7b2c\u4e94\u6b65\u5f7b\u5e95\u51b2\u6d17\u5e72\u51c0\uff0c\u7b2c\u516d\u6b65\u81ea\u7136\u98ce\u5e72\uff0c\u7b2c\u4e03\u6b65\u597d\u597d\u5956\u52b1\u4f60\u7684\u963f\u62c9\u65af\u52a0\u96ea\u6a47\u72ac\u3002
\u8fd9\u57fa\u672c\u4e0a\u5c31\u662f\u6211\u4eec\u5728`WordUtils`\u7c7b\u7684\u975e\u5e38\u7c97\u7cd9\u7248\u672c\u4e2d\u6240\u505a\u7684\uff0c\u6240\u4ee5\u6211\u4eec\u7956\u5148\u4e5f\u9762\u4e34\u7740\u540c\u6837\u7684\u95ee\u9898\uff0c\u4ed6\u4eec\u5fc5\u987b\u60f3\u51fa\u65e2\u80fd\u6db5\u76d6\u8fd9\u4e24\u79cd\u751f\u7269\u7684\u8bcd\uff0c\u56e0\u6b64\u5728\u82f1\u8bed\u4e2d\uff0c\u8fd9\u79cd\u8bcd\u88ab\u79f0\u4e3a\u4e0a\u4f4d\u8bcd\uff08hypernym\uff09\u3002\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u201c\u72d7\u201d\u5c31\u662f\u201c\u5377\u6bdb\u72d7\u201d\u3001\u201c\u963f\u62c9\u65af\u52a0\u96ea\u6a47\u72ac\u201d\u3001\u201c\u7ea6\u514b\u590f\u201d\u3001\u201c\u814a\u80a0\u72d7\u201d\u7b49\u7b49\u7684\u4e0a\u4f4d\u8bcd\uff0c\u8fd9\u53ea\u662f\u4e00\u4e2a\u6709\u8da3\u7684\u8bcd\u6c47\uff0c\u6211\u4eec\u53ef\u80fd\u542c\u8bf4\u8fc7\u540c\u4e49\u8bcd\uff08synonym\uff09\u3002
\u4e5f\u8bb8\u8fd8\u6709\u4e0b\u4f4d\u8bcd\uff08hyponym\uff09\uff0c\u8fd9\u4e2a\u8bcd\u8868\u793a\u7684\u662f\u76f8\u53cd\u7c7b\u578b\u7684\u5173\u8054\uff0c\u6240\u4ee5\u5c31\u50cf\u201c\u72d7\u201d\u8fd9\u4e2a\u8bcd\u662f\u201c\u5377\u6bdb\u72d7\u201d\u3001\u201c\u814a\u80a0\u72d7\u201d\u7b49\u7684\u4e0a\u4f4d\u8bcd\u4e00\u6837\uff0c\u201c\u5377\u6bdb\u72d7\u201d\u662f\u201c\u72d7\u201d\u7684\u4e0b\u4f4d\u8bcd\u3002\u6211\u4e0d\u4f1a\u6d4b\u8bd5\u4f60\u8fd9\u4e9b\uff0c\u4f46\u6211\u8ba4\u4e3a\u8fd9\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u6982\u5ff5\uff0c\u56e0\u4e3a\u5b83\u5b9e\u9645\u4e0a\u4e5f\u4f1a\u5728Java\u4e2d\u53d1\u6325\u4f5c\u7528\uff0c\u6240\u4ee5\u4e0a\u4f4d\u8bcd\u548c\u4e0b\u4f4d\u8bcd\u7ec4\u6210\u4e00\u4e2a\u5c42\u7ea7\u7ed3\u6784\uff0c\u53ef\u4ee5\u7ee7\u7eed\u5411\u4e0b\u5ef6\u4f38\u3002 \u200b<\/p>\n\n\n
\n
\"\"<\/figure>\n<\/div>\n\n\n
 \u4f8b\u5982\uff0c\u201c\u72d7\u201d\u662f\u4e00\u79cd\u201c\u72ac\u79d1\u52a8\u7269\u201d\uff08canine\uff09\uff0c\u800c\u201c\u72ac\u79d1\u52a8\u7269\u201d\u662f\u4e00\u79cd\u201c\u98df\u8089\u52a8\u7269\u201d\uff08carnivore\uff09\uff0c\u201c\u98df\u8089\u52a8\u7269\u201d\u662f\u4e00\u79cd\u201c\u52a8\u7269\u201d\uff08animal\uff09\uff0c\u7b49\u7b49\u3002\u8fd9\u4e9b\u90fd\u662f\u6240\u8c13\u7684\u201c\u662f\u4e00\u79cd\u201d\uff08is-a\uff09\u5173\u7cfb\uff0c\u4f60\u5b9e\u9645\u4e0a\u53ef\u4ee5\u4e3a\u82f1\u8bed\u4e2d\u7684\u6bcf\u4e00\u4e2a\u540d\u8bcd\u6784\u5efa\u8fd9\u6837\u7684\u7f51\u7edc\u3002\u6709\u4e00\u4e2a\u53eb\u505aWordNet\u7684\u9879\u76ee\uff0c\u8fd9\u662f\u4e00\u4e2a\u5b66\u672f\u9879\u76ee\uff0c\u4ed6\u4eec\u5df2\u7ecf\u6536\u96c6\u4e86\u6210\u5343\u4e0a\u4e07\u7684\u540d\u8bcd\uff0c\u5e76\u6784\u5efa\u4e86\u4e00\u4e2a\u5de8\u5927\u7684\u56fe\u8868\uff0c\u770b\u8d77\u6765\u50cf\u8fd9\u6837\u3002<\/p>\n\n\n\n
8.3 The interface and implements KeyWords<\/h3>\n\n\n\n
\u539f\u6765Java\u6709\u80fd\u529b\u4ee5\u4e00\u79cd\u6b63\u5f0f\u7684\u65b9\u5f0f\u6355\u6349\u7c7b\u4e4b\u95f4\u7684\u8fd9\u4e9b\u5173\u7cfb\uff0c\u5c31\u50cf\u4f60\u548c\u6211\u77e5\u9053`SList`\u548c`AList`\u90fd\u662f\u67d0\u79cd\u5217\u8868\u4e00\u6837\uff0c\u6709\u4e00\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5728Java\u4e2d\u5b9e\u9645\u8868\u8fbe\u8fd9\u4e00\u70b9\u3002\u90a3\u4e48\u6211\u4eec\u600e\u4e48\u505a\u5462\uff1f\u8fd9\u662f\u4e00\u4e2a\u4e24\u6b65\u7684\u8fc7\u7a0b\uff0c\u7b2c\u4e00\u90e8\u5206\u662f\u5b9a\u4e49\u4e00\u4e2a\u53c2\u8003\u7c7b\u578b\u6765\u8868\u793a\u6211\u4eec\u7684\u4e0a\u4f4d\u8bcd\uff0c\u6240\u4ee5\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5bf9\u4e0d\u8d77\uff0c\u63d0\u9192\u4e00\u4e0b\u4ec0\u4e48\u662f\u53c2\u8003\u7c7b\u578b\uff0c\u8bb0\u5f97\u5728Java\u4e2d\u6709\u516b\u79cd\u539f\u59cb\u7c7b\u578b\uff1a`short`\u3001`long`\u3001`float`\u7b49\uff0c\u800c\u53c2\u8003\u7c7b\u578b\u662f\u9664\u6b64\u4e4b\u5916\u7684\u6240\u6709\u4e1c\u897f\uff0c\u56e0\u6b64\u6211\u4eec\u77e5\u9053\u6211\u4eec\u53ef\u4ee5\u5b9a\u4e49\u65b0\u7684\u7c7b\u578b\uff0c\u6bd4\u5982`Planet`\u3001`Body`\u3001`AList`\uff0c\u73b0\u5728\u6211\u4eec\u8981\u5b9a\u4e49\u4e00\u4e2a\u53eb`List61b`\u7684\u7c7b\u578b\uff0c\u4f46\u6211\u4eec\u4f1a\u770b\u5230\u8fd9\u4e0e\u901a\u5e38\u7684\u505a\u6cd5\u7a0d\u6709\u4e0d\u540c\u3002\u7b2c\u4e8c\u90e8\u5206\uff0c\u4e00\u65e6\u6211\u4eec\u8bbe\u7f6e\u597d\u8fd9\u4e2a\u4e1c\u897f\uff0c\u6211\u4eec\u5c06\u6307\u5b9a`SList`\u548c`AList`\u5b9e\u9645\u4e0a\u662f`List61b`\u7684\u4e0b\u4f4d\u8bcd\u3002<\/p>\n\n\n\n
\u90a3\u4e48\uff0c\u8ba9\u6211\u4eec\u5f00\u59cb\u8ba8\u8bba\u5982\u4f55\u8bbe\u7f6e\u4e00\u4e2a\u4e0a\u4f4d\u8bcd\u3002\u6211\u4eec\u8981\u505a\u7684\u662f\u4f7f\u7528\u4e00\u4e2a\u65b0\u7684\u5173\u952e\u5b57\uff0c\u6211\u4eec\u4ee5\u524d\u6ca1\u6709\u7528\u8fc7\u7684\uff0c\u53eb\u505a`interface`\uff0c\u8fd9\u5c06\u4ee3\u66ff`class`\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u4e4b\u524d\u6211\u4eec\u603b\u662f\u8bf4`public class Lists61b`\uff0c\u73b0\u5728\u6211\u4eec\u53ea\u9700\u8981\u8bf4`interface`\u4ee3\u66ff`class`\u3002\u4e3a\u4ec0\u4e48\u662f`interface`\u5462\uff1f\u5b83\u4f1a\u6709\u4e00\u4e9b\u4e0e\u4f60\u5e94\u8be5\u5728`class`\u4e2d\u505a\u7684\u4e8b\u60c5\u7565\u6709\u4e0d\u540c\u7684\u5730\u65b9\uff0c\u6211\u4eec\u7a0d\u540e\u4f1a\u770b\u5230\u8fd9\u4e9b\u4e0d\u540c\u3002\u4e3b\u8981\u7684\u60f3\u6cd5\u662f\uff0c\u63a5\u53e3\u662f\u4e00\u4e2a\u5217\u8868\u53ef\u4ee5\u505a\u4ec0\u4e48\u7684\u89c4\u8303\uff0c\u800c\u4e0d\u662f\u5982\u4f55\u53bb\u505a\u3002\u90a3\u4e48\u5217\u8868\u53ef\u4ee5\u505a\u4ec0\u4e48\u5462\uff1f\u4f8b\u5982\uff0c\u6211\u77e5\u9053\u5b83\u5e94\u8be5\u80fd\u591f\u505a\u5230\uff0c\u6211\u53ef\u4ee5\u53bb\u770b\u4e00\u4e2a\u5217\u8868\uff0c\u6211\u53ef\u4ee5\u770b\u7b2c\u4e00\u4e2a\uff0c\u6211\u4e0d\u77e5\u9053\uff0c\u4e5f\u8bb8\u6211\u4f1a\u53bb\u9876\u90e8\uff0c\u6211\u77e5\u9053\u6bcf\u4e2a\u5217\u8868\u90fd\u5e94\u8be5\u80fd\u591f\u505a\u5230\u6700\u540e\u4e00\u4e2a\uff0c\u597d\u7684\uff0c\u6240\u4ee5\u53ef\u4ee5\u505a`public void addLast(Item x)`\uff0c\u73b0\u5728\uff0c\u4e0e\u5176\u5b9e\u9645\u5199\u51fa\u8fd9\u4e2a\u65b9\u6cd5\u7684\u4ee3\u7801\uff0c\u6211\u5b9e\u9645\u4e0a\u53ea\u662f\u653e\u4e00\u4e2a\u5206\u53f7\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u4e86\u3002\u4e0d\u8fc7\u8fd9\u91cc\u5176\u5b9e\u6709\u4e00\u4e2a\u5c0f\u95ee\u9898\uff0c\u4f60\u4f1a\u6ce8\u610f\u5230\u8fd9\u91cc\u6709\u4e00\u4e2a\u201c\u65e0\u6cd5\u89e3\u6790\u7b26\u53f7\u2018Item\u2019\u201d\u7684\u9519\u8bef\uff0c\u56e0\u4e3a\u6211\u5fd8\u8bb0\u5728\u8fd9\u91cc\u5bfc\u5165\u76f8\u5e94\u7684\u7c7b\u578b\u4e86\uff0c\u597d\u7684\uff0c\u6240\u4ee5\u6253\u5b57\u7684\u65f6\u5019\u51fa\u4e86\u4e2a\u5c0f\u5dee\u9519\u3002<\/p>\n\n\n\n
\u5230\u4e86\u8fd9\u4e2a\u65f6\u5019\uff0c\u6211\u57fa\u672c\u4e0a\u662f\u5728\u8bf4`List61b`\u5e94\u8be5\u80fd\u591f\u6dfb\u52a0\u5143\u7d20\uff0c\u6240\u4ee5\u5b83\u4e0d\u4f1a\u901a\u8fc7\u8fd9\u4e2a`AList`\u7c7b\u624b\u52a8\u67e5\u627e\u6240\u6709\u8fd9\u4e9b\u5e76\u590d\u5236\u8fc7\u6765\uff0c\u4f46\u6211\u5b9e\u9645\u4e0a\u8981\u505a\u4e9b\u522b\u7684\u4e8b\u60c5\uff0c\u6211\u8981\u628a\u6240\u6709\u7684\u4e1c\u897f\u90fd\u590d\u5236\u8fc7\u6765\uff0c\u4ee5\u4fbf\u66f4\u597d\u5730\u8bf4\u660e\u6211\u7684\u89c2\u70b9\u3002\u5f53\u4f60\u590d\u5236\u6240\u6709\u7684\u4e1c\u897f\u8fc7\u6765\u65f6\uff0c\u6ce8\u610f\u8fd9\u91cc\u7684\u4e00\u70b9\uff0c\u8fd9\u4e9b\u662f\u79c1\u6709\u53d8\u91cf\uff0c\u5b83\u4eec\u8bf4\u4f60\u5e94\u8be5\u5982\u4f55\u5b58\u50a8\u4fe1\u606f\uff0c\u4e0d\u662f\u6bcf\u4e2a\u5217\u8868\u90fd\u5e94\u8be5\u6709\u4e00\u4e2a\u6570\u7ec4\uff0c\u5bf9\u5427\uff1f\u6240\u4ee5\u8fd9\u4e0d\u662f\u6210\u4e3a\u5217\u8868\u7684\u4e00\u90e8\u5206\uff0c\u6709\u4e9b\u5217\u8868\u6839\u672c\u6ca1\u6709\u6570\u7ec4\uff0c\u6211\u4e0d\u9700\u8981\u6784\u9020\u51fd\u6570\uff0c\u6211\u7684\u610f\u601d\u662f\uff0c\u8fd9\u4e0d\u662f\u4e00\u4e2a\u660e\u663e\u7684\u4e8b\u5b9e\uff0c\u4f46\u6211\u4e0d\u8981\u6c42\u8c03\u6574\u5927\u5c0f\uff0c\u8fd9\u662f\u6211\u8981\u4fdd\u7559\u7684\u4e1c\u897f\u5417\uff1f\u4e0d\uff0c\u6709\u4e9b\u5217\u8868\u4e0d\u4f1a\u8c03\u6574\u5927\u5c0f\uff0c\u6bd4\u5982`DList`\u6216`SLess`\uff0c\u6ca1\u6709\u8c03\u6574\u5927\u5c0f\u7684\u6982\u5ff5\uff0c\u6240\u4ee5\u6211\u5b8c\u5168\u5220\u9664\u5b83\uff0c\u4e8b\u5b9e\u4e0a\uff0c\u8fd9\u4e2a\u662f\u79c1\u6709\u7684\uff0c\u4f60\u751a\u81f3\u4f1a\u6ce8\u610f\u5230\uff0c\u5982\u679c\u6211\u9ad8\u4eae\u8fd9\u4e2a\u79c1\u6709\uff0c\u8fd9\u91cc\u4e0d\u5141\u8bb8\u6709\u79c1\u6709\u7684\uff0c\u79c1\u6709\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u79d8\u5bc6\u7684\u5b9e\u73b0\u7ec6\u8282\uff0c\u6240\u4ee5\u628a\u5b83\u4f5c\u4e3a\u5217\u8868\u63a5\u53e3\u7684\u4e00\u90e8\u5206\u662f\u6ca1\u6709\u610f\u4e49\u7684\uff0c\u6ca1\u6709\u4eba\u4f1a\u7528\u5230\u5b83\uff0c\u90a3\u4e48`addLast`\u5462\uff1f\u597d\u7684\uff0c\u6211\u4eec\u5df2\u7ecf\u6709\u4e86\uff0c\u542c\u8d77\u6765\u4e0d\u9519\uff0c\u5217\u8868\u5e94\u8be5\u6709`getLast`\u5417\uff1f\u597d\u7684\uff0c\u73b0\u5728\u6211\u611f\u89c9\u4e0d\u9519\uff0c\u5bf9\uff0c\u597d\u7684\uff0c\u770b\u8d77\u6765\u50cf\u662f\u4e00\u4e2a\u6b63\u5e38\u7684\u5217\u8868\u64cd\u4f5c\uff0c\u6ce8\u610f\u6211\u5728\u8fd9\u91cc\u4fdd\u7559\u7684\u662f\u516c\u5171\u7684\u65b9\u6cd5\uff0c\u8fd9\u91cc\u662f`removeLast`\uff0c\u8fd9\u91cc\u662f`insert`\uff0c\u770b\u8d77\u6765\u4e0d\u9519\uff0c\u8fd8\u6709`getFirst`\uff0c\u6240\u4ee5\u5982\u679c\u6211\u67e5\u770b\u6240\u6709\u8fd9\u4e9b\uff0c\u4f60\u4f1a\u6ce8\u610f\u5230\u4e00\u4ef6\u6709\u8da3\u7684\u4e8b\u60c5\uff0c\u6211\u5df2\u7ecf\u6307\u5b9a\u4e86`List61b`\u662f\u4ec0\u4e48\uff0c\u800c\u4e0d\u662f\u5982\u4f55\u5b9e\u73b0\uff0c\u6240\u4ee5\u5982\u679c\u6211\u4eec\u8003\u8651\u6211\u521b\u9020\u7684\u8fd9\u4e2a\u5b87\u5b99\uff0c\u8fd9\u5c31\u662f`List61b`\u53ef\u4ee5\u505a\u7684\u4e00\u5207\uff0c\u4f60\u53ef\u4ee5\u51e0\u4e4e\u50cf\u4e00\u4e2a\u8b66\u5bdf\u5e94\u8be5\u80fd\u591f\u505a\u7684\u4e8b\u60c5\u7684\u89c4\u8303\u4e00\u6837\u601d\u8003\u8fd9\u4e2a\u95ee\u9898\uff0c<\/p>\n\n\n\n
We will use the new keyword interface instead of class to define a List61B.\n>Idea: Interface is a specification of what a List is able to do, not how to do it. \n\u8fd9\u662fList61B.java\n\n\npublic interface List61B<Item>{\n    public void addFirst(Itemx); \n    public void addLast(Item y);\n    public Item getFirst();\n    public Item getLast(); \n    public Item removeLast(); \n    public Item get(int i);\n    public void insert(Item x, int position); \n    public int size();\n} <\/code><\/pre>\n\n\n\n
\u6bd4\u5982\u8bf4\uff0c\u4e00\u4e2a\u8b66\u5bdf\u5e94\u8be5\u80fd\u591f\u505a\u4ec0\u4e48\uff0c\u53d6\u6307\u7eb9\u3001\u6253\u7535\u8bdd\u3001\u5f00\u8f66\u7b49\uff0c\u6240\u6709\u4e00\u4e2a\u8b66\u5bdf\u5e94\u8be5\u80fd\u591f\u505a\u7684\u4e8b\u60c5\uff0c\u8fd9\u5c31\u662f\u5217\u8868\uff0c\u5982\u679c\u6709\u4eba\u8bf4\u6211\u662f\u8b66\u5bdf\uff0c\u4f60\u53ef\u4ee5\u5047\u8bbe\u662f\u7684\uff0c\u4ed6\u4eec\u77e5\u9053\u5982\u4f55\u5f00\u8f66\uff0c\u90a3\u4e48\u63a5\u4e0b\u6765\u7684\u4e8b\u60c5\u662f\u4ec0\u4e48\u5462\uff1f\u4e0b\u4e00\u6b65\u662f\u6211\u4eec\u5c06\u6307\u5b9a\u67d0\u7269\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a`List61b`\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u65b0\u7684`implements`\u5173\u952e\u5b57\u6765\u6307\u5b9a\u8fd9\u79cd\u5173\u7cfb\uff0c\u5c31\u50cf\u4e4b\u524d\u6211\u4eec\u6709\u4e86`interface`\u4f5c\u4e3a\u65b0\u4e1c\u897f\uff0c\u73b0\u5728\u6211\u4eec\u5c06\u6709`implements`\uff0c\u5b83\u770b\u8d77\u6765\u6709\u70b9\u50cf\u8fd9\u6837\u3002 \u200b\"\"<\/p>\n\n\n\n
 \u6240\u4ee5\u8ba9\u6211\u4eec\u8fdb\u5165\u6211\u4eec\u7684`AList`\u7c7b\uff0c\u7136\u540e\u8bf4`implements List61b`\uff0c\u73b0\u5728\u6211\u5b9e\u9645\u4e0a\u72af\u4e86\u4e00\u4e2a\u9519\u8bef\uff0c\u9664\u975e\u662f`61p Item`\uff0c\u6211\u5f53\u65f6\u5728\u60f3\u6211\u7684\u624b\u673a\u54cd\u4e86\uff0c\u8ba9\u6211\u5206\u5fc3\u4e86\u3002<\/p>\n\n\n\n
\u6240\u4ee5\u6211\u4eec`implement List61b`\u548c`Item`\uff0c\u5c31\u662f\u8fd9\u6837\uff0c\u73b0\u5728\u6211\u4eec\u8981\u5bf9`SList`\u505a\u540c\u6837\u7684\u4e8b\u60c5\uff0c`implements List61b`\uff0c\u5c31\u662f\u8fd9\u6837\uff0c\u6240\u4ee5\u4e00\u65e6\u6211\u505a\u4e86\u8fd9\u4e9b\uff0c\u8fd9\u5c31\u662f\u6211\u4eec\u751f\u6d3b\u7684\u5b87\u5b99\u3002\u6240\u4ee5\u8fd9\u4e5f\u5e94\u8be5\u5339\u914d\u65e9\u671f\u7684\u90a3\u4e2a\u5de5\u4f5c\uff0cJosh\uff0c\u4f60\u5e94\u8be5\u95ee\u6211\uff0c\u90a3\u4e48\u73b0\u5728\u600e\u4e48\u6837\u4e86\uff1f\u597d\u7684\uff0c\u6240\u4ee5\u8bb0\u5f97\u6211\u4eec\u7684`Longest`\u7c7b\uff0c\u6211\u4eec\u4e0d\u559c\u6b22\u6709\u591a\u4e2a`Longest`\u65b9\u6cd5\uff0c\u6709\u4e9b\u9488\u5bf9`SList`\uff0c\u6709\u4e9b\u9488\u5bf9`AList`\uff0c\u6240\u4ee5\u73b0\u5728\u6211\u4eec\u5b9a\u4e49\u4e86\u8fd9\u4e2a\u63a5\u53e3\uff0c\u6211\u4eec\u5b9e\u9645\u4e0a\u53ef\u4ee5\u505a`List61b`\uff0c\u8fd9\u6837\u5e94\u8be5\u6ca1\u95ee\u9898\uff0c\u6240\u4ee5\u5982\u679c\u6211\u4eec\u8fd0\u884c\u8fd9\u6bb5\u4ee3\u7801\uff0c\u4f60\u770b\u6211\u4eec\u5f97\u5230\u201cwatching\u201d\uff0c\u5373\u4f7f\u6211\u4eec\u5728\u6d4b\u8bd5\u9a71\u52a8\u4e2d\u5c06`AList`\u6539\u4e3a`SList`\uff0c\u518d\u6b21\u8fd0\u884c\uff0c\u5b83\u5c31\u50cf\u4e4b\u524d\u4e00\u6837\uff0c\u5982\u679c\u6211\u4eec\u6709\u4e86\u89e3\u91ca\u5982\u4f55\u6d17\u72d7\u7684\u6307\u793a\uff0c\u6211\u4eec\u73b0\u5728\u5efa\u9020\u4e86\u4e00\u53f0\u53ef\u4ee5\u6e05\u6d17\u4efb\u4f55\u79cd\u7c7b\u7684\u72d7\u7684\u673a\u5668\uff0c\u4e0d\u4ec5\u662f\u963f\u62c9\u65af\u52a0\u96ea\u6a47\u72ac\uff0c\u4e0d\u4ec5\u662f\u5377\u6bdb\u72d7\uff0c\u800c\u662f\u4efb\u4f55\u72d7\u3002<\/p>\n\n\n\n
WordUtils.java<\/p>\n\n\n\n
public class WordUtils {\n    \/** Returns the length of the longest word. *\/\n    public static String longest(List61B<String> list){\n        int maxDex = 0\uff1b\n        for (int i= 0\uff1b i < list.size(); i +=1){\n            String longestString = list.get(maxDex);\n            String thisstring = list.get(i);\n            if(thisString.length()> longestString.length(){\n                maxDex = i;\n            }\n        }\n        return list.get(maxDex);\n    }\n\n    public static void main(String[] args){\n        AList<String> someList = new AList<>();\n        someList.addLast(x\"elk\");\n        someList.addLast(x\"are\");\n        someList.addLast(\"watching\");\n        System.out.println(longest(someList);\n        \/\/someList.print();\n    }\n}<\/code><\/pre>\n\n\n\n
AList.java\u90e8\u5206\u9700\u4fee\u6539<\/p>\n\n\n\n
AList\n\/** Array based list.\n*@author Josh Hug\n*\/\n\/* The next item ALWAYS goes in the size position *\/\npublic class AList<Item> implements List61B<Item> {\n    \/* the stored integers *\/\n    private Item[] items;\n    private int size;\n\n    private static int RFACTOR = 2\uff1b\n    \/** Creates an empty list. *\/\n    public AList(){\n        size = 0\uff1b\n        items = (Item[]) new Object[100];\n    }\n\n    \/** Resize our backing array so that it is\n        *of the given capacity.*\/\n    private void resize(int capacity){\n        Item[] a = (Item[]) new Object[capacity];\n        System.arraycopy(items, srcPos:0, a, destPos:0,size);\n        items = a;\n    }\n\n    \/** Inserts X into the back of the list. *\/\n    public void addLast(Item x) {\n        if (size == items.length){\n.................<\/code><\/pre>\n\n\n\n
SLList.java\u90e8\u5206\u9700\u4fee\u6539<\/p>\n\n\n\n
\/\/SLListNode\n\/* Represent a list of stuff, where all the \"list\" work is delegated\nto a naked recursive data structure.*\/\n\npublic class SLList<Blorp> implements List61B<Blorp>{\n    public class Node {\n        public Blorp item;    \/*Equivalent of first*\/\n        public Node next;     \/* Equivalent of rest *\/\n    \n        public Node(Blorp i, Node h) {\n            item = i;\n            next = h;\n        }\n    }\n\n    private Node sentinel;\n    private int size;\n\n    \/** Creates an empty list. *\/\n    public SLList(){\n        size = 0\uff1b\n        sentinel = new Node(null,null);\n    }\n    public SLList(Blorp x){\n        size = 1\uff1b\n        sentinel = new Node(null,null);\n        sentinel.next = new Node(x,null);\n    }\n    \/** Adds an item of the front. *\/\n................................<\/code><\/pre>\n\n\n\n
8.4 overriding and overloading<\/h3>\n\n\n\n
\u8ba9\u6211\u4eec\u4ecb\u7ecd\u4e00\u4e2a\u91cd\u8981\u7684\u672f\u8bed\uff0c\u5373\u6211\u4eec\u521a\u624d\u6240\u505a\u7684\uff0c\u53eb\u505a\u8986\u5199\uff08Overriding\uff09\uff0c\u6211\u5c06\u5bf9\u6bd4\u4e4b\u524d\u6211\u4eec\u770b\u5230\u7684\u8fc7\u8f7d\uff08Overloading\uff09\u3002\u90a3\u4e48\u4ec0\u4e48\u662f\u8986\u5199\u5462\uff1f\u5176\u5b9e\u8fd9\u662f\u4e00\u4e2a\u76f8\u5f53\u7b80\u5355\u7684\u60f3\u6cd5\uff0c\u5982\u679c\u6211\u4eec\u6709\u4e00\u4e2a\u5b50\u7c7b\uff0c\u6bd4\u5982`List`\uff0c\u5b83\u6709\u4e00\u4e2a\u65b9\u6cd5\u53eb\u505a`addLast(Item)`\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u7684\u7b7e\u540d\u4e0e\u8d85\u7c7b\u4e2d\u7684\u5b8c\u5168\u76f8\u540c\uff0c\u90a3\u4e48\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u8bf4`AList`\u7c7b\u4e2d\u7684`addLast(Item)`\u8986\u5199\u4e86\u8d85\u7c7b`List61B`\u4e2d\u7684`addLast`\uff0c\u6216\u8005\u7b80\u800c\u8a00\u4e4b\uff0c\u6211\u4eec\u53ef\u4ee5\u8bf4`AList`\u8986\u5199\u4e86`addLast`\u3002\u8986\u5199\u5176\u5b9e\u662f\u4e00\u4e2a\u76f8\u5f53\u76f4\u89c2\u7684\u6982\u5ff5\uff0c\u6240\u4ee5\u8ba9\u6211\u4eec\u4e0e\u4e4b\u524d\u770b\u5230\u7684\u8fc7\u8f7d\u8fdb\u884c\u6bd4\u8f83\u3002 \u200b\"\"<\/p>\n\n\n\n
\u8fd9\u91cc\u6211\u6709\u4e00\u4e2a\u4e0d\u540c\u7684\u8986\u5199\u7684\u4f8b\u5b50\uff0c\u5176\u4e2d\u6211\u4eec\u6709\u4e00\u4e2a\u53eb\u505a`Animal`\u7684\u63a5\u53e3\uff0c\u5b83\u6709\u4e00\u4e2a`makeNoise`\u65b9\u6cd5\uff0c\u800c`Pig`\u4e5f\u6709\u4e00\u4e2a`makeNoise`\u65b9\u6cd5\uff0c\u5176\u7b7e\u540d\u5b8c\u5168\u76f8\u540c\uff0c\u6240\u4ee5`Pig`\u8986\u5199\u4e86`makeNoise`\u3002\u90a3\u4e48\u4ec0\u4e48\u662f\u8fc7\u8f7d\u5462\uff1f\u5f53\u6709\u591a\u4e2a\u65b9\u6cd5\u540d\u79f0\u76f8\u540c\u4f46\u7b7e\u540d\u4e0d\u540c\u65f6\uff0c\u6211\u4eec\u5c31\u79f0\u4e4b\u4e3a\u8fc7\u8f7d\u3002\u6240\u4ee5\uff0c\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u6709\u4e00\u4e2a\u516c\u5171\u7c7b`Dog`\u5b9e\u73b0\u4e86`Animal`\u63a5\u53e3\uff0c\u5e76\u4e14\u5b83\u6709\u4e00\u4e2a\u63a5\u53d7`Dog`\u7c7b\u578b\u53c2\u6570\u7684`makeNoise`\u65b9\u6cd5\uff0c\u8fd9\u6837\u4f60\u5bf9\u5176\u4ed6\u72d7\u505a\u51fa\u7684\u53cd\u5e94\u4e0e\u81ea\u8a00\u81ea\u8bed\u65f6\u4e0d\u540c\uff0c\u90a3\u4e48\u6211\u4eec\u8bf4`makeNoise`\u662f\u8fc7\u8f7d\u7684\u3002\u4e0e\u4e4b\u524d\u6211\u4eec\u8bf4\u7684\u201cA\u8986\u5199\u4e86B\u201d\u4e0d\u540c\uff0c\u5bf9\u4e8e\u8fc7\u8f7d\uff0c\u6211\u4eec\u53ea\u662f\u8bf4\u8be5\u65b9\u6cd5\u6574\u4f53\u4e0a\u662f\u8fc7\u8f7d\u7684\uff0c\u4e0d\u662f\u67d0\u4e2a\u4eba\u8fc7\u8f7d\u4e86\u53e6\u4e00\u4e2a\u4eba\uff0c\u800c\u662f\u6574\u4e2a\u65b9\u6cd5\u8fc7\u8f7d\u4e86\u3002\u6211\u7528\u6765\u8bb0\u5fc6\u8fd9\u4e00\u70b9\u7684\u65b9\u6cd5\u662f\u60f3\u8c61\u592a\u591a\u4eba\u5728\u540c\u4e00\u65f6\u95f4\u4f7f\u7528\u7535\u529b\uff0c\u5bfc\u81f4\u7535\u8def\u65ad\u8def\u5668\u8df3\u95f8\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u7535\u8def\u65ad\u8def\u5668\u8fc7\u8f7d\u4e86\uff0c\u4e0d\u662f\u67d0\u4eba\u8fc7\u8f7d\u4e86\u53e6\u4e00\u4eba\uff0c\u800c\u662f\u6574\u4e2a\u7cfb\u7edf\u8fc7\u8f7d\u4e86\u3002\u8fd9\u53ea\u662f\u6211\u6709\u65f6\u4f7f\u7528\u7684\u4e00\u4e2a\u52a9\u8bb0\u65b9\u6cd5\uff0c\u4f46\u4e8b\u5b9e\u4e0a\u4e5f\u662f\u5982\u6b64\u3002<\/p>\n\n\n\n
\u987a\u4fbf\u8bf4\u4e00\u53e5\uff0c\u8fd9\u4e2a\u8fc7\u8f7d\u7684\u6982\u5ff5\u540c\u6837\u9002\u7528\u4e8e\u5b8c\u5168\u6ca1\u6709\u7ee7\u627f\u5173\u7cfb\u7684\u60c5\u51b5\u3002\u4f8b\u5982\uff0c\u5728`Math`\u7c7b\u4e2d\uff0c\u6709\u4e24\u4e2a\u53eb\u505a`abs`\u7684\u65b9\u6cd5\uff0c\u4e00\u4e2a\u662f\u7528\u4e8e\u6574\u6570\u7684\u7edd\u5bf9\u503c\u8ba1\u7b97\uff0c\u53e6\u4e00\u4e2a\u662f\u7528\u4e8e\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\u7684\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u6211\u4eec\u4e5f\u8bf4`abs`\u662f\u8fc7\u8f7d\u7684\u3002<\/p>\n\n\n\n
\u8986\u5199\u662f\u4ec5\u9002\u7528\u4e8e\u7ee7\u627f\u5173\u7cfb\u7684\u60c5\u51b5\uff0c\u5e76\u4e14\u53ea\u6709\u5f53\u65b9\u6cd5\u7b7e\u540d\u5b8c\u5168\u76f8\u540c\u65f6\u624d\u53d1\u751f\uff1b\u800c\u8fc7\u8f7d\u5219\u53d1\u751f\u5728\u5404\u79cd\u573a\u5408\uff0c\u4efb\u4f55\u65f6\u5019\u4f60\u6709\u4e24\u4e2a\u540d\u79f0\u76f8\u540c\u4f46\u7b7e\u540d\u4e0d\u540c\u7684\u65b9\u6cd5\u65f6\u5c31\u4f1a\u53d1\u751f\u8fc7\u8f7d\u3002<\/p>\n\n\n\n
\u65e2\u7136\u6211\u4eec\u73b0\u5728\u7406\u89e3\u4e86\u4ec0\u4e48\u662f\u8986\u5199\uff0c\u6211\u5c06\u5411\u4f60\u4eec\u4ecb\u7ecd\u53e6\u4e00\u4e2a\u7a0d\u5fae\u6709\u4e9b\u5947\u602a\u7684\u8bed\u6cd5\uff0c\u5373\u572861B\u8bfe\u7a0b\u4e2d\uff0c\u4efb\u4f55\u65f6\u5019\u6211\u4eec\u6709\u4e00\u4e2a\u8986\u5199\u7684\u65b9\u6cd5\uff0c\u6211\u4eec\u90fd\u4f1a\u4f7f\u7528`@Override`\u6ce8\u89e3\u3002\u6240\u4ee5\uff0c\u5982\u679c\u6211\u4eec\u67e5\u770b\u4ee3\u7801\uff0c\u53ef\u4ee5\u770b\u5230\uff0c`AList`\u7c7b\u4e2d\u4efb\u4f55\u8986\u5199`List`\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u7684\u5730\u65b9\uff0c\u6211\u4eec\u90fd\u4f1a\u6dfb\u52a0\u4e00\u4e2a`@Override`\u6807\u7b7e\u3002<\/strong>\u6240\u4ee5\u8fd9\u4e0d\u8986\u5199\uff0c\u90a3\u662f\u6784\u9020\u5668\uff0c\u90a3\u662f\u4e2a\u79c1\u6709\u65b9\u6cd5\uff0c\u4f46\u8fd9\u4e2a\u8986\u5199\u4e86\uff0c\u6240\u6709ID\u8986\u5199\uff0c\u6211\u5728\u8fd9\u91cc\u52a0\u4e0a`@Override`\uff0c\u5728\u8fd9\u91cc\u52a0\u4e0a`@Override`\uff0c\u8fd8\u6709\u8fd9\u4e2a\uff0c\u6211\u8ba4\u4e3a\u5b8c\u6210\u4e86\uff0c`@Override`\uff0c\u9996\u5148\u662f`addLast`\uff0c\u7136\u540e\u662f`getFirst`\u3002\u6240\u4ee5\u6211\u5728\u6240\u6709\u8fd9\u4e9b\u5730\u65b9\u90fd\u6dfb\u52a0\u4e86`@Override`\u6807\u7b7e\u3002<\/p>\n\n\n\n
\u90a3\u4e48\u6211\u4e3a\u4ec0\u4e48\u8981\u8fd9\u4e48\u505a\u5462\uff1f\u8fd9\u4e2a\u6807\u7b7e\u552f\u4e00\u7684\u529f\u80fd\u662f\uff0c\u5982\u679c\u6211\u5b9e\u9645\u4e0a\u6ca1\u6709\u8986\u5199\uff0c\u90a3\u4e48\u4ee3\u7801\u5c31\u4e0d\u4f1a\u7f16\u8bd1\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u6765\u5230\u8fd9\u91cc\uff0c\u5c1d\u8bd5\u8bf4`resize`\u662f\u8986\u5199\u7684\uff0c\u6211\u4eec\u4f1a\u770b\u5230\u9519\u8bef\uff0c\u5b83\u4f1a\u544a\u8bc9\u6211\u5b9e\u9645\u4e0a\u5e76\u6ca1\u6709\u8986\u5199\u3002\u6240\u4ee5\u8fd9\u53ef\u80fd\u770b\u8d77\u6765\u6709\u70b9\u611a\u8822\uff0c\u50cf\u662f\u4e00\u4e2a\u65e0\u7528\u7684\u6807\u7b7e\uff0c\u4f46\u6211\u4eec\u5728\u8fd9\u91cc\u4f7f\u7528\u5b83\u5b9e\u9645\u4e0a\u662f\u6709\u7528\u7684\u3002\u5c3d\u7ba1\u9664\u4e86\u63a7\u5236\u662f\u5426\u7f16\u8bd1\u4e4b\u5916\u5b83\u6ca1\u6709\u4efb\u4f55\u5176\u4ed6\u6548\u679c\uff0c\u4f46\u6211\u8ba4\u4e3a\u5b83\u6709\u51e0\u4e2a\u6709\u7528\u7684\u539f\u56e0\u3002\u9996\u5148\uff0c\u5b83\u53ef\u4ee5\u9632\u6b62\u6253\u5b57\u9519\u8bef\uff0c\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u8ba4\u4e3a\u6211\u5199\u7684\u662f`addFirst`\uff0c\u4f46\u7531\u4e8e\u6253\u5b57\u9519\u8bef\u6211\u5199\u6210\u4e86`adFirst`\uff0c\u5f53\u6211\u52a0\u4e0a`@Override`\u6807\u7b7e\u65f6\uff0c\u5b83\u4f1a\u544a\u8bc9\u6211\u201c\u5b9e\u9645\u4e0a\u4f60\u6ca1\u6709\u8986\u5199\uff0c\u56e0\u4e3a\u6ca1\u6709`adFirst`\u65b9\u6cd5\u201d\uff0c\u6211\u68c0\u67e5\u4e86\u4e00\u4e0b`List61B`\uff0c\u786e\u5b9e\u6ca1\u6709`adFirst`\u65b9\u6cd5\u3002\u6240\u4ee5\u8fd9\u662f\u4e00\u4e2a\u6355\u83b7\u6253\u5b57\u9519\u8bef\u7684\u65b9\u6cd5\u3002\u53e6\u4e00\u4e2a\u539f\u56e0\u662f\uff0c\u7a0b\u5e8f\u5458\u80fd\u591f\u770b\u5230`@Override`\u6807\u7b7e\uff0c\u5e76\u60f3\u5230\u201c\u54e6\uff0c\u6211\u73b0\u5728\u8bb0\u8d77\u6765\u4e86\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u662f\u4ece\u4e0a\u9762\u6765\u7684\u201d\uff0c\u8fd9\u5bf9\u4e8e\u601d\u8003\u7a0b\u5e8f\u7684\u5de5\u4f5c\u65b9\u5f0f\u53ef\u80fd\u662f\u6709\u7528\u7684\u3002<\/p>\n\n\n\n
If a subclass has a method with the exact same signature as in the superclass, we say the subclass overrides the method.<\/p>\n\n\n\n
    \n
  • Even if you don't write @Override, subclass still overrides the method.<\/li>\n\n\n\n
  • @Override is just an optional reminder that you're overriding.<\/li>\n<\/ul>\n\n\n\n
    Why use @Override?<\/p>\n\n\n\n
    Main reason: Protects against typos.<\/p>\n\n\n\n
    1.If you say @Override, but it the method isn't actually overriding anything, you'll get a compile error.
    2.e.g. public void addLats(Item x)<\/p>\n\n\n\n
    Reminds programmer that method definition came from somewhere higher up in the inheritance hierarchy.<\/p>\n\n\n\n
    \u91cd\u8981\u7684\u662f\u8981\u8bb0\u4f4f\uff0c\u5373\u4f7f\u4f60\u4e0d\u4f7f\u7528`@Override`\u6807\u7b7e\uff0c\u4f60\u4ecd\u7136\u662f\u5728\u8986\u5199\u3002\u8fd9\u4e2a\u6807\u7b7e\u4e0d\u662f\u542f\u7528\u8986\u5199\u7684\u4e1c\u897f\uff0c\u5b83\u53ea\u662f\u4e00\u4e2a\u6807\u8bb0\uff0c\u63d0\u9192\u4f60\u81ea\u5df1\u5df2\u7ecf\u505a\u4e86\u8986\u5199\u3002\u6240\u4ee5\u8fd9\u5c31\u662f\u5173\u4e8e\u8fd9\u4e9b\u672f\u8bed\u7684\u5185\u5bb9\uff0c\u6211\u77e5\u9053\u8fd9\u5802\u8bfe\u6709\u70b9\u672f\u8bed\u5bc6\u96c6\uff0c\u4f46\u6709\u65f6\u5019\u5c31\u662f\u8fd9\u6837\u7684\u3002<\/p>\n\n\n\n
    8.5 interface inherutance<\/h3>\n\n\n\n
    \u5b9e\u9645\u4e0a\uff0c\u6307\u5b9a\u4e0a\u4e0b\u4f4d\u5173\u7cfb\u7684\u65b9\u6cd5\u6709\u5f88\u591a\u79cd\uff0c\u76ee\u524d\u4e3a\u6b62\u5728\u672c\u8bb2\u4e2d\u6211\u4eec\u6240\u505a\u7684\u662f\u79f0\u4e3a\u63a5\u53e3\u7ee7\u627f\uff08Interface Inheritance\uff09\u7684\u4e00\u79cd\u5173\u7cfb\u6307\u5b9a\u65b9\u5f0f\u3002\u6211\u4e2a\u4eba\u975e\u5e38\u559c\u6b22\u8fd9\u79cd\u65b9\u5f0f\uff0c\u5728\u4e0b\u4e00\u4e2a\u89c6\u9891\u4e2d\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u53e6\u4e00\u79cd\u65b9\u6cd5\u3002\u9996\u5148\uff0c\u6211\u6765\u89e3\u91ca\u4e00\u4e0b\u4ec0\u4e48\u662f\u63a5\u53e3\u7ee7\u627f\uff0c\u6240\u4ee5\u57fa\u672c\u4e0a\uff0c\u6bcf\u5f53\u6211\u4eec\u5728\u5b50\u7c7b\u4e2d\u4f7f\u7528`implements`\u5173\u952e\u5b57\u6765\u6307\u5b9a\u80fd\u529b\u65f6\uff0c\u8fd9\u88ab\u79f0\u4e3a\u63a5\u53e3\u7ee7\u627f\u3002\u4e3a\u4e86\u5206\u89e3\u8fd9\u4e2a\u672f\u8bed\uff0c\u63a5\u53e3\u5728\u8fd9\u91cc\u6307\u7684\u662f\u6240\u6709\u65b9\u6cd5\u7b7e\u540d\u7684\u5217\u8868\uff0c\u6240\u4ee5\u5982\u679c\u6211\u4eec\u67e5\u770b`List61b`\uff0c\u8fd9\u4e9b\u90fd\u662f\u5217\u8868\u53ef\u4ee5\u505a\u7684\u6240\u6709\u4e8b\u60c5\uff0c\u6211\u4eec\u4f7f\u7528\u7ee7\u627f\u8fd9\u4e2a\u8bcd\u662f\u56e0\u4e3a\u6211\u4eec\u8bf4\u5b50\u7c7b\uff0c\u4e5f\u5c31\u662f\u5728\u9876\u90e8\u58f0\u660e`implements`\u7684\u90a3\u4e2a\u7c7b\uff0c\u7ee7\u627f\u4e86\u90a3\u4e2a\u63a5\u53e3\u3002\u8fd9\u6709\u70b9\u50cf\u9501\uff08Lock\uff09\u7684\u4f8b\u5b50\uff0c\u5982\u679c\u4f60\u53bb\u4e9a\u9a6c\u900a\u641c\u7d22\u9501\uff0c\u6240\u6709\u7684\u9501\u90fd\u6709\u67d0\u4e9b\u5171\u540c\u4e4b\u5904\uff0c\u5b83\u4eec\u53ef\u4ee5\u88ab\u9501\u5b9a\u4e5f\u53ef\u4ee5\u88ab\u89e3\u9501\uff0c\u81f3\u4e8e\u5b83\u662f\u600e\u4e48\u5de5\u4f5c\u7684\u5219\u6ca1\u6709\u89c4\u5b9a\uff0c\u6709\u4e9b\u7528\u94a5\u5319\uff0c\u6709\u4e9b\u7528\u5bc6\u7801\u7ec4\u5408\uff0c\u4e0d\u7ba1\u600e\u6837\uff0c\u5173\u952e\u5728\u4e8e\u5b83\u4eec\u80fd\u9501\u80fd\u5f00\uff0c\u8fd9\u5c31\u662f\u63a5\u53e3\uff0c\u800c\u6bcf\u79cd\u4e0d\u540c\u7684\u9501\uff08\u5217\u8868\u3001SList\u3001\u6302\u9501\u3001\u5bc6\u7801\u9501\uff09\u90fd\u6709\u4e0d\u540c\u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u6240\u4ee5\u5b83\u53ea\u662f\u8bf4\u660e\u4e86\u7c7b\u80fd\u505a\u4ec0\u4e48\uff0c\u800c\u4e0d\u662f\u5177\u4f53\u600e\u4e48\u505a\u3002<\/p>\n\n\n
    \n
    \"\"<\/figure>\n<\/div>\n\n\n
    \u5728Java\u4e2d\uff0c\u81f3\u5c11\u5b50\u7c7b\u5b9e\u9645\u4e0a\u9700\u8981\u8986\u5199\u6240\u6709\u90a3\u4e9b\u65b9\u6cd5\uff0c\u6b63\u5982\u6211\u731c\u5728\u4e9a\u9a6c\u900a\u4e0a\u5982\u679c\u4f60\u60f3\u51fa\u552e\u4e00\u4e2a\u4e0d\u80fd\u9501\u4e5f\u4e0d\u80fd\u5f00\u7684\u9501\uff0c\u5b83\u5f88\u53ef\u80fd\u5f88\u5feb\u5c31\u4f1a\u88ab\u4ece\u8d27\u67b6\u4e0a\u64a4\u4e0b\u6765\u3002\u5728Java\u4e2d\uff0c\u5982\u679c\u6211\u4eec\u6709\u4e00\u4e2aAList<\/code>\u4e0d\u80fd\u505a\u4e00\u4e9b\u5b83\u5e94\u8be5\u505a\u7684\u4e8b\u60c5\uff0c\u90a3\u4e48\u5b83\u5c31\u4e0d\u4f1a\u7f16\u8bd1\u3002\u6240\u4ee5\u6362\u53e5\u8bdd\u8bf4\uff0c\u5047\u8bbe\u6211\u4eec\u53bb\u4fee\u6539List61b<\/code>\u7684\u89c4\u8303\uff0c\u589e\u52a0\u4e00\u4e2a\u540d\u4e3atrue<\/code>\u7684\u65b0\u65b9\u6cd5\uff0c\u8fd9\u662f\u5217\u8868\u9700\u8981\u80fd\u591f\u505a\u7684\u4e00\u4ef6\u65b0\u4e8b\u60c5\uff0c\u73b0\u5728\u5982\u679c\u6211\u4eec\u56de\u5230AList<\/code>\uff0c\u6b64\u65f6\u6211\u4eec\u4f1a\u53d1\u73b0\u5b83\u4e0d\u518d\u7f16\u8bd1\uff0c\u5b9e\u9645\u4e0aSList<\/code>\u4e5f\u662f\u540c\u6837\u7684\u60c5\u51b5\uff0c\u5b83\u4eec\u90fd\u65e0\u6cd5\u901a\u8fc7\u7f16\u8bd1\uff0c\u56e0\u6b64\u5982\u679c\u6539\u53d8\u89c4\u8303\uff0c\u5b83\u4eec\u5c31\u4e0d\u4f1a\u7f16\u8bd1\uff0c\u6240\u4ee5\u975e\u5e38\u91cd\u8981\u7684\u662f\uff0c\u5b50\u7c7b\u9700\u8981\u8986\u5199\u6240\u6709\u8fd9\u4e9b\u65b9\u6cd5\u3002
    \"\"<\/p>\n\n\n\n
    \u5b9e\u9645\u4e0a\uff0c\u63a5\u53e3\u7ee7\u627f\u5728\u73b0\u5b9e\u4e16\u754c\u4e2d\u53ef\u4ee5\u53d8\u5f97\u66f4\u590d\u6742\uff0c\u6211\u4eec\u53ef\u4ee5\u6709\u591a\u4ee3\u7684\u63a5\u53e3\u7ee7\u627f\uff0c\u6bcf\u4e2a\u5217\u8868\u4e5f\u662f\u4e00\u4e2a\u96c6\u5408\uff0c\u8fd9\u79cd\u60c5\u51b5\u5b9e\u9645\u4e0a\u53ef\u4ee5\u8fdb\u4e00\u6b65\u53d1\u5c55\uff0c\u6211\u4eec\u5c06\u5728\u540e\u7eed\u8bb2\u5ea7\u4e2d\u8ba8\u8bba\u8fd9\u4e00\u70b9\uff0c\u4f46\u6211\u5728\u8fd9\u91cc\u63d0\u4e00\u4e0b\uff0c\u63a5\u4e0b\u6765\u56db\u8282\u8bfe\u4e2d\u6211\u4f1a\u7ecf\u5e38\u4f7f\u7528\u8fd9\u6837\u7684\u56fe\u793a\uff0c\u63a5\u53e3\u59cb\u7ec8\u7528\u767d\u8272\u8868\u793a\uff0c\u7c7b\u7528\u7eff\u8272\u8868\u793a\uff0c\u4f46\u5fc5\u8981\u65f6\u6211\u53ef\u80fd\u4f1a\u5076\u5c14\u4f7f\u7528\u4e0d\u540c\u7684\u5b9e\u8272\u3002<\/p>\n\n\n
    \n
    \"\"<\/figure>\n<\/div>\n\n\n
     \u63a5\u53e3\u7ee7\u627f\u7684\u6982\u5ff5\u662f\u4e00\u4e2a\u6781\u5176\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u5b83\u4f7f\u4f60\u80fd\u591f\u6cdb\u5316\u4ee3\u7801\uff0c\u56e0\u4e3a\u6211\u4eec\u80fd\u591f\u7f16\u5199\u50cf`WordUtils`\u4e2d\u7684`longest`\u65b9\u6cd5\u8fd9\u6837\u7684\u4ee3\u7801\uff0c\u8fd9\u6837\u6211\u4eec\u5c31\u53ef\u4ee5\u627e\u5230`SList`\u3001`AList`\u6216\u751a\u81f3\u662f\u5c1a\u672a\u53d1\u660e\u7684\u6570\u636e\u7ed3\u6784\u4e2d\u7684\u6700\u957f\u9879\u3002\u8fd9\u5c31\u662f\u63a5\u53e3\u7ee7\u627f\u3002\u5173\u4e8e\u63a5\u53e3\u7ee7\u627f\u6709\u8da3\u7684\u4e00\u70b9\u662f\uff0c\u867d\u7136\u5b83\u5f88\u5f3a\u5927\uff0c\u4f46\u4f3c\u4e4e\u4e0e\u6211\u4eec\u4e4b\u524d\u8ba8\u8bba\u7684\u4e00\u4e9b\u6982\u5ff5\u6709\u6240\u77db\u76fe\u3002\u65e9\u5728\u7b2c3\u8bb2\u4e2d\uff0c\u6211\u4eec\u8c08\u5230\u4e86\u7b49\u53f7\u7684\u9ec4\u91d1\u6cd5\u5219\u6216\u6d77\u8c61\u4e4b\u8c1c\uff0c\u51e0\u5e74\u524d\u4e00\u4f4d\u5b66\u751f\u5411\u6211\u63d0\u51fa\u4e86\u8fd9\u4e2a\u95ee\u9898\u3002\u8fd9\u4f4d\u5b66\u751f\u8bf4\uff1a\u201c\u563f\uff0cJosh\uff0c\u4f60\u8bf4\u5f53\u4f60\u5199`x = y`\u6216\u8005\u4f20\u9012\u53c2\u6570\u65f6\uff0c\u4f60\u53ea\u662f\u590d\u5236byte\uff0c\u5176\u6b21\u4f60\u8bf4\u5185\u5b58\u76d2\u53ea\u80fd\u4fdd\u5b58\u9002\u5f53\u7c7b\u578b\u7684\u5730\u5740\uff0c\u4f8b\u5982\u4f60\u4e0d\u80fd\u8bf4`String x = new Dog()`\uff0c\u7136\u800c\u8fd9\u91cc\u6211\u4eec\u6709\u4e00\u4e2a`longest`\u65b9\u6cd5\uff0c\u5b83\u5e94\u8be5\u63a5\u6536\u5217\u8868\u5bf9\u8c61\uff0c\u4f46\u5f53\u6211\u4eec\u7528`a1`\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u65f6\uff0c`a1`\u5305\u542b\u7684\u662f\u4e00\u4e2a\u6301\u6709`AList`\u5730\u5740\u768464\u4f4d\u5185\u5b58\u76d2\uff0c\u4e0d\u77e5\u4f55\u6545\u6211\u4eec\u80fd\u591f\u590d\u5236\u8fd9\u4e9b\u6bd4\u7279\uff0c\u5c3d\u7ba1\u5b83\u4eec\u5e76\u4e0d\u662f\u5b8c\u5168\u76f8\u540c\u7684\u7c7b\u578b\u3002\u201d\u8fd9\u91cc\u7684\u8bed\u8a00\u6280\u5de7\u5728\u4e8e\uff0c\u65e0\u8bba\u4f55\u65f6\u4f60\u6307\u5b9a\u4e00\u4e2a\u7ee7\u627f\u5173\u7cfb\uff0c\u6211\u4eec\u90fd\u53ef\u4ee5\u7b80\u5355\u5730\u8bf4\uff0c\u5bf9\u4e8e\u6d89\u53ca\u5185\u5b58\u76d2\u68c0\u67e5\u7684\u6240\u6709\u76ee\u7684\u6765\u8bf4\uff0c`AList`\u5c31\u662f\u4e00\u4e2a\u5217\u8868\uff0c\u8fd9\u662f\u53ef\u4ee5\u7684\u3002\u66f4\u51c6\u786e\u7684\u8bf4\u6cd5\u53ef\u80fd\u662f\uff0c\u5982\u679cX\u662fY\u7684\u8d85\u7c7b\uff0c\u90a3\u4e48X\u7684\u5185\u5b58\u76d2\u53ef\u4ee5\u5bb9\u7eb3Y\u3002\u5982\u679c\u6211\u4eec\u60f3\u8981\u6307\u5b9a\u4e00\u4e9b\u6709\u610f\u4e49\u7684\u66ff\u4ee3\uff0c\u6211\u4eec\u53ef\u4ee5\u8bf4\uff0c\u5982\u679c\u72d7\u662f\u8d35\u5bbe\u72ac\u7684\u8d85\u7c7b\uff0c\u90a3\u4e48\u72d7\u5c4b\u53ef\u4ee5\u5bb9\u7eb3\u8d35\u5bbe\u72ac\u3002\u56e0\u6b64\uff0c\u5982\u679c\u6211\u4eec\u6709\u4e00\u4e2a\u5217\u8868\u53d8\u91cf\uff0c\u5b83\u53ef\u4ee5\u4fdd\u5b58\u5217\u8868\u7684\u5730\u5740\u3002<\/p>\n\n\n\n
    Question: http:\/\/shoutkey.com\/leash<\/p>\n\n\n\n
    Will the code below compile? If so, what happens when it runs?<\/p>\n\n\n\n
    a. Will not compile.
    b. Will compile, but will cause an error at runtime on the new line.
    c. When it runs, an SLList is created and its address is stored in the someList variable, but it crashes on someList.addFirst() since the List class doesn't implement addFirst.
    d. When it runs, an SLList is created and its address is stored in the someList variable. Then the string \"elk\" is inserted into the SLList. referred to by addFirst.<\/p>\n\n\n\n
    public static void main(String[] args) {\n    List61B<String> someList = new SLList<String>(); \n    someList.addFirst(\"elk\");\n}<\/code><\/pre>\n\n\n\n
    \u8fd9\u91cc\u6709\u4e2a\u95ee\u9898\u6765\u770b\u770b\u8fd9\u4e00\u5207\u662f\u5426\u8bf4\u5f97\u901a\uff0c\u5e76\u7ed3\u5408\u6211\u4eec\u8fc4\u4eca\u4e3a\u6b62\u8ba8\u8bba\u7684\u6240\u6709\u7ee7\u627f\u76f8\u5173\u7684\u5185\u5bb9\u3002\u5047\u8bbe\u6211\u4eec\u6709\u8fd9\u6837\u7684\u4ee3\u7801\u6bb5\uff1a`List61B someList = new SList();` \u7136\u540e\u6211\u4eec\u8bf4 `someList.addFirst(elk);` \u8fd9\u91cc\u56db\u4e2a\u573a\u666f\u4e2d\u7684\u54ea\u4e00\u4e2a\u4f1a\u53d1\u751f\uff1f\u4e00\u662f\u4ee3\u7801\u65e0\u6cd5\u7f16\u8bd1\uff0c\u4e8c\u662f\u4ee3\u7801\u7f16\u8bd1\u4f46\u5728\u8fd9\u884c\u8fd0\u884c\u65f6\u51fa\u9519\uff0c\u4e09\u662f\u8fd9\u884c\u8fd0\u884c\u826f\u597d\u4f46\u5728\u6267\u884c`addFirst`\u65f6\u5d29\u6e83\uff0c\u56e0\u4e3a\u5217\u8868\u4e0d\u77e5\u9053\u5982\u4f55\u5b9e\u73b0`addFirst`\uff0c\u56db\u662f\u6240\u6709\u4e8b\u60c5\u90fd\u8fd0\u884c\u6b63\u5e38\u3002\u8bf7\u601d\u8003\u8fd9\u4e2a\u95ee\u9898\uff0c\u7136\u540e\u6211\u4f1a\u63ed\u6653\u7b54\u6848\uff0c\u6216\u8bb8\u4f60\u53ef\u4ee5\u6682\u505c\u89c6\u9891\u7a0d\u7b49\u7247\u523b\u3002\u63ed\u6653\u7b54\u6848\uff1a\u4e00\u5207\u6b63\u5e38\uff0c\u4ee3\u7801\u7f16\u8bd1\u6ca1\u6709\u95ee\u9898\uff0c\u800c\u4e14\u8fd0\u884c\u65f6\u4e5f\u6ca1\u6709\u9519\u8bef\u3002\u6240\u4ee5\u6b63\u786e\u7b54\u6848\u662fD\uff0c\u4e00\u5207\u90fd\u8fd0\u884c\u5f97\u5f88\u597d\u3002\u5e0c\u671b\u8fd9\u5bf9\u4f60\u7406\u89e3\u63a5\u53e3\u7ee7\u627f\u6709\u6240\u5e2e\u52a9\uff0c\u5728\u4e0b\u4e00\u8282\u4e2d\u6211\u4eec\u5c06\u8ba8\u8bba\u53e6\u4e00\u79cd\u7c7b\u578b\u7684\u7ee7\u627f\uff0c\u4f46\u5728\u7ee7\u7eed\u4e4b\u524d\uff0c\u8bf7\u786e\u4fdd\u4f60\u5df2\u7ecf\u7406\u89e3\u4e86\u8fd9\u90e8\u5206\u5185\u5bb9\u3002<\/p>\n\n\n\n
    \/\/IsADemo   main()\n\npublic class IsADemo{\n    public static void main(String[] args){ \/\/args \n        List61B<String> someList new SLList<>();  \/\/someList:SLList@458\n        someList.addFirst(\"elk\");                 \/\/\u4ee5\u4e0b\u90fd\u662f\n        someList. addLast(\"dwell\"); \n        someList.addLast(\"on\"); \n        someList. addLast(\"existential\"); \n        someList. addLast(\"crises\");\n        somelist.print(); \/\/somelist: SLList@458 \n    }\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
    8.1 The Desire for Generality \u4eca\u5929\u6211\u4eec\u5c06\u4f1a\u8ba8\u8bba\u4e00\u4e2a\u5168\u65b0\u7684\u4e3b\u9898\uff0c\u79f0\u4e3a\u7ee7\u627f\u3002\u4e3a\u4e86\u94fa\u57ab\uff0c\u8ba9\u6211\u4eec\u8003\u8651\u5728\u8fc7\u53bb\u51e0 …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[2],"tags":[17,18],"class_list":["post-559","post","type-post","status-publish","format-standard","hentry","category-2","tag-17","tag-18"],"_links":{"self":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts\/559","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=559"}],"version-history":[{"count":0,"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts\/559\/revisions"}],"wp:attachment":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=559"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=559"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=559"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}