{"id":91145,"date":"2026-08-07T02:56:48","date_gmt":"2026-08-06T18:56:48","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/91145.html"},"modified":"2026-08-07T02:56:48","modified_gmt":"2026-08-06T18:56:48","slug":"%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f-10-%c2%b7-%e7%bb%84%e5%90%88%e6%a8%a1%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/91145.html","title":{"rendered":"\u8bbe\u8ba1\u6a21\u5f0f 10 \u00b7 \u7ec4\u5408\u6a21\u5f0f"},"content":{"rendered":"

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\u76ee\u5f55<\/p>\n

  • \u6811\u5f62\u7ed3\u6784\u7684\u9ebb\u70e6:\u5230\u5904\u90fd\u5728\u533a\u522b\u5bf9\u5f85<\/li>\n
  • \u7ec4\u5408\u6a21\u5f0f:\u8ba9\u5355\u4e2a\u548c\u4e00\u7ec4\u957f\u5f97\u4e00\u6837<\/li>\n
  • \u89d2\u8272\u3001\u9aa8\u67b6\u4e0e\u9012\u5f52\u4e4b\u7f8e<\/li>\n
  • \u4e00\u4e2a\u5173\u952e\u53d6\u820d:\u900f\u660e\u6a21\u5f0f vs \u5b89\u5168\u6a21\u5f0f<\/li>\n
  • \u73b0\u5b9e\u8eab\u5f71:\u6811\u7684\u5730\u65b9\u5c31\u6709\u5b83<\/li>\n
  • \u4ec0\u4e48\u65f6\u5019\u7528\u7ec4\u5408\u6a21\u5f0f<\/li>\n

    \u4e00\u3001\u6811\u5f62\u7ed3\u6784\u7684\u9ebb\u70e6:\u5230\u5904\u90fd\u5728\u533a\u522b\u5bf9\u5f85<\/h3>\n

    \u5148\u770b\u8ba2\u5355\u91cc\u7684\u5957\u9910\u7ed3\u6784\u3002\u4e00\u4e2a\u8ba2\u5355\u53ef\u80fd\u662f\u8fd9\u6837\u7684:<\/p>\n

    \u8ba2\u5355
    \n\u251c\u2500\u2500 \u5546\u54c1:\u53ef\u4e50 \u00d71 (\u5355\u4e2a\u5546\u54c1)
    \n\u251c\u2500\u2500 \u5957\u9910:\u5348\u9910\u5957\u9910 (\u5bb9\u5668,\u91cc\u9762\u8fd8\u6709\u5b50\u9879)
    \n\u2502 \u251c\u2500\u2500 \u5546\u54c1:\u6c49\u5821 \u00d71
    \n\u2502 \u251c\u2500\u2500 \u5546\u54c1:\u85af\u6761 \u00d71
    \n\u2502 \u2514\u2500\u2500 \u5957\u9910:\u996e\u6599\u7ec4\u5408 (\u5bb9\u5668\u91cc\u8fd8\u5d4c\u5957\u5bb9\u5668)
    \n\u2502 \u251c\u2500\u2500 \u5546\u54c1:\u5496\u5561 \u00d71
    \n\u2502 \u2514\u2500\u2500 \u5546\u54c1:\u751c\u70b9 \u00d71
    \n\u2514\u2500\u2500 \u5546\u54c1:\u7eb8\u5dfe \u00d71 (\u5355\u4e2a\u5546\u54c1)<\/p>\n

    \u73b0\u5728\u8981\u7b97\u8fd9\u4e2a\u8ba2\u5355\u7684\u603b\u4ef7\u3002\u5982\u679c\u4e0d\u7528\u7ec4\u5408\u6a21\u5f0f,\u4f60\u5f97\u533a\u5206"\u5355\u4e2a\u5546\u54c1"\u548c"\u5957\u9910"\u4e24\u79cd\u7c7b\u578b,\u4ee3\u7801\u5927\u6982\u957f\u8fd9\u6837:<\/p>\n

    double<\/span> calcTotal<\/span>(<\/span>List<\/span><<\/span>Object<\/span>><\/span><\/span> items)<\/span> {<\/span>
    \n double<\/span> total =<\/span> 0<\/span>;<\/span>
    \n for<\/span> (<\/span>Object<\/span> item :<\/span> items)<\/span> {<\/span>
    \n if<\/span> (<\/span>item instanceof<\/span> Product<\/span>)<\/span> {<\/span> \/\/ \u5982\u679c\u662f\u5355\u4e2a\u5546\u54c1<\/span>
    \n total +=<\/span> (<\/span>(<\/span>Product<\/span>)<\/span> item)<\/span>.<\/span>getPrice<\/span>(<\/span>)<\/span>;<\/span>
    \n }<\/span> else<\/span> if<\/span> (<\/span>item instanceof<\/span> ComboPackage<\/span>)<\/span> {<\/span> \/\/ \u5982\u679c\u662f\u5957\u9910<\/span>
    \n \/\/ \u5f97\u624b\u52a8\u9012\u5f52\u8fdb\u53bb,\u628a\u5957\u9910\u91cc\u7684\u5b50\u9879\u518d\u7b97\u4e00\u904d<\/span>
    \n total +=<\/span> calcTotal<\/span>(<\/span>(<\/span>(<\/span>ComboPackage<\/span>)<\/span> item)<\/span>.<\/span>getChildren<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n return<\/span> total;<\/span>
    \n}<\/span><\/p>\n

    \u8fd9\u6bb5\u4ee3\u7801\u7684\u95ee\u9898\u5f88\u5178\u578b:\u8c03\u7528\u65b9\u88ab\u8feb\u77e5\u9053"\u5143\u7d20\u6709\u4e24\u79cd\u7c7b\u578b",\u5e76\u4e3a\u6bcf\u79cd\u5199\u4e0d\u540c\u7684\u5904\u7406\u903b\u8f91(instanceof + \u5206\u652f)\u3002\u4e0d\u5149\u662f\u7b97\u603b\u4ef7,\u5c55\u793a\u8ba2\u5355\u3001\u7edf\u8ba1\u5546\u54c1\u6570\u3001\u5bfc\u51fa\u6e05\u5355\u2026\u2026\u6bcf\u4e00\u4e2a\u64cd\u4f5c\u90fd\u5f97\u91cd\u590d\u8fd9\u5957"\u5224\u65ad\u7c7b\u578b + \u5206\u522b\u5904\u7406 + \u624b\u52a8\u9012\u5f52"\u7684\u6a21\u677f\u3002\u4e00\u65e6\u4ee5\u540e\u53c8\u591a\u51fa\u4e00\u79cd\u5bb9\u5668\u7c7b\u578b(\u6bd4\u5982"\u793c\u5305"),\u6240\u6709\u8fd9\u4e9b\u5730\u65b9\u90fd\u5f97\u52a0\u5206\u652f\u3002\u8fd9\u8fdd\u53cd\u4e86\u5f00\u95ed\u539f\u5219,\u4e5f\u8ba9\u4ee3\u7801\u5145\u6ee1\u4e86\u6613\u9519\u7684\u7c7b\u578b\u5224\u65ad\u3002<\/p>\n

    \u95ee\u9898\u7684\u6839\u6e90\u5728\u4e8e:\u5728\u8c03\u7528\u65b9\u773c\u91cc,"\u5355\u4e2a\u5546\u54c1"\u548c"\u5957\u9910"\u662f\u4e24\u79cd\u4e0d\u540c\u7684\u4e1c\u897f,\u5f97\u533a\u522b\u5bf9\u5f85\u3002 \u53ef\u5982\u679c\u6211\u4eec\u9000\u4e00\u6b65\u60f3\u2014\u2014\u4e0d\u7ba1\u662f\u5355\u4e2a\u5546\u54c1\u8fd8\u662f\u5957\u9910,\u5b83\u4eec\u5bf9\u5916\u90fd\u5e94\u8be5\u80fd\u56de\u7b54\u540c\u4e00\u4e2a\u95ee\u9898:\u201c\u4f60\u591a\u5c11\u94b1?\u201d\u3002\u5355\u4e2a\u5546\u54c1\u56de\u7b54\u81ea\u5df1\u7684\u4ef7;\u5957\u9910\u56de\u7b54"\u6211\u6240\u6709\u5b50\u9879\u52a0\u8d77\u6765\u7684\u4ef7"\u3002\u5982\u679c\u5b83\u4eec\u80fd\u7528\u540c\u4e00\u4e2a\u65b9\u6cd5\u56de\u7b54,\u8c03\u7528\u65b9\u4e0d\u5c31\u4e0d\u7528\u533a\u5206\u4e86\u5417? \u8fd9\u6b63\u662f\u7ec4\u5408\u6a21\u5f0f\u7684\u7a81\u7834\u53e3\u3002<\/p>\n<\/p>\n

    \u4e8c\u3001\u7ec4\u5408\u6a21\u5f0f:\u8ba9\u5355\u4e2a\u548c\u4e00\u7ec4\u957f\u5f97\u4e00\u6837<\/h3>\n

    \u7ec4\u5408\u6a21\u5f0f\u7684\u6838\u5fc3\u601d\u60f3:\u8ba9"\u5355\u4e2a\u5143\u7d20(\u53f6\u5b50)"\u548c"\u5bb9\u5668(\u7ec4\u5408)"\u5b9e\u73b0\u540c\u4e00\u4e2a\u63a5\u53e3,\u4ece\u800c\u8ba9\u8c03\u7528\u65b9\u53ef\u4ee5\u7528\u4e00\u81f4\u7684\u65b9\u5f0f\u5bf9\u5f85\u5b83\u4eec\u3002 \u5bb9\u5668\u5728\u5b9e\u73b0\u63a5\u53e3\u65b9\u6cd5\u65f6,\u628a\u8bf7\u6c42"\u8f6c\u53d1"\u7ed9\u5b83\u7684\u6240\u6709\u5b50\u5143\u7d20\u2014\u2014\u800c\u5b50\u5143\u7d20\u53ef\u80fd\u53c8\u662f\u53f6\u5b50\u6216\u5bb9\u5668,\u4e8e\u662f\u5929\u7136\u5f62\u6210\u9012\u5f52\u3002<\/p>\n

    \u7b2c\u4e00\u6b65,\u5b9a\u4e49\u4e00\u4e2a\u6240\u6709\u5143\u7d20\u5171\u540c\u7684\u62bd\u8c61\u63a5\u53e3(\u53eb"\u7ec4\u4ef6"):<\/p>\n

    \/\/ \u7ec4\u4ef6:\u53f6\u5b50\u548c\u5bb9\u5668\u5171\u540c\u7684\u63a5\u53e3<\/span>
    \npublic<\/span> interface<\/span> OrderComponent<\/span> {<\/span>
    \n double<\/span> getPrice<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u4e0d\u7ba1\u4f60\u662f\u5546\u54c1\u8fd8\u662f\u5957\u9910,\u90fd\u5f97\u80fd\u56de\u7b54"\u591a\u5c11\u94b1"<\/span>
    \n void<\/span> print<\/span>(<\/span>String<\/span> indent)<\/span>;<\/span> \/\/ \u4e5f\u90fd\u80fd\u6253\u5370\u81ea\u5df1<\/span>
    \n}<\/span><\/p>\n

    \u7b2c\u4e8c\u6b65,\u53f6\u5b50\u8282\u70b9(\u5355\u4e2a\u5546\u54c1)\u2014\u2014\u5b83\u6ca1\u6709\u5b50\u5143\u7d20,\u76f4\u63a5\u8fd4\u56de\u81ea\u5df1\u7684\u6570\u636e:<\/p>\n

    public<\/span> class<\/span> Product<\/span> implements<\/span> OrderComponent<\/span> {<\/span>
    \n private<\/span> final<\/span> String<\/span> name;<\/span>
    \n private<\/span> final<\/span> double<\/span> price;<\/span>
    \n public<\/span> Product<\/span>(<\/span>String<\/span> name,<\/span> double<\/span> price)<\/span> {<\/span> this<\/span>.<\/span>name =<\/span> name;<\/span> this<\/span>.<\/span>price =<\/span> price;<\/span> }<\/span><\/p>\n

    public<\/span> double<\/span> getPrice<\/span>(<\/span>)<\/span> {<\/span> return<\/span> price;<\/span> }<\/span> \/\/ \u53f6\u5b50:\u8fd4\u56de\u81ea\u5df1\u7684\u4ef7<\/span>
    \n public<\/span> void<\/span> print<\/span>(<\/span>String<\/span> indent)<\/span> {<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>indent +<\/span> "\u5546\u54c1:"<\/span> +<\/span> name +<\/span> " \u00a5"<\/span> +<\/span> price)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \u7b2c\u4e09\u6b65,\u5bb9\u5668\u8282\u70b9(\u5957\u9910)\u2014\u2014\u5b83\u6301\u6709\u4e00\u6279\u5b50\u5143\u7d20,\u628a\u8bf7\u6c42\u8f6c\u53d1\u7ed9\u6bcf\u4e2a\u5b50\u5143\u7d20\u518d\u6c47\u603b:<\/p>\n

    public<\/span> class<\/span> ComboPackage<\/span> implements<\/span> OrderComponent<\/span> {<\/span>
    \n private<\/span> final<\/span> String<\/span> name;<\/span>
    \n private<\/span> final<\/span> List<\/span><<\/span>OrderComponent<\/span>><\/span><\/span> children =<\/span> new<\/span> ArrayList<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span> \/\/ \u5b50\u5143\u7d20<\/span><\/p>\n

    public<\/span> ComboPackage<\/span>(<\/span>String<\/span> name)<\/span> {<\/span> this<\/span>.<\/span>name =<\/span> name;<\/span> }<\/span>
    \n public<\/span> void<\/span> add<\/span>(<\/span>OrderComponent<\/span> child)<\/span> {<\/span> children.<\/span>add<\/span>(<\/span>child)<\/span>;<\/span> }<\/span> \/\/ \u5f80\u5bb9\u5668\u91cc\u52a0<\/span><\/p>\n

    public<\/span> double<\/span> getPrice<\/span>(<\/span>)<\/span> {<\/span>
    \n double<\/span> total =<\/span> 0<\/span>;<\/span>
    \n for<\/span> (<\/span>OrderComponent<\/span> child :<\/span> children)<\/span> {<\/span>
    \n total +=<\/span> child.<\/span>getPrice<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u8f6c\u53d1\u7ed9\u6bcf\u4e2a\u5b50\u5143\u7d20,\u5b50\u5143\u7d20\u81ea\u5df1\u4f1a\u7b97<\/span>
    \n }<\/span>
    \n return<\/span> total;<\/span> \/\/ \u9012\u5f52\u7684\u5173\u952e:\u4e0d\u5173\u5fc3 child \u662f\u53f6\u5b50\u8fd8\u662f\u5bb9\u5668<\/span>
    \n }<\/span>
    \n public<\/span> void<\/span> print<\/span>(<\/span>String<\/span> indent)<\/span> {<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>indent +<\/span> "\u5957\u9910:"<\/span> +<\/span> name)<\/span>;<\/span>
    \n for<\/span> (<\/span>OrderComponent<\/span> child :<\/span> children)<\/span> {<\/span>
    \n child.<\/span>print<\/span>(<\/span>indent +<\/span> " "<\/span>)<\/span>;<\/span> \/\/ \u540c\u6837\u5730\u8f6c\u53d1<\/span>
    \n }<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \u770b ComboPackage.getPrice() \u91cc\u90a3\u884c child.getPrice()\u2014\u2014\u5b83\u538b\u6839\u4e0d\u68c0\u67e5 child \u662f\u5546\u54c1\u8fd8\u662f\u5957\u9910,\u76f4\u63a5\u8c03 getPrice() \u5c31\u5b8c\u4e86\u3002\u5982\u679c child \u662f\u5546\u54c1,\u8fd4\u56de\u5546\u54c1\u4ef7;\u5982\u679c\u662f\u5957\u9910,\u5957\u9910\u81ea\u5df1\u53c8\u4f1a\u53bb\u904d\u5386\u5b83\u7684\u5b50\u9879\u2026\u2026\u9012\u5f52\u5c31\u8fd9\u4e48\u81ea\u7136\u5730\u53d1\u751f\u4e86,\u800c\u4ee3\u7801\u91cc\u6ca1\u6709\u4e00\u4e2a instanceof\u3002<\/p>\n

    \u73b0\u5728\u7528\u8d77\u6765,\u6784\u5efa\u548c\u8ba1\u7b97\u90fd\u6e05\u723d\u4e86:<\/p>\n

    ComboPackage<\/span> lunch =<\/span> new<\/span> ComboPackage<\/span>(<\/span>"\u5348\u9910\u5957\u9910"<\/span>)<\/span>;<\/span>
    \nlunch.<\/span>add<\/span>(<\/span>new<\/span> Product<\/span>(<\/span>"\u6c49\u5821"<\/span>,<\/span> 20<\/span>)<\/span>)<\/span>;<\/span>
    \nlunch.<\/span>add<\/span>(<\/span>new<\/span> Product<\/span>(<\/span>"\u85af\u6761"<\/span>,<\/span> 10<\/span>)<\/span>)<\/span>;<\/span>
    \nComboPackage<\/span> drinks =<\/span> new<\/span> ComboPackage<\/span>(<\/span>"\u996e\u6599\u7ec4\u5408"<\/span>)<\/span>;<\/span>
    \ndrinks.<\/span>add<\/span>(<\/span>new<\/span> Product<\/span>(<\/span>"\u5496\u5561"<\/span>,<\/span> 15<\/span>)<\/span>)<\/span>;<\/span>
    \nlunch.<\/span>add<\/span>(<\/span>drinks)<\/span>;<\/span> \/\/ \u5957\u9910\u91cc\u5d4c\u5957\u5957\u9910,\u6ca1\u95ee\u9898<\/span><\/p>\n

    \/\/ \u5173\u952e:\u7b97\u603b\u4ef7\u65f6,\u5b8c\u5168\u4e0d\u533a\u5206\u5b83\u662f\u5546\u54c1\u8fd8\u662f\u5957\u9910<\/span>
    \nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>lunch.<\/span>getPrice<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ 45,\u5185\u90e8\u9012\u5f52\u81ea\u52a8\u7b97\u597d<\/span><\/p>\n

    \u5bf9\u6bd4\u7b2c\u4e00\u8282,\u5347\u7ea7\u70b9\u975e\u5e38\u6e05\u6670:\u8c03\u7528\u65b9\u4e0d\u518d\u9700\u8981 instanceof \u548c\u5206\u652f\u5224\u65ad,\u9762\u5bf9\u4efb\u4f55\u4e00\u4e2a OrderComponent,\u76f4\u63a5\u8c03 getPrice() \u5c31\u884c\u3002 "\u5355\u4e2a"\u548c"\u4e00\u7ec4"\u5728\u8c03\u7528\u65b9\u773c\u91cc\u957f\u5f97\u4e00\u6a21\u4e00\u6837\u4e86\u2014\u2014\u8fd9\u5c31\u662f\u7ec4\u5408\u6a21\u5f0f\u6700\u6838\u5fc3\u7684\u4ef7\u503c\u3002<\/p>\n<\/p>\n

    \u4e09\u3001\u89d2\u8272\u3001\u9aa8\u67b6\u4e0e\u9012\u5f52\u4e4b\u7f8e<\/h3>\n

    \u7ec4\u5408\u6a21\u5f0f\u6709\u4e09\u4e2a\u89d2\u8272:<\/p>\n\n\u89d2\u8272\u672c\u4f8b\u4e2d\u662f\u8c01\u804c\u8d23<\/tr>\n\n\n\n\n
    \u62bd\u8c61\u7ec4\u4ef6(Component)<\/td>\nOrderComponent \u63a5\u53e3<\/td>\n\u53f6\u5b50\u548c\u5bb9\u5668\u7684\u5171\u540c\u63a5\u53e3<\/td>\n<\/tr>\n
    \u53f6\u5b50(Leaf)<\/td>\nProduct<\/td>\n\u6ca1\u6709\u5b50\u8282\u70b9\u7684\u7ec8\u7aef\u5143\u7d20<\/td>\n<\/tr>\n
    \u5bb9\u5668\/\u7ec4\u5408(Composite)<\/td>\nComboPackage<\/td>\n\u6301\u6709\u5b50\u7ec4\u4ef6,\u628a\u64cd\u4f5c\u8f6c\u53d1\u7ed9\u5b50\u7ec4\u4ef6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u7528\u4e00\u5f20\u6811\u5f62\u56fe\u770b\u8fd9\u4e2a\u7ed3\u6784\u6700\u76f4\u89c2:<\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \u56fe\u91cc\u6700\u503c\u5f97\u4f53\u4f1a\u7684\u662f\u90a3\u6761\u4ece\u5bb9\u5668\u6307\u56de\u62bd\u8c61\u7ec4\u4ef6\u7684\u5f15\u7528(\u5bb9\u5668\u6301\u6709\u7684\u662f List<OrderComponent>,\u800c\u4e0d\u662f List<Product>)\u3002\u6b63\u662f\u8fd9\u4e2a"\u5bb9\u5668\u6301\u6709\u7684\u662f\u62bd\u8c61\u7ec4\u4ef6"\u7684\u8bbe\u8ba1,\u8ba9\u5bb9\u5668\u65e2\u80fd\u88c5\u53f6\u5b50\u3001\u4e5f\u80fd\u88c5\u5bb9\u5668,\u4ece\u800c\u652f\u6301\u4efb\u610f\u6df1\u5ea6\u7684\u5d4c\u5957\u3002\u800c\u6240\u6709\u64cd\u4f5c(\u7b97\u4ef7\u3001\u6253\u5370\u3001\u7edf\u8ba1)\u90fd\u53d8\u6210\u4e86\u5bf9\u8fd9\u68f5\u6811\u7684\u9012\u5f52\u904d\u5386:\u9047\u5230\u53f6\u5b50\u5c31\u76f4\u63a5\u5904\u7406,\u9047\u5230\u5bb9\u5668\u5c31\u8f6c\u53d1\u7ed9\u5b83\u7684\u5b69\u5b50\u2014\u2014\u9012\u5f52\u7684\u7ec8\u6b62\u6761\u4ef6(\u53f6\u5b50)\u548c\u9012\u5f52\u6b65\u9aa4(\u5bb9\u5668\u8f6c\u53d1)\u88ab\u4f18\u96c5\u5730\u5206\u6d3e\u7ed9\u4e86\u4e24\u4e2a\u4e0d\u540c\u7684\u7c7b,\u4f60\u751a\u81f3\u4e0d\u7528\u81ea\u5df1\u5199 if \u6765\u63a7\u5236\u9012\u5f52,\u7c7b\u578b\u7cfb\u7edf\u5e2e\u4f60\u641e\u5b9a\u4e86\u3002\u8fd9\u5c31\u662f\u7ec4\u5408\u6a21\u5f0f\u7684"\u9012\u5f52\u4e4b\u7f8e":\u628a\u4e00\u4e2a\u590d\u6742\u7684\u6811\u5f62\u9012\u5f52,\u62c6\u89e3\u6210\u6bcf\u4e2a\u8282\u70b9\u5404\u81ea\u7b80\u5355\u7684\u3001\u5c40\u90e8\u7684\u884c\u4e3a\u3002<\/p>\n<\/p>\n

    \u56db\u3001\u4e00\u4e2a\u5173\u952e\u53d6\u820d:\u900f\u660e\u6a21\u5f0f vs \u5b89\u5168\u6a21\u5f0f<\/h3>\n

    \u7ec4\u5408\u6a21\u5f0f\u6709\u4e00\u4e2a\u5fc5\u987b\u8bb2\u6e05\u695a\u7684\u8bbe\u8ba1\u53d6\u820d,\u5173\u4e8e"\u7ba1\u7406\u5b50\u8282\u70b9\u7684\u65b9\u6cd5(add\u3001remove)\u8be5\u653e\u5728\u54ea"\u3002<\/p>\n

    \u770b\u4e2a\u77db\u76fe:add(child)\u3001remove(child) \u8fd9\u4e9b\u7ba1\u7406\u5b50\u8282\u70b9\u7684\u65b9\u6cd5,\u53ea\u6709\u5bb9\u5668\u624d\u9700\u8981\u2014\u2014\u53f6\u5b50\u662f\u6ca1\u6709\u5b50\u8282\u70b9\u7684,\u7ed9\u4e00\u4e2a\u5546\u54c1\u8c03 add \u6beb\u65e0\u610f\u4e49\u3002\u90a3\u8fd9\u4e9b\u65b9\u6cd5,\u5e94\u8be5\u5b9a\u4e49\u5728\u62bd\u8c61\u7ec4\u4ef6\u63a5\u53e3\u91cc,\u8fd8\u662f\u53ea\u5b9a\u4e49\u5728\u5bb9\u5668\u7c7b\u91cc?\u4e24\u79cd\u9009\u62e9,\u5404\u6709\u5229\u5f0a,\u5206\u522b\u53eb"\u900f\u660e\u6a21\u5f0f"\u548c"\u5b89\u5168\u6a21\u5f0f":<\/p>\n

    \u900f\u660e\u6a21\u5f0f:\u628a add\/remove \u4e5f\u653e\u8fdb\u62bd\u8c61\u7ec4\u4ef6\u63a5\u53e3 OrderComponent\u3002<\/p>\n

      \n
    • \u597d\u5904:\u53f6\u5b50\u548c\u5bb9\u5668\u63a5\u53e3\u5b8c\u5168\u4e00\u81f4,\u8c03\u7528\u65b9\u62ff\u5230\u4efb\u4f55\u7ec4\u4ef6\u90fd\u80fd\u4e00\u89c6\u540c\u4ec1,\u771f\u6b63\u505a\u5230"\u900f\u660e"\u2014\u2014\u8fd9\u4e5f\u662f GoF \u539f\u4e66\u63a8\u8350\u7684\u65b9\u5f0f\u3002<\/li>\n
    • \u4ee3\u4ef7:\u53f6\u5b50(Product)\u88ab\u8feb\u4e5f\u5b9e\u73b0\u4e86 add\/remove,\u4f46\u5b83\u5176\u5b9e\u4e0d\u652f\u6301,\u53ea\u80fd\u7a7a\u5b9e\u73b0\u6216\u629b\u5f02\u5e38\u3002\u8fd9\u5c31\u628a"\u4e0d\u652f\u6301"\u7684\u95ee\u9898\u4ece\u7f16\u8bd1\u671f\u63a8\u8fdf\u5230\u4e86\u8fd0\u884c\u65f6\u2014\u2014\u4f60\u7ed9\u4e00\u4e2a\u5546\u54c1\u8c03 add,\u7f16\u8bd1\u4e0d\u62a5\u9519,\u8fd0\u884c\u65f6\u624d\u629b UnsupportedOperationException\u3002\u8fd9\u5176\u5b9e\u8fdd\u53cd\u4e86\u91cc\u6c0f\u66ff\u6362(\u7b2c\u4e00\u7bc7\u8bb2\u8fc7\u7684:\u5b50\u7c7b\u4e0d\u8be5\u629b\u7236\u7c7b\u4e0d\u629b\u7684\u5f02\u5e38)\u3002<\/li>\n<\/ul>\n

      \u5b89\u5168\u6a21\u5f0f:add\/remove \u53ea\u5b9a\u4e49\u5728\u5bb9\u5668\u7c7b ComboPackage \u91cc,\u62bd\u8c61\u7ec4\u4ef6\u63a5\u53e3\u4fdd\u6301\u5e72\u51c0\u3002<\/p>\n

        \n
      • \u597d\u5904:\u7c7b\u578b\u5b89\u5168,\u53f6\u5b50\u6839\u672c\u6ca1\u6709 add \u65b9\u6cd5,\u4f60\u5728\u7f16\u8bd1\u671f\u5c31\u4e0d\u53ef\u80fd\u5bf9\u53f6\u5b50\u8bef\u8c03\u7528\u3002<\/li>\n
      • \u4ee3\u4ef7:\u53f6\u5b50\u548c\u5bb9\u5668\u63a5\u53e3\u4e0d\u4e00\u81f4\u4e86,\u8c03\u7528\u65b9\u60f3\u8c03 add \u65f6,\u5fc5\u987b\u5148\u5224\u65ad"\u8fd9\u662f\u4e0d\u662f\u5bb9\u5668"\u3001\u5e76\u5411\u4e0b\u8f6c\u578b\u6210 ComboPackage\u2014\u2014\u53c8\u56de\u5230\u4e86 instanceof \u7684\u8001\u8def,\u5931\u53bb\u4e86\u90e8\u5206"\u900f\u660e"\u3002<\/li>\n<\/ul>\n

        \u600e\u4e48\u9009?\u8fd9\u662f"\u900f\u660e\u6027"\u548c"\u7c7b\u578b\u5b89\u5168"\u4e4b\u95f4\u7684\u6743\u8861,\u6ca1\u6709\u7edd\u5bf9\u7b54\u6848:<\/p>\n

          \n
        • \u5982\u679c\u4f60\u66f4\u770b\u91cd"\u8c03\u7528\u65b9\u5b8c\u5168\u4e0d\u533a\u5206\u53f6\u5b50\u548c\u5bb9\u5668"\u7684\u6781\u81f4\u900f\u660e(\u6bd4\u5982\u505a\u4e00\u4e2a\u901a\u7528\u7684\u6811\u904d\u5386\u6846\u67b6),\u9009\u900f\u660e\u6a21\u5f0f,\u63a5\u53d7\u53f6\u5b50\u90a3\u51e0\u4e2a\u7a7a\u5b9e\u73b0;<\/li>\n
        • \u5982\u679c\u4f60\u66f4\u770b\u91cd\u7f16\u8bd1\u671f\u7684\u7c7b\u578b\u5b89\u5168\u3001\u4e0d\u5e0c\u671b\u51fa\u73b0"\u5bf9\u53f6\u5b50\u8c03 add"\u7684\u8fd0\u884c\u65f6\u9519\u8bef,\u9009\u5b89\u5168\u6a21\u5f0f,\u63a5\u53d7\u8c03\u7528\u65b9\u5076\u5c14\u8981\u505a\u7c7b\u578b\u5224\u65ad\u3002<\/li>\n<\/ul>\n

          \u5b9e\u9645\u9879\u76ee\u91cc,\u900f\u660e\u6a21\u5f0f\u7528\u5f97\u66f4\u591a,\u56e0\u4e3a\u7ec4\u5408\u6a21\u5f0f\u7684\u5168\u90e8\u610f\u4e49\u5c31\u662f"\u7edf\u4e00\u5bf9\u5f85",\u5b89\u5168\u6a21\u5f0f\u7684\u7c7b\u578b\u5224\u65ad\u67d0\u79cd\u7a0b\u5ea6\u4e0a\u524a\u5f31\u4e86\u8fd9\u4e2a\u521d\u8877\u3002\u4f46\u8981\u6e05\u695a\u5b83\u7684\u4ee3\u4ef7,\u5e76\u5728\u53f6\u5b50\u7684\u7a7a\u5b9e\u73b0\u91cc\u7ed9\u51fa\u6e05\u6670\u7684\u5f02\u5e38\u4fe1\u606f\u3002\u7406\u89e3\u8fd9\u4e2a\u53d6\u820d,\u6bd4\u8bb0\u4f4f\u54ea\u4e2a"\u66f4\u597d"\u66f4\u91cd\u8981\u2014\u2014\u5b83\u518d\u6b21\u8bf4\u660e:\u6a21\u5f0f\u4e0d\u662f\u6b7b\u677f\u7684\u6559\u6761,\u800c\u662f\u4e00\u7ec4\u9700\u8981\u4f60\u6839\u636e\u573a\u666f\u6743\u8861\u7684\u9009\u62e9\u3002<\/p>\n<\/p>\n

          \u4e94\u3001\u73b0\u5b9e\u8eab\u5f71:\u6811\u7684\u5730\u65b9\u5c31\u6709\u5b83<\/h3>\n

          \u7ec4\u5408\u6a21\u5f0f\u5728\u6807\u51c6\u5e93\u548c\u6846\u67b6\u91cc,\u51e1\u662f\u6709"\u6811"\u7684\u5730\u65b9\u51e0\u4e4e\u90fd\u6709\u5b83:<\/p>\n

            \n
          • java.awt \/ Swing \u7684 UI \u7ec4\u4ef6\u6811:Component \u662f\u62bd\u8c61\u7ec4\u4ef6,Button\u3001Label \u662f\u53f6\u5b50,Container(\u5982 Panel\u3001Frame)\u662f\u5bb9\u5668,\u5bb9\u5668\u91cc\u80fd\u653e\u7ec4\u4ef6\u4e5f\u80fd\u653e\u5bb9\u5668\u3002\u4f60\u8c03 container.paint(),\u5b83\u4f1a\u9012\u5f52\u5730\u628a\u81ea\u5df1\u548c\u6240\u6709\u5b50\u7ec4\u4ef6\u90fd\u753b\u51fa\u6765\u2014\u2014\u6807\u51c6\u7684\u7ec4\u5408\u6a21\u5f0f\u3002<\/li>\n
          • XML\/HTML \u7684 DOM \u6811:Node \u662f\u62bd\u8c61\u7ec4\u4ef6,\u6587\u672c\u8282\u70b9\u662f\u53f6\u5b50,\u5143\u7d20\u8282\u70b9\u662f\u5bb9\u5668,\u5c42\u5c42\u5d4c\u5957\u6784\u6210\u6587\u6863\u6811\u3002<\/li>\n
          • \u6587\u4ef6\u7cfb\u7edf\u62bd\u8c61:File \u65e2\u53ef\u4ee5\u4ee3\u8868\u6587\u4ef6(\u53f6\u5b50),\u4e5f\u53ef\u4ee5\u4ee3\u8868\u76ee\u5f55(\u5bb9\u5668),listFiles() \u9012\u5f52\u904d\u5386\u2014\u2014\u867d\u7136 Java \u7684 java.io.File \u6ca1\u6709\u4e25\u683c\u6309\u7ec4\u5408\u6a21\u5f0f\u8bbe\u8ba1,\u4f46\u601d\u60f3\u4e00\u81f4\u3002<\/li>\n
          • \u5404\u7c7b\u83dc\u5355\u6811\u3001\u6743\u9650\u6811\u3001\u7ec4\u7ec7\u67b6\u6784\u6811\u3001\u8bc4\u8bba\u5d4c\u5957\u56de\u590d:\u4e1a\u52a1\u7cfb\u7edf\u91cc\u51e1\u662f"\u53ef\u65e0\u9650\u5d4c\u5957\u7684\u5c42\u7ea7\u7ed3\u6784",\u7ec4\u5408\u6a21\u5f0f\u90fd\u662f\u6807\u51c6\u89e3\u6cd5\u3002<\/li>\n<\/ul>\n

            \u4e00\u4e2a\u8bc6\u522b\u4fe1\u53f7:\u53ea\u8981\u4f60\u770b\u5230"XX \u91cc\u53ef\u4ee5\u5305\u542b XX,\u4e14\u80fd\u65e0\u9650\u5957\u4e0b\u53bb",\u5e76\u4e14\u5e0c\u671b\u5bf9\u5355\u4e2a\u548c\u4e00\u7ec4\u7528\u7edf\u4e00\u65b9\u5f0f\u5904\u7406,\u90a3\u5c31\u662f\u7ec4\u5408\u6a21\u5f0f\u7684\u4e3b\u573a\u3002<\/p>\n<\/p>\n

            \u516d\u3001\u4ec0\u4e48\u65f6\u5019\u7528\u7ec4\u5408\u6a21\u5f0f<\/h3>\n

            \u8001\u89c4\u77e9,\u6cfc\u51b7\u6c34\u3002\u7ec4\u5408\u6a21\u5f0f\u5f88\u4f18\u96c5,\u4f46\u5b83\u6709\u660e\u786e\u7684\u9002\u7528\u524d\u63d0\u3002<\/p>\n

            \u9002\u5408\u7528\u7684\u4fe1\u53f7:<\/p>\n

              \n
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