{"id":31716,"date":"2022-11-23T11:13:27","date_gmt":"2023-04-09T10:31:40","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%e4%bd%bf%e7%94%a8%e8%bf%ad%e4%bb%a3%e5%99%a8%e6%a8%a1%e5%bc%8f\/"},"modified":"2024-04-29T02:06:53","modified_gmt":"2024-04-28T18:06:53","slug":"%e5%9c%a8java%e4%b8%ad%e4%bd%bf%e7%94%a8%e8%bf%ad%e4%bb%a3%e5%99%a8%e6%a8%a1%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%e4%bd%bf%e7%94%a8%e8%bf%ad%e4%bb%a3%e5%99%a8%e6%a8%a1%e5%bc%8f\/","title":{"rendered":"\u5728Java\u4e2d\u4f7f\u7528\u8fed\u4ee3\u5668\u6a21\u5f0f"},"content":{"rendered":"

\u9996\u5148<\/h1>\n

\u6211\u6253\u7b97\u8bfb\u4e00\u672c\u4ecb\u7ecdGoF\u8bbe\u8ba1\u6a21\u5f0f\u7684\u300aJava\u8bed\u8a00\u5b66\u4e60\u8bbe\u8ba1\u6a21\u5f0f\u5165\u95e8\u589e\u8865\u6539\u8ba2\u7248\u300b\uff0c\u5e76\u603b\u7ed3\u6240\u5b66\u5185\u5bb9\u3002<\/p>\n

\u8fed\u4ee3\u5668\u6a21\u5f0f<\/h1>\n

\u8fed\u4ee3\u5668\u662f\u4ec0\u4e48\uff1f<\/h2>\n

\u8fed\u4ee3\u5668\u662f\u82f1\u6587\u4e2d\u7684\u4e00\u4e2a\u8bcd\uff0c\u610f\u601d\u662f\u300c\u53cd\u590d\u8005\u300d\u3002\u7279\u522b\u662f\u5728\u7f16\u7a0b\u4e2d\uff0c\u5b83\u6307\u7684\u662f\u5c06\u5bf9\u96c6\u5408\u4f53\u987a\u5e8f\u8bbf\u95ee\u65f6\u7684\u300c\u6307\u5f15\u7269\u300d\u62bd\u8c61\u5316\u548c\u6cdb\u5316\u7684\u5185\u5bb9\u3002\u4ec5\u4ec5\u51ed\u8fd9\u4e2a\u63cf\u8ff0\uff0c\u6211\u89c9\u5f97\u5f88\u96be\u5f62\u8c61\u5316\uff0c\u6240\u4ee5\u6211\u518d\u4e3e\u4e2a\u66f4\u5177\u4f53\u7684\u4f8b\u5b50\u3002\u5bf9\u4e8e\u90a3\u4e9b\u5199\u8fc7\u50cf\u4e0b\u9762\u8fd9\u6837\u7684\u5faa\u73af\u8bed\u53e5\uff0c\u4ee5\u663e\u793a\u6570\u7ec4array\u4e2d\u6240\u6709\u5143\u7d20\u7684\u4eba\u6765\u8bf4\uff0c\u5e94\u8be5\u5f88\u591a\u5427\u3002<\/p>\n

for<\/span> (<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> array<\/span>.<\/span>length<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n  System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>array<\/span>[<\/span>i<\/span>]);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5728\u8fd9\u91cc\uff0c\u53d8\u91cfi\u4f5c\u4e3a\u6570\u7ec4array\u7684\u7d22\u5f15\uff0c\u4f9d\u6b21\u8bbf\u95ee\u6570\u7ec4\u7684\u5143\u7d20\u3002
\n\u50cf\u8fd9\u6837\u201c\u5faa\u73af\u5e76\u6307\u5411\u6574\u4e2a\u6570\u7ec4\uff0c\u8fdb\u884c\u904d\u5386\u201d\u7684\u6982\u5ff5\u5c31\u662f\u8fed\u4ee3\u5668\u3002<\/p>\n
\u89d2\u8272<\/h2>\n
\"image.png\"<\/div>\n
\u754c\u9762 (ji\u00e8<\/h3>\n
Aggreate
\n\u6570\u3048\u4e0a\u3052\u3092\u884c\u3046\u5bfe\u8c61\u306e\u300c\u96c6\u5408\u4f53\u300d\u3092\u8868\u3057\u307e\u3059\u3002
\n\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u306fIterator()\u306e\u307f\u3092\u6301\u3061\u307e\u3059\u3002
\n\u3053\u308c\u306fIterator\u751f\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
public<\/span> interface<\/span> Aggregate<\/span> {<\/span>\r\n    public<\/span> abstract<\/span> Iterator<\/span> iterator<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Iterator
\n\u96c6\u5408\u306e\u8981\u7d20\u306e\u300c\u6570\u3048\u4e0a\u3052\u3092\u884c\u3046\u3082\u306e\u300d\u3092\u8868\u3057\u307e\u3059\u3002
\n\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u306fhasNext()\u3068next()\u306e2\u3064\u3092\u6301\u3061\u307e\u3059\u3002
\nhasNext()\u306f\u6b21\u306e\u8981\u7d20\u3092\u6301\u3064\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002
\nnext()\u306f\u6b21\u306e\u8981\u7d20\u304c\u3042\u3063\u305f\u969b\u306b\u6b21\u306e\u8981\u7d20\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
public<\/span> interface<\/span> Iterator<\/span> {<\/span>\r\n    public<\/span> abstract<\/span> boolean<\/span> hasNext<\/span>();<\/span>\r\n\r\n    public<\/span> abstract<\/span> Object<\/span> next<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5b9e\u73b0\u7c7b<\/h3>\n
\u5b9e\u73b0\u63a5\u53e3\u5e76\u7f16\u5199\u5177\u4f53\u5904\u7406\u3002\u5173\u4e8e\u5177\u4f53\u4f8b\u5b50\uff0c\u6211\u4eec\u5c06\u5728\u540e\u9762\u8fdb\u884c\u8bf4\u660e\u3002<\/p>\n
    \n
  • \n
      ConcreateAggreate<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        ConcreateIterator<\/ul>\n
        \u5177\u4f53\u4f8b\u5b50<\/h2>\n
        \u4ee5\u4e0b\u662f\u5173\u4e8e”\u5c06\u5458\u5de5\u8fdb\u884c\u5206\u7c7b\u7684\u5458\u5de5\u5217\u8868” \u548c”\u5458\u5de5\u5217\u8868\u7684\u8fed\u4ee3\u5668”\u7684\u5177\u4f53\u4f8b\u5b50\u8bf4\u660e\u3002<\/p>\n
        \u5b9e\u73b0\u7c7b<\/h3>\n
        Employee\u30af\u30e9\u30b9
        \nEmployee(\u5f93\u696d\u54e1)\u30af\u30e9\u30b9\u306f\u96c6\u5408\u4f53\u306e\u8981\u7d20\u3092\u8868\u3057\u307e\u3059\u3002
        \n\u540d\u524d\u3068\u5f93\u696d\u54e1\u30b3\u30fc\u30c9\u3092\u6301\u3061\u307e\u3059\u3002<\/p>\n
        public<\/span> class<\/span> Employee<\/span> {<\/span>\r\n    private<\/span> String<\/span> name<\/span>;<\/span>\r\n    private<\/span> String<\/span> employeeCode<\/span>;<\/span>\r\n\r\n    public<\/span> Employee<\/span>(<\/span>String<\/span> name<\/span>,<\/span> String<\/span> employeeCode<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>;<\/span>\r\n        this<\/span>.<\/span>employeeCode<\/span> =<\/span> employeeCode<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> String<\/span> getName<\/span>()<\/span> {<\/span>\r\n        return<\/span> name<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> String<\/span> getEmployeeCode<\/span>()<\/span> {<\/span>\r\n        return<\/span> employeeCode<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        EmployeeList\u30af\u30e9\u30b9
        \nEmployeeList(\u5f93\u696d\u54e1\u30ea\u30b9\u30c8)\u30af\u30e9\u30b9\u306f\u5f93\u696d\u54e1\u306e\u96c6\u5408\u4f53\u3092\u8868\u3057\u307e\u3059\u3002
        \n\u5f93\u696d\u54e1\u306e\u914d\u5217\u3068\u6dfb\u3048\u5b57\u3092\u6301\u3061\u307e\u3059\u3002
        \niterator()\u306b\u304a\u3044\u3066\u81ea\u8eab\u3092\u5f15\u6570\u3068\u3057\u3066EmployeeListIterator\u3092\u751f\u6210\u3057\u3066\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
        public<\/span> class<\/span> EmployeeList<\/span> implements<\/span> Aggregate<\/span> {<\/span>\r\n    private<\/span> Employee<\/span>[]<\/span> employees<\/span>;<\/span>\r\n    private<\/span> int<\/span> last<\/span> =<\/span> 0<\/span>;<\/span>\r\n\r\n    public<\/span> EmployeeList<\/span>(<\/span>int<\/span> maxsize<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>employees<\/span> =<\/span> new<\/span> Employee<\/span>[<\/span>maxsize<\/span>];<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> Employee<\/span> getEmployeeAt<\/span>(<\/span>int<\/span> index<\/span>)<\/span> {<\/span>\r\n        return<\/span> employees<\/span>[<\/span>index<\/span>];<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> void<\/span> appendEmployee<\/span>(<\/span>Employee<\/span> employee<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>employees<\/span>[<\/span>last<\/span>]<\/span> =<\/span> employee<\/span>;<\/span>\r\n        last<\/span>++;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> int<\/span> getLength<\/span>()<\/span> {<\/span>\r\n        return<\/span> last<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> Iterator<\/span> iterator<\/span>()<\/span> {<\/span>\r\n        return<\/span> new<\/span> EmployeeListIterator<\/span>(<\/span>this<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        EmployeeListIterator\u30af\u30e9\u30b9
        \nEmployeeListIterator(\u5f93\u696d\u54e1\u30ea\u30b9\u30c8Iterator)\u30af\u30e9\u30b9\u306f\u5f93\u696d\u54e1\u306e\u96c6\u5408\u4f53\u3092\u6570\u3048\u4e0a\u3052\u308b\u3082\u306e\u3092\u8868\u3057\u307e\u3059\u3002
        \n\u5f93\u696d\u54e1\u30ea\u30b9\u30c8\u3068\u6dfb\u3048\u5b57\u3092\u6301\u3061\u307e\u3059\u3002
        \nhasNext()\u3067\u5f93\u696d\u54e1\u30ea\u30b9\u30c8\u304c\u6b21\u306e\u8981\u7d20\u3092\u6301\u3064\u304b\u3092\u78ba\u8a8d\u3057\u3001next()\u3067\u5f93\u696d\u54e1\u30ea\u30b9\u30c8\u306e\u6b21\u306e\u8981\u7d20(\u5f93\u696d\u54e1)\u3092\u8fd4\u5374\u3057\u3066\u3044\u307e\u3059\u3002
        \n\u9806\u6b21\u306b\u30a2\u30af\u30bb\u30b9\u3092\u884c\u3046\u65b9\u6cd5\u306f\u69d8\u3005\u3067\u3059\u304c\u3001\u4eca\u56de\u306f\u5358\u7d14\u306b\u524d\u304b\u3089\u9806\u6b21\u3067\u30a2\u30af\u30bb\u30b9\u3059\u308b\u5b9f\u88c5\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n
        public<\/span> class<\/span> EmployeeListIterator<\/span> implements<\/span> Iterator<\/span> {<\/span>\r\n    private<\/span> EmployeeList<\/span> employeeList<\/span>;<\/span>\r\n    private<\/span> int<\/span> index<\/span>;<\/span>\r\n\r\n    public<\/span> EmployeeListIterator<\/span>(<\/span>EmployeeList<\/span> employeeList<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>employeeList<\/span> =<\/span> employeeList<\/span>;<\/span>\r\n        this<\/span>.<\/span>index<\/span> =<\/span> 0<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> boolean<\/span> hasNext<\/span>()<\/span> {<\/span>\r\n        if<\/span> (<\/span>index<\/span> <<\/span> employeeList<\/span>.<\/span>getLength<\/span>())<\/span> {<\/span>\r\n            return<\/span> true<\/span>;<\/span>\r\n        }<\/span> else<\/span> {<\/span>\r\n            return<\/span> false<\/span>;<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> Object<\/span> next<\/span>()<\/span> {<\/span>\r\n        Employee<\/span> employee<\/span> =<\/span> employeeList<\/span>.<\/span>getEmployeeAt<\/span>(<\/span>index<\/span>);<\/span>\r\n        index<\/span>++;<\/span>\r\n        return<\/span> employee<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u6267\u884c\u7c7b<\/h3>\n
        Main\u30af\u30e9\u30b9
        \n\u5f93\u696d\u54e1\u30ea\u30b9\u30c8\u306b\u5f93\u696d\u54e1\u3092\u8ffd\u52a0\u3057\u3001\u8ffd\u52a0\u3057\u305f\u5f93\u696d\u54e1\u306e\u540d\u524d\u3068\u5f93\u696d\u54e1\u30b3\u30fc\u30c9\u3092\u5f93\u696d\u54e1\u30ea\u30b9\u30c8\u304b\u3089\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
        public<\/span> class<\/span> Main<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        EmployeeList<\/span> employeeList<\/span> =<\/span> new<\/span> EmployeeList<\/span>(<\/span>4<\/span>);<\/span>\r\n        employeeList<\/span>.<\/span>appendEmployee<\/span>(<\/span>new<\/span> Employee<\/span>(<\/span>\"Tarou_Tanaka\"<\/span>,<\/span> \"C001\"<\/span>));<\/span>\r\n        employeeList<\/span>.<\/span>appendEmployee<\/span>(<\/span>new<\/span> Employee<\/span>(<\/span>\"Hanako_Yamada\"<\/span>,<\/span> \"C002\"<\/span>));<\/span>\r\n        employeeList<\/span>.<\/span>appendEmployee<\/span>(<\/span>new<\/span> Employee<\/span>(<\/span>\"Yuuya_Suzuki\"<\/span>,<\/span> \"C003\"<\/span>));<\/span>\r\n        employeeList<\/span>.<\/span>appendEmployee<\/span>(<\/span>new<\/span> Employee<\/span>(<\/span>\"Kanako_Satou\"<\/span>,<\/span> \"C004\"<\/span>));<\/span>\r\n        Iterator<\/span> it<\/span> =<\/span> employeeList<\/span>.<\/span>iterator<\/span>();<\/span>\r\n        while<\/span> (<\/span>it<\/span>.<\/span>hasNext<\/span>())<\/span> {<\/span>\r\n            Employee<\/span> employee<\/span> =<\/span> (<\/span>Employee<\/span>)<\/span> it<\/span>.<\/span>next<\/span>();<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>employee<\/span>.<\/span>getName<\/span>()<\/span> +<\/span> \":\"<\/span> +<\/span> employee<\/span>.<\/span>getEmployeeCode<\/span>());<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u6267\u884c\u7ed3\u679c<\/h3>\n
        \u6267\u884cMain.class\u7684\u7ed3\u679c\u5982\u4e0b\u6240\u793a\u3002
        \n\u53ef\u4ee5\u786e\u8ba4\u5458\u5de5\u5217\u8868\u6309\u6dfb\u52a0\u987a\u5e8f\u6b63\u786e\u8f93\u51fa\u3002<\/p>\n
        Tarou_Tanaka:C001\r\nHanako_Yamada:C002\r\nYuuya_Suzuki:C003\r\nKanako_Satou:C004\r\n<\/code><\/pre>\n
        \u4f18\u70b9<\/h2>\n
        \u901a\u8fc7\u4f7f\u7528Iterator\uff0c\u60a8\u65e0\u9700\u5173\u6ce8\u96c6\u5408\u4f53\u662f\u4ec0\u4e48\u6837\u7684\u96c6\u5408\u4f53\uff08\u4f8b\u5982\u6570\u7ec4\u3001ArrayList\u3001Vector\u7b49\uff09\uff0c\u4ee5\u53ca\u8fdb\u884c\u4e86\u600e\u6837\u7684\u5b9e\u73b0\uff0c\u5373\u53ef\u8fdb\u884c\u8ba1\u6570\u3002\u4ee5\u4e0b\u662f\u5c06\u96c6\u5408\u4f53\u4ece\u6570\u7ec4\u66f4\u6539\u4e3aArrayList\u7684EmployeeList.class\u7684\u5b9a\u4e49\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u60a8\u65e0\u9700\u4fee\u6539\u6267\u884c\u7c7bMain.class\uff0c\u8f93\u51fa\u7ed3\u679c\u4e0e\u6570\u7ec4\u76f8\u540c\u3002<\/p>\n
        import<\/span> java.util.ArrayList<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> EmployeeList<\/span> implements<\/span> Aggregate<\/span> {<\/span>\r\n    private<\/span> ArrayList<\/span><<\/span>Employee<\/span>><\/span> employees<\/span>;<\/span>\r\n\r\n    public<\/span> EmployeeList<\/span>(<\/span>int<\/span> initialsize<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>employees<\/span> =<\/span> new<\/span> ArrayList<\/span><>(<\/span>initialsize<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> Employee<\/span> getEmployeeAt<\/span>(<\/span>int<\/span> index<\/span>)<\/span> {<\/span>\r\n        return<\/span> (<\/span>Employee<\/span>)<\/span> employees<\/span>.<\/span>get<\/span>(<\/span>index<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> void<\/span> appendEmployee<\/span>(<\/span>Employee<\/span> employee<\/span>)<\/span> {<\/span>\r\n        employees<\/span>.<\/span>add<\/span>(<\/span>employee<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> int<\/span> getLength<\/span>()<\/span> {<\/span>\r\n        return<\/span> employees<\/span>.<\/span>size<\/span>();<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> Iterator<\/span> iterator<\/span>()<\/span> {<\/span>\r\n        return<\/span> new<\/span> EmployeeListIterator<\/span>(<\/span>this<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        Tarou_Tanaka:C001\r\nHanako_Yamada:C002\r\nYuuya_Suzuki:C003\r\nKanako_Satou:C004\r\n<\/code><\/pre>\n
        \u989d\u5916\u6dfb\u52a0 (2018\/10\/31)<\/h1>\n
        \u9664\u4e86\u6309\u7167\u987a\u5e8f\u9010\u4e2a\u8bbf\u95ee\uff0cIterator\u8fd8\u6709\u5404\u79cd\u5176\u4ed6\u8bbf\u95ee\u65b9\u6cd5\uff08\u4f8b\u5982\u9006\u5e8f\u3001\u8df3\u8dc3\u4e00\u4e2a\u7b49\u7b49\uff09\u3002\u8fd9\u6b21\u6211\u4eec\u5728ArrayList\u4e2d\u6dfb\u52a0\u4e86\u53ef\u4ee5\u9006\u5e8f\u8bbf\u95ee\u7684Iterator\u3002\u53ea\u5c55\u793a\u6709\u5dee\u5f02\u7684\u7c7b\uff0c\u8bf7\u5728\u603b\u7ed3\u4e2d\u786e\u8ba4\u5176\u4ed6\u7c7b\u3002<\/p>\n
        \u63a5\u53e3<\/h2>\n
        Aggregate
        \n\u9006\u9806\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308bIterator\u3092\u751f\u6210\u3059\u308breverseIterator()\u3092\u8ffd\u52a0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
        public<\/span> interface<\/span> Aggregate<\/span> {<\/span>\r\n    public<\/span> abstract<\/span> Iterator<\/span> iterator<\/span>();<\/span>\r\n\r\n    public<\/span> abstract<\/span> Iterator<\/span> reverseIterator<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u5b9e\u73b0\u7c7b<\/h2>\n
        EmployeeList\u30af\u30e9\u30b9
        \nreverseIterator()\u3092\u8ffd\u52a0\u3057\u3066\u3044\u307e\u3059\u3002
        \nreverseIterator()\u306b\u304a\u3044\u3066\u81ea\u8eab\u3092\u5f15\u6570\u3068\u3057\u3066EmployeeListReverseIterator\u3092\u751f\u6210\u3057\u3066\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
        import<\/span> java.util.ArrayList<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> EmployeeList<\/span> implements<\/span> Aggregate<\/span> {<\/span>\r\n    private<\/span> ArrayList<\/span><<\/span>Employee<\/span>><\/span> employees<\/span>;<\/span>\r\n\r\n    public<\/span> EmployeeList<\/span>(<\/span>int<\/span> initialsize<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>employees<\/span> =<\/span> new<\/span> ArrayList<\/span><>(<\/span>initialsize<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> Employee<\/span> getEmployeeAt<\/span>(<\/span>int<\/span> index<\/span>)<\/span> {<\/span>\r\n        return<\/span> (<\/span>Employee<\/span>)<\/span> employees<\/span>.<\/span>get<\/span>(<\/span>index<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> void<\/span> appendEmployee<\/span>(<\/span>Employee<\/span> employee<\/span>)<\/span> {<\/span>\r\n        employees<\/span>.<\/span>add<\/span>(<\/span>employee<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> int<\/span> getLength<\/span>()<\/span> {<\/span>\r\n        return<\/span> employees<\/span>.<\/span>size<\/span>();<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> Iterator<\/span> iterator<\/span>()<\/span> {<\/span>\r\n        return<\/span> new<\/span> EmployeeListIterator<\/span>(<\/span>this<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> Iterator<\/span> reverseIterator<\/span>()<\/span> {<\/span>\r\n        return<\/span> new<\/span> EmployeeListReverseIterator<\/span>(<\/span>this<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        EmployeeListReverseIterator\u30af\u30e9\u30b9
        \n\u65b0\u898f\u306b\u4f5c\u6210\u3059\u308b\u30af\u30e9\u30b9\u3067\u3059\u304c\u3001\u9806\u6b21\u30a2\u30af\u30bb\u30b9\u3092\u884c\u3046EmployeeListIterator.class\u3068\u540c\u69d8\u306bhasNext()\u3068next()\u3092\u5b9f\u88c5\u3057\u3066\u3044\u307e\u3059\u3002
        \n\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067employeeList\u306e\u8981\u7d20\u6570\u304b\u30891\u3092\u5f15\u3044\u305f\u6570\u5b57\u3092index\u306b\u6301\u3061\u307e\u3059\u3002
        \n\u3053\u308c\u306b\u3088\u308a\u4eee\u306b\u8981\u7d20\u6570\u304c5\u306e\u30ea\u30b9\u30c8\u304b\u3089\u306f4\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002
        \nhasNext()\u3067\u306fArrayList\u306e\u8981\u7d20\u306e\u6570\u3060\u3051\u9006\u9806\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3092\u884c\u3044\u307e\u3059\u3002
        \n\u6ce8\u610f\u3059\u3079\u304d\u70b9\u3068\u3057\u3066\u306f\u30eb\u30fc\u30d7\u306e\u6761\u4ef6\u3067index\u304c0\u672a\u6e80\u306b\u306a\u3089\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u3067\u3059\u3002
        \n\u3053\u306e\u6761\u4ef6\u304c\u306a\u3051\u308c\u3070next()\u3067employeeList[-1]\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3057\u3066\u3057\u307e\u3044ArrayIndexOutOfBoundsException\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n
        public<\/span> class<\/span> EmployeeListReverseIterator<\/span> implements<\/span> Iterator<\/span> {<\/span>\r\n    private<\/span> EmployeeList<\/span> employeeList<\/span>;<\/span>\r\n    private<\/span> int<\/span> index<\/span>;<\/span>\r\n\r\n    public<\/span> EmployeeListReverseIterator<\/span>(<\/span>EmployeeList<\/span> employeeList<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>employeeList<\/span> =<\/span> employeeList<\/span>;<\/span>\r\n        this<\/span>.<\/span>index<\/span> =<\/span> employeeList<\/span>.<\/span>getLength<\/span>()<\/span> -<\/span> 1<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> boolean<\/span> hasNext<\/span>()<\/span> {<\/span>\r\n        if<\/span> (<\/span>index<\/span> <<\/span> employeeList<\/span>.<\/span>getLength<\/span>()<\/span> &&<\/span> index<\/span> >=<\/span> 0<\/span>)<\/span> {<\/span>\r\n            return<\/span> true<\/span>;<\/span>\r\n        }<\/span> else<\/span> {<\/span>\r\n            return<\/span> false<\/span>;<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> Object<\/span> next<\/span>()<\/span> {<\/span>\r\n        Employee<\/span> employee<\/span> =<\/span> employeeList<\/span>.<\/span>getEmployeeAt<\/span>(<\/span>index<\/span>);<\/span>\r\n        index<\/span>--;<\/span>\r\n        return<\/span> employee<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u6267\u884c\u7c7b<\/h2>\n
        Main\u30af\u30e9\u30b9
        \nEmployeeList\u306bEmployee\u3092\u8ffd\u52a0\u3057\u3001\u9806\u6b21\u3067\u51fa\u529b\u3092\u3057\u305f\u5f8c\u3001\u9006\u9806\u3067\u51fa\u529b\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
        public<\/span> class<\/span> Main<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        EmployeeList<\/span> employeeList<\/span> =<\/span> new<\/span> EmployeeList<\/span>(<\/span>4<\/span>);<\/span>\r\n        employeeList<\/span>.<\/span>appendEmployee<\/span>(<\/span>new<\/span> Employee<\/span>(<\/span>\"Tarou_Tanaka\"<\/span>,<\/span> \"C001\"<\/span>));<\/span>\r\n        employeeList<\/span>.<\/span>appendEmployee<\/span>(<\/span>new<\/span> Employee<\/span>(<\/span>\"Hanako_Yamada\"<\/span>,<\/span> \"C002\"<\/span>));<\/span>\r\n        employeeList<\/span>.<\/span>appendEmployee<\/span>(<\/span>new<\/span> Employee<\/span>(<\/span>\"Yuuya_Suzuki\"<\/span>,<\/span> \"C003\"<\/span>));<\/span>\r\n        employeeList<\/span>.<\/span>appendEmployee<\/span>(<\/span>new<\/span> Employee<\/span>(<\/span>\"Kanako_Satou\"<\/span>,<\/span> \"C004\"<\/span>));<\/span>\r\n        Iterator<\/span> it<\/span> =<\/span> employeeList<\/span>.<\/span>iterator<\/span>();<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"------- Order -------\"<\/span>);<\/span>\r\n        while<\/span> (<\/span>it<\/span>.<\/span>hasNext<\/span>())<\/span> {<\/span>\r\n            Employee<\/span> employee<\/span> =<\/span> (<\/span>Employee<\/span>)<\/span> it<\/span>.<\/span>next<\/span>();<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>employee<\/span>.<\/span>getName<\/span>()<\/span> +<\/span> \":\"<\/span> +<\/span> employee<\/span>.<\/span>getEmployeeCode<\/span>());<\/span>\r\n        }<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"------- Reverse Order -------\"<\/span>);<\/span>\r\n        Iterator<\/span> rit<\/span> =<\/span> employeeList<\/span>.<\/span>reverseIterator<\/span>();<\/span>\r\n        while<\/span> (<\/span>rit<\/span>.<\/span>hasNext<\/span>())<\/span> {<\/span>\r\n            Employee<\/span> employee<\/span> =<\/span> (<\/span>Employee<\/span>)<\/span> rit<\/span>.<\/span>next<\/span>();<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>employee<\/span>.<\/span>getName<\/span>()<\/span> +<\/span> \":\"<\/span> +<\/span> employee<\/span>.<\/span>getEmployeeCode<\/span>());<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u6267\u884c\u7ed3\u679c<\/h2>\n
        \u6267\u884cMain.class\u7684\u7ed3\u679c\u5982\u4e0b\u6240\u793a\u3002\u60a8\u53ef\u4ee5\u786e\u8ba4employeeList\u6309\u6dfb\u52a0\u987a\u5e8f\u548c\u76f8\u53cd\u987a\u5e8f\u8fdb\u884c\u4e86\u8f93\u51fa\u3002<\/p>\n
        ------- Order -------\r\nTarou_Tanaka:C001\r\nHanako_Yamada:C002\r\nYuuya_Suzuki:C003\r\nKanako_Satou:C004\r\n------- Reverse Order -------\r\nKanako_Satou:C004\r\nYuuya_Suzuki:C003\r\nHanako_Yamada:C002\r\nTarou_Tanaka:C001\r\n<\/code><\/pre>\n
        \u603b\u7ed3<\/h1>\n
        \u6211\u5011\u5b78\u7fd2\u4e86\u9806\u5e8f\u8a2a\u554f\u96c6\u5408\u5143\u7d20\u7684\u8fed\u4ee3\u5668\u6a21\u5f0f\u3002
        \n\u5982\u679c\u65b9\u4fbf\u7684\u8a71\uff0c\u4f60\u53ef\u4ee5\u53c3\u8003\u4ee5\u4e0b\u7684\u7a0b\u5f0f\u78bc\u793a\u4f8b\u3002<\/p>\n
          Iterator\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/ul>\n
          \u6b64\u5916\uff0c\u5173\u4e8e\u5176\u4ed6\u8bbe\u8ba1\u6a21\u5f0f\u7684\u4fe1\u606f\u6211\u5df2\u7ecf\u5728\u4e0b\u9762\u505a\u4e86\u603b\u7ed3\uff0c\u4e5f\u8bf7\u60a8\u53c2\u8003\u4e00\u4e0b\u3002<\/p>\n
            [\u968f\u6642\u66f4\u65b0]Java\u3067\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u307e\u3068\u3081<\/ul>\n
            \u53ef\u4ee5\u63d0\u4f9b\u5199\u8bba\u6587\u6240\u9700\u7684\u6240\u6709\u4fe1\u606f\u548c\u5f15\u7528\u6587\u732e\u3002<\/h1>\n
              \u5897\u88dc\u6539\u8a02\u7248 Java\u8a00\u8a9e\u3067\u5b66\u3076\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u5165\u9580<\/ul>\n","protected":false},"excerpt":{"rendered":"
              \u9996\u5148 \u6211\u6253\u7b97\u8bfb\u4e00\u672c\u4ecb\u7ecdGoF\u8bbe\u8ba1\u6a21\u5f0f\u7684\u300aJava\u8bed\u8a00\u5b66\u4e60\u8bbe\u8ba1\u6a21\u5f0f\u5165\u95e8\u589e\u8865\u6539\u8ba2\u7248\u300b\uff0c\u5e76\u603b\u7ed3\u6240\u5b66\u5185\u5bb9\u3002 \u8fed\u4ee3\u5668\u6a21\u5f0f […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31716","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u5728Java\u4e2d\u4f7f\u7528\u8fed\u4ee3\u5668\u6a21\u5f0f - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5728java\u4e2d\u4f7f\u7528\u8fed\u4ee3\u5668\u6a21\u5f0f\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5728Java\u4e2d\u4f7f\u7528\u8fed\u4ee3\u5668\u6a21\u5f0f\" \/>\n<meta property=\"og:description\" content=\"\u9996\u5148 \u6211\u6253\u7b97\u8bfb\u4e00\u672c\u4ecb\u7ecdGoF\u8bbe\u8ba1\u6a21\u5f0f\u7684\u300aJava\u8bed\u8a00\u5b66\u4e60\u8bbe\u8ba1\u6a21\u5f0f\u5165\u95e8\u589e\u8865\u6539\u8ba2\u7248\u300b\uff0c\u5e76\u603b\u7ed3\u6240\u5b66\u5185\u5bb9\u3002 \u8fed\u4ee3\u5668\u6a21\u5f0f […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5728java\u4e2d\u4f7f\u7528\u8fed\u4ee3\u5668\u6a21\u5f0f\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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