{"id":655,"date":"2024-02-09T09:06:27","date_gmt":"2023-05-19T04:46:09","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%9c%a8java%e4%b8%ad%e7%9a%84%e8%bf%ad%e4%bb%a3%e5%99%a8%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f\/"},"modified":"2025-08-03T01:14:03","modified_gmt":"2025-08-02T17:14:03","slug":"%e5%9c%a8java%e4%b8%ad%e7%9a%84%e8%bf%ad%e4%bb%a3%e5%99%a8%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%e7%9a%84%e8%bf%ad%e4%bb%a3%e5%99%a8%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f\/","title":{"rendered":"Java\u8fed\u4ee3\u5668\u8bbe\u8ba1\u6a21\u5f0f\u5b8c\u5168\u6307\u5357\uff1a\u539f\u7406\u3001\u5b9e\u73b0\u4e0e\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"

\u8fed\u4ee3\u5668\u8bbe\u8ba1\u6a21\u5f0f\u662f\u884c\u4e3a\u6a21\u5f0f\u4e4b\u4e00\u3002\u8fed\u4ee3\u5668\u6a21\u5f0f\u7528\u4e8e\u63d0\u4f9b\u4e00\u79cd\u6807\u51c6\u7684\u65b9\u6cd5\u6765\u904d\u5386\u4e00\u7ec4\u5bf9\u8c61\u3002\u8fed\u4ee3\u5668\u6a21\u5f0f\u5728Java\u96c6\u5408\u6846\u67b6\u4e2d\u88ab\u5e7f\u6cdb\u4f7f\u7528\u3002\u8fed\u4ee3\u5668\u63a5\u53e3\u63d0\u4f9b\u4e86\u904d\u5386\u96c6\u5408\u7684\u65b9\u6cd5\u3002<\/p>\n

\u8fed\u4ee3\u5668\u8bbe\u8ba1\u6a21\u5f0f<\/h2>\n

\u6839\u636eGoF\u6240\u8ff0\uff0c\u8fed\u4ee3\u5668\u8bbe\u8ba1\u6a21\u5f0f\u7684\u610f\u56fe\u662f\uff1a<\/p>\n

\u63d0\u4f9b\u4e86\u4e00\u79cd\u8bbf\u95ee\u805a\u5408\u5bf9\u8c61\u5143\u7d20\u7684\u65b9\u5f0f\uff0c\u800c\u4e0d\u66b4\u9732\u5176\u5e95\u5c42\u8868\u793a\u3002<\/p><\/blockquote>\n

\u8fed\u4ee3\u5668\u6a21\u5f0f\u4e0d\u4ec5\u4ec5\u662f\u7528\u4e8e\u904d\u5386\u96c6\u5408\uff0c\u6839\u636e\u6211\u4eec\u7684\u9700\u6c42\uff0c\u6211\u4eec\u53ef\u4ee5\u63d0\u4f9b\u4e0d\u540c\u7c7b\u578b\u7684\u8fed\u4ee3\u5668\u3002\u8fed\u4ee3\u5668\u8bbe\u8ba1\u6a21\u5f0f\u9690\u85cf\u4e86\u904d\u5386\u96c6\u5408\u7684\u5b9e\u9645\u5b9e\u73b0\uff0c\u5ba2\u6237\u7a0b\u5e8f\u53ea\u9700\u4f7f\u7528\u8fed\u4ee3\u5668\u65b9\u6cd5\u3002<\/p>\n

\u8fed\u4ee3\u5668\u6a21\u5f0f\u7684\u4e00\u4e2a\u4f8b\u5b50<\/h3>\n

\u8ba9\u6211\u4eec\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u6765\u7406\u89e3\u8fed\u4ee3\u5668\u6a21\u5f0f\u3002\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u7535\u53f0\u9891\u9053\u7684\u5217\u8868\uff0c\u5ba2\u6237\u7aef\u7a0b\u5e8f\u5e0c\u671b\u4e00\u6b21\u4e00\u4e2a\u5730\u904d\u5386\u5b83\u4eec\uff0c\u6216\u8005\u6839\u636e\u9891\u9053\u7c7b\u578b\u904d\u5386\u3002\u4f8b\u5982\uff0c\u67d0\u4e9b\u5ba2\u6237\u7aef\u7a0b\u5e8f\u53ea\u5bf9\u82f1\u8bed\u9891\u9053\u611f\u5174\u8da3\uff0c\u5e76\u4e14\u53ea\u60f3\u5904\u7406\u5b83\u4eec\uff0c\u4e0d\u60f3\u5904\u7406\u5176\u4ed6\u7c7b\u578b\u7684\u9891\u9053\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u5411\u5ba2\u6237\u7aef\u63d0\u4f9b\u4e00\u4e2a\u9891\u9053\u96c6\u5408\uff0c\u5e76\u8ba9\u4ed6\u4eec\u7f16\u5199\u904d\u5386\u9891\u9053\u7684\u903b\u8f91\u5e76\u51b3\u5b9a\u662f\u5426\u5904\u7406\u5b83\u4eec\u3002\u4f46\u662f\u8fd9\u79cd\u89e3\u51b3\u65b9\u6848\u5b58\u5728\u5f88\u591a\u95ee\u9898\uff0c\u4f8b\u5982\u5ba2\u6237\u7aef\u5fc5\u987b\u63d0\u51fa\u904d\u5386\u903b\u8f91\u3002\u6211\u4eec\u4e0d\u80fd\u786e\u4fdd\u5ba2\u6237\u7aef\u7684\u903b\u8f91\u662f\u6b63\u786e\u7684\u3002\u800c\u4e14\uff0c\u5982\u679c\u5ba2\u6237\u7aef\u6570\u91cf\u589e\u52a0\uff0c\u90a3\u4e48\u7ef4\u62a4\u5c06\u53d8\u5f97\u975e\u5e38\u56f0\u96be\u3002\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u8fed\u4ee3\u5668\u6a21\u5f0f\uff0c\u5e76\u6839\u636e\u9891\u9053\u7c7b\u578b\u63d0\u4f9b\u8fed\u4ee3\u3002\u6211\u4eec\u5e94\u8be5\u786e\u4fdd\u5ba2\u6237\u7aef\u7a0b\u5e8f\u53ea\u80fd\u901a\u8fc7\u8fed\u4ee3\u5668\u8bbf\u95ee\u9891\u9053\u5217\u8868\u3002\u5b9e\u65bd\u7684\u7b2c\u4e00\u90e8\u5206\u662f\u4e3a\u6211\u4eec\u7684\u96c6\u5408\u548c\u8fed\u4ee3\u5668\u63a5\u53e3\u5b9a\u4e49\u5951\u7ea6\u3002 ChannelTypeEnum.java<\/p>\n

package com.Olivia.design.iterator;\r\n\r\npublic enum ChannelTypeEnum {\r\n\r\n\tENGLISH, HINDI, FRENCH, ALL;\r\n}\r\n<\/code><\/pre>\n
ChannelTypeEnum\u662f\u4e00\u4e2aJava\u679a\u4e3e\uff0c\u7528\u4e8e\u5b9a\u4e49\u6240\u6709\u4e0d\u540c\u7c7b\u578b\u7684\u6e20\u9053\u3002Channel.java<\/p>\n
package com.Olivia.design.iterator;\r\n\r\npublic class Channel {\r\n\r\n\tprivate double frequency;\r\n\tprivate ChannelTypeEnum TYPE;\r\n\t\r\n\tpublic Channel(double freq, ChannelTypeEnum type){\r\n\t\tthis.frequency=freq;\r\n\t\tthis.TYPE=type;\r\n\t}\r\n\r\n\tpublic double getFrequency() {\r\n\t\treturn frequency;\r\n\t}\r\n\r\n\tpublic ChannelTypeEnum getTYPE() {\r\n\t\treturn TYPE;\r\n\t}\r\n\t\r\n\t@Override\r\n\tpublic String toString(){\r\n\t\treturn \"Frequency=\"+this.frequency+\", Type=\"+this.TYPE;\r\n\t}\r\n\t\r\n}\r\n<\/code><\/pre>\n
Channel \u662f\u4e00\u4e2a\u7b80\u5355\u7684 POJO \u7c7b\uff0c\u5177\u6709\u9891\u7387\u548c\u9891\u9053\u7c7b\u578b\u8fd9\u4e24\u4e2a\u5c5e\u6027\u3002ChannelCollection.java<\/p>\n
package com.Olivia.design.iterator;\r\n\r\npublic interface ChannelCollection {\r\n\r\n\tpublic void addChannel(Channel c);\r\n\t\r\n\tpublic void removeChannel(Channel c);\r\n\t\r\n\tpublic ChannelIterator iterator(ChannelTypeEnum type);\r\n\t\r\n}\r\n<\/code><\/pre>\n
ChannelCollection\u63a5\u53e3\u5b9a\u4e49\u4e86\u6211\u4eec\u7684\u96c6\u5408\u7c7b\u5b9e\u73b0\u7684\u5951\u7ea6\u3002\u8bf7\u6ce8\u610f\uff0c\u6709\u6dfb\u52a0\u548c\u5220\u9664\u9891\u9053\u7684\u65b9\u6cd5\uff0c\u4f46\u6ca1\u6709\u8fd4\u56de\u9891\u9053\u5217\u8868\u7684\u65b9\u6cd5\u3002ChannelCollection\u6709\u4e00\u4e2a\u8fd4\u56de\u904d\u5386\u7684\u8fed\u4ee3\u5668\u7684\u65b9\u6cd5\u3002 ChannelIterator\u63a5\u53e3\u5b9a\u4e49\u4e86\u4ee5\u4e0b\u65b9\u6cd5\uff1bChannelIterator.java<\/p>\n
package com.Olivia.design.iterator;\r\n\r\npublic interface ChannelIterator {\r\n\r\n\tpublic boolean hasNext();\r\n\t\r\n\tpublic Channel next();\r\n}\r\n<\/code><\/pre>\n
\u73b0\u5728\u6211\u4eec\u7684\u57fa\u672c\u63a5\u53e3\u548c\u6838\u5fc3\u7c7b\u5df2\u7ecf\u51c6\u5907\u597d\u4e86\uff0c\u8ba9\u6211\u4eec\u7ee7\u7eed\u5b9e\u73b0\u96c6\u5408\u7c7b\u548c\u8fed\u4ee3\u5668\u3002ChannelCollectionImpl.java\u3002<\/p>\n
package com.Olivia.design.iterator;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\n\r\npublic class ChannelCollectionImpl implements ChannelCollection {\r\n\r\n\tprivate List<Channel> channelsList;\r\n\r\n\tpublic ChannelCollectionImpl() {\r\n\t\tchannelsList = new ArrayList<>();\r\n\t}\r\n\r\n\tpublic void addChannel(Channel c) {\r\n\t\tthis.channelsList.add(c);\r\n\t}\r\n\r\n\tpublic void removeChannel(Channel c) {\r\n\t\tthis.channelsList.remove(c);\r\n\t}\r\n\r\n\t@Override\r\n\tpublic ChannelIterator iterator(ChannelTypeEnum type) {\r\n\t\treturn new ChannelIteratorImpl(type, this.channelsList);\r\n\t}\r\n\r\n\tprivate class ChannelIteratorImpl implements ChannelIterator {\r\n\r\n\t\tprivate ChannelTypeEnum type;\r\n\t\tprivate List<Channel> channels;\r\n\t\tprivate int position;\r\n\r\n\t\tpublic ChannelIteratorImpl(ChannelTypeEnum ty,\r\n\t\t\t\tList<Channel> channelsList) {\r\n\t\t\tthis.type = ty;\r\n\t\t\tthis.channels = channelsList;\r\n\t\t}\r\n\r\n\t\t@Override\r\n\t\tpublic boolean hasNext() {\r\n\t\t\twhile (position < channels.size()) {\r\n\t\t\t\tChannel c = channels.get(position);\r\n\t\t\t\tif (c.getTYPE().equals(type) || type.equals(ChannelTypeEnum.ALL)) {\r\n\t\t\t\t\treturn true;\r\n\t\t\t\t} else\r\n\t\t\t\t\tposition++;\r\n\t\t\t}\r\n\t\t\treturn false;\r\n\t\t}\r\n\r\n\t\t@Override\r\n\t\tpublic Channel next() {\r\n\t\t\tChannel c = channels.get(position);\r\n\t\t\tposition++;\r\n\t\t\treturn c;\r\n\t\t}\r\n\r\n\t}\r\n}\r\n<\/code><\/pre>\n
\u6ce8\u610f\u8fed\u4ee3\u5668\u63a5\u53e3\u7684\u5185\u90e8\u7c7b\u5b9e\u73b0\uff0c\u4f7f\u5f97\u8be5\u5b9e\u73b0\u4e0d\u80fd\u88ab\u4efb\u4f55\u5176\u4ed6\u96c6\u5408\u4f7f\u7528\u3002\u96c6\u5408\u7c7b\u4e5f\u91c7\u7528\u76f8\u540c\u7684\u65b9\u6cd5\uff0c\u5b83\u4eec\u90fd\u5177\u6709\u8fed\u4ee3\u5668\u63a5\u53e3\u7684\u5185\u90e8\u7c7b\u5b9e\u73b0\u3002\u8ba9\u6211\u4eec\u7f16\u5199\u4e00\u4e2a\u7b80\u5355\u7684\u8fed\u4ee3\u5668\u6a21\u5f0f\u6d4b\u8bd5\u7a0b\u5e8f\uff0c\u4ee5\u4f7f\u7528\u6211\u4eec\u7684\u96c6\u5408\u548c\u8fed\u4ee3\u5668\u904d\u5386\u901a\u9053\u96c6\u5408\u3002IteratorPatternTest.java<\/p>\n
package com.Olivia.design.iterator;\r\n\r\npublic class IteratorPatternTest {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tChannelCollection channels = populateChannels();\r\n\t\tChannelIterator baseIterator = channels.iterator(ChannelTypeEnum.ALL);\r\n\t\twhile (baseIterator.hasNext()) {\r\n\t\t\tChannel c = baseIterator.next();\r\n\t\t\tSystem.out.println(c.toString());\r\n\t\t}\r\n\t\tSystem.out.println(\"******\");\r\n\t\t\/\/ Channel Type Iterator\r\n\t\tChannelIterator englishIterator = channels.iterator(ChannelTypeEnum.ENGLISH);\r\n\t\twhile (englishIterator.hasNext()) {\r\n\t\t\tChannel c = englishIterator.next();\r\n\t\t\tSystem.out.println(c.toString());\r\n\t\t}\r\n\t}\r\n\r\n\tprivate static ChannelCollection populateChannels() {\r\n\t\tChannelCollection channels = new ChannelCollectionImpl();\r\n\t\tchannels.addChannel(new Channel(98.5, ChannelTypeEnum.ENGLISH));\r\n\t\tchannels.addChannel(new Channel(99.5, ChannelTypeEnum.HINDI));\r\n\t\tchannels.addChannel(new Channel(100.5, ChannelTypeEnum.FRENCH));\r\n\t\tchannels.addChannel(new Channel(101.5, ChannelTypeEnum.ENGLISH));\r\n\t\tchannels.addChannel(new Channel(102.5, ChannelTypeEnum.HINDI));\r\n\t\tchannels.addChannel(new Channel(103.5, ChannelTypeEnum.FRENCH));\r\n\t\tchannels.addChannel(new Channel(104.5, ChannelTypeEnum.ENGLISH));\r\n\t\tchannels.addChannel(new Channel(105.5, ChannelTypeEnum.HINDI));\r\n\t\tchannels.addChannel(new Channel(106.5, ChannelTypeEnum.FRENCH));\r\n\t\treturn channels;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
\u5f53\u6211\u8fd0\u884c\u4e0a\u8ff0\u7a0b\u5e8f\u65f6\uff0c\u5b83\u4ea7\u751f\u4e86\u4ee5\u4e0b\u8f93\u51fa\uff1b<\/p>\n
Frequency=98.5, Type=ENGLISH\r\nFrequency=99.5, Type=HINDI\r\nFrequency=100.5, Type=FRENCH\r\nFrequency=101.5, Type=ENGLISH\r\nFrequency=102.5, Type=HINDI\r\nFrequency=103.5, Type=FRENCH\r\nFrequency=104.5, Type=ENGLISH\r\nFrequency=105.5, Type=HINDI\r\nFrequency=106.5, Type=FRENCH\r\n******\r\nFrequency=98.5, Type=ENGLISH\r\nFrequency=101.5, Type=ENGLISH\r\nFrequency=104.5, Type=ENGLISH\r\n<\/code><\/pre>\n
\u8fed\u4ee3\u5668\u8bbe\u8ba1\u6a21\u5f0f\u7684\u91cd\u8981\u8981\u70b9\u3002<\/h3>\n
    \n
  • \u5f53\u4f60\u60f3\u8981\u63d0\u4f9b\u4e00\u79cd\u6807\u51c6\u65b9\u6cd5\u6765\u904d\u5386\u96c6\u5408\u5e76\u5411\u5ba2\u6237\u7aef\u7a0b\u5e8f\u9690\u85cf\u5b9e\u73b0\u903b\u8f91\u65f6\uff0c\u8fed\u4ee3\u5668\u6a21\u5f0f\u975e\u5e38\u6709\u7528\u3002<\/li>\n
  • \u8fed\u4ee3\u7684\u903b\u8f91\u5d4c\u5165\u5728\u96c6\u5408\u672c\u8eab\u4e2d\uff0c\u8fd9\u6709\u52a9\u4e8e\u5ba2\u6237\u7aef\u7a0b\u5e8f\u8f7b\u677e\u5730\u904d\u5386\u5b83\u4eec\u3002<\/li>\n<\/ul>\n
    JDK\u4e2d\u7684\u8fed\u4ee3\u5668\u8bbe\u8ba1\u6a21\u5f0f\u3002<\/h3>\n
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