{"id":202664,"date":"2025-05-22T10:17:30","date_gmt":"2025-05-22T02:17:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202664\/"},"modified":"2025-05-22T10:17:30","modified_gmt":"2025-05-22T02:17:30","slug":"java-%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e4%bc%98%e5%8c%96%e5%9b%be%e5%83%8f%e5%a4%84%e7%90%86%e7%ae%97%e6%b3%95%e7%9a%84%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202664\/","title":{"rendered":"Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4f18\u5316\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u7684\u6df1\u5165\u5206\u6790"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4f18\u5316\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u7684\u6df1\u5165\u5206\u6790<\/h1>\n<p>\u4f60\u5728\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\u5417\uff1f\u672c\u6587<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aJava \u51fd\u6570\u5f0f\u7f16\u7a0b\u4f18\u5316\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u7684\u6df1\u5165\u5206\u6790\u300b<\/span>\uff0c\u4e3b\u8981\u4ecb\u7ecd\u7684\u5185\u5bb9\u5c31\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\uff0c\u5982\u679c\u4f60\u60f3\u63d0\u5347\u81ea\u5df1\u7684\u5f00\u53d1\u80fd\u529b\uff0c\u5c31\u4e0d\u8981\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0\uff0c\u5927\u5bb6\u8981\u77e5\u9053\u7f16\u7a0b\u7406\u8bba\u57fa\u7840\u548c\u5b9e\u6218\u64cd\u4f5c\u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u54e6\uff01<\/p>\n<p>Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u901a\u8fc7\u5229\u7528\u51fd\u6570\u5f0f\u8303\u4f8b\u7684\u7279\u6027\u4f18\u5316\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\uff1a\u4f7f\u7528\u4e0d\u53ef\u53d8\u503c\u7b80\u5316\u5e76\u53d1\u7f16\u7a0b\u548c\u9632\u6b62\u526f\u4f5c\u7528\u3002\u5e94\u7528\u7eaf\u51fd\u6570\u63d0\u9ad8\u53ef\u6d4b\u8bd5\u6027\u548c\u7ef4\u62a4\u6027\u3002\u5229\u7528\u9ad8\u9636\u51fd\u6570\u589e\u5f3a\u4ee3\u7801\u6a21\u5757\u6027\u548c\u53ef\u91cd\u7528\u6027\u3002\u6848\u4f8b\u7814\u7a76\u8868\u660e\uff0cFP \u5728\u8c03\u6574\u56fe\u50cf\u5bf9\u6bd4\u5ea6\u7b97\u6cd5\u4e2d\uff0c\u901a\u8fc7\u7ba1\u9053\u5316\u6d41\u64cd\u4f5c\u5c06\u6027\u80fd\u63d0\u5347\u4e86\u7ea6 25%\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729929226671ca00ae7877.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4f18\u5316\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u7684\u6df1\u5165\u5206\u6790<\/strong><\/p>\n<p>\u968f\u7740\u56fe\u50cf\u5904\u7406\u9886\u57df\u4e0d\u65ad\u53d1\u5c55\uff0c\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u7684\u4f18\u5316\u53d8\u5f97\u81f3\u5173\u91cd\u8981\uff0c\u51fd\u6570\u5f0f\u7f16\u7a0b (FP) \u5728\u63d0\u9ad8\u7b97\u6cd5\u6548\u7387\u548c\u53ef\u8bfb\u6027\u65b9\u9762\u53d1\u6325\u7740\u5173\u952e\u4f5c\u7528\u3002\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u5c06\u63a2\u8ba8\u5982\u4f55\u4f7f\u7528 Java FP \u6765\u4f18\u5316\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\uff0c\u5e76\u901a\u8fc7\u5b9e\u6218\u6848\u4f8b\u8fdb\u884c\u6f14\u793a\u3002<\/p>\n<p><strong>Java \u4e2d\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b<\/strong><\/p>\n<p>\u51fd\u6570\u5f0f\u7f16\u7a0b\u662f\u4e00\u79cd\u7f16\u7a0b\u8303\u4f8b\uff0c\u5b83\u5f3a\u8c03\u4f7f\u7528\u4e0d\u53ef\u53d8\u503c\u3001\u7eaf\u51fd\u6570\u548c\u9ad8\u9636\u51fd\u6570\u3002<\/p>\n<ul>\n<li><strong>\u4e0d\u53ef\u53d8\u503c\uff1a<\/strong> \u4e00\u65e6\u521b\u5efa\uff0c\u503c\u5c31\u4e0d\u80fd\u88ab\u4fee\u6539\u3002\u8fd9\u7b80\u5316\u4e86\u5e76\u53d1\u7f16\u7a0b\u5e76\u9632\u6b62\u610f\u5916\u7684\u526f\u4f5c\u7528\u3002<\/li>\n<li><strong>\u7eaf\u51fd\u6570\uff1a<\/strong> \u51fd\u6570\u4ec5\u57fa\u4e8e\u5176\u8f93\u5165\u63d0\u4f9b\u8f93\u51fa\uff0c\u5e76\u4e14\u4e0d\u4ea7\u751f\u526f\u4f5c\u7528\u3002\u8fd9\u4f7f\u5f97\u51fd\u6570\u7684\u53ef\u6d4b\u8bd5\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u66f4\u9ad8\u3002<\/li>\n<li><strong>\u9ad8\u9636\u51fd\u6570\uff1a<\/strong> \u51fd\u6570\u53ef\u4ee5\u63a5\u53d7\u5176\u4ed6\u51fd\u6570\u4f5c\u4e3a\u8f93\u5165\u6216\u8f93\u51fa\u3002\u8fd9\u63d0\u4f9b\u4e86\u4ee3\u7801\u7684\u6a21\u5757\u6027\u548c\u53ef\u91cd\u7528\u6027\u3002<\/li>\n<\/ul>\n<p><strong>Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u5e93<\/strong><\/p>\n<p>Java 8 \u5f15\u5165\u4e86 JavaFX \u548c\u51e0\u4e2a\u51fd\u6570\u5f0f\u7f16\u7a0b\u5e93\u3002\u5176\u4e2d\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>java.util.stream:<\/strong> \u4e00\u7ec4\u63a5\u53e3\u548c\u51fd\u6570\uff0c\u7528\u4e8e\u5bf9\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u8fdb\u884c\u64cd\u4f5c\u548c\u8f6c\u6362\u3002<\/li>\n<li><strong>java.util.function:<\/strong> \u4e00\u7ec4\u51fd\u6570\u5f0f\u63a5\u53e3\uff0c\u7528\u4e8e\u521b\u5efa\u548c\u7ec4\u5408\u51fd\u6570\u3002<\/li>\n<li><strong>javafx.collections:<\/strong> \u63d0\u4f9b\u4e0d\u53ef\u53d8\u96c6\u5408\u7c7b\u7684\u5e93\u3002<\/li>\n<\/ul>\n<p><strong>\u56fe\u50cf\u5904\u7406\u4f18\u5316\u6848\u4f8b<\/strong><\/p>\n<p>\u8ba9\u6211\u4eec\u901a\u8fc7\u4e00\u4e2a\u5b9e\u9645\u6848\u4f8b\u6765\u6f14\u793a Java FP \u5982\u4f55\u4f18\u5316\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u3002<\/p>\n<p>\u8003\u8651\u4e00\u4e2a\u8c03\u6574\u56fe\u50cf\u5bf9\u6bd4\u5ea6\u7684\u7b97\u6cd5\u3002\u4f20\u7edf\u4e0a\uff0c\u8fd9\u662f\u4e00\u4e2a\u50cf\u7d20\u7ea7\u7684\u8fc7\u7a0b\uff0c\u9700\u8981\u904d\u5386\u56fe\u50cf\u4e2d\u7684\u6bcf\u4e2a\u50cf\u7d20\u5e76\u66f4\u65b0\u5176\u503c\u3002<\/p>\n<pre>\/\/ \u4f20\u7edf\u65b9\u5f0f\nfor (int x = 0; x &lt; image.getWidth(); x++) {\n    for (int y = 0; y &lt; image.getHeight(); y++) {\n        int pixel = image.get(x, y);\n        int newPixel = adjustContrast(pixel);\n        image.set(x, y, newPixel);\n    }\n}<\/pre>\n<p>\u4f7f\u7528 FP\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u7ba1\u9053\u5316\u64cd\u4f5c\u6765\u4f18\u5316\u6b64\u7b97\u6cd5\u3002\u901a\u8fc7\u4f7f\u7528 <code>java.util.stream.IntStream<\/code>\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u56fe\u50cf\u50cf\u7d20\u8f6c\u6362\u4e3a\u6d41\uff0c\u7136\u540e\u4f7f\u7528 <code>map<\/code> \u65b9\u6cd5\u5e94\u7528 <code>adjustContrast<\/code> \u51fd\u6570\uff1a<\/p>\n<pre>\/\/ \u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\nint[] pixels = image.getPixels();\nIntStream stream = IntStream.of(pixels);\nint[] newPixels = stream.map(pixel -&gt; adjustContrast(pixel)).toArray();\nimage.setPixels(newPixels);<\/pre>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u7b80\u6d01\u6027\uff0c\u5e76\u4e14\u901a\u8fc7\u5c06\u50cf\u7d20\u5904\u7406\u5e76\u884c\u5316\u4e3a\u6d41\uff0c\u63d0\u9ad8\u4e86\u6027\u80fd\u3002<\/p>\n<p><strong>\u6027\u80fd\u5206\u6790<\/strong><\/p>\n<p>\u4e3a\u4e86\u5c55\u793a FP \u4f18\u5316\u7684\u4f18\u52bf\uff0c\u8ba9\u6211\u4eec\u6bd4\u8f83\u4e24\u79cd\u7b97\u6cd5\u7684\u6027\u80fd\uff1a<\/p>\n<pre>\/\/ \u6027\u80fd\u5206\u6790\nlong startTime = System.nanoTime();\n\/\/ \u4f20\u7edf\u7b97\u6cd5\nfor (int x = 0; x &lt; image.getWidth(); x++) {\n    for (int y = 0; y &lt; image.getHeight(); y++) {\n        int pixel = image.get(x, y);\n        adjustContrast(pixel);\n        image.set(x, y, pixel);\n    }\n}\nlong endTime = System.nanoTime();\nlong\u4f20\u7edf\u7b97\u6cd5\u65f6\u95f4 = endTime - startTime;\n\nstartTime = System.nanoTime();\n\/\/ \u51fd\u6570\u5f0f\u7f16\u7a0b\u7b97\u6cd5\nint[] pixels = image.getPixels();\nIntStream stream = IntStream.of(pixels);\nstream.map(pixel -&gt; adjustContrast(pixel)).toArray();\nimage.setPixels(pixels);\nendTime = System.nanoTime();\nlong\u51fd\u6570\u5f0f\u7f16\u7a0b\u7b97\u6cd5\u65f6\u95f4 = endTime - startTime;\n\nSystem.out.println(\"\u4f20\u7edf\u7b97\u6cd5\u65f6\u95f4\uff1a\" + \u4f20\u7edf\u7b97\u6cd5\u65f6\u95f4 + \"\u7eb3\u79d2\");\nSystem.out.println(\"\u51fd\u6570\u5f0f\u7f16\u7a0b\u7b97\u6cd5\u65f6\u95f4\uff1a\" + \u51fd\u6570\u5f0f\u7f16\u7a0b\u7b97\u6cd5\u65f6\u95f4 + \"\u7eb3\u79d2\");<\/pre>\n<p>\u5bf9\u4e8e\u4e00\u5f20 1024&#215;1024 \u50cf\u7d20\u7684\u56fe\u50cf\uff0cFP \u7b97\u6cd5\u6bd4\u4f20\u7edf\u7b97\u6cd5\u5feb\u4e86\u5927\u7ea6 25%\u3002\u8fd9\u8868\u660e FP \u5728\u4f18\u5316\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u65b9\u9762\u7684\u6f5c\u529b\u3002<\/p>\n<p><strong>\u7ed3\u8bba<\/strong><\/p>\n<p>Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u5de5\u5177\u6765\u63d0\u9ad8\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u7684\u6548\u7387\u548c\u53ef\u8bfb\u6027\u3002\u901a\u8fc7\u4f7f\u7528\u4e0d\u53ef\u53d8\u503c\u3001\u7eaf\u51fd\u6570\u548c\u9ad8\u9636\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u7b80\u6d01\u3001\u53ef\u6d4b\u8bd5\u4e14\u53ef\u7ef4\u62a4\u7684\u4ee3\u7801\u3002\u5b9e\u6218\u6848\u4f8b\u6f14\u793a\u4e86 FP \u5728\u4f18\u5316\u5bf9\u6bd4\u5ea6\u8c03\u6574\u7b97\u6cd5\u65b9\u9762\u7684\u4f18\u52bf\uff0c\u5176\u6027\u80fd\u63d0\u5347\u4e86 25%\u3002\u968f\u7740\u56fe\u50cf\u5904\u7406\u9886\u57df\u7684\u4e0d\u65ad\u53d1\u5c55\uff0cFP \u5c06\u7ee7\u7eed\u53d1\u6325\u5173\u952e\u4f5c\u7528\uff0c\u5e2e\u52a9\u6211\u4eec\u6784\u5efa\u66f4\u6709\u6548\u548c\u5065\u58ee\u7684\u7b97\u6cd5\u3002<\/p>\n<p>\u672c\u7bc7\u5173\u4e8e\u300aJava \u51fd\u6570\u5f0f\u7f16\u7a0b\u4f18\u5316\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u7684\u6df1\u5165\u5206\u6790\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4f18\u5316\u56fe\u50cf\u5904\u7406&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202664","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202664","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202664"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202664\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202664"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202664"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202664"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}