{"id":37704,"date":"2024-11-26T10:36:44","date_gmt":"2024-11-26T02:36:44","guid":{"rendered":"https:\/\/fwq.ai\/blog\/37704\/"},"modified":"2024-11-26T10:36:44","modified_gmt":"2024-11-26T02:36:44","slug":"java%e6%80%8e%e4%b9%88%e9%81%8d%e5%8e%86%e6%95%b0%e7%bb%846","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/37704\/","title":{"rendered":"java\u600e\u4e48\u904d\u5386\u6570\u7ec46"},"content":{"rendered":"<blockquote><p>\n  \u7b54\u6848\uff1a java \u904d\u5386\u6570\u7ec4\u6709\u56db\u79cd\u65b9\u6cd5\uff1afor \u5faa\u73af\u3001foreach \u5faa\u73af\u3001java 8 stream \u548c\u8fed\u4ee3\u5668\u3002for \u5faa\u73af\uff1a \u904d\u5386\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u6309\u987a\u5e8f\u6267\u884c\u4ee3\u7801\u5757\u3002foreach \u5faa\u73af\uff1a \u7b80\u5316\u7248 for \u5faa\u73af\uff0c\u7528\u4e8e\u904d\u5386\u6570\u7ec4\u6216\u96c6\u5408\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u3002java 8 stream\uff1a \u63d0\u4f9b\u7075\u6d3b\u7b80\u6d01\u7684\u904d\u5386\u65b9\u5f0f\uff0c\u652f\u6301\u5e76\u884c\u5904\u7406\u3002\u8fed\u4ee3\u5668\uff1a \u5141\u8bb8\u60a8\u4ece\u6570\u7ec4\u4e2d\u83b7\u53d6\u8fed\u4ee3\u5668\uff0c\u5e76\u9010\u4e2a\u8bbf\u95ee\u5143\u7d20\uff0c\u53ef\u7528\u4e8e\u5728\u904d\u5386\u65f6\u4fee\u6539\u6570\u7ec4\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/13\/2024111309124330578.jpg\" class=\"aligncenter\" title=\"java\u600e\u4e48\u904d\u5386\u6570\u7ec46\u63d2\u56fe\" alt=\"java\u600e\u4e48\u904d\u5386\u6570\u7ec46\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u4f7f\u7528 Java \u904d\u5386\u6570\u7ec4<\/strong><\/p>\n<p>\u904d\u5386\u6570\u7ec4\u662f Java \u4e2d\u4e00\u9879\u57fa\u672c\u64cd\u4f5c\uff0c\u53ef\u4ee5\u5e2e\u52a9\u60a8\u8bbf\u95ee\u548c\u5904\u7406\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u3002\u6709\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u904d\u5386\u6570\u7ec4\uff0c\u5177\u4f53\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u60a8\u7684\u7279\u5b9a\u9700\u6c42\u3002<\/p>\n<p><strong>\u4f7f\u7528 for \u5faa\u73af<\/strong><\/p>\n<p>for \u5faa\u73af\u662f\u6700\u5e38\u89c1\u7528\u4e8e\u904d\u5386\u6570\u7ec4\u7684\u65b9\u6cd5\u3002\u5b83\u5141\u8bb8\u60a8\u5728\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u4e0a\u4f9d\u6b21\u6267\u884c\u4ee3\u7801\u5757\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>for (int i = 0; i &lt; arr.length; i++) {\n    \/\/ \u4ee3\u7801\u5757\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0carr \u662f\u8981\u904d\u5386\u7684\u6570\u7ec4\uff0ci \u662f\u5faa\u73af\u53d8\u91cf\uff0carr.length \u662f\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/p>\n<p><strong>\u4f7f\u7528 foreach \u5faa\u73af<\/strong><\/p>\n<p>foreach \u5faa\u73af\u662f for \u5faa\u73af\u7684\u7b80\u5316\u7248\u672c\uff0c\u5b83\u7528\u4e8e\u904d\u5386\u6570\u7ec4\u6216\u96c6\u5408\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre>for (int element : arr) {\n    \/\/ \u4ee3\u7801\u5757\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0celement \u662f\u6570\u7ec4\u4e2d\u7684\u5f53\u524d\u5143\u7d20\u3002<\/p>\n<p><strong>\u4f7f\u7528 Java 8 Stream<\/strong><\/p>\n<p>Java 8 \u4e2d\u5f15\u5165\u4e86 Stream\uff0c\u53ef\u4ee5\u63d0\u4f9b\u66f4\u7075\u6d3b\u548c\u7b80\u6d01\u7684\u904d\u5386\u65b9\u5f0f\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre>Arrays.stream(arr)\n    .forEach(element -&gt; {\n        \/\/ \u4ee3\u7801\u5757\n    });<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cArrays.stream(arr) \u521b\u5efa\u4e00\u4e2a\u6570\u7ec4\u7684 Stream\uff0c\u7136\u540e\u4f7f\u7528 forEach \u65b9\u6cd5\u5bf9 Stream \u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u6267\u884c\u4ee3\u7801\u5757\u3002<\/p>\n<p><strong>\u4f7f\u7528\u8fed\u4ee3\u5668<\/strong><\/p>\n<p>\u8fed\u4ee3\u5668\u662f\u4e00\u79cd\u904d\u5386\u96c6\u5408\u6216\u6570\u7ec4\u7684\u63a5\u53e3\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528 Iterator \u63a5\u53e3\u4ece\u6570\u7ec4\u4e2d\u83b7\u53d6\u8fed\u4ee3\u5668\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre>Iterator&lt;Integer&gt; it = Arrays.asList(arr).iterator();\nwhile (it.hasNext()) {\n    int element = it.next();\n    \/\/ \u4ee3\u7801\u5757\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cArrays.asList(arr) \u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a\u4e00\u4e2a List\uff0c\u7136\u540e\u4f7f\u7528 iterator() \u65b9\u6cd5\u83b7\u53d6\u8fed\u4ee3\u5668\u3002hasNext() \u65b9\u6cd5\u68c0\u67e5\u662f\u5426\u6709\u4e0b\u4e00\u4e2a\u5143\u7d20\uff0cnext() \u65b9\u6cd5\u8fd4\u56de\u4e0b\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n<p><strong>\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5<\/strong><\/p>\n<p>\u9009\u62e9\u54ea\u79cd\u904d\u5386\u6570\u7ec4\u7684\u65b9\u6cd5\u53d6\u51b3\u4e8e\u60a8\u7684\u7279\u5b9a\u9700\u6c42\u3002<\/p>\n<ul>\n<li> <strong>\u9700\u8981\u987a\u5e8f\u8bbf\u95ee\u5143\u7d20\uff1a<\/strong>\u4f7f\u7528 for \u5faa\u73af\u6216 foreach \u5faa\u73af\u3002<\/li>\n<li> <strong>\u9700\u8981\u5e76\u884c\u5904\u7406\u5143\u7d20\uff1a<\/strong>\u4f7f\u7528 Java 8 Stream\u3002<\/li>\n<li> <strong>\u9700\u8981\u5728\u904d\u5386\u65f6\u4fee\u6539\u6570\u7ec4\uff1a<\/strong>\u4f7f\u7528\u8fed\u4ee3\u5668\u3002<\/li>\n<\/ul>\n<p>\u901a\u8fc7\u7406\u89e3\u8fd9\u4e9b\u9009\u9879\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u904d\u5386 Java \u4e2d\u7684\u6570\u7ec4\u5e76\u6267\u884c\u6240\u9700\u7684\u5904\u7406\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u904d\u5386\u6570\u7ec46\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7b54\u6848\uff1a java \u904d\u5386\u6570\u7ec4\u6709\u56db\u79cd\u65b9\u6cd5\uff1afor \u5faa\u73af\u3001foreach \u5faa\u73af\u3001java 8 stream \u548c\u8fed\u4ee3\u5668\u3002for \u5faa\u73af\uff1a \u904d\u5386\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u6309\u987a\u5e8f\u6267\u884c\u4ee3\u7801\u5757\u3002foreach \u5faa\u73af\uff1a \u7b80\u5316\u7248 for \u5faa\u73af\uff0c\u7528\u4e8e\u904d\u5386\u6570\u7ec4\u6216\u96c6\u5408\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u3002java 8 stream\uff1a \u63d0\u4f9b\u7075\u6d3b\u7b80\u6d01\u7684\u904d\u5386\u65b9\u5f0f\uff0c\u652f\u6301\u5e76\u884c\u5904\u7406\u3002\u8fed\u4ee3\u5668\uff1a \u5141\u8bb8\u60a8\u4ece\u6570\u7ec4\u4e2d\u83b7\u53d6\u8fed\u4ee3\u5668\uff0c\u5e76\u9010\u4e2a\u8bbf\u95ee\u5143\u7d20\uff0c\u53ef\u7528\u4e8e\u5728\u904d\u5386\u65f6\u4fee\u6539\u6570\u7ec4\u3002 \u5982\u4f55\u4f7f\u7528 Java \u904d\u5386\u6570\u7ec4 \u904d\u5386\u6570\u7ec4\u662f Java \u4e2d\u4e00\u9879\u57fa\u672c\u64cd\u4f5c\uff0c\u53ef\u4ee5\u5e2e\u52a9\u60a8\u8bbf\u95ee\u548c\u5904\u7406\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u3002\u6709\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u904d\u5386\u6570\u7ec4\uff0c\u5177\u4f53\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u60a8\u7684\u7279\u5b9a\u9700\u6c42\u3002 \u4f7f\u7528 for \u5faa\u73af for \u5faa\u73af\u662f\u6700\u5e38\u89c1\u7528\u4e8e\u904d\u5386\u6570\u7ec4\u7684\u65b9\u6cd5\u3002\u5b83\u5141\u8bb8\u60a8\u5728\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u4e0a\u4f9d\u6b21\u6267\u884c\u4ee3\u7801\u5757\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b for (int i = 0; i &lt; arr.length; i++) { \/\/ \u4ee3\u7801\u5757 } \u767b\u5f55\u540e\u590d\u5236 \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0carr \u662f\u8981\u904d\u5386\u7684\u6570\u7ec4\uff0ci \u662f\u5faa\u73af\u53d8\u91cf\uff0carr.length \u662f\u6570\u7ec4\u7684\u957f\u5ea6\u3002 \u4f7f\u7528 foreach \u5faa\u73af foreach \u5faa\u73af\u662f for \u5faa\u73af\u7684\u7b80\u5316\u7248\u672c\uff0c\u5b83\u7528\u4e8e\u904d\u5386\u6570\u7ec4\u6216\u96c6\u5408\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-37704","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/37704","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=37704"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/37704\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=37704"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=37704"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=37704"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}