{"id":36044,"date":"2024-11-26T09:04:58","date_gmt":"2024-11-26T01:04:58","guid":{"rendered":"https:\/\/fwq.ai\/blog\/36044\/"},"modified":"2024-11-26T09:04:58","modified_gmt":"2024-11-26T01:04:58","slug":"java-stream-%e6%b3%9b%e5%9e%8b%e4%b8%8d%e5%a1%ab%e4%bc%9a%e5%b8%a6%e6%9d%a5%e4%bb%80%e4%b9%88%e9%97%ae%e9%a2%98%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/36044\/","title":{"rendered":"Java Stream \u6cdb\u578b\u4e0d\u586b\u4f1a\u5e26\u6765\u4ec0\u4e48\u95ee\u9898\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173088550871313.jpg\" class=\"aligncenter\" title=\"Java Stream \u6cdb\u578b\u4e0d\u586b\u4f1a\u5e26\u6765\u4ec0\u4e48\u95ee\u9898\uff1f\u63d2\u56fe\" alt=\"Java Stream \u6cdb\u578b\u4e0d\u586b\u4f1a\u5e26\u6765\u4ec0\u4e48\u95ee\u9898\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>java stream\u6cdb\u578b\u4e0d\u586b\u5199\u5e26\u6765\u7684\u7c7b\u578b\u64e6\u9664<\/strong><\/p>\n<p>\u5728java\u4e2d\uff0c\u6cdb\u578b\u662f\u4e00\u79cd\u8bed\u6cd5\u7cd6\uff0c\u5728\u7f16\u8bd1\u65f6\u4fdd\u8bc1\u7c7b\u578b\u5b89\u5168\u3002\u5f53\u4f60\u5728\u58f0\u660e\u96c6\u5408\u65f6\u4e0d\u6307\u5b9a\u6cdb\u578b\uff0c\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u586b\u5145object\u7c7b\u578b\u3002\u8fd9\u5c06\u5bfc\u81f4\u7c7b\u578b\u64e6\u9664\u95ee\u9898\uff0c\u4e5f\u5c31\u662f\u64e6\u6389\u96c6\u5408\u4e2d\u5143\u7d20\u7684\u5177\u4f53\u7c7b\u578b\u3002<\/p>\n<p>\u5728\u63d0\u4f9b\u7684\u4ee3\u7801\u793a\u4f8b\u4e2d\uff1a<\/p>\n<pre>list list = new arraylist();\nlist.add(\"aaa\");\n\nlist.stream().map(a -&gt; a.tostring())\n        .filter(a -&gt; a);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<ul>\n<li> <strong>\u4e0d\u6307\u5b9a\u6cdb\u578b<\/strong>\uff1a\u7531\u4e8elist\u4e0d\u6307\u5b9a\u6cdb\u578b\uff0c\u7f16\u8bd1\u5668\u5c06\u5176\u89c6\u4e3alist\u3002 <\/li>\n<li> <strong>\u7c7b\u578b\u64e6\u9664<\/strong>\uff1a\u5728\u8fd0\u884c\u65f6\uff0c\u6cdb\u578b\u4fe1\u606f\u88ab\u64e6\u9664\u3002\u56e0\u6b64\uff0cmap\u548cfilter\u7b97\u5b50\u4e2d\u5904\u7406\u7684\u5143\u7d20\u90fd\u662fobject\u7c7b\u578b\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u95ee\u9898\uff0c\u56e0\u4e3a\u5728<strong>filter<\/strong>\u7b97\u5b50\u4e2d\u5224\u65ada\u662f\u5426\u4e3atrue\u65f6\uff0c\u4f1a\u5c06a\u4e0e\u5e03\u5c14\u503c\u6bd4\u8f83\uff0c\u800c\u4e0d\u662f\u5c06\u5176\u4f5c\u4e3a\u578b\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u5e94\u59cb\u7ec8\u5728\u58f0\u660e\u96c6\u5408\u65f6\u6307\u5b9a\u6cdb\u578b\uff1a<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>List&lt;String&gt; list = new ArrayList&lt;&gt;();<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u8fd9\u6837\uff0c\u7f16\u8bd1\u5668\u5c06\u786e\u4fdd\u96c6\u5408\u4e2d\u53ea\u80fd\u6dfb\u52a0string\u7c7b\u578b\u5143\u7d20\uff0c\u5e76\u4e14\u7c7b\u578b\u64e6\u9664\u5c31\u4e0d\u4f1a\u53d1\u751f\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fJava Stream \u6cdb\u578b\u4e0d\u586b\u4f1a\u5e26\u6765\u4ec0\u4e48\u95ee\u9898\uff1f\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>java stream\u6cdb\u578b\u4e0d\u586b\u5199\u5e26\u6765\u7684\u7c7b\u578b\u64e6\u9664 \u5728java\u4e2d\uff0c\u6cdb\u578b\u662f\u4e00\u79cd\u8bed\u6cd5\u7cd6\uff0c\u5728\u7f16\u8bd1\u65f6\u4fdd\u8bc1\u7c7b\u578b\u5b89\u5168\u3002\u5f53\u4f60\u5728\u58f0\u660e\u96c6\u5408\u65f6\u4e0d\u6307\u5b9a\u6cdb\u578b\uff0c\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u586b\u5145object\u7c7b\u578b\u3002\u8fd9\u5c06\u5bfc\u81f4\u7c7b\u578b\u64e6\u9664\u95ee\u9898\uff0c\u4e5f\u5c31\u662f\u64e6\u6389\u96c6\u5408\u4e2d\u5143\u7d20\u7684\u5177\u4f53\u7c7b\u578b\u3002 \u5728\u63d0\u4f9b\u7684\u4ee3\u7801\u793a\u4f8b\u4e2d\uff1a list list = new arraylist(); list.add(&#8220;aaa&#8221;); list.stream().map(a -&gt; a.tostring()) .filter(a -&gt; a); \u767b\u5f55\u540e\u590d\u5236 \u4e0d\u6307\u5b9a\u6cdb\u578b\uff1a\u7531\u4e8elist\u4e0d\u6307\u5b9a\u6cdb\u578b\uff0c\u7f16\u8bd1\u5668\u5c06\u5176\u89c6\u4e3alist\u3002 \u7c7b\u578b\u64e6\u9664\uff1a\u5728\u8fd0\u884c\u65f6\uff0c\u6cdb\u578b\u4fe1\u606f\u88ab\u64e6\u9664\u3002\u56e0\u6b64\uff0cmap\u548cfilter\u7b97\u5b50\u4e2d\u5904\u7406\u7684\u5143\u7d20\u90fd\u662fobject\u7c7b\u578b\u3002 \u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u95ee\u9898\uff0c\u56e0\u4e3a\u5728filter\u7b97\u5b50\u4e2d\u5224\u65ada\u662f\u5426\u4e3atrue\u65f6\uff0c\u4f1a\u5c06a\u4e0e\u5e03\u5c14\u503c\u6bd4\u8f83\uff0c\u800c\u4e0d\u662f\u5c06\u5176\u4f5c\u4e3a\u578b\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u5e94\u59cb\u7ec8\u5728\u58f0\u660e\u96c6\u5408\u65f6\u6307\u5b9a\u6cdb\u578b\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b List&lt;String&gt; list = new ArrayList&lt;&gt;(); \u767b\u5f55\u540e\u590d\u5236 \u8fd9\u6837\uff0c\u7f16\u8bd1\u5668\u5c06\u786e\u4fdd\u96c6\u5408\u4e2d\u53ea\u80fd\u6dfb\u52a0string\u7c7b\u578b\u5143\u7d20\uff0c\u5e76\u4e14\u7c7b\u578b\u64e6\u9664\u5c31\u4e0d\u4f1a\u53d1\u751f\u3002 \u4ee5\u4e0a\u5c31\u662fJava Stream \u6cdb\u578b\u4e0d\u586b\u4f1a\u5e26\u6765\u4ec0\u4e48\u95ee\u9898\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/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-36044","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/36044","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=36044"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/36044\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=36044"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=36044"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=36044"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}