{"id":2232,"date":"2023-05-07T06:27:59","date_gmt":"2023-05-06T22:27:59","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=2232"},"modified":"2023-05-07T06:28:06","modified_gmt":"2023-05-06T22:28:06","slug":"groovy-code-example-collect-method","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/05\/07\/groovy-code-example-collect-method\/","title":{"rendered":"Groovy\u4ee3\u7801\u793a\u4f8b &#8211; collect()\u65b9\u6cd5"},"content":{"rendered":"<h2>collect()\u65b9\u6cd5\u7684\u4f7f\u7528<\/h2>\n<p>Groovy\u7684<code>collect()<\/code>\u65b9\u6cd5\u7528\u4e8e\u904d\u5386\u96c6\u5408\u5bf9\u8c61\u5e76\u6267\u884c\u95ed\u5305\u3002\u672c\u6587\u5c06\u793a\u4f8b\u96c6\u5408\u5bf9\u8c61\u7684<code>collect()<\/code>\u65b9\u6cd5\u7684\u4f7f\u7528\u3002<\/p>\n<p><code>collect()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u63a5\u53d7\u9ed8\u8ba4\u7684\u95ed\u5305<code>Closure.IDENTITY<\/code>\u4f5c\u4e3a\u53c2\u6570\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u95ed\u5305(closure)\u4f5c\u4e3a\u53c2\u6570\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528\u96c6\u5408(collection)\u53ca\u95ed\u5305(closure)\u4f5c\u4e3a\u53c2\u6570\u3002<\/p>\n<pre><code class=\"language-java\">\/\/\u9ed8\u8ba4\u7684\u95ed\u5305\npublic List collect()\n\n\/\/\u95ed\u5305\u4f5c\u4e3a\u53c2\u6570\npublic List collect(Closure transform)\n\n\/\/\u96c6\u5408\u548c\u95ed\u5305\u4f5c\u4e3a\u53c2\u6570\npublic Collection collect(Collection collector, Closure transform)<\/code><\/pre>\n<p>\u4e0b\u9762\u770b\u4e00\u4e0b\u7b80\u5355collect()\u65b9\u6cd5\u7684\u5178\u578b\u5e94\u7528<\/p>\n<pre><code class=\"language-java\">\/\/\u5b9a\u4e49\u4e00\u4e2alist\ndef fruits = [&quot;Banana&quot;, &quot;Apple&quot;, &quot;Grape&quot;, &quot;Pear&quot;]\n\/\/it\u4e3a\u96c6\u5408\u4e2d\u7684\u6bcf\u4e2a\u5bf9\u8c61 \u5bf9\u4e8e\u6bcf\u4e2a\u5bf9\u8c61\u6267\u884ctoUpperCase()\u628a\u6240\u6709\u7684\u5bf9\u8c61\u53d8\u6210\u5927\u5199\ndef upperCaseFruits = fruits.collect { it.toUpperCase() }\nprintln upperCaseFruits \/\/ [BANANA, APPLE, GRAPE, PEAR]<\/code><\/pre>\n<h2>\u4f7f\u7528Collect()\u65b9\u6cd5\u904d\u5386\u5e76\u63d0\u4f9b\u521d\u59cb\u7684\u96c6\u5408\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570<\/h2>\n<p>\u6211\u4eec\u770b\u4e00\u4e0b\u5982\u4f55\u904d\u5386\u4e00\u4e2a\u96c6\u5408(fruits)\u4ee5\u53ca\u628a\u989d\u5916\u7684\u96c6\u5408(initialFruits)\u4f5c\u4e3acollect()\u65b9\u6cd5\u7684\u53c2\u6570\u5171\u540c\u904d\u5386\u3002<\/p>\n<pre><code class=\"language-java\">\/\/\u5b9a\u4e49\u989d\u5916\u7684\u96c6\u5408\ndef initialFruits = [&quot;Orange&quot;, &quot;Lemon&quot;]\n\/\/\u5b9a\u4e49\u8981\u904d\u5386\u7684\u96c6\u5408\ndef fruits = [&quot;Banana&quot;, &quot;Apple&quot;, &quot;Grape&quot;, &quot;Pear&quot;]\n\/\/\u6267\u884c\u904d\u5386\u4e0e\u95ed\u5305\ndef totalFruits = fruits.collect(initialFruits, { it.toUpperCase() })\n\n\/\/\u6267\u884c\u904d\u5386\u7684\u96c6\u5408\u6570\u636e\u6539\u53d8\nprintln totalFruits \/\/ [Orange, Lemon, BANANA, APPLE, GRAPE, PEAR]\n\/\/\u989d\u5916\u96c6\u5408\u7684\u6570\u636e\u540c\u6837\u6539\u53d8\nprintln initialFruits \/\/ [Orange, Lemon, BANANA, APPLE, GRAPE, PEAR]<\/code><\/pre>\n<p>\u63a5\u4e0b\u6765\u770b\u770b\u5982\u4f55\u904d\u5386\u96c6\u5408\u83b7\u5f97\u6ca1\u6709\u91cd\u590d\u503c\u7684\u96c6\u5408\u6570\u636e<\/p>\n<pre><code class=\"language-java\">\/\/\u5b9a\u4e49\u4e00\u4e2alist\uff0c\u6709\u91cd\u590d\u6570\u636eBanana\ndef fruits = [&quot;Banana&quot;, &quot;Apple&quot;, &quot;Grape&quot;, &quot;Pear&quot;, &quot;Banana&quot;]\n\/\/\u4f7f\u7528\u4e00\u4e2a\u7a7a\u7684HashSet\u4f5c\u4e3a\u904d\u5386\u53c2\u6570\u5e76\u6267\u884c\u95ed\u5305\ndef distinctFruits = fruits.collect(new HashSet(), { it })\n\n\/\/\u83b7\u5f97\u5230\u6ca1\u6709\u91cd\u590d\u6570\u636e\u7684\u96c6\u5408\nprintln distinctFruits \/\/ [Apple, Pear, Grape, Banana]<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>collect()\u65b9\u6cd5\u7684\u4f7f\u7528 Groovy\u7684collect()\u65b9\u6cd5\u7528\u4e8e\u904d\u5386\u96c6\u5408\u5bf9\u8c61\u5e76\u6267\u884c\u95ed\u5305\u3002\u672c\u6587\u5c06\u793a\u4f8b\u96c6\u5408\u5bf9 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[568],"tags":[],"class_list":["post-2232","post","type-post","status-publish","format-standard","hentry","category-groovy"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/2232","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=2232"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/2232\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=2232"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=2232"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=2232"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}