{"id":538,"date":"2021-02-03T10:47:45","date_gmt":"2021-02-03T02:47:45","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/java\/?p=538"},"modified":"2021-02-04T11:45:02","modified_gmt":"2021-02-04T03:45:02","slug":"collection-%e6%8e%a5%e5%8f%a3","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/java\/post-538.html","title":{"rendered":"Collection \u63a5\u53e3"},"content":{"rendered":"\n<p>Collection \u662f\u5355\u5217\u96c6\u5408\u7684\u6839\u7c7b\uff0c\u5b9a\u4e49\u4e86\u4e00\u4e9b\u5355\u5217\u96c6\u5408\u7684\u901a\u7528\u65b9\u6cd5<\/p>\n\n\n\n<h5>1.\u5bfc\u5305<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Collection;<\/code><\/pre>\n\n\n\n<h5>2.\u6784\u9020\u65b9\u6cd5<\/h5>\n\n\n\n<p>\u65e0\u6cd5\u76f4\u63a5\u6784\u9020\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u6001\u65b9\u5f0f<\/p>\n\n\n\n<p>&lt;E&gt; \u4ee3\u8868\u6cdb\u578b\uff0c\u5373\u968f\u4fbf\u6307\u5b9a\u4e00\u79cd\u7c7b\u578b\uff0c\u4f46\u5fc5\u987b\u662f\u5f15\u7528\u7c7b\u578b<\/p>\n\n\n\n<p>\u540e\u9762\u7684\u5c16\u62ec\u53f7\u5185\u5bb9\uff0c\u5728jdk1.7\u4e4b\u540e\u53ef\u4ee5\u7701\u7565\uff0c\u5426\u5219\u548c\u524d\u9762\u5c16\u62ec\u53f7\u5185\u5bb9\u4e00\u81f4<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Collection&lt;String&gt; coll = new ArrayList&lt;&gt;();<\/code><\/pre>\n\n\n\n<h5>3.\u65b9\u6cd5<\/h5>\n\n\n\n<p>1.\u6dfb\u52a0\u5143\u7d20<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>coll.add(\"hello\");\ncoll.add(\"world\");\ncoll.add(\"java\");\nSystem.out.println(coll);<\/code><\/pre>\n\n\n\n<p>2.\u5220\u9664\u5143\u7d20<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>boolean result1 = coll.remove(\"hello2\");\nSystem.out.println(\"\u7b2c\u4e00\u6b21\u5220\u9664\u662f\u5426\u6210\u529f\uff1a\"+result1);\nboolean result2 = coll.remove(\"hello\");\nSystem.out.println(\"\u7b2c\u4e8c\u6b21\u5220\u9664\u662f\u5426\u6210\u529f\uff1a\"+result2);<\/code><\/pre>\n\n\n\n<p>3.\u6e05\u7a7a\u5168\u90e8\u5143\u7d20<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>System.out.println(\"\u6e05\u7a7a\u524d\u7684\u96c6\u5408\"+coll);\ncoll.clear();\nSystem.out.println(\"\u6e05\u7a7a\u540e\u7684\u96c6\u5408\"+coll);<\/code><\/pre>\n\n\n\n<p>4.\u5224\u65ad\u662f\u5426\u5305\u542b\u67d0\u4e2a\u5143\u7d20<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>boolean result3 = coll.contains(\"java\");\nSystem.out.println(\"\u662f\u5426\u5305\u542bjava\"+result3);<\/code><\/pre>\n\n\n\n<p>5.\u5224\u65ad\u96c6\u5408\u4e3a\u7a7a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>System.out.println(\"\u96c6\u5408\u662f\u5426\u4e3a\u7a7a\"+coll.isEmpty());\ncoll.clear(); \/\/\u6e05\u7a7a\u96c6\u5408\nSystem.out.println(\"\u96c6\u5408\u662f\u5426\u4e3a\u7a7a\"+coll.isEmpty());<\/code><\/pre>\n\n\n\n<p>6.\u83b7\u53d6\u96c6\u5408\u7684\u957f\u5ea6<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>System.out.println(\"\u96c6\u5408\u7684\u957f\u5ea6\"+coll.size());<\/code><\/pre>\n\n\n\n<p>7.\u96c6\u5408\u8f6c\u5316\u4e3a\u6570\u7ec4<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Object&#91;] objs = coll.toArray();\nSystem.out.println(Arrays.toString(objs));<\/code><\/pre>\n\n\n\n<h5>4.\u6ce8\u610f\u4e8b\u9879<\/h5>\n\n\n\n<p>Collection \u63a5\u53e3\u7684\u552f\u4e00\u76f4\u63a5\u5b9e\u73b0\u7c7b\u662f AbstractCollection\uff0c<\/p>\n\n\n\n<p>\u8be5\u62bd\u8c61\u7c7b\u4e2d\u63d0\u4f9b\u4e86\u5f88\u591a\u5171\u6027\u65b9\u6cd5\uff0c\u5e76\u91cd\u5199\u4e86 toString()\u65b9\u6cd5<\/p>\n\n\n\n<p>\u76f4\u63a5\u6253\u5370 Collection \u53ca\u5176\u5b50\u7c7b\u7684\u96c6\u5408\u65f6\uff0c\u548c\u6570\u7ec4\u663e\u793a\u76f8\u540c\uff0c\u4e3a\u7a7a\u65f6\u663e\u793a []<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Collection \u662f\u5355\u5217\u96c6\u5408\u7684\u6839\u7c7b\uff0c\u5b9a\u4e49\u4e86\u4e00\u4e9b\u5355\u5217\u96c6\u5408\u7684\u901a\u7528\u65b9\u6cd5 1.\u5bfc\u5305 2.\u6784\u9020\u65b9\u6cd5 \u65e0\u6cd5\u76f4\u63a5\u6784\u9020\uff0c\u53ef&hellip; <a href=\"https:\/\/www.52dixiaowo.com\/java\/post-538.html\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">Collection \u63a5\u53e3<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/538"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/comments?post=538"}],"version-history":[{"count":0,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/538\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/media?parent=538"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/categories?post=538"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/tags?post=538"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}