{"id":1177,"date":"2022-10-25T22:51:51","date_gmt":"2022-10-25T14:51:51","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1177"},"modified":"2022-11-27T12:39:49","modified_gmt":"2022-11-27T04:39:49","slug":"%e9%9b%86%e5%90%88-%e9%9b%86%e5%90%88%e6%a1%86%e6%9e%b6%e4%b8%8e%e9%a1%b9%e7%9b%ae%e7%9a%84%e5%af%b9%e6%af%94%e5%8f%8a%e6%a6%82%e8%bf%b0%e3%80%81%e9%9b%86%e5%90%88%e6%a1%86%e6%9e%b6%e6%b6%89%e5%8f%8a","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1177","title":{"rendered":"\u96c6\u5408-\u96c6\u5408\u6846\u67b6\u4e0e\u9879\u76ee\u7684\u5bf9\u6bd4\u53ca\u6982\u8ff0\u3001\u96c6\u5408\u6846\u67b6\u6d89\u53ca\u5230\u7684API\u3001Collection\u63a5\u53e3\u4e2d\u7684\u5e38\u7528\u65b9\u6cd51"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P513;\r\n\r\nimport org.junit.jupiter.api.Test;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.Collection;\r\nimport java.util.Date;\r\n\r\n\/**\r\n * \u4e00\u3001\u96c6\u5408\u6846\u67b6\u7684\u6982\u8ff0\r\n *\r\n * 1. \u96c6\u5408\u3001\u6570\u7ec4\u90fd\u662f\u5bf9\u591a\u4e2a\u6570\u636e\u8fdb\u884c\u5b58\u50a8\u64cd\u4f5c\u7684\u7ed3\u6784\uff0c\u7b80\u79f0Java\u5bb9\u5668\u3002\r\n *      \u8bf4\u660e\uff1a\u6b64\u65f6\u7684\u5b58\u50a8\uff0c\u4e3b\u8981\u6307\u7684\u662f\u5185\u5b58\u5c42\u9762\u7684\u5b58\u50a8\uff0c\u4e0d\u6d89\u53ca\u5230\u6301\u4e45\u5316\u7684\u5b58\u50a8\uff08.txt,.jpg,.avi, \u6570\u636e\u5e93\u4e2d\uff09\r\n *\r\n * 2.1 \u6570\u7ec4\u5728\u5b58\u50a8\u591a\u4e2a\u6570\u636e\u65b9\u9762\u7684\u7279\u70b9\uff1a\r\n *      > \u4e00\u65e6\u521d\u59cb\u5316\u4ee5\u540e\uff0c\u5176\u957f\u5ea6\u5c31\u786e\u5b9a\u4e86\u3002\r\n *      > \u6570\u7ec4\u4e00\u65e6\u5b9a\u4e49\u597d\uff0c\u5176\u5143\u7d20\u7684\u7c7b\u578b\u4e5f\u5c31\u786e\u5b9a\u4e86\u3002\u6211\u4eec\u4e5f\u5c31\u53ea\u80fd\u64cd\u4f5c\u6307\u5b9a\u7c7b\u578b\u7684\u6570\u636e\u4e86\u3002\r\n *          \u6bd4\u5982\uff1aString&#91;] arr; int&#91;] arr1; Object&#91;] arr2;\r\n * 2.2 \u6570\u7ec4\u5728\u5b58\u50a8\u591a\u4e2a\u6570\u636e\u65b9\u9762\u7684\u7f3a\u70b9\uff1a\r\n *      > \u4e00\u65e6\u521d\u59cb\u5316\u4ee5\u540e\uff0c\u5176\u957f\u5ea6\u5c31\u4e0d\u53ef\u4fee\u6539\u3002\r\n *      > \u6570\u7ec4\u4e2d\u63d0\u4f9b\u7684\u65b9\u6cd5\u975e\u5e38\u6709\u9650\uff0c\u5bf9\u4e8e\u6dfb\u52a0\u3001\u5220\u9664\u3001\u63d2\u5165\u6570\u636e\u7b49\u64cd\u4f5c\uff0c\u975e\u5e38\u4e0d\u4fbf\uff0c\u540c\u65f6\u6548\u7387\u4e0d\u9ad8\u3002\r\n *      > \u83b7\u53d6\u6570\u7ec4\u4e2d\u5b9e\u9645\u5143\u7d20\u7684\u4e2a\u6570\u7684\u9700\u6c42\uff0c\u6570\u7ec4\u6ca1\u6709\u73b0\u6210\u7684\u5c5e\u6027\u6216\u65b9\u6cd5\u53ef\u7528\r\n *      > \u6570\u7ec4\u5b58\u50a8\u6570\u636e\u7684\u7279\u70b9\uff1a\u6709\u5e8f\u3001\u53ef\u91cd\u590d\u3002\u5bf9\u4e8e\u65e0\u5e8f\u3001\u4e0d\u53ef\u91cd\u590d\u7684\u9700\u6c42\uff0c\u4e0d\u80fd\u6ee1\u8db3\u3002\r\n *\r\n * \u4e8c\u3001\u96c6\u5408\u6846\u67b6\r\n *      |----Collection\u63a5\u53e3\uff1a\u5355\u5217\u96c6\u5408\uff0c\u7528\u6765\u5b58\u50a8\u4e00\u4e2a\u4e00\u4e2a\u7684\u5bf9\u8c61\r\n *          |----List\u63a5\u53e3:\u5b58\u50a8\u6709\u5e8f\u7684\u3001\u53ef\u91cd\u590d\u7684\u6570\u636e\u3002  -->\"\u52a8\u6001\"\u6570\u7ec4\r\n *                  |----ArrayList\u3001LinkedList\u3001Vector\r\n *\r\n *          |----Set\u63a5\u53e3\uff1a\u5b58\u50a8\u65e0\u5e8f\u7684\u3001\u4e0d\u53ef\u91cd\u590d\u7684\u6570\u636e  -->\u9ad8\u4e2d\u8bb2\u7684\"\u96c6\u5408\"\r\n *                  |----HashSet\u3001LinkedHashSet\u3001TreeSet\r\n *\r\n *      |----Map\u63a5\u53e3\uff1a\u53cc\u5217\u96c6\u5408\uff0c\u7528\u6765\u5b58\u50a8\u4e00\u5bf9(key - value)\u4e00\u5bf9\u7684\u6570\u636e    -->\u9ad8\u4e2d\u51fd\u6570\uff1ay = f(x)\r\n *                  |----HashMap\u3001LinkedHashMap\u3001TreeMap\u3001Hashtable\u3001Properties\r\n *\r\n * \u4e09\u3001Collection\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u7684\u4f7f\u7528\r\n *\r\n * @author RichieZhang\r\n * @create 2022-10-25 \u4e0b\u5348 6:38\r\n *\/\r\npublic class CollectionTest {\r\n\r\n    @Test\r\n    public void test1 (){\r\n        Collection coll = new ArrayList();\r\n\r\n        \/\/add(Object e):\u5c06\u5143\u7d20e\u6dfb\u52a0\u5230\u96c6\u5408coll\u4e2d\r\n        coll.add(\"AA\");\r\n        coll.add(\"BB\");\r\n        coll.add(123);\/\/\u81ea\u52a8\u88c5\u7bb1\r\n        coll.add(new Date());\r\n\r\n        \/\/size():\u83b7\u53d6\u6dfb\u52a0\u7684\u5143\u7d20\u7684\u4e2a\u6570\r\n        System.out.println(coll.size());\/\/4\r\n\r\n        \/\/addAll(Collection coll1):\u5c06coll1\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u6dfb\u52a0\u5230\u5f53\u524d\u7684\u96c6\u5408\u4e2d\r\n        Collection coll1 = new ArrayList();\r\n        coll1.add(456);\r\n        coll1.add(\"CC\");\r\n        coll.addAll(coll1);\r\n        System.out.println(coll.size());\/\/6\r\n        System.out.println(coll);\r\n\r\n        \/\/clear():\u6e05\u7a7a\u96c6\u5408\u5143\u7d20\r\n        coll.clear();\r\n\r\n        \/\/isEmpty():\u5224\u65ad\u5f53\u524d\u96c6\u5408\u662f\u5426\u4e3a\u7a7a\r\n        System.out.println(coll.isEmpty());\r\n    }\r\n}\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[46],"class_list":["post-1177","post","type-post","status-publish","format-standard","hentry","category-java-code","tag-java"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1177"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1177"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1177\/revisions"}],"predecessor-version":[{"id":1178,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1177\/revisions\/1178"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1177"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1177"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1177"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}