{"id":3937,"date":"2018-06-03T08:47:49","date_gmt":"2018-06-03T00:47:49","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=3937"},"modified":"2018-06-03T08:47:49","modified_gmt":"2018-06-03T00:47:49","slug":"java%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e4%bb%a3%e7%a0%81%e7%89%87%e6%ae%b5","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/3937.html","title":{"rendered":"Java\u4e2d\u7684\u4e00\u4e9b\u57fa\u7840\u4ee3\u7801\u7247\u6bb5"},"content":{"rendered":"<p>=Start=<\/p>\n<h4 id=\"id-\u6a21\u677f-\u7f18\u7531\uff1a\">\u7f18\u7531\uff1a<\/h4>\n<p>\u56e0\u4e3aJava\u4ee3\u7801\u5199\u7684\u8fd8\u4e0d\u591a\uff0c\u6240\u4ee5\u6709\u65f6\u5019\u5728\u78b0\u5230\u4e00\u4e9b\u5728\u5176\u4ed6\u8bed\u8a00\uff08\u6bd4\u5982\uff1aPython\u3001Shell\u3001\u2026\u2026\uff09\u91cc\u6bd4\u8f83\u5bb9\u6613\u5b9e\u73b0\u7684\u529f\u80fd\u65f6\u4e5f\u4e0d\u592a\u987a\u7545\uff0c\u6240\u4ee5\u6253\u7b97\u4e0d\u65ad\u7528\u6587\u7ae0\u8fdb\u884c\u6574\u7406\u603b\u7ed3\uff0c\u4e89\u53d6\u65e9\u65e5\u80fd\u8f83\u4e3a\u719f\u7ec3\u7684\u4f7f\u7528Java\u8fdb\u884c\u5f00\u53d1\u3002<\/p>\n<h4 id=\"id-\u6a21\u677f-\u6b63\u6587\uff1a\">\u6b63\u6587\uff1a<\/h4>\n<h5 id=\"id-\u6a21\u677f-\u53c2\u8003\u89e3\u7b54\uff1a\">\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n<h6><strong>1\u3001\u6253\u5370\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\u3001\u7edf\u8ba1\u67d0\u4e00\u6bb5\u4ee3\u7801\u7684\u6267\u884c\u8017\u65f6<\/strong><\/h6>\n<pre class=\"lang:default decode:true \">import java.text.DateFormat;\r\nimport java.text.SimpleDateFormat;\r\nimport java.util.Date;\r\n\r\npublic class StrFormatPrint {\r\n\r\n    public static void main(String[] args) {\r\n        long time1 = System.currentTimeMillis();\r\n        DateFormat dateFormat = new SimpleDateFormat(\"YYYY-MM-dd HH:mm:ss\");\r\n        Date date = new Date();\r\n        System.out.println(dateFormat.format(date));\r\n        try {\r\n            Thread.sleep(1000);\r\n        } catch (InterruptedException e) {\r\n            e.printStackTrace();\r\n        }\r\n        long time2 = System.currentTimeMillis();\r\n\r\n        String strTemplate = \"[%s] spend {%d} ms to call %s\";\r\n        System.out.println( String.format(strTemplate, dateFormat.format(date), time2-time1, \"method_name\") );\r\n    }\r\n}<\/pre>\n<p>\u4e0a\u9762\u8fd9\u4e00\u6bb5\u4ee3\u7801\u4e3b\u8981\u662f\u56e0\u4e3aJava\u91cc\u9762\u7684 `System.out.println` \u4e0d\u652f\u6301\u5b57\u7b26\u4e32+\u6574\u578b\u7684\u5199\u6cd5\uff0c\u6240\u4ee5\u4f7f\u7528 String.format \u505a\u7684\u4e00\u4e2a\u6298\u4e2d\uff0c\u4e5f\u602a\u6211\u5bf9Java\u8fd8\u4e0d\u591f\u719f\u3002<\/p>\n<h6><strong>2\u3001sleep\u4e00\u6bb5\u65f6\u95f4\u5728Java\u4e2d\u8be5\u600e\u4e48\u5199<\/strong><\/h6>\n<pre class=\"lang:default decode:true \">try {\r\n    Thread.sleep(1000);\r\n} catch (InterruptedException e) {\r\n    e.printStackTrace();\r\n}<\/pre>\n<p>\u4e3a\u4ec0\u4e48\u4f7f\u7528sleep()\u800c\u4e0d\u662fwait()\uff0c\u5177\u4f53\u539f\u56e0\u53ef\u4ee5\u53c2\u8003\u300c<a href=\"https:\/\/www.cnblogs.com\/hongten\/p\/hongten_java_sleep_wait.html\" target=\"_blank\" rel=\"noopener\">java\u4e2d\u7684sleep()\u548cwait()\u7684\u533a\u522b<\/a>\u300d\uff0c\u603b\u7ed3\u8d77\u6765\u5176\u5b9e\u5c31\u662f\uff1a\u5f53\u8c03\u7528wait()\u65b9\u6cd5\u7684\u65f6\u5019\uff0c\u7ebf\u7a0b\u4f1a\u653e\u5f03\u5bf9\u8c61\u9501\uff0c\u8fdb\u5165\u7b49\u5f85\u6b64\u5bf9\u8c61\u7684\u7b49\u5f85\u9501\u5b9a\u6c60\uff0c\u53ea\u6709\u9488\u5bf9\u6b64\u5bf9\u8c61\u8c03\u7528notify()\u65b9\u6cd5\u540e\u672c\u7ebf\u7a0b\u624d\u8fdb\u5165\u5bf9\u8c61\u9501\u5b9a\u6c60\u51c6\u5907\uff1b\u800csleep()\u5230\u65f6\u95f4\u4e86\u4e4b\u540e\u4f1a\u81ea\u52a8\u6062\u590d\u3002<\/p>\n<h6><strong>3\u3001Java\u4e2djson\u5b57\u7b26\u4e32\u7684\u89e3\u6790\uff08\u6b64\u5904\u7528fastjson\u8fdb\u884c\u5904\u7406\uff09<\/strong><\/h6>\n<pre class=\"lang:default decode:true \">import com.alibaba.fastjson.JSON;\r\nimport com.alibaba.fastjson.JSONObject;\r\n\r\n\r\nString sourceData = \"{\\\"key1\\\": \\\"value1\\\", \\\"key2\\\": \\\"value2\\\"}\";\r\nJSONObject jsonObject = JSON.parseObject(sourceData);\r\nfor (String key: jsonObject.keySet()) {\r\n    System.out.println(\"key: \" + key + \"\\tvalue: \" + jsonObject.getString(key));\r\n}\r\n\r\nif (jsonObject.containsKey(\"key0\")) {\r\n    System.out.println(\"jsonObject.containsKey(\\\"key0\\\") == True\");\r\n} else {\r\n    System.out.println(\"jsonObject.containsKey(\\\"key0\\\") == False\");\r\n}\r\n\r\nJSONObject result = new JSONObject();\r\nresult.put(\"ua\", jsonObject.getString(\"ua\"));\r\nresult.put(\"name\", jsonObject.getString(\"key1\"));\r\nSystem.out.println(result);\r\n\r\nSystem.out.println(\"jsonObject.getString(\\\"ua\\\")==\" + jsonObject.getString(\"ua\"));<\/pre>\n<h6><strong>4\u3001Java\u4e2dCollection\u96c6\u5408\u7684\u7b80\u5355\u64cd\u4f5c<\/strong><\/h6>\n<pre class=\"lang:default decode:true \">package com.ixyzero.learn;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.Arrays;\r\nimport java.util.Collection;\r\nimport java.util.List;\r\n\r\n\/**\r\n * Java\u96c6\u5408\u603b\u7ed3\u4e4bCollection\u6574\u4f53\u6846\u67b6 https:\/\/blog.csdn.net\/snail_rao\/article\/details\/7617810\r\n * java Collection\u4e2d\u7684\u6392\u5e8f\u95ee\u9898 https:\/\/www.cnblogs.com\/huangfox\/archive\/2012\/07\/05\/2577306.html\r\n *\r\n * https:\/\/blog.csdn.net\/oguro\/article\/details\/53413861\r\n * \u6570\u7ec4\uff1a\u5b58\u50a8\u540c\u4e00\u79cd\u6570\u636e\u7c7b\u578b\u7684\u96c6\u5408\u5bb9\u5668.\r\n \u6570\u7ec4\u7684\u7279\u70b9\uff1a\r\n 1. \u53ea\u80fd\u5b58\u50a8\u540c\u4e00\u79cd\u6570\u636e\u7c7b\u578b\u7684\u6570\u636e\u3002\r\n 2. \u4e00\u65e6\u521d\u59cb\u5316\uff0c\u957f\u5ea6\u56fa\u5b9a\u3002\r\n 3. \u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u4e0e\u5143\u7d20\u4e4b\u95f4\u7684\u5185\u5b58\u5730\u5740\u662f\u8fde\u7eed\u7684\u3002\r\n \u6ce8\u610f\uff1a Object\u7c7b\u578b\u7684\u6570\u7ec4\u53ef\u4ee5\u5b58\u50a8\u4efb\u610f\u7c7b\u578b\u7684\u6570\u636e\u3002\r\n\r\n * \u96c6\u5408\uff1a\u96c6\u5408\u662f\u5b58\u50a8\u5bf9\u8c61\u6570\u636e\u7684\u96c6\u5408\u5bb9\u5668\u3002\r\n \u96c6\u5408\u6bd4\u6570\u7ec4\u7684\u4f18\u52bf\uff1a\r\n 1. \u96c6\u5408\u53ef\u4ee5\u5b58\u50a8\u4efb\u610f\u7c7b\u578b\u7684\u5bf9\u8c61\u6570\u636e\uff0c\u6570\u7ec4\u53ea\u80fd\u5b58\u50a8\u540c\u4e00\u79cd\u6570\u636e\u7c7b\u578b \u7684\u6570\u636e\u3002\r\n 2. \u96c6\u5408\u7684\u957f\u5ea6\u662f\u4f1a\u53d1\u751f\u53d8\u5316\u7684\uff0c\u6570\u7ec4\u7684\u957f\u5ea6\u662f\u56fa\u5b9a\u7684\u3002\r\n\r\n Java\u96c6\u5408\u6846\u67b6\u4e4bCollection\u5b9e\u4f8b\u89e3\u6790\r\n https:\/\/blog.csdn.net\/qq_28261343\/article\/details\/52614411\r\n\r\n\r\n *\/\r\npublic class CollectionTest {\r\n    public static void main(String[] args) {\r\n        Collection&lt;Long&gt; uids = new ArrayList&lt;Long&gt;();\r\n        System.out.print(uids);\r\n        System.out.println(uids.size());\r\n\r\n        uids.add((long) 12345);\r\n        System.out.print(uids);\r\n        System.out.println(uids.size());\r\n\r\n        String uidStr = \"1,2,3,4,5,6,7,8,9,12345\";\r\n        for (String uid: uidStr.split(\",\")) {\r\n            uids.add(Long.parseLong(uid));\r\n        }\r\n        System.out.print(uids);\r\n        System.out.println(uids.size());\r\n\r\n        uids.remove(1);\r\n        System.out.print(uids);\r\n        System.out.println(uids.size());\r\n\r\n        uids.remove((long) 1);\r\n        System.out.print(uids);\r\n        System.out.println(uids.size());\r\n\r\n        \/\/ String testStr = \"123\";\r\n        \/\/ String[] items = testStr.split(\",\");\r\n        \/\/ System.out.println(items.length);\r\n        \/\/ for (String item: testStr.split(\",\")) {\r\n        \/\/     System.out.println(item);\r\n        \/\/ }\r\n\r\n        String[] words = {\"ace\", \"boom\", \"crew\", \"dog\", \"eon\"};\r\n        List&lt;String&gt; wordList = Arrays.asList(words);\r\n        System.out.println(wordList.size());\r\n        System.out.println(wordList);\r\n        \/\/ for (String e: wordList){\r\n        \/\/     System.out.println(e);\r\n        \/\/ }\r\n    }\r\n}<\/pre>\n<h6><strong>5\u3001\u5f85\u6dfb\u52a0<\/strong><\/h6>\n<ul>\n<li>Java\u4e2d\u7684list\/map\/set\u64cd\u4f5c\uff0c\u4ee5\u53ca\u53bb\u91cd\u3001\u6392\u5e8f\uff1b<\/li>\n<li>Java\u4e2d\u7684HTTP\u64cd\u4f5c\uff1b<\/li>\n<li>Java\u4e2d\u7684MySQL\u64cd\u4f5c\uff08\u76f4\u8fde\u3001\u4f7f\u7528c3p0\u7b49\u8fde\u63a5\u6c60\uff09\uff1b<\/li>\n<li>Java\u4e2d\u7684Redis\/Mongo\u64cd\u4f5c\uff1b<\/li>\n<li>Java\u4e2d\u7684\u547d\u4ee4\u6267\u884c\u64cd\u4f5c\uff1b<\/li>\n<li>Java\u4e2d\u7684\u591a\u7ebf\u7a0b\u3001\u7ebf\u7a0b\u6c60\u64cd\u4f5c\uff1b<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h5 id=\"id-\u6a21\u677f-\u53c2\u8003\u94fe\u63a5\uff1a\">\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n<p>java\u4e2d\u7684sleep()\u548cwait()\u7684\u533a\u522b<br \/>\n<a href=\"https:\/\/www.cnblogs.com\/hongten\/p\/hongten_java_sleep_wait.html\">https:\/\/www.cnblogs.com\/hongten\/p\/hongten_java_sleep_wait.html<\/a><\/p>\n<p>Java\u4e2d\u5982\u4f55\u83b7\u53d6\u5f53\u524d\u65e5\u671f\/\u65f6\u95f4<br \/>\n<a href=\"https:\/\/stackoverflow.com\/questions\/5175728\/how-to-get-the-current-date-time-in-java\">https:\/\/stackoverflow.com\/questions\/5175728\/how-to-get-the-current-date-time-in-java<\/a><br \/>\n<a href=\"https:\/\/stackoverflow.com\/questions\/23944370\/how-to-get-milliseconds-from-localdatetime-in-java-8\">https:\/\/stackoverflow.com\/questions\/23944370\/how-to-get-milliseconds-from-localdatetime-in-java-8<\/a><br \/>\n<a href=\"http:\/\/www.mkyong.com\/java\/java-how-to-get-current-date-time-date-and-calender\/\">http:\/\/www.mkyong.com\/java\/java-how-to-get-current-date-time-date-and-calender\/<\/a><\/p>\n<p>Java\u4e2d String \u548c Date\/Timestamp \u4e4b\u95f4\u7684\u8f6c\u6362<br \/>\n<a href=\"http:\/\/yunnick.iteye.com\/blog\/1074495\">http:\/\/yunnick.iteye.com\/blog\/1074495<\/a><br \/>\n<a href=\"https:\/\/www.cnblogs.com\/Matrix54\/archive\/2012\/05\/03\/2481260.html\">https:\/\/www.cnblogs.com\/Matrix54\/archive\/2012\/05\/03\/2481260.html<\/a><\/p>\n<p>java c3p0\u8fde\u63a5\u6c60 \u4e0d\u7528spring\u5355\u72ec\u4f7f\u7528c3p0<br \/>\n<a href=\"https:\/\/blog.csdn.net\/nx188\/article\/details\/51758055\">https:\/\/blog.csdn.net\/nx188\/article\/details\/51758055<\/a><\/p>\n<p>Java\u4e2d\u7684\u5b57\u7b26\u4e32\u5207\u5206<br \/>\n<a href=\"https:\/\/stackoverflow.com\/questions\/3481828\/how-to-split-a-string-in-java\">https:\/\/stackoverflow.com\/questions\/3481828\/how-to-split-a-string-in-java<\/a><\/p>\n<p>java\u7684Collection\u7c7b\u8be6\u89e3<br \/>\n<a href=\"https:\/\/blog.csdn.net\/oguro\/article\/details\/53413861\">https:\/\/blog.csdn.net\/oguro\/article\/details\/53413861<\/a><\/p>\n<p>java\u2014\u2014Collection\u6846\u67b6\uff0cCollections<br \/>\n<a href=\"https:\/\/www.cnblogs.com\/dong-liu\/p\/7428982.html\">https:\/\/www.cnblogs.com\/dong-liu\/p\/7428982.html<\/a><\/p>\n<p>=END=<\/p>\n","protected":false},"excerpt":{"rendered":"<p>=Start= \u7f18\u7531\uff1a \u56e0\u4e3aJava\u4ee3\u7801\u5199\u7684\u8fd8\u4e0d\u591a\uff0c\u6240\u4ee5\u6709\u65f6\u5019\u5728\u78b0\u5230\u4e00\u4e9b\u5728\u5176\u4ed6\u8bed\u8a00\uff08\u6bd4\u5982\uff1aPython\u3001She [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,7],"tags":[930,61,561],"class_list":["post-3937","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-programing","tag-code","tag-java","tag-snippet"],"views":11193,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3937","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=3937"}],"version-history":[{"count":1,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3937\/revisions"}],"predecessor-version":[{"id":3938,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3937\/revisions\/3938"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=3937"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=3937"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=3937"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}