<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[dumbant的专栏]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/dumbant</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; dumbant]]></copyright><item><title><![CDATA[成员变量覆盖]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/92814460</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/92814460</guid><author>dumbant</author><pubDate>Wed, 19 Jun 2019 12:10:12 +0800</pubDate><description><![CDATA[public class Test {

	public static void main(String[] args) {
		Test1 t = new Test1();
		t.setStr("newstr");
		t.setStr1("str1");
		t.setStr0("newstr0");
		
		System.out.println(t.getSql());
	}
	
}
...]]></description><category></category></item><item><title><![CDATA[android studio 中gradle配置]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/88578413</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/88578413</guid><author>dumbant</author><pubDate>Fri, 15 Mar 2019 17:05:45 +0800</pubDate><description><![CDATA[初学者，发现在android studio中，gradle有两个版本号。第一处在模块下的build.gradle里面:


buildscript {
    
    repositories {
        maven{url 'https://maven.aliyun.com/repository/google'}
        maven{url 'https://maven.ali...]]></description><category></category></item><item><title><![CDATA[List,Map 取值比较需要注意的地方]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/82427690</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/82427690</guid><author>dumbant</author><pubDate>Wed, 05 Sep 2018 17:33:27 +0800</pubDate><description><![CDATA[List&amp;lt;Integer&amp;gt; Map&amp;lt;Integer,Integer&amp;gt; 取值比较需要注意的地方

List&amp;lt;Integer&amp;gt; list = new ArrayList&amp;lt;Integer&amp;gt;();

list.add(1);

Map&amp;lt;Integer,Integer&amp;gt; map = new HashMap&amp;lt;Integer,Integer&amp;gt...]]></description><category></category></item><item><title><![CDATA[Calendar中的Calendar.HOUR容易出错的地方]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/80706803</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/80706803</guid><author>dumbant</author><pubDate>Fri, 15 Jun 2018 16:17:01 +0800</pubDate><description><![CDATA[Calendar c = Calendar.getInstance();
c.setTime(new Date());
c.set(Calendar.HOUR_OF_DAY, 12);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);Calendar c = Calendar.getInstance();
c.setTime(new Dat...]]></description><category></category></item><item><title><![CDATA[Integer 和 int 区别]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/80548726</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/80548726</guid><author>dumbant</author><pubDate>Sat, 02 Jun 2018 16:48:07 +0800</pubDate><description><![CDATA[1. int 是基础数据类型， Integer 是类, 是对 int的封装对象，具备对象的一切特性。2. 比较                int a = 300;
		int b = 300;
		Integer c = 300;
		Integer d = 300;
		Integer e = new Integer(300);
		Integer f = new Integer(300);...]]></description><category></category></item><item><title><![CDATA[eclipse 常用操作]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/80478509</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/80478509</guid><author>dumbant</author><pubDate>Mon, 28 May 2018 11:06:20 +0800</pubDate><description><![CDATA[1. 显示jar中的class点击下三角符号，取消勾选 Show 'Referenced Libraries' Node。就会显示当前引用的jar包，点击jar包可以展开查看里面有哪些class文件。]]></description><category></category></item><item><title><![CDATA[在linux上servlet中文乱码问题]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/80465252</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/80465252</guid><author>dumbant</author><pubDate>Sat, 26 May 2018 21:33:54 +0800</pubDate><description><![CDATA[原代码：JSONObject jsonObject = null;
		OutputStream os = null;
		InputStream is = null;
		try {
			String msg = null;

			os = new ByteArrayOutputStream();
			is = req.getInputStream();
			if (is != null...]]></description><category></category></item><item><title><![CDATA[JConsole远程连接配置]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/80392506</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/80392506</guid><author>dumbant</author><pubDate>Mon, 21 May 2018 15:10:24 +0800</pubDate><description><![CDATA[转载：https://www.cnblogs.com/think-in-java/p/6138439.htmlJConsole远程连接还是有一点坑的。这里记录一下配置过程，好记性不如烂笔头。 1.在远程机的tomcat的catalina.sh中加入配置：JAVA_OPTS=&quot;$JAVA_OPTS -Djava.rmi.server.hostname=192.168.202.121 -Dcom.su...]]></description><category></category></item><item><title><![CDATA[jstat命令查看jvm的GC情况]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/80199213</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/80199213</guid><author>dumbant</author><pubDate>Fri, 04 May 2018 19:05:43 +0800</pubDate><description><![CDATA[转载：https://www.cnblogs.com/yjd_hycf_space/p/7755633.htmljstat命令查看jvm的GC情况 （以Linux为例） jstat命令查看jvm的GC情况 （以Linux为例）  jstat命令可以查看堆内存各部分的使用量，以及加载类的数量。命令的格式如下： jstat [-命令选项] [vmid] [间隔时间/毫秒] [查询次数] 注意！！！：使...]]></description><category></category></item><item><title><![CDATA[Mysql中DATE_SUB 使用方法结合查询一天内,一周内,一月内的信息实例讲解]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/80091304</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/80091304</guid><author>dumbant</author><pubDate>Thu, 26 Apr 2018 11:20:00 +0800</pubDate><description><![CDATA[转载: http://www.jxbh.cn/newshow.asp?id=1347&amp;amp;tag=2 在对数据查询或菜单时经常要对指定的时间或时间段进行查询,例如要查询一天内的信息,要查询一周内的信息,要查询一个月内的,南昌网站建设公司工程师在此向大家介绍DATE_SUB函数,同时结合实例进行讲解,希望对新同事有所帮助. 定义和用法DATE_SUB() 函数从日期减去指定的时间间隔。1.语法D...]]></description><category></category></item><item><title><![CDATA[Java NIO系列教程（十） Java NIO DatagramChannel]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/79985150</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/79985150</guid><author>dumbant</author><pubDate>Wed, 18 Apr 2018 10:22:18 +0800</pubDate><description><![CDATA[转载：http://ifeve.com/datagram-channel/Java NIO中的DatagramChannel是一个能收发UDP包的通道。因为UDP是无连接的网络协议，所以不能像其它通道那样读取和写入。它发送和接收的是数据包。打开 DatagramChannel下面是 DatagramChannel 的打开方式：1DatagramChannel channel = DatagramC...]]></description><category></category></item><item><title><![CDATA[Java NIO系列教程（八） SocketChannel]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/79985136</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/79985136</guid><author>dumbant</author><pubDate>Wed, 18 Apr 2018 10:21:30 +0800</pubDate><description><![CDATA[转载：http://ifeve.com/socket-channel/Java NIO中的SocketChannel是一个连接到TCP网络套接字的通道。可以通过以下2种方式创建SocketChannel：打开一个SocketChannel并连接到互联网上的某台服务器。一个新连接到达ServerSocketChannel时，会创建一个SocketChannel。打开 SocketChannel下面是...]]></description><category></category></item><item><title><![CDATA[Java NIO系列教程（七） FileChannel]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/79985119</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/79985119</guid><author>dumbant</author><pubDate>Wed, 18 Apr 2018 10:20:52 +0800</pubDate><description><![CDATA[转载：http://ifeve.com/file-channel/Java NIO中的FileChannel是一个连接到文件的通道。可以通过文件通道读写文件。FileChannel无法设置为非阻塞模式，它总是运行在阻塞模式下。打开FileChannel在使用FileChannel之前，必须先打开它。但是，我们无法直接打开一个FileChannel，需要通过使用一个InputStream、Outpu...]]></description><category></category></item><item><title><![CDATA[Java NIO系列教程（六） Selector]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/79985095</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/79985095</guid><author>dumbant</author><pubDate>Wed, 18 Apr 2018 10:20:01 +0800</pubDate><description><![CDATA[转载：http://ifeve.com/selectors/Selector（选择器）是Java NIO中能够检测一到多个NIO通道，并能够知晓通道是否为诸如读写事件做好准备的组件。这样，一个单独的线程可以管理多个channel，从而管理多个网络连接。下面是本文所涉及到的主题列表：为什么使用Selector?Selector的创建向Selector注册通道SelectionKey通过Selecto...]]></description><category></category></item><item><title><![CDATA[Java NIO系列教程（四） Scatter/Gather]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/79984979</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/79984979</guid><author>dumbant</author><pubDate>Wed, 18 Apr 2018 10:12:40 +0800</pubDate><description><![CDATA[转载：http://ifeve.com/java-nio-scattergather/Java NIO开始支持scatter/gather，scatter/gather用于描述从Channel（译者注：Channel在中文经常翻译为通道）中读取或者写入到Channel的操作。分散（scatter）从Channel中读取是指在读操作时将读取的数据写入多个buffer中。因此，Channel将从Cha...]]></description><category></category></item><item><title><![CDATA[Java NIO系列教程（三） Buffer]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/79984803</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/79984803</guid><author>dumbant</author><pubDate>Wed, 18 Apr 2018 10:04:05 +0800</pubDate><description><![CDATA[转载：http://ifeve.com/buffers/Java NIO中的Buffer用于和NIO通道进行交互。如你所知，数据是从通道读入缓冲区，从缓冲区写入到通道中的。缓冲区本质上是一块可以写入数据，然后可以从中读取数据的内存。这块内存被包装成NIO Buffer对象，并提供了一组方法，用来方便的访问该块内存。下面是NIO Buffer相关的话题列表：Buffer的基本用法Buffer的cap...]]></description><category></category></item><item><title><![CDATA[Java NIO系列教程（二） Channel]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/79984757</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/79984757</guid><author>dumbant</author><pubDate>Wed, 18 Apr 2018 10:02:29 +0800</pubDate><description><![CDATA[转载: http://ifeve.com/channels/Java NIO的通道类似流，但又有些不同：既可以从通道中读取数据，又可以写数据到通道。但流的读写通常是单向的。通道可以异步地读写。通道中的数据总是要先读到一个Buffer，或者总是要从一个Buffer中写入。正如上面所说，从通道读取数据到缓冲区，从缓冲区写入数据到通道。如下图所示：Channel的实现这些是Java NIO中最重要的通道...]]></description><category></category></item><item><title><![CDATA[Java NIO系列教程（一） Java NIO 概述]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/79984701</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/79984701</guid><author>dumbant</author><pubDate>Wed, 18 Apr 2018 09:59:30 +0800</pubDate><description><![CDATA[转载: http://ifeve.com/overview/本系统文章只因本人在打开网页时很慢，复制过来备份。Java NIO 由以下几个核心部分组成：ChannelsBuffersSelectors虽然Java NIO 中除此之外还有很多类和组件，但在我看来，Channel，Buffer 和 Selector 构成了核心的API。其它组件，如Pipe和FileLock，只不过是与三个核心组件共同...]]></description><category></category></item><item><title><![CDATA[Java NIO系列教程（九） ServerSocketChannel]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/79984654</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/79984654</guid><author>dumbant</author><pubDate>Wed, 18 Apr 2018 09:57:04 +0800</pubDate><description><![CDATA[转载 : http://ifeve.com/server-socket-channel/只就原文在本人打开时很慢，复制过来备份Java NIO中的 ServerSocketChannel 是一个可以监听新进来的TCP连接的通道, 就像标准IO中的ServerSocket一样。ServerSocketChannel类在 java.nio.channels包中。这里有个例子：01ServerSocke...]]></description><category></category></item><item><title><![CDATA[Java NIO系列教程（五） 通道之间的数据传输]]></title><link>https://blog.youkuaiyun.com/dumbant/article/details/79984599</link><guid>https://blog.youkuaiyun.com/dumbant/article/details/79984599</guid><author>dumbant</author><pubDate>Wed, 18 Apr 2018 09:54:52 +0800</pubDate><description><![CDATA[原文地址：http://ifeve.com/java-nio-channel-to-channel/原文在打开的时候很慢，复制过来备份。在Java NIO中，如果两个通道中有一个是FileChannel，那你可以直接将数据从一个channel（译者注：channel中文常译作通道）传输到另外一个channel。transferFrom()FileChannel的transferFrom()方法可以...]]></description><category></category></item></channel></rss>