<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[green_4321的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/green_4321</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; green_4321]]></copyright><item><title><![CDATA[第07章 常用类库API_07_Math_Random和日期工具类的使用]]></title><link>https://blog.youkuaiyun.com/green_4321/article/details/84898563</link><guid>https://blog.youkuaiyun.com/green_4321/article/details/84898563</guid><author>green_4321</author><pubDate>Sat, 08 Dec 2018 20:27:21 +0800</pubDate><description><![CDATA[  


		DateFormat df = new SimpleDateFormat(&quot;yyyy年MM月dd日hh:mm:ss  SSS&quot;);
		String nowDate = df.format(new Date());
		System.out.println(nowDate);



]]></description><category></category></item><item><title><![CDATA[第07章 常用类库API_06_程序国际化ResourceBundle与动态文本处理]]></title><link>https://blog.youkuaiyun.com/green_4321/article/details/84894080</link><guid>https://blog.youkuaiyun.com/green_4321/article/details/84894080</guid><author>green_4321</author><pubDate>Sat, 08 Dec 2018 16:30:16 +0800</pubDate><description><![CDATA[ 



 



 

]]></description><category></category></item><item><title><![CDATA[第07章 常用类库API_04_StringBuilder分析]]></title><link>https://blog.youkuaiyun.com/green_4321/article/details/84892878</link><guid>https://blog.youkuaiyun.com/green_4321/article/details/84892878</guid><author>green_4321</author><pubDate>Sat, 08 Dec 2018 15:05:02 +0800</pubDate><description><![CDATA[转自：
作者： Betayao
出处：https://blog.youkuaiyun.com/weixin_35713860/article/details/82766350
对其中一些地方加入了自己的思考和整理，供自己和同学们学习参考。

StringBuilder

JDK官方文档里是这样说的：一个可变的字符序列。 此类提供与StringBuffer的API，但不保证同步。 此类设计用作简易替换为Stri...]]></description><category></category></item><item><title><![CDATA[第07章 常用类库API_03_StringBuffer源码分析与常用方法]]></title><link>https://blog.youkuaiyun.com/green_4321/article/details/84892475</link><guid>https://blog.youkuaiyun.com/green_4321/article/details/84892475</guid><author>green_4321</author><pubDate>Sat, 08 Dec 2018 14:49:17 +0800</pubDate><description><![CDATA[

在实际开发当中，我们经常会使用到字符串连接的操作，如果用String来操作，则使用“+”号完成字符串的连接操作。

使用String连接字符串，代码性能会非常低，应为String的内容不可改变，解决这个问题的方法是使用StringBuffer。

 

  StringBuffer在进行字符串处理时，不生成新的对象，在内存使用上要优于String类，所以在实际使用时，如果经常需要对一个字符串进...]]></description><category></category></item><item><title><![CDATA[第07章 常用类库API_02_String常用方法介绍]]></title><link>https://blog.youkuaiyun.com/green_4321/article/details/84887861</link><guid>https://blog.youkuaiyun.com/green_4321/article/details/84887861</guid><author>green_4321</author><pubDate>Fri, 07 Dec 2018 22:00:18 +0800</pubDate><description><![CDATA[本文截图：https://blog.youkuaiyun.com/li1376417539/article/details/82725259

详细版：https://blog.youkuaiyun.com/mr_leixiansheng/article/details/73796393



]]></description><category></category></item><item><title><![CDATA[第07章 常用类库API_01_String类原理分析]]></title><link>https://blog.youkuaiyun.com/green_4321/article/details/84887515</link><guid>https://blog.youkuaiyun.com/green_4321/article/details/84887515</guid><author>green_4321</author><pubDate>Fri, 07 Dec 2018 21:49:11 +0800</pubDate><description><![CDATA[1.String类用来存储字符串。

2.String类实际是使用字符数组存储的

 

1.构造方法：String stra = new String(&quot;abcdefg&quot;);
2.直接赋值：String strb = &quot;abcdefg&quot;;
 

推荐使用直接赋值；原因有二，1.形式简洁；2.占用内存少；

具体分析见https://blog.youkuaiyun.com/qq_37199582/articl...]]></description><category></category></item><item><title><![CDATA[Java核心技术之面向对象12 Object 类]]></title><link>https://blog.youkuaiyun.com/green_4321/article/details/84715468</link><guid>https://blog.youkuaiyun.com/green_4321/article/details/84715468</guid><author>green_4321</author><pubDate>Sun, 02 Dec 2018 15:23:31 +0800</pubDate><description><![CDATA[]]></description><category></category></item><item><title><![CDATA[Java核心技术之抽象技术9抽象类应用-模板方法模式；接口应用-策略模式]]></title><link>https://blog.youkuaiyun.com/green_4321/article/details/84712225</link><guid>https://blog.youkuaiyun.com/green_4321/article/details/84712225</guid><author>green_4321</author><pubDate>Sun, 02 Dec 2018 14:22:07 +0800</pubDate><description><![CDATA[

 



 

 

 ]]></description><category></category></item><item><title><![CDATA[Java核心技术之面向对象09Instanceof关键字]]></title><link>https://blog.youkuaiyun.com/green_4321/article/details/84711073</link><guid>https://blog.youkuaiyun.com/green_4321/article/details/84711073</guid><author>green_4321</author><pubDate>Sun, 02 Dec 2018 13:59:20 +0800</pubDate><description><![CDATA[

 

]]></description><category></category></item><item><title><![CDATA[Java核心技术之面向对象8面向对象的多态性]]></title><link>https://blog.youkuaiyun.com/green_4321/article/details/84703657</link><guid>https://blog.youkuaiyun.com/green_4321/article/details/84703657</guid><author>green_4321</author><pubDate>Sun, 02 Dec 2018 11:31:59 +0800</pubDate><description><![CDATA[ 

 





 

]]></description><category></category></item><item><title><![CDATA[Java核心技术之面向对象07接口的基本概念]]></title><link>https://blog.youkuaiyun.com/green_4321/article/details/84635807</link><guid>https://blog.youkuaiyun.com/green_4321/article/details/84635807</guid><author>green_4321</author><pubDate>Thu, 29 Nov 2018 16:48:16 +0800</pubDate><description><![CDATA[ 



 



 

 

]]></description><category></category></item><item><title><![CDATA[Java核心技术之面向对象06抽象类]]></title><link>https://blog.youkuaiyun.com/green_4321/article/details/84632717</link><guid>https://blog.youkuaiyun.com/green_4321/article/details/84632717</guid><author>green_4321</author><pubDate>Thu, 29 Nov 2018 14:49:20 +0800</pubDate><description><![CDATA[ 

 



 

]]></description><category></category></item><item><title><![CDATA[Java核心技术之面向对象4、方法的重写]]></title><link>https://blog.youkuaiyun.com/green_4321/article/details/84620891</link><guid>https://blog.youkuaiyun.com/green_4321/article/details/84620891</guid><author>green_4321</author><pubDate>Thu, 29 Nov 2018 11:19:15 +0800</pubDate><description><![CDATA[



 

 



 

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