Java:String vs StringBuilder vs StringBuffer - 版本历史

2016年4月14日 (四) 11:37 imported>Soleverlee

2016-04-14T11:37:27Z

←上一版本		2016年4月14日 (四) 11:37的版本
第6行：		第6行：
	*StringBuilder		*StringBuilder
	**A mutable sequence of characters. This class provides an API compatible with <code>StringBuffer</code>, but with no guarantee of synchronization.This class is designed for use as a drop-in replacement for <code>StringBuffer</code> in places where the string buffer was being used by a single thread (as is generally the case). Where possible,it is recommended that this class be used in preference to <code>StringBuffer</code> as it will be faster under most implementations.		**A mutable sequence of characters. This class provides an API compatible with <code>StringBuffer</code>, but with no guarantee of synchronization.This class is designed for use as a drop-in replacement for <code>StringBuffer</code> in places where the string buffer was being used by a single thread (as is generally the case). Where possible,it is recommended that this class be used in preference to <code>StringBuffer</code> as it will be faster under most implementations.

			String类是不可变类，任何对String的改变都会引发新的String对象的生成；StringBuffer则是可变类，任何对它所指代的字符串的改变都不会产生新的对象。
	=性能分析=		=性能分析=
	以下是一个测试字符串相加的性能的程序：		以下是一个测试字符串相加的性能的程序：

2016年4月14日 (四) 11:36 imported>Soleverlee

2016-04-14T11:36:03Z

@@ 第6行： / 第6行： @@
 *StringBuilder
 **A mutable sequence of characters.  This class provides an API compatible with <code>StringBuffer</code>, but with no guarantee of synchronization.This class is designed for use as a drop-in replacement for <code>StringBuffer</code> in places where the string buffer was being used by a single thread (as is generally the case).   Where possible,it is recommended that this class be used in preference to <code>StringBuffer</code> as it will be faster under most implementations.
+=性能分析=
 以下是一个测试字符串相加的性能的程序：
 <source lang="java">
@@ 第39行： / 第39行： @@
+     }
 </source>
 [[Category:Programe]]

2016年4月14日 (四) 11:29 imported>Soleverlee

2016-04-14T11:29:34Z

@@ 第6行： / 第6行： @@
 *StringBuilder
 **A mutable sequence of characters.  This class provides an API compatible with <code>StringBuffer</code>, but with no guarantee of synchronization.This class is designed for use as a drop-in replacement for <code>StringBuffer</code> in places where the string buffer was being used by a single thread (as is generally the case).   Where possible,it is recommended that this class be used in preference to <code>StringBuffer</code> as it will be faster under most implementations.
 [[Category:Programe]]

imported>Soleverlee：以“有个题目，String，StringBuilder，StringBuffer三者有什么区别？蛋疼了，这又不是我写的，明显可以看文档的东西，考这个有什么...”为内容创建页面

2016-04-14T09:33:42Z

以“有个题目，String，StringBuilder，StringBuffer三者有什么区别？蛋疼了，这又不是我写的，明显可以看文档的东西，考这个有什么...”为内容创建页面

新页面

有个题目，String，StringBuilder，StringBuffer三者有什么区别？蛋疼了，这又不是我写的，明显可以看文档的东西，考这个有什么鸟用...

JDK的描述如下:
*StringBuffer:
**A thread-safe, mutable sequence of characters.A string buffer is like a {@link String}, but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls.
*StringBuilder
**A mutable sequence of characters. This class provides an API compatible with <code>StringBuffer</code>, but with no guarantee of synchronization.This class is designed for use as a drop-in replacement for <code>StringBuffer</code> in places where the string buffer was being used by a single thread (as is generally the case). Where possible,it is recommended that this class be used in preference to <code>StringBuffer</code> as it will be faster under most implementations.
[[Category:Programe]]

Java:String vs StringBuilder vs StringBuffer - 版本历史

2016年4月14日 (四) 11:37 imported>Soleverlee

2016年4月14日 (四) 11:36 imported>Soleverlee

2016年4月14日 (四) 11:29 imported>Soleverlee

imported>Soleverlee：​以“有个题目，String，StringBuilder，StringBuffer三者有什么区别？蛋疼了，这又不是我写的，明显可以看文档的东西，考这个有什么...”为内容创建页面

imported>Soleverlee：以“有个题目，String，StringBuilder，StringBuffer三者有什么区别？蛋疼了，这又不是我写的，明显可以看文档的东西，考这个有什么...”为内容创建页面