java StringBuffer 与 StringBuilder 与 StringTokenizer
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StringBuffer vs StringBuilder Vs StringTokenizer
提问by Dead Programmer
what is the difference between the StringBuffer vs StringBuilder Vs StringTokenizer on the internal implementation. when to use these . kindly waiting for the answer.
StringBuffer 与 StringBuilder 与 StringTokenizer 在内部实现上的区别是什么。何时使用这些。敬请期待答案。
Update:-
更新：-
I am also going through the source code.
我也在浏览源代码。
回答by Péter T?r?k
StringBuffer- introduced in JDK 1.0 - is thread safe (all of its methods are synchronized), while StringBuilder- since JDK 1.5 - is not. Thus it is recommended to use the latter under normal circumstances.
StringBuffer- 在 JDK 1.0 中引入 - 是线程安全的（它的所有方法都是synchronized），而StringBuilder- 自 JDK 1.5 - 不是。因此建议在正常情况下使用后者。
StringTokenizeris meant for a whole different purpose then the former two: cutting strings into pieces, rather than assembling. As @Henning noted, it is also "retired" since JDK 1.5 - it is recommended to use String.splitinstead.
StringTokenizer与前两者的目的完全不同：将字符串切成碎片，而不是组装。正如@Henning 所指出的，它也从 JDK 1.5 开始“退休”——建议改用它String.split。
回答by Jigar Joshi
StringBuffer is designed to be thread-safe and all public methods in StringBuffer are synchronized. StringBuilder does not handle thread-safety issue and none of its methods is synchronized.
StringBuilder has better performance than StringBuffer under most circumstances.
Use the new StringBuilder wherever possible.
StringBuffer 被设计为线程安全的并且 StringBuffer 中的所有公共方法都是同步的。StringBuilder 不处理线程安全问题，并且它的任何方法都不同步。
在大多数情况下，StringBuilder 比 StringBuffer 具有更好的性能。
尽可能使用新的 StringBuilder。
Hereis performance comparisonof StringBuilder & StringBuffer
这里是performance comparison的StringBuilder的＆StringBuffer的
StringBuilder & StringBuffer Holds String where StringoTokeizer class allows an application to break a string into tokens .. So It is like odd one out
StringBuilder 和 StringBuffer 保存字符串，其中 StringoTokeizer 类允许应用程序将字符串分解为标记 .. 所以它就像一个奇怪的
回答by Gadolin
StringBuffer - is synchronized version of StringBuilder (introduced after its unsynchronized peer)
StringBuffer - 是 StringBuilder 的同步版本（在其未同步的对等体之后引入）
回答by keshav84
StringBuffer serves same purpose as StringBuilder except that StringBuffer is thread-safe.
StringTokenizer is used for splitting the string into tokens based on some delimiters.
除了 StringBuffer 是线程安全的外，StringBuffer 的用途与 StringBuilder 相同。
StringTokenizer 用于根据一些分隔符将字符串拆分为标记。
