Joiner 线程安全吗？

Question

谷歌收藏Joiner线程安全吗？

Answer 1

是的！我们不会重复 SimpleDateFormat 的错误。 :-)

Joiner 需要接收与其姊妹类 Splitter 类似的文档升级，其中表示：

* <p><b>Warning: splitter instances are always immutable</b>; a configuration
* method such as {@code omitEmptyStrings} has no effect on the instance it
* is invoked on! You must store and use the new splitter instance returned by
* the method. This makes splitters thread-safe, and safe to store as {@code
* static final} constants . . .

Answer 2

它唯一的状态是 a

  private final String separator;

所以是的，它是线程安全的。