String,stringbuffer and StringBuilder, thread-safe, non-thread-safe

the difference between String,stringbuffer and StringBuilder??

Reprint Address: http://blog.csdn.net/rmn190/article/details/1492013

In addition: StringBuilder's realization and technique: http://lixianhuei.cnblogs.com/archive/2005/12/27/305708.html

Thread-safe, non-thread-safe discussion: How to understand StringBuffer is thread-safe StringBuilder is thread insecure? http://bbs.csdn.net/topics/390758940

Personal Summary:

Use string for strings that do not change frequently. Frequently changing, assembled strings are not used for string. If the global variable, can be multi-threaded reference, using StringBuffer, if the local variable, single-threaded use, recommended StringBuilder.

Other people's answers:

If you write a global range of StringBuffer and StringBuilder ... Two threads cannot modify the contents of the StringBuffer at the same time, but can modify the StringBuilder in the same time.

If you only use it as a local variable in a non-static method, you can use StringBuilder, it performs better

String,stringbuffer and StringBuilder, thread-safe, non-thread-safe