Answer / chithra

String Buffer is Sybchronized where as String Builder is not.

Answer / subhareddy

There is no much difference between string buffer and string
builder.only thing is all the methods available in string
buffer class are synchronized methods.and the method
available in string builder class are non-synchronized methods.
If we want thread safety then we have to go for string
buffer ,but performance goes down.if we don't want thread
safety the we can go for string builder

Answer / mohan

String is immutable whereas StringBuffer and StringBuilder
can change their values.

The only difference between StringBuffer and StringBuilder
is that StringBuilder is unsynchronized whereas StringBuffer
is synchronized. So when the application needs to be run
only in a single thread then it is better to use
StringBuilder. StringBuilder is more efficient than
StringBuffer.

Criteria to choose among String, StringBuffer and StringBuilder

---If your text is not going to change use a string Class
because a String object is immutable.
---If your text can change and will only be accessed from a
single thread, use a StringBuilder because StringBuilder is
unsynchronized.
---If your text can changes, and will be accessed from
multiple threads, use a StringBuffer because StringBuffer is
synchronous.

Answer / rajujohn

hi All
Both are mutable ,that means we can change value of the
instance variable using append,insert and ...
But only one difference when you go for the multi-thread
concept you use StringBuffer,Because it is thread safe ,that
means, if one thread access this stringbuffer variable on
the time another thread cant access this stringbuffer,so
stringbuffer is slowest performance compare to stringbuilder.

by raju.j

Answer / radhakrishnan

Please visit
http://yourjavatutor.blogspot.in/2011/12/difference-between-stringstringbuffer.html
for more details

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