Answer / parameswaran

String is immutable object..we can't modified the value...
but string buffer is mutable object we can change.
>>It can increase or decrease the size dynamically..
>>It contains Max 255 characters..

Warm & Regards
Parames(PRC)

Thanjavur

Answer / kanchan

String are read only and immutable. The StringBuffer class
is used to represent characters that can be modified.
StringBuffer is faster than String when performing simple
concatenations.

Answer / gangabusi

String is immutable, we can not modify the string objects.
if we can create any string object
Ex: String S="Ganga";
here 'S' is string object created in heap memory.

I Want to add Something to S,
String S="Gangadhar";

Here In heap momory one more object is created for 'S',not
overridden.So that each and every updation String create
one new object in heap.



StringBuffer sb="Ganga"

here 'sb' is stringbuffer object created in heap memory.

I Want to add Something to sb,
StringBuffer sb="Gangadhar";

Here In heap momory 'sb' is overridden.So that each and
every updation StringBuffer create an object in stack.


It is mutable and it is Synchronized.(one thread process at
a time)

Answer / a kumar

String buffers are safe for use by multiple threads

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