1.How are string Buffer and String object different ? see the following code :
StringBuffer s1= new StringBuffer("JAVA");
StringBuffer s2= new StringBuffer("JAVA");
if s1.(equals(s2) )
System.out.println( s1 = s2)
else
System.out.println(s1 # s2);

The output is s1#s2.

However if I use String instead of String buffer the answer is
s1 = s2.

2.Also why does comparison with "==" yield different result from .equals() method.

Please explain Maha Anna !! Thanks in advance

Re your next question, it has been beaten to death
on the ranch, please do a search on "string" as your
subject and it is all there...hey no pains no gains

Regds,

The important difference is String class overrides this method
to do character by character comparision.
Whereas the StringBuffer class doesnot override this method.

So your ans gives they are not equal.

Next question - However if I use String instead
of String buffer the answer is s1 = s2.

It is because of String pooling
Java does. Remember Strings are reused by
Java if you created them using = operator
instead of new().

Next Question
2.Also why does comparison with "==" yield
different result from .equals() method.

Generally == compares references, not the
contents. So for reused strings, because the
strings are pointing to the same object(address)
== is returning true.

Does this answer your questions?