Answer Posted / monika

string is immutable, that is it can not be extended.whereas
StringBuffer is mutable and can be extended.
Fro example :
Consider 2 statement : "Welcome " and "to Java World".
now assign first statement to string and string buffer.
String str = "Welcome" & StringBuffer strBuff = new
StringBuffer("Welcome");
Now if we add 2nd statement to both then :
str= str + "to Java World" -> In this case, it would dump
all the memory allocated with "welcome" and allocate a new
memory space to the entire string "Welcome to Java World" .
On the other hand, in strBuff :-
strBuff.append("to Java World") -> if simply allocate a
new memory space to only 2nd statement and add to link to
previous name.

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