Answer Posted / vijay rana

String class is immutable, means we can not change the
contents of string at run time,
for example
String s1="loin";
string s2=s1.insert(3,"g");
now s2 have the value login ,but one thing to notice here is
that we are not assigning this value into s1, because it is
not possible in String class
,but if we want to change the contents of s1 then we will
have to take the StringBuilder calss
because with the help of this class we can change the
contents of same string
examlpe:
String s1="loin";
s1=s1.insert(3,"g");
now s1 is "login"
here we are assigning the value again in s1,
this is the main difference between in string and
stringBuilder class

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