What is the defferent between string and stringBuffer?

1. What is the defferent
between String and
String Buffer

2. String
String s= new String(“Nitesh”);
s.concat(“Mehta”);
sopln(s)Output =Nitesh;
S Nitesh
Nitesh Mehta

3. StringBuffer
StringBuffer sb=new SB(“Nitesh”);
sb.append(“Mehta”);
Sopln(sb)Output Nitesh Mehta;
s Nitesh Mehta

4. What is the defferent between String
and String Buffer?
 1.Once we Creates a string object we can’t perform any changes in the
existing object. If we are trying to perform any changes with those changes a
new object will created. This non changeable nature is nothing but
immutability of the string object.
 Once we Creates a StringBuffer object we can perform any type of changes in
the existing object. This changeable is nothing but mutability of the
StringBuffer object.