Answer Posted / rajender

if use
String s="raj";
here string object created in string content pool(scp).it
(scp)doesn't allow duplicate objects.so it is immutable

String s=s+"ramu";
here string object created in heap allows duplicate
objects.so it is immutable
in heap

String s=rajramu;

if use string buffer every time it will create object in
heap.heap allows duplicate object.so it is mutable
StringBuffer sb=new StringBuffer("raj");
StringBuffersb1=sb.append("ramu");

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finally it create duplicate value in heap.

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