Answer Posted / ashish ranjan

The main difference between String and StringBuffer is that String is Immutable, which means that we cannot modify the object which is created by the String.
As for Example.
String str = "abc";
now,
str = "abc" + "pqr";
the result is abcpqr. The previous value of str is not modified. It exists in the memory. Java Created new memory for str, which refers abcpqr.

now in case of StringBuffer
StringBuffer str = new StringBuffer("abc");
str.append("pqr");
it modifies in the same object.

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