santhi Bendapudu

Thanks to all for clearing things.

Hi,
How many String objects are created when we run the following code.
String s1,s2,s3,s4;
s1 = "Hello";
s2 = s1;
s3 = s2 + "Pal";
s4 = s3;
Answer is 3
please explain
Thanking you,
Santhi