When do some strings are not created via string const pool in java?

I want to clarify a doubt here

when we create a string via new operator

String s=new String("jk");

jk goes in String constant pool and heap

Now see

String s1=s+"winter"; 
 //case1

or

String s1="jk"+new String("winter");

Does winter in both case go to String Const pool?

How do i check it?