Is “new String()” immutable as well?

Question

I\'ve been studying Java String for a while. The following questions are based on the below posts

Java String is special
Immutability of String in java

Answer 1

 String A = "Test"
 String B = "Test"

Now String B called"Test".toUpperCase()which change the same object into"TEST", soAwill also be"TEST"` which is not desirable.