JavaTip : final values can be modified but cannot be reassigned

if I had a Person object and did final Person p = new Person("me"); it means I can’t reassignp to point to another Person object. I can still do p.setFirstName("you");

What confuses the situation is that

final int PI = 3.14;
final String greeting = "Hello World!";

Containers or objects with mutator methods that can alter the internal state of the object are not const just the reference to those objects are final and can’t be reassigned to reference another object.

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