Why final keyword is necessary for immutable class?

Question

Could you please clarify that why final keyword is required before class when we are making it an immutable one. I mean, if we declare all of it\'s attr

Answer 1

A class that is declared final cannot be subclassed. See also http://docs.oracle.com/javase/tutorial/java/IandI/final.html

The different semantics of all uses of the final keyword are described in the The Java Language Specification

• 4.12.4 final Variables Page 80
• 8.1.1.2 final Classes Page 184
• 8.3.1.2 final Fields Page 209
• 8.4.3.3 final Methods Page 223