What is the difference between constant variables and final variables in java?

Question

Please help me understand the difference between constant variables and final variables in Java. I am a bit confused with it.

Answer 1

Make variable "final" means we cannot reassign a value to this variable (ie we can use variable = Something once and only once.

So for primitive we can say final variable are constante.

But final variable can be non constant. for exemple

final Stringbuffer string = new StringBuffer("not"); 
string.append(" constant");
System.out.println(string); 

will print the string "not constant". Here "string" variable is final but not constant. i hope this will help