Working with Methods

Question 1

Does the code compile with an uninitialised final instance or static variable?

Answer 1

1. If you declare a field to be final, it must be explicitly initialized by the time the creation of an object of the class is complete. 
So you can either initialize it immediately: 
private final double ANGLE = 0; 
IMPORTANT or you can initialize it in the constructor or an instance block.

2. Trying to change a final variable will make the code fail to compile as well, you can’t change its value once it is set.

Question 2

Can the synchronized keyword be applied to a class?

Answer 2

the synchronized keyword can never be applied to a class.