The reason why global constants in Java use the static and final keywords is because final ensures a variable cannot change, while static ensures only one copy of the constant variable is placed in ...

Use Java's extends keyword to derive a child class from a parent class, invoke parent class constructors and methods, override methods, and more.

Use Java assertions to test your assumptions about program correctness and check them in your code.

Sealed classes in Java let developers limit the creation and use of subclasses and preserve the class hierarchy. Here is how sealed classes in Java work.