A Java class inherits these methods and can override any method that’s not declared final. For example, the non- final toString() method can be overridden, whereas the final wait() methods cannot.

Polymorphism in method overriding. It’s possible to change the return type of an overridden method if it is a covariant type. A covariant type is essentially a subclass of the return type. Here ...

There is a reason why Java method modifiers exist. If you call public methods internally and don't understand why, your developers could face major class issues. ... @Override. public Order ...