Inheritance and composition are two ... Now let’s try the same example using composition: import java.util.HashSet; import java.util.Set; public class CharacterCompositionExample { static ...

Sealed classes address precisely the type of inheritance control previously described. Here's how we can refactor the above example ... developer can add that clause. The modifier non-sealed is the ...

For example, a Java program obtains ... usefulness of empty interfaces. In addition, you learned how to implement interfaces and why multiple interface inheritance is safe. Finally, you witnessed ...