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

The first half of this introduction to Java inheritance teaches you how to use the extends keyword to derive a child class from a parent ... categories. As an example, Figure 1 shows car and ...

Classes with clear responsibilities, well-defined boundaries and a proper inheritance ... Java. The non-sealed keyword brings flexibility into the rigid world of sealed classes, to allow a particular ...