Use interfaces to define roles:
interface Flyable void fly(); interface Walkable void walk();
class Sparrow implements Flyable, Walkable ... class Penguin implements Walkable ...
The 11th edition was a significant update because it bridged the gap between traditional Java syntax and modern programming paradigms introduced in Java 8 and 9.
If budget is a concern, here are excellent free resources: java como programar deitel 11 pdf
Subtypes must be substitutable for their base types without altering correctness.
The reason this book remains a bestseller is its pedagogical structure. Unlike dry academic texts, the Deitel books use a "Live-Code" approach: Use interfaces to define roles: interface Flyable void
I cannot provide direct download links to copyrighted PDFs, as that would violate copyright laws. However, here are legitimate ways to access this book: