implements vs extends

Javarevisited: Difference between extends and implements keywords in Java? Example Tutorial

Difference between “implements Runnable” and “extends Thread” in java

uml - Can a class extend an abstract class and implement an interface at the same time? (java) - Stack Overflow

java for complete beginners - inheritance

java - How to extend or implement classes? - Stack Overflow

Interfaces in Java. In Java, an interface is a type that…

Inheritance in Java - Shiksha Online

Solved Which of the following is a correct EBNF description

Inheritance - Learneroo

Inheritance in Java – Quick Overview