Additional Notes
Why does the difference between abstract classes and interfaces matter in practice?
Track: Java
Topic: Core Java
Focus: Code Reading with Related Types
Java: Code Reading with Related Types
Answer
Abstract classes can have method bodies; interfaces cannot until Java 8.
Abstract classes can include implemented methods and fields, while interfaces traditionally only declare methods. This means abstract classes are used when classes share behavior or state, whereas interfaces are used to define a contract for disparate classes. For example, an abstract class 'Vehicle' might have fields like 'speed', while an interface 'Drivable' would just declare a method 'drive()'.
Abstract classes can include implemented methods and fields, while interfaces traditionally only declare methods. This means abstract classes are used when classes share behavior or state, whereas interfaces are used to define a contract for disparate classes. For example, an abstract class 'Vehicle' might have fields like 'speed', while an interface 'Drivable' would just declare a method 'drive()'.
Topics: Code Reading with Related Types Core Java Java