Abstract classes and interfaces in Java serve fundamentally different purposes. ... Here’s an example: public abstract class AbstractMethods { abstract void doSomething(); } ...

For example, using the keyword implements will make a Java interface, while the keyword extends makes an abstract class. Abstraction vs. encapsulation Encapsulation in object-oriented programming is ...

public abstract class Ellipse2D extends RectangularShape ... For example, the Matcher class, in java.util.regex, provides a results() method that returns a stream of match results.