See the Java 101 Java interfaces tutorial for a more in-depth introduction to using interfaces in your Java programs, including where and where not to use default, static, and private methods.

The Java Tutorial goes on to list bullets for when an abstract class should be considered and for when an interface should be considered. Unsurprisingly, these are derived from the previously ...

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 ...

How to use Java’s Function interface. For this Java Function interface example, we will provide a single method named “apply” that takes an Integer as an argument, squares it and returns the result as ...