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.

Using the walk () method in Java 8 and onwards This programming tutorial will demonstrate how to utilize each of the above techniques to navigate a directory structure in Java.

Another way to use an asynchronous callback function is to use the CompletableFuture API. This powerful API, introduced in Java 8, facilitates executing and combining asynchronous method invocations.

A method might accept a specific type and its subclasses, but you want to restrict usage to a select few implementations of your own design. Java's open inheritance model can feel like an open ...