In this Java 101 tutorial, I’ve explained how interfaces differ from classes, and showed you how to declare, implement, and extend interfaces in your Java programs.

Well, you guessed it, it's interfaces, the contract that ensures that those methods will always do as they describe in the interface. 2 - Write specifications 🖋 Imagine we want to write a ...

For example, the standard class library provides a java.lang.Runnable interface with a single abstract void run() method. This functional interface’s declaration appears below: ...

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 ...

Java Supplier interface tutorial. As you can see, the code for the class that implements Java’s Supplier interface is fairly simple. The only requirements are the class declaration and the ...

In Java all parameters are passed by value. String Example. A few brief examples of String manipulations. BinaryConverter. A program with examples of various Java syntax that converts a base 10 int to ...