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.

Since Java 21, wrapper classes have played an increasingly sophisticated role in Java’s type system. Here’s everything you ...

This post explains how to use classes in Java to build objects and organize your code. Also learn: constructors, static methods, and more!

Sample Consumer interface use cases. The functional Consumer interface is used extensively across the Java API, with a number of classes in the java.util.function package, such as ObjIntConsumer, ...

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 ...

This is an in-depth java tutorial for beginners. Learn what Java is, how to get started, and how to build basic apps using key concepts! Java tutorial for beginners: Write a simple app with no ...