To access classes of one package in another package i.e use external classes without package qualification import feature is used. The classes and interfaces of one package are accessible in another ...

A simple Java program that uses Swing and Java2D to help students understand the concept of Java interfaces. The program is a JFrame that contains shapes. Created shapes can be dragged around the top ...

Nested classes are classes that are declared as members of other classes or scopes. Nesting classes is one way to better organize your code. For example, say you have a non-nested class (also known as ...

If you’ve read my Java 101 tutorial introducing static classes and inner classes, you should be familiar with the basics of working with nested classes in Java code. In this Java tip, you’ll learn ...

This project shows how to call a static method on an interface in groovy. This seems to work just fine on Java 8, but when you run the example on Java 9 you get the following error: ...

Java 8 came with the enhanced functionality to the Interfaces. Prior to Java 8, interfaces were contracted only with the abstract methods and subclass was obliged to implement the contract. Child ...

A great deal of Java programming -- from conditional statements to iterative loops -- deals with the evaluation of true or false values. When you work with the JDK's Streams API and Lambda functions, ...

Community driven content discussing all aspects of software development from DevOps to design patterns. If you want to master functional programming, the best place to start is with the Java Function ...