In other words, a Java class that supports the SOLID open-closed ... To fix this example, we first create an interface that both the circle and the square implement: With this small change applied, ...

This example will show you four different ways to implement this functional interface in your code — starting with how to use an actual class, and how to create very concise code with a lambda ...

A plugin implements extension points declared by application or other plugins ... ExtensionPoint interface). Extension is an implementation of an extension point. It's a java annotation on a class. In ...