Can have private methods with the implementation (introduced in Java 9). Can have any kind of methods. Let’s explore the main differences between interfaces and abstract classes with a Java code ...

For an introduction to Java interfaces, including the difference between classes and interfaces, see my Java 101 tutorial Working with interfaces in Java. You access an enclosed interface by ...

To address the shortcomings of this approach, Java 1.1 introduced the concept of anonymous inner classes. An anonymous inner class allows developers to define and implement a functional interface at ...