Implementing Default Method Bodies in Java Interfaces

In Java, interface method bodies are generally used to provide default implementation for methods that can be shared across multiple classes. This is achieved through the use of "default methods," which have block bodies that contain actual code. Default methods were introduced in Java 8 to enable more flexibility in designing interfaces without breaking existing code.

In this example, the Greeter interface has a default method greet(), which takes a String argument. The HelloWorld class implements the Greeter interface and inherits the greet() method. In the Main class, an instance of HelloWorld is created and the greet() method is called.