Sanjay Dwivedi's Technology Web Log

One can have a class in an interface using nested classes (i.e. static inner classes).

public interface ClassInInterface {
void helloWorld();

class Test implements ClassInInterface {
public void helloWorld() {
System.out.println("Hello World!");
}
public static void main(String[] args) {
new Test().helloWorld();
}
}

The inner class in an interface is nested class - it is public and static.