Is it possible to implement a functional interface with two abstract methods?

In Java, a functional interface is an interface with exactly one abstract method. This is a key requirement for using such interfaces with lambda expressions and method references.

If an interface contains two or more abstract methods, it is not considered a functional interface, and attempting to use it with a lambda expression will result in a compile-time error.

Example of a functional interface:

@FunctionalInterface
public interface MyFunction {
    void execute();
}

If a second abstract method is added, for example:

void anotherMethod();

then the interface will no longer be considered a functional interface.

Thus, implementing a functional interface with two abstract methods is impossible.