Implementing an interface with two abstract methods by a lambda expression

Question

In Java 8 the lambda expression is introduced to help with the reduction of boilerplate code. If the interface has only one method it works fine. I

Answer 1

I usually create a static factory method directly in the interface:

public inteface I1 {
    void show1();
    void show2();

    public static I1 of(Runnable show1, Runnable show2) {
        return new I1() {
            void show1() { show1.run(); }
            void show2() { show2.run(); }
        };
    }
}

Usage:

I1 i1 = I1.of(() -> System.out.println("show1"), () -> System.out.println("show2"));