Java 8 Static Method References

public class Test
{
    public static void main(String[] args)
    {
        testAdder(Test::add);
    }

    public static void testAdder(Adder adder)
    {
        System.out.println(adder.add(1, 2));
    }

    public static int add(int a, int b)
    {
        return a + b;
    }

    @FunctionalInterface
    interface Adder
    {
        int add(int a, int b);
    }
}