Consumer<Object> print = System.out::println;
// ...
print.accept("Hello, World!");

--------------------------------------------------

interface Interf
{
    public Sample m1();
}

public class Test implements Interf {
    public Sample m1()
    {
        return new Sample();
    }
    //Constructor Reference
    Interf i = () -> new Sample();
    Interf i1 = Sample::new;

}

------------------------------------------------------------------------------

interface Interf
{
    public void m1();
}

public class Test {
    public void m2()
    {
        System.out.println("Method Reference");
    }

    public static void main(String[] args) {

        Interf i = () -> System.out.println("By Lambda Expression");
        i.m1();

        Test test = new Test();
        Interf i1 = test::m2;
        i1.m1();
    }
}