Lambda can only be used with functional interface?

Question

I did this:

public class LambdaConflict
{
    public static void main(String args[]){
        //*
        System.out.println(LambdaConflict.get(
                     


        

Answer 1

As stated by @Thomas-Uhrig, Functional Interfaces can only have one method.

A way to fix this, primarily because you never use public T get2(T arg1);, is to change the Intf interface to:

@FunctionalInterface
interface Intf
{
    public T get1(T arg1);
}