Demonstration of the power of java 8 lambdas with generics.

FunctionN.java

public interface FunctionN<T,R>   {
        R apply(T...t);
}

Main.java

public class Main  {
    public static void main(String args[]) {
        new Main().doPrintln() ;
    }

    void doPrintln() {
        FunctionN myFunc1 =  (params) -> {
            StringBuilder sb = new StringBuilder(params.length);
            for (Object s: params) {
                         sb.append(" " + s);
            }
            return "hello" + sb;
        };

       //prints "hello there"
       System.out.println(myFunc1.apply("there"));
       //prints "hello there now"
       System.out.println(myFunc1.apply("there", "now"));
    }
}