Store lambda function in variable?

Question

As we know, In java-8 we can store function/method in variable. by using following way.

    @FunctionalInterface
    public interface MyInterface {

      public string getValue(int val1, int val2);

    }


    public class MyClass {

    static String someFun(int val1, int val2) {
       return ""+(val1+val2)

    }

     static BiFunction<Integer, Integer, String> testParamFun = (a,b) -> ""+(a+b);

    public static void main(String[] args){

       MyInterface intr = MyClass::someFun;
       System.out.println(int.getValue(2,4)); // outpur will be "6" 

       /* i want this, but it give me compile time error? 
         I want to store that function in variable like i was doing in above case. */

   MyInterface inter = MyClass::testParamFun;
   System.out.println(inter.getValue(4,5)); // it gives me error.
   // then i tried this
   System.out.println(inter.apply(4,5)); // i got error again. 


    }

    }

My question is, how can I store BiDirection in variable type MyInterface

I'm not sure I understand your end goal here. Could you clarify a bit? — Tunaki
– Tunaki, Commented Sep 11, 2015 at 10:41
If you're going to post demonstration code, could it be working demonstration code? — khelwood
– khelwood, Commented Sep 11, 2015 at 10:43
Your code contains lots of spell mistakes. Maybe your problem disappears once you fix all these errors first? — Holger
– Holger, Commented Sep 11, 2015 at 11:51

assylias · Accepted Answer · 2015-09-11 10:45:51Z

5

You need to refer to the BiFunction's method:

MyInterface int_ = MyClass.testParamFun::apply;

answered Sep 11, 2015 at 10:45

assylias

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