// functional/UnboundMethodReference.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// Method reference without an object

class X {

String f() { return "X::f()"; }

}

interface MakeString {

String make();

}

interface TransformX {

String transform(X x);

}

public class UnboundMethodReference {

public static void main(String[] args) {

// MakeString ms = X::f; // [1]

TransformX sp = X::f;

X x = new X();

System.out.println(sp.transform(x)); // [2]

System.out.println(x.f()); // Same effect

}

}

/* Output:

X::f()

X::f()

*/