32 lines
674 B
Java
32 lines
674 B
Java
// functional/UnboundMethodReference.java
|
|
// (c)2016 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()
|
|
*/
|