33 lines
789 B
Java
33 lines
789 B
Java
// functional/UnboundMethodReference.java
|
|
// ©2016 MindView LLC: see Copyright.txt
|
|
// We make no guarantees that this code is fit for any purpose.
|
|
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
|
|
// Method reference without an object.
|
|
import java.util.*;
|
|
import java.util.function.*;
|
|
|
|
class X {
|
|
String f() { return "X.f()"; }
|
|
}
|
|
|
|
public class UnboundMethodReference {
|
|
public static void main(String[] args) {
|
|
Function<String, Integer> len = String::length;
|
|
System.out.println(len.apply("UnboundMethodReference"));
|
|
|
|
List<String> words =
|
|
Arrays.asList("Rain", "Spain", "Plain");
|
|
words.forEach(System.out::println);
|
|
|
|
Function<X, String> xfr = X::f;
|
|
System.out.println(xfr.apply(new X()));
|
|
}
|
|
}
|
|
/* Output:
|
|
22
|
|
Rain
|
|
Spain
|
|
Plain
|
|
X.f()
|
|
*/
|