OnJava8-Examples/functional/CtorReference.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// functional/CtorReference.java

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

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

class Dog {

String name;

int age = -1; // For "unknown"

Dog() { name = "stray"; }

Dog(String nm) { name = nm; }

Dog(String nm, int yrs) { name = nm; age = yrs; }

}

interface MakeNoArgs {

Dog make();

}

interface Make1Arg {

Dog make(String nm);

}

interface Make2Args {

Dog make(String nm, int age);

}

public class CtorReference {

public static void main(String[] args) {

MakeNoArgs mna = Dog::new; // [1]

Make1Arg m1a = Dog::new; // [2]

Make2Args m2a = Dog::new; // [3]

Dog dn = mna.make();

Dog d1 = m1a.make("Comet");

Dog d2 = m2a.make("Ralph", 4);

}