OnJava8-Examples/generics/ClassTypeCapture.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// generics/ClassTypeCapture.java

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

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

class Building {}

class House extends Building {}

public class ClassTypeCapture<T> {

Class<T> kind;

public ClassTypeCapture(Class<T> kind) {

this.kind = kind;

}

public boolean f(Object arg) {

return kind.isInstance(arg);

}

public static void main(String[] args) {

ClassTypeCapture<Building> ctt1 =

new ClassTypeCapture<>(Building.class);

System.out.println(ctt1.f(new Building()));

System.out.println(ctt1.f(new House()));

ClassTypeCapture<House> ctt2 =

new ClassTypeCapture<>(House.class);

System.out.println(ctt2.f(new Building()));

System.out.println(ctt2.f(new House()));

}

/* Output:

true

false

true