package generics;

import java.util.*;

/**

* RUN:

* javac generics/ClassTypeCapture.java && java generics.ClassTypeCapture

* OUTPUT:

* true

* true

* false

* true

*/

// COMPILETIME ERROR !!!

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> ctt2 = new ClassTypeCapture<Building>(Building.class);

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

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

ClassTypeCapture<House> ctt3 = new ClassTypeCapture<House>(House.class);

System.out.println(ctt3.f(new Building()));

System.out.println(ctt3.f(new House()));

}

}

class Building {}

class House extends Building {}