package generics;

import java.util.*;

/**

* RUN:

* javac generics/Manipulation.java && java generics.Manipulation

* OUTPUT:

*

*/

public class Manipulation {

public static void main(String[] args) {

HasF hf = new HasF();

Manipulator<HasF> manipulator = new Manipulator<HasF>(hf);

manipulator.manipulate();

}

}

class Manipulator<T> {

private T obj;

public Manipulator(T x) { obj = x; }

/**

* error: cannot find symbol

* public void manipulate() { obj.f(); }

* ^

* symbol: method f()

* location: variable obj of type T

* where T is a type-variable:

* T extends Object declared in class Manipulator

*/

public void manipulate() { obj.f(); }

}