// generics/Manipulation.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// {WillNotCompile}

class Manipulator<T> {
 private T obj;
 Manipulator(T x) { obj = x; }
 // Error: cannot find symbol: method f():
 public void manipulate() { obj.f(); }
}

public class Manipulation {
 public static void main(String[] args) {
 HasF hf = new HasF();
 Manipulator<HasF> manipulator =
 new Manipulator<>(hf);
 manipulator.manipulate();
 }
}