// generics/NeedCasting.java
// (c)2021 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.
import java.io.*;
import java.util.*;

public class NeedCasting {
  @SuppressWarnings("unchecked")
  public void f(String[] args) throws Exception {
    ObjectInputStream in = new ObjectInputStream(
      new FileInputStream(args[0]));
    List<Widget> shapes = (List<Widget>)in.readObject();
  }
}