OnJava8-Examples/generics/NeedCasting.java

// generics/NeedCasting.java
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();
  }
}