// generics/ErasureAndInheritance.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.

class GenericBase<T> {

private T element;

public void set(T arg) { element = arg; }

public T get() { return element; }

}

class Derived1<T> extends GenericBase<T> {}

class Derived2 extends GenericBase {} // No warning

// class Derived3 extends GenericBase<?> {}

// Strange error:

// unexpected type

// required: class or interface without bounds

public class ErasureAndInheritance {

@SuppressWarnings("unchecked")

public static void main(String[] args) {

Derived2 d2 = new Derived2();

Object obj = d2.get();

d2.set(obj); // Warning here!

}

}