### Question:
EmptyConstructor implements EmptyTreeConstructor<E, MutableSettableStructuredNode<E>, LinkedTree<E>> { @Override public Class<? extends Tree> forClass() { return LinkedTree.class; }  @Override LinkedTree<E> build(); @Override Class<? extends Tree> forClass();  }### Answer:
@Test public void forClass() { final EmptyConstructor<String> constructor = new EmptyConstructor<>(); assertEquals(LinkedTree.class, constructor.forClass()); }