How to use

checkedSet

method

in

java.util.Collections

 @Override
 public Set<String> create(String[] elements) {
  Set<String> innerSet = new HashSet<>();
  Collections.addAll(innerSet, elements);
  return Collections.checkedSet(innerSet, String.class);
 }
})

classes.add(Collections.checkedNavigableSet(Collections.emptyNavigableSet(), Void.class).getClass());
classes.add(Collections.checkedQueue(new LinkedList<>(), Void.class).getClass());
classes.add(Collections.checkedSet(Collections.emptySet(), Void.class).getClass());
classes.add(Collections.checkedSortedMap(Collections.emptySortedMap(), Void.class, Void.class).getClass());
classes.add(Collections.checkedSortedSet(Collections.emptySortedSet(), Void.class).getClass());

checkedSet = Collections.checkedSet(es, Size.class);
checkedSortedSet = Collections.checkedSortedSet(ts, String.class);
checkedList = Collections.checkedList(ll, String.class);

@SuppressWarnings("unchecked")
public Set<Point> getElements() {
  //return (Set<Point>) super.elements;
  return Collections.checkedSet( (Set<Point>) super.elements, Point.class );
}

  @SuppressWarnings("unchecked")
  public Set<? extends Primitive> getElements() {
    return Collections.checkedSet( (Set<Primitive>) super.elements, Primitive.class );
  }
}

@Override
public Dollar.SetWrapper<T> checked(Class<T> requiredClass) {
  set = Collections.checkedSet(set, requiredClass);
  return this;
}

@SuppressWarnings("unchecked")
public Set<OrientableSurface> getElements() {
  //return (Set<OrientableSurface>) super.elements;
  return Collections.checkedSet( (Set<OrientableSurface>) super.elements, OrientableSurface.class );
      
}

@SuppressWarnings("unchecked")
public Set<OrientableCurve> getElements() {
  return (Set<OrientableCurve>)
    Collections.checkedSet( (Set<OrientableCurve>) elements, OrientableCurve.class ); 
}

public Set<PropertyChangeListener> getPropertyChangeListeners() {
  return Collections.checkedSet(listeners, PropertyChangeListener.class);
}

public static <T> Set<T> set(Class<T> c) {
  return Collections.checkedSet(new LinkedHashSet<>(), c);
}

public static <T> Set<T> set(Class<T> c) {
  return Collections.checkedSet(new LinkedHashSet<T>(), c);
}

public static <T> Set<T> set(Class<T> c) {
  return Collections.checkedSet(new HashSet<T>(), c);
}

public static <T> Set<T> set(Class<T> c) {
  return Collections.checkedSet(new LinkedHashSet<>(), c);
}

public static <T> Set<T> set(Class<T> c) {
  return Collections.checkedSet(new HashSet<T>(), c);
}

public static <T> Set<T> set(Class<T> c) {
  return Collections.checkedSet(new LinkedHashSet<>(), c);
}

 @Override
 public Set<String> create(String[] elements) {
  Set<String> innerSet = new HashSet<>();
  Collections.addAll(innerSet, elements);
  return Collections.checkedSet(innerSet, String.class);
 }
})

 @Override public Set<String> create(String[] elements) {
  Set<String> innerSet = new HashSet<String>();
  Collections.addAll(innerSet, elements);
  return Collections.checkedSet(innerSet, String.class);
 }
})

/**
Create a checked Set<String>, first verifying that all elements
are in fact String.
@param s the Set
@throws ClassCastException
 */
public static <T> Set<T> checkedSet(final Set<?> s, final Class<T> theClass)
{
  final Set<T> cs = checkSet(s, theClass);
  return Collections.checkedSet(cs, theClass);
}

/**
Create a checked Set<String>, first verifying that all elements
are in fact String.
@param s the Set
@throws ClassCastException
 */
public static <T> Set<T> checkedSet(final Set<?> s, final Class<T> theClass)
{
  final Set<T> cs = checkSet(s, theClass);
  return Collections.checkedSet(cs, theClass);
}

static ImmutableMap<ParcelDTO, DefaultParcel> contentsToMap(PDPModel pm,
  DefaultVehicle vehicle) {
 // this is ok since we actually check the type
 @SuppressWarnings({ "unchecked", "rawtypes" })
 final Set<DefaultParcel> ps = Collections.checkedSet(
   (Set) newLinkedHashSet(pm.getContents(vehicle)), DefaultParcel.class);
 return toMap(ps);
}