Wildcard

```
public class Wildcard<Q>
extends Object
```
A qualifier wildcard, bounded above and below by PolyQuals.

Constructors
Constructor and Description
`Wildcard(PolyQual<Q> qual)`
`Wildcard(PolyQual<Q> lower, PolyQual<Q> upper)`
`Wildcard(Q groundQual)`
`Wildcard(Q groundLower, Q groundUpper)`

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Wildcard<Q>`	`combineWith(Wildcard<Q> other, CombiningOperation<Q> lowerOp, CombiningOperation<Q> upperOp)` Combine with another wildcard, using the provided `CombiningOperation`s for the upper and lower bounds.
`static <Q> Wildcard<Q>`	`empty()` Produce the empty wildcard.
`boolean`	`equals(Object o)`
`PolyQual<Q>`	`getLowerBound()` Get the lower bound of the wildcard, or `null` if this is the empty wildcard.
`PolyQual<Q>`	`getUpperBound()` Get the upper bound of the wildcard, or `null` if this is the empty wildcard.
`int`	`hashCode()`
`boolean`	`isEmpty()` Check if this is the empty wildcard.
`Wildcard<Q>`	`substitute(Map<String,Wildcard<Q>> substs)` Substitute wildcards for qualifier parameters.
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

public Wildcard(PolyQual<Q> lower,
                PolyQual<Q> upper)

public Wildcard(Q groundLower,
                Q groundUpper)

Class Wildcard<Q>