@Override
	public int hashCode(Object obj) {
		if (obj == null) {
			return 0;
		}

		return obj.hashCode();
	}
{@inheritDoc}

<p>This implementation returns
{@code obj.}{@link Object#hashCode hashCode()}.</p>
runtime/Java/src/org/antlr/v4/runtime/misc/ObjectEqualityComparator.java