public boolean hasContact(ResidueNumber resNumber1, ResidueNumber resNumber2) {
		return contacts.containsKey(new Pair<ResidueNumber>(resNumber1, resNumber2));
	}
public boolean hasContact ( ResidueNumber resNumber1 , ResidueNumber resNumber2 ) { return contacts . containsKey ( new Pair < ResidueNumber > ( resNumber1 , resNumber2 ) ) ; }
Tell whether the given pair is a contact in this GroupContactSet,
the comparison is done by matching residue numbers and chain identifiers
@param resNumber1
@param resNumber2
@return