public void addParent(JavaClass p, JavaClass c) {
private void addParent(JavaClass p, JavaClass c) {
	public void addParent(JavaClass p, JavaClass c) {		if (p == null)			return;		if (DEBUG_HIERARCHY)			System.out.println("adding " + c.getClassName() + " is a "					+ p.getClassName());		addClass(p);		addParents(p);		Set<JavaClass> children = immediateSubtypes.get(p);		children.add(c);	}