Bug 9304 new class wizard: incorrect terminology used
1. new class wizard 2. press Add.. in interfaces 3. the dialog you see has a title 'Extended Interfaces Selection' this is incorrect - it should be 'Implemented Interfaces Selection' (this bug was pointed out on the wsad newsgroup)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/TypePage.java
enclosingType= typeInCU;
				}
			} else {
				ICompilationUnit cu= (ICompilationUnit) JavaModelUtil.findElementOfKind(elem, IJavaElement.COMPILATION_UNIT);
				if (cu != null) {
					enclosingType= JavaModelUtil.findPrimaryType(cu);
				}
			}
			
			try {
				IType type= null;
				if (elem.getElementType() == IJavaElement.TYPE) {
					type= (IType)elem;
					if (type.exists()) {
						String superName= JavaModelUtil.getFullyQualifiedName(type);
						if (type.isInterface()) {
							initSuperinterfaces.add(superName);
						} else {
							initSuperclass= superName;
						}
					}
				}
			} catch (JavaModelException e) {
				JavaPlugin.log(e.getStatus());
				
			}
		}			
		setPackageFragment(pack, true);
		setEnclosingType(enclosingType, true);
		setEnclosingTypeSelection(false, true);