How to get the WorkItems from a Project Area based on their type ?

I am trying to get all the work items which have their type as defect from a particular project area. But I'm only able to get all the work items irrespective of their type from a particular project area. Can any one please tell me how to add the type criteria and get the work items which are of type defect. Below is the code which I am working on.

Thanks.

String repoUri = "****************";
        final String userId = "****************";
        final String password = "******************";
        List<IWorkItem> defectWorkitems=new ArrayList<IWorkItem>();
        TeamPlatform.startup();
        try {
            // Login to the repository using the provided credentials
            ITeamRepository repo = TeamPlatform.getTeamRepositoryService().getTeamRepository(repoUri);
            repo.registerLoginHandler(new ILoginHandler2() {
                @Override
                public ILoginInfo2 challenge(ITeamRepository arg0) {
                    return new UsernameAndPasswordLoginInfo(userId, password);
                }
            });
            repo.login(new SysoutProgressMonitor());
            IProcessItemService connect = (IProcessItemService) repo.getClientLibrary(IProcessItemService.class);
            List<IProjectArea> p = connect.findAllProjectAreas(null, new SysoutProgressMonitor());
            System.out.println("Project Areas :");
            for(IProjectArea projectArea: p){
                System.out.println(projectArea.getName());
                if(projectArea.getName().equals("********************")){
                    System.out.println("here");
                    IAuditableClient auditableClient = (IAuditableClient) repo.getClientLibrary(IAuditableClient.class);
                    IQueryClient queryClient = (IQueryClient) repo.getClientLibrary(IQueryClient.class);
                    IQueryableAttribute attribute = QueryableAttributes.getFactory(IWorkItem.ITEM_TYPE).findAttribute(projectArea, IWorkItem.PROJECT_AREA_PROPERTY, auditableClient, null);
                    Expression expression = new AttributeExpression(attribute, AttributeOperation.EQUALS, projectArea);
                    IQueryResult<IResolvedResult<IWorkItem>> results = queryClient.getResolvedExpressionResults(projectArea, expression, IWorkItem.FULL_PROFILE);
                    while(results.hasNext(new SysoutProgressMonitor())){
                        IResolvedResult<IWorkItem> result = results.next(new SysoutProgressMonitor());
                        IWorkItem workItem = (IWorkItem) result.getItem();
                        System.out.println(workItem.getItemId());
                        if(workItem.getItemType().toString()=="Enhancement"){
                            System.out.println("here");
                            defectWorkitems.add(workItem);
                        }
                    }
                }         
             }
            System.out.println(defectWorkitems.size());
       } finally {
            TeamPlatform.shutdown();
        }
    }