If you create a customer with name 'A&B', then V3 service returns that customer object like below -
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<IntuitResponse xmlns="http://schema.intuit.com/finance/v3" time="2014-03-20T01:54:46.834-07:00">
<Customer domain="QBO" sparse="false">
<Id>10</Id>
<SyncToken>0</SyncToken>
<MetaData>
<CreateTime>2014-03-20T01:54:46-07:00</CreateTime>
<LastUpdatedTime>2014-03-20T01:54:47-07:00</LastUpdatedTime>
</MetaData>
<FullyQualifiedName>A&B</FullyQualifiedName>
<DisplayName>A&B</DisplayName>
<PrintOnCheckName>A&B</PrintOnCheckName>
<Active>true</Active>
<Taxable>true</Taxable>
<Job>false</Job>
<BillWithParent>false</BillWithParent>
<Balance>100.00</Balance>
<BalanceWithJobs>100.00</BalanceWithJobs>
<PreferredDeliveryMethod>Email</PreferredDeliveryMethod>
</Customer>
</IntuitResponse>
To retrieve this object by name, you need to use the following query
SELECT * FROM Customer WHERE DisplayName = 'A&B'
But it needs to be url encoded like following
SELECT+*+FROM+Customer+WHERE+DisplayName+%3D+%27A%26B%27
Java code to achieve this -
Customer customer = GenerateQuery.createQueryEntity(Customer.class);
String query = select($(customer)).where($(customer.getDisplayName()).eq("A&B")).generate();
// Query output - SELECT * FROM Customer WHERE DisplayName = 'A&B'
String encodedUrl = URLEncoder.encode(query, "UTF-8");
It works perfectly. (Devkit handles all these pretty well )
Hope this answers your qts.
Thanks