Java SE (Java Platform, Standard Edition)

How do I create a combo-box with items which have different display value and actual value ?
For eg. I want a combo-box which lists the name of the customers. And when an item is selected, it gives its actual value rather than its display value.

S.N. Customer Name
1234 - ABCDE
1235 - ABCDE

I want a combo-box which displays customer name but when selected I get the value like 1234 in this example.

How do I create such combo-box ?

Thanks