I'm aware of
When using multi-select, it's better to use a list than a combo box. As GUI metaphors go, people expect a combo box to be single select, whereas lists can be either.
the contents of the list are too huge to be displayed using a simple list
JList in a
JScrollPane. You can call setVisibleRowCount(int) on the
JList to specify how many rows at a time should be shown.