ing the default cell editor in a JTable, if I click to edit a cell,
type in some characters, and then click in another cell, the newly
entered text is made part of the field.

If I use an editable JComboBox as a cell editor, click in the cell to
edit it, type some characters into the text field in the JComboBox, and
then click in another cell, the text entered into the JComboBox is not
made part of the field. Instead, you have to hit Enter after entering
the text, before clicking in another field. Of course, hitting Enter in
a regular text field moves you to the next row.

This inconsistency makes it difficult to use a JComboBox as a cell editor
with a set of canned values that are easy to enter into a field.

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More description from a duplicate bug:

A JComboBox using the DefaultCellEditor (in a JTable) shows the following
problems:

1. Pressing ESC while the drop down list is displayed removes the list
   but does not cancel the JTextField editor.

2. If you modify the value in the text field, the only way to accept
   the change is to press return. If you click on another cell in the table
   the change is lost.

Reproduced with Java 1.3.0-C on Solaris using TableExample4 in the Swing 1.1
examples (change the combobox to be editable).