The name is misleading. JComboBox does not let you select combinations of options, the way you can with a JList, just a single option. The combo-moniker comes from the fact it has a combination write in field and select from pre-existing choices.
To control how the new write-in field possibility is keyed, you can write a custom ComboBoxEditor based on BasicComboBoxEditor.
JComboBox uses setSelectedItem instead of select. getSelectedItem returns an Object you must cast to a String. The use of Objects for your choices allows more flexibility in rendering the choices.
Here is how to let the user select an enum in a GUI (Graphic User Interface) using JComboBox.
Here is how to use a JComboBox with simple Strings as the possible choices.
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