How to Use Combo Boxes (The Java™ Tutorials > Creating a GUI …
https://docs.oracle.com/javase%2Ftutorial%2Fuiswing%2F%2F/components/combobox.html
WEBHow to Use Combo Boxes. A JComboBox, which lets the user choose one of several choices, can have two very different forms. The default form is the uneditable combo box, which features a button and a drop-down list of values. The second form, called the editable combo box, features a text field with a small button abutting it.
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