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Java ComboBox.
Java ComboBox is a part of Java Swing package. Java ComboBox inherits Java Component class . Java ComboBox shows a popup menu that shows a list and the user can select a option from that specified list . Java ComboBox can be editable or read- only depending on the choice of the programmer .
Constructor of the JComboBox are:
Java ComboBox() : creates a new empty Java ComboBox .
Java ComboBox(ComboBoxModel M) : creates a new Java ComboBox with items from specified ComboBoxModel
Java ComboBox(E [ ] i) : creates a new Java ComboBox with items from specified array.
Java ComboBox(Vector items) : creates a new Java ComboBox with items from the specified vector

ComboBox java
The object of Choice class is used to show popup menu of choices. Choice selected by user is shown on the top of a menu. It inherits JComponent class.
ComboBox in java class declaration

A component that combines a button or editable field and a drop-down list. The user can select a value from the drop-down list, which appears at the user's request. If you make the combo box in java editable, then the combo box includes an editable field into which the user can type a value.
Java GUI Tutorial Creating A Combo Box In Java GUI Using JComboBox Class

This video shows you how to add a combobox (a drop-down list) to a GUI, populate it with options and then get your program to recognise which option the user chose.

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