Creating a ComboBox 

 // A read-only combo box.
 String[] items = {"item1", "item2"};
 JComboBox readOnlyCB = new JComboBox(items);
 readOnlyCB.addActionListener(actionListener);
     
 // An editable combo box.
 JComboBox editableCB = new JComboBox(items);
 editableCB.setEditable(true);
 editableCB.addActionListener(actionListener);