NetBeans: warning: [unchecked] unchecked call to setModel(ComboBoxModel) as a member of the raw type

After building a project in NetBeans, the following messages are displayed in the Output area:

warning: [unchecked] unchecked call to setModel(ComboBoxModel<E>) as a member of the raw type JComboBox
        this.typeCombo.setModel(new DefaultComboBoxModel(type));
where E is a type-variable:
      E extends Object declared in class JComboBox

This is because, since Java 7, JComoBox has a generic type for its components.

If you are displaying String in the combo box, you may declare it as below.

       JComboBox<String> = new JComboBox<>();

If you dragged the Combo Box from the Palette to the Design area in NetBeans to build your display, click on the combo box in Design. In general, the Properties will display at the right of the screen. Select the Code tab, and enter <String> in Type Parameters.

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