A DESCRIPTION OF THE REQUEST :
Many Swing classes can be fitted with generics. For instance:

JComboBoxModel<T> {
    T getSelectedItem();
    void setSelectedItem(T anItem);
}

JComboBox<T> {
    public JComboBox(T[] items);
    ComboBoxModel<T> getModel();
}

JUSTIFICATION :
It will allow reducing anonymous or other subclasses created to transport type information through a program. And also brings the obvious safety.

There are no known compatibility issues.