Re: Support Map<String, String> & Map<String, MyString>

albert kao <>
Thu, 6 Oct 2011 14:07:48 -0700 (PDT)
On Oct 6, 4:23 pm, Daniel Pitts <>

On 10/6/11 1:02 PM, Lew wrote:> albert kao wrote:

The following programs work but I like to combine MyComboBox&
MyComboBox2 into one class so that both Map<String, String> &
Map<String, MyString> data types are supported in the single combin=


How to do that?

Have 'MyString' implement 'CharSequence' and use a 'Map<String,CharSequ=


Or, if you don't really care about the value type, use Map<String, ?> as
the parameter type.

public class MyComboBox {
    public MyComboBox(Map<String, ?> data) {...};


If you *do* care about the type, then make your ComboBox generic:

public class MyComboBox<V> {
    public MyComboBox(Map<String, V> data) {...};


public class MyComboBox extends LangComboBox implements
PropertyChangeListener {
   protected EventListenerList listenerList = new EventListenerL=


   private Set keySet = Collections.EMPTY_SET;



Inside the MyComboBox constructor, is there a way to figure out
whether the type of value of the Map is String or MyString?

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