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Groups > comp.lang.java.programmer > #8613

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

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On Oct 6, 6:42 pm, Daniel Pitts <newsgroup.nos...@virtualinfinity.net>
wrote:
> On 10/6/11 2:07 PM, albert kao wrote:
>
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> > On Oct 6, 4:23 pm, Daniel Pitts<newsgroup.nos...@virtualinfinity.net>
> > wrote:
> >> 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 combined
> >>>> class.
> >>>> How to do that?
>
> >>> Have 'MyString' implement 'CharSequence' and use a 'Map<String,CharSequence>'?
>
> >> 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 EventListenerList();
> >>>>     private Set keySet = Collections.EMPTY_SET;
>
> >>> DO NOT USE RAW TYPES!
>
> >> Seconded.
>
> > Inside the MyComboBox constructor, is there a way to figure out
> > whether the type of value of the Map is String or MyString?
>
> Not really, due to type erasure.  It might be helpful if you explain
> *why* you need the two constructors. What do they do differently?
>
//Two slightly different types of data stored in java.util.Map.
Map<String, String> map1 = getdata("data1");
Map<String, MyString> map2 = getdata2("data2");

// Use two slightly different ComboBoxes to sort & display the two
types of data
MyComboBox box1 = new MyComboBox(map1);
MyComboBox2 box2 = new MyComboBox2(map2);

// Is there a way to use the same type of ComboBox to sort & display
the two types of data?
MyComboBoxNew box1 = new MyComboBoxNew(map1);
MyComboBoxNew box2 = new MyComboBoxNew(map2);

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Support Map<String, String> & Map<String, MyString> albert kao <albertkao3@gmail.com> - 2011-10-06 12:05 -0700
  Re: Support Map<String, String> & Map<String, MyString> Lew <lewbloch@gmail.com> - 2011-10-06 13:02 -0700
    Re: Support Map<String, String> & Map<String, MyString> Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-10-06 13:23 -0700
      Re: Support Map<String, String> & Map<String, MyString> albert kao <albertkao3@gmail.com> - 2011-10-06 14:07 -0700
        Re: Support Map<String, String> & Map<String, MyString> Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-10-06 15:42 -0700
          Re: Support Map<String, String> & Map<String, MyString> albert kao <albertkao3@gmail.com> - 2011-10-06 17:54 -0700
          Re: Support Map<String, String> & Map<String, MyString> albert kao <albertkao3@gmail.com> - 2011-10-06 18:09 -0700
    Re: Support Map<String, String> & Map<String, MyString> albert kao <albertkao3@gmail.com> - 2011-10-06 13:32 -0700
      Re: Support Map<String, String> & Map<String, MyString> Lew <lewbloch@gmail.com> - 2011-10-06 19:03 -0700
        Re: Support Map<String, String> & Map<String, MyString> albert kao <albertkao3@gmail.com> - 2011-10-06 20:33 -0700
  Re: Support Map<String, String> & Map<String, MyString> Roedy Green <see_website@mindprod.com.invalid> - 2011-10-07 02:41 -0700
    Re: Support Map<String, String> & Map<String, MyString> albert kao <albertkao3@gmail.com> - 2011-10-07 03:49 -0700
      Re: Support Map<String, String> & Map<String, MyString> Roedy Green <see_website@mindprod.com.invalid> - 2011-10-07 10:48 -0700

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