Groups > comp.lang.java.programmer > #8614

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

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From	Lew <lewbloch@gmail.com>
Newsgroups	comp.lang.java.programmer
Subject	Re: Support Map<String, String> & Map<String, MyString>
Date	Thu, 6 Oct 2011 19:03:23 -0700 (PDT)
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albert kao wrote:
> 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>'?
>>
>>> public class MyComboBox extends LangComboBox implements
>>> PropertyChangeListener {
>>>   protected EventListenerList listenerList = new EventListenerList();
>>>   private Set keySet = Collections.EMPTY_SET;
>>
>> DO NOT USE RAW TYPES!
> 
> 'MyString' do NOT implement 'CharSequence', so it cannot use a
> 'Map<String,CharSequence>'

I was suggesting that you change MyString.  Obviously it doesn't implement that interface now, which is why I suggesting making that change.  If it had already implemented 'CharSequence' you wouldn't be here asking your question.  True?

No worries, you can use the 'Map<String, ?>' trick suggested upthread.  Then you can use the same 'ComboBox' for either kind, assuming a suitable 'toString()' method for 'MyString'.  

DO NOT USE RAW TYPES!

Code to check the type at run time is usually, and in your case definitely a sign of incomplete design.  Make your structures type safe at the compiler-enforced level.

And have I mentioned that you should not use raw types?

DO NOT USE RAW TYPES!

-- 
Lew

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Thread

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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