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

From:

Lew <lewbloch@gmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 6 Oct 2011 19:03:23 -0700 (PDT)

Message-ID:

<15595172.247.1317953003571.JavaMail.geo-discussion-forums@prni6>

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,CharSeque=

nce>'?

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 ha=
d already implemented 'CharSequence' you wouldn't be here asking your quest=
ion. True?

No worries, you can use the 'Map<String, ?>' trick suggested upthread. The=
n you can use the same 'ComboBox' for either kind, assuming a suitable 'toS=
tring()' 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 compile=
r-enforced level.

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

DO NOT USE RAW TYPES!

--
Lew