how do I get a class constant for a List

I need to get the class constant for a List in java
like

String.class

but for
List<String>

how do I do this?

lfrohmanAsked:
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for_yanConnect With a Mentor Commented:
Small correction in the code above;
this one is actually working:

public class Miscellaneous {

  public  static ArrayList<String> ars;

    public static void main(String[] args) {


      

                             Class d = (new ArrayList<String>()).getClass();
                          System.out.println("for d: " + d.getName());
             Class d1 = ArrayList.class;
          System.out.println("for d1: " + d1.getName());
            Class d2 = String.class;
          System.out.println("for d2: " + d2.getName());

        try{
  Field field =Miscellaneous.class.getField("ars");
  Type genericFieldType = field.getGenericType();
            System.out.println("type: " + genericFieldType);
        }catch(Exception ex){
          ex.printStackTrace();  
        }

}
}

Open in new window


output::

for d: java.util.ArrayList
for d1: java.util.ArrayList
for d2: java.lang.String
type: java.util.ArrayList<java.lang.String>

Open in new window


0
 
for_yanCommented:

waht you mean by class constant for a List - can you elaborate?
0
 
lfrohmanAuthor Commented:
like

Class c = String.class;

I want

Class d = xxx.class

to give me the same thing as
Class d = (new ArrayList<String>()).getClass();

(except this would result in ArrayList<String>, not List<String>)
0
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for_yanCommented:

Sorry still don't understand.

    For this:
                 Class d = (new ArrayList<String>()).getClass();
                          System.out.println(d.getName());

   I got the output:

java.util.ArrayList

So it makes sense; what do you want to get?

0
 
for_yanCommented:


                             Class d = (new ArrayList<String>()).getClass();
                          System.out.println("for d: " + d.getName());
             Class d1 = ArrayList.class;
          System.out.println("for d1: " + d1.getName());
            Class d2 = String.class;
          System.out.println("for d2: " + d2.getName());

Open in new window


output:
for d: java.util.ArrayList
for d1: java.util.ArrayList
for d2: java.lang.String

Open in new window

0
 
for_yanCommented:
Maybe you want to return the type name for the generic type.

It can be done this way (see the last part of the code, and the last line of output):

public class Miscellaneous {

  public  static ArrayList<String> ars;

    public static void main(String[] args) {


      

                             Class d = (new ArrayList<String>()).getClass();
                          System.out.println("for d: " + d.getName());
             Class d1 = ArrayList.class;
          System.out.println("for d1: " + d1.getName());
            Class d2 = String.class;
          System.out.println("for d2: " + d2.getName());

        try{
  Field field =Miscellaneous.class.getField("ars1");
  Type genericFieldType = field.getGenericType();
            System.out.println("type: " + genericFieldType);
        }catch(Exception ex){
          ex.printStackTrace();  
        }

}
}

Open in new window


output:

for d: java.util.ArrayList
for d1: java.util.ArrayList
for d2: java.lang.String
type: java.util.ArrayList<java.lang.String>

Open in new window

0
 
lfrohmanAuthor Commented:
Never mind, I needed an array, not a list, and I can use
String[].class
0
 
lfrohmanAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for lfrohman's comment http:/Q_27308291.html#36539820

for the following reason:

xxx
0
 
lfrohmanAuthor Commented:
xxx
0
 
lfrohmanAuthor Commented:
xxx
0
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