wild card

[santhosh.R gowda]

   
import java.util.*;
public class genricsdemo
{
	
	public static  void getList(List<?>list)
	{
		for(Object obj : list)
		System.out.println((String)obj);
		
	}
	public static void main(String args[])
	{
		List<String> list = new ArrayList<String>();
		list.add("san");
		list.add("madh");
		getList(list);
	}
} 

i had one doubt even if we drop <?> in getList method the code will compile and runs... so what is the use of using wildcard here..

[Seetharaman Venkatasamy]

santhosh.R gowda wrote: so what is the use of using wildcard here..

To avoid the Compiler Warning .

[Maneesh Godbole]

Recommended reading
http://java.sun.com/j2se/1.5.0/docs/guide/language/generics.html

[santhosh.R gowda]

to avoid compiler warning

hi maneesh as you have given the link to refer only genrics regarding topics are there. but thet have not given any wild card please send me the link regarding wild card

[Arka Guhathakurta]

If you want to learn about wild cards read this link. It will clear your doubt.

Note that <?> and <? extends Object> behaves similarly in nearly all scenarios. Also note that the add method of list is not compatible with these two.

[Maneesh Godbole]

santhosh.R gowda wrote:

to avoid compiler warning

hi maneesh as you have given the link to refer only genrics regarding topics are there. but thet have not given any wild card please send me the link regarding wild card

If you had bothered to scroll down to the end of the page you would have found the link to the Generics tutorial which does contain information regarding wild cards.

Your access to Google is blocked for some reason?
http://faq.javaranch.com/java/ShowSomeEffort
http://faq.javaranch.com/java/SearchFirst

[santhosh.R gowda]

not cleared regarding wildcards thanks for reply

[Campbell Ritchie]

Please explain: could you not find the wildcard section, or could you find it and not understand it?

It is worthwhile searching for "Angelika Langer Java Generics"; she has a very nice set of FAQ about generics.

[santhosh.R gowda]

thanks for all