Bug 91017

Description Matt McHenry 2005-04-11 12:39:00 EDT

This might be a duplicate of bug 84496, but I'm rather new to generics so I'm
not sure.  In the code snippet below, the indicated line generates the following
error when compiled with sun's javac:

cannot find symbol
 symbol  : method addAll(java.util.List<capture of ?>)
 location: interface java.util.List<capture of ?>
 untypedList.addAll(untypedList2);

But with eclipse's compiler (3.1M6), it is not flagged as an error.  And when
the code runs, it generates a ClassCastException.

----

import java.util.ArrayList;
import java.util.List;

public class Test_Lists {
	public static void main(String[] args) {
		List<String> stringList = new ArrayList<String>();
		stringList.add("foo");
		List<Integer> intList = new ArrayList<Integer>();
		intList.add(1);

		List<?> untypedList = stringList;
		List<?> untypedList2 = intList;

		//correctly flagged as error: untypedList.add(new Object());
		//ditto: untypedList.add(untypedList2.get(0));

		//but this is not flagged at all by eclipse:
		untypedList.addAll(untypedList2);

		for(String s : stringList){
			//next line generates runtime ClassCastException
			Logger.log("Test_Lists.main: s: " + s);
		}
	}
}