Generics Question

[Chandana Garlapati]

This question is from javabeat mock test.

My question is Non generic ref. type + Generic instant----> compiles without warning..
But why the above code compiles with warning???

 
 import java.util.*; 
class TestSamp1 { 
	public static void main(String [] args) { 
		Set vals = new TreeSet<String>(); 
		vals.add("one"); 
		vals.add("1"); 
		vals.add("two"); 
		System.out.println(vals); 
	} 
} 
  

[Marcin Kwiatkowski]

You're trying to add element to raw type. It doesn't matter that you've instantiated 'vals' with parametrized type as long as reference type is not parametrized.

[Chandana Garlapati]

got it..

Thanks Marcin Kwiatkowski