import java.util.ArrayList; 
import java.util.Collection; 
import java.util.Collections; 
import java.util.stream.Collectors; 

public class TestCollectionUnmodifiable {
	static Collection<TestCollectionUnmodifiable> list = null; 

	public static void main(String[] args) { 
		Collections.unmodifiableList(list.stream().collect(Collectors.toCollection(ArrayList::new))); 
	} 
}