import java.util.*;

class Samp07 {
	public static void main(String[] args){
		List<String> ls = Arrays.asList(10, 20, 30);
		System.out.println(ls.getClass().getName());
		ls.set(0, "xyz");
		for(String s: ls){
			System.out.println(s);
		}
		ls.add("Hello!");
	}
}