@SuppressWarnings annotation is non-functional

[PurpleRabbit75]

public class Board{
@SuppressWarnings("all")
public ArrayList<ArrayList<Tile>> self;}

outputs

Note: /Board.java uses unchecked or unsafe operations.Note: Recompile with -Xlint:unchecked for details.[JAVALAB] Compilation successful.

Is there any way to suppress the "unchecked or unsafe operations" warning?
Thanks!