Unless otherwise specified, passing a null argument to any method or constructor in this class will cause a {@link NullPointerException} to be thrown.
Constructs an instance of this class with the specified flags.paramf The set of format flags which contain an unknown flag if (f == null) throw new NullPointerException(); this.flags = f;
if (f == null) throw new NullPointerException(); this.flags = f;
Returns the set of flags which contains an unknown flag.returnThe flags return flags;
return flags;
return "Flags = " + flags;