WSL2: Find and Delete Zone.Identifier files

@NotNull 

@NotNull is a variable level annotation used to specifies that that the variable must not be null

String name=null;  --> returns false

name=""; --> returns true

name=" "-> return true

is applicable for char, string, collections and arrays

@NotEmpty 

@NotEmpty is a variable level annotation used to specify that value must not be null and not be empty that means size must be greater than zero

is applicable for char, string, collections and arrays

@NotBlank

@NotBlank is variable level annotation applicable only for String where variable not to be null and length must be more  than zero.

	@NotNull	@NotEmpty	@NotBlank
Char	Yes	Yes	Yes
String	Yes	Yes	Yes
Collections	Yes	Yes	No
Arrays	Yes	Yes	No
Size > 0	May be empty	Yes	Yes
Empty	allowed	Not allowed	Not allowed

differnces between null and emtpy

String name=null; -> this is null

String name=""; -> not null but empty